Liberty Property Limited Partnership 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Document Information [Line Items]
Entity Registrant Name	LIBERTY PROPERTY TRUST
Entity Central Index Key	921112
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		148,893,177
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$5.50
Liberty Property Limited Partnership [Member]
Document Information [Line Items]
Entity Registrant Name	LIBERTY PROPERTY LIMITED PARTNERSHIP
Entity Central Index Key	921113

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Land and land improvements	$1,189,760,000	$1,137,897,000
Building and improvements	5,343,908,000	5,129,702,000
Less accumulated depreciation	-1,182,569,000	-1,051,593,000
Operating real estate	5,351,099,000	5,216,006,000
Development in progress	277,411,000	209,187,000
Land held for development	269,059,000	233,055,000
Net real estate	5,897,569,000	5,658,248,000
Cash and cash equivalents	69,346,000	163,414,000
Restricted cash	20,325,000	51,456,000
Accounts receivable	15,481,000	13,900,000
Deferred rent receivable	107,909,000	99,797,000
Deferred financing and leasing costs, net	206,286,000	226,067,000
Investments in and advances to unconsolidated joint ventures	208,832,000	179,655,000
Assets held for sale	8,389,000	287,183,000
Prepaid expenses and other assets	91,399,000	95,840,000
Total assets	6,625,536,000	6,775,560,000
LIABILITIES
Mortgage Loans	487,301,000	545,306,000
Unsecured notes	2,509,094,000	2,708,213,000
Credit facility	167,000,000	0
Accounts payable	52,043,000	70,406,000
Accrued interest	24,513,000	25,777,000
Dividend and distributions payable	72,253,000	71,323,000
Other liabilities	219,418,000	250,819,000
Total liabilities	3,531,622,000	3,671,844,000
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of December 31, 2014 and December 31, 2013	7,537,000	7,537,000
EQUITY
Common shares of beneficial interest, $.001 par value, 283,987,000 shares authorized; 149,807,179 (includes 1,249,909 in treasury) and 147,846,801 (includes 1,249,909 in treasury) shares issued and outstanding as of December 31, 2014 and December 31, 2013, respectively	150,000	148,000
Additional paid-in capital	3,740,594,000	3,669,618,000
Accumulated other comprehensive (loss) income	-6,252,000	9,742,000
Distributions in excess of net income	-654,869,000	-591,713,000
Common shares in treasury, at cost, 1,249,909 shares as of December 31, 2014 and 2013	-51,951,000	-51,951,000
Total Liberty Property Trust shareholders' equity	3,027,672,000	3,035,844,000
Noncontrolling interest - operating partnership
Noncontrolling interest - operating partnerships	54,786,000	56,713,000
Noncontrolling interest - consolidated joint ventures	3,919,000	3,622,000
Total equity	3,086,377,000	3,096,179,000
Total liabilities, noncontrolling interest - operating partnership and equity	6,625,536,000	6,775,560,000
Liberty Property Limited Partnership [Member]
ASSETS
Land and land improvements	1,189,760,000	1,137,897,000
Building and improvements	5,343,908,000	5,129,702,000
Less accumulated depreciation	-1,182,569,000	-1,051,593,000
Operating real estate	5,351,099,000	5,216,006,000
Development in progress	277,411,000	209,187,000
Land held for development	269,059,000	233,055,000
Net real estate	5,897,569,000	5,658,248,000
Cash and cash equivalents	69,346,000	163,414,000
Restricted cash	20,325,000	51,456,000
Accounts receivable	15,481,000	13,900,000
Deferred rent receivable	107,909,000	99,797,000
Deferred financing and leasing costs, net	206,286,000	226,067,000
Investments in and advances to unconsolidated joint ventures	208,832,000	179,655,000
Assets held for sale	8,389,000	287,183,000
Prepaid expenses and other assets	91,399,000	95,840,000
Total assets	6,625,536,000	6,775,560,000
LIABILITIES
Mortgage Loans	487,301,000	545,306,000
Unsecured notes	2,509,094,000	2,708,213,000
Credit facility	167,000,000	0
Accounts payable	52,043,000	70,406,000
Accrued interest	24,513,000	25,777,000
Dividend and distributions payable	72,253,000	71,323,000
Other liabilities	219,418,000	250,819,000
Total liabilities	3,531,622,000	3,671,844,000
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of December 31, 2014 and December 31, 2013	7,537,000	7,537,000
EQUITY
General partner’s equity	3,027,672,000	3,035,844,000
Limited partners’ equity	54,786,000	56,713,000
Noncontrolling interest - operating partnership
Noncontrolling interest - consolidated joint ventures	3,919,000	3,622,000
Total equity	3,086,377,000	3,096,179,000
Total liabilities, noncontrolling interest - operating partnership and equity	$6,625,536,000	$6,775,560,000

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING REVENUE
Rental	$568,346,000	$458,081,000	$396,418,000
Operating expense reimbursement	224,285,000	187,849,000	163,861,000
Operating revenue	792,631,000	645,930,000	560,279,000
OPERATING EXPENSE
Rental property	138,124,000	114,617,000	104,431,000
Real estate taxes	101,814,000	79,918,000	65,697,000
General and administrative	63,327,000	74,564,000	64,686,000
Depreciation and amortization	231,943,000	173,784,000	135,523,000
Total operating expenses	535,208,000	442,883,000	370,337,000
Operating income	257,423,000	203,047,000	189,942,000
OTHER INCOME (EXPENSE)
Other Income	17,669,000	18,555,000	11,825,000
Interest expense	-151,887,000	-127,115,000	-103,363,000
Total other income (expense)	-134,218,000	-108,560,000	-91,538,000
Income before gain on property dispositions, income taxes and equity in earnings (loss) of unconsolidated joint ventures	123,205,000	94,487,000	98,404,000
Gain on property dispositions	45,030,000	0	0
Income taxes	-2,967,000	-2,799,000	-976,000
Equity in earnings (loss) of unconsolidated joint ventures	10,314,000	6,067,000	-681,000
Income from continuing operations	175,582,000	97,755,000	96,747,000
Discontinued operations (including net gain on property dispositions of $46,631, $95,384 and $12,426 for the years ended December 31, 2014, 2013 and 2012, respectively)	48,581,000	121,839,000	51,004,000
Net income	224,163,000	219,594,000	147,751,000
Noncontrolling interest - operating partnership	-5,706,000	-9,203,000	-10,590,000
Noncontrolling interest - consolidated joint ventures	-547,000	-653,000	275,000
Excess of preferred unit carrying amount over redemption			3,689,000
Excess of preferred unit carrying amount over redemption		-1,236,000
Net income available to common shareholders	217,910,000	209,738,000	137,436,000
Comprehensive income attributable to common shareholders
Net income	224,163,000	219,594,000	147,751,000
Other comprehensive (loss) income - foreign currency translation	-14,415,000	5,397,000	3,436,000
Other comprehensive income - change in net unrealized (loss) gain on derivative instruments	-1,961,000	1,584,000	0
Other comprehensive (loss) income	-16,376,000	6,981,000	3,436,000
Total comprehensive income	207,787,000	226,575,000	151,187,000
Less: comprehensive income attributable to noncontrolling interest	-5,870,000	-9,995,000	-10,422,000
Comprehensive income attributable to common shareholders	201,917,000	216,580,000	140,765,000
Weighted average number of common shares outstanding
Basic	147,216	130,180	116,863
Diluted	147,886	130,909	117,694
Amounts attributable to common shareholders
Income from continuing operations	170,471,000	91,274,000	88,008,000
Discontinued operations	47,439,000	118,464,000	49,428,000
Net income available to common shareholders	217,910,000	209,738,000	137,436,000
Liberty Property Limited Partnership [Member]
OPERATING REVENUE
Rental	568,346,000	458,081,000	396,418,000
Operating expense reimbursement	224,285,000	187,849,000	163,861,000
Operating revenue	792,631,000	645,930,000	560,279,000
OPERATING EXPENSE
Rental property	138,124,000	114,617,000	104,431,000
Real estate taxes	101,814,000	79,918,000	65,697,000
General and administrative	63,327,000	74,564,000	64,686,000
Depreciation and amortization	231,943,000	173,784,000	135,523,000
Total operating expenses	535,208,000	442,883,000	370,337,000
Operating income	257,423,000	203,047,000	189,942,000
OTHER INCOME (EXPENSE)
Other Income	17,669,000	18,555,000	11,825,000
Interest expense	-151,887,000	-127,115,000	-103,363,000
Total other income (expense)	-134,218,000	-108,560,000	-91,538,000
Income before gain on property dispositions, income taxes and equity in earnings (loss) of unconsolidated joint ventures	123,205,000	94,487,000	98,404,000
Gain on property dispositions	45,030,000	0	0
Income taxes	-2,967,000	-2,799,000	-976,000
Equity in earnings (loss) of unconsolidated joint ventures	10,314,000	6,067,000	-681,000
Income from continuing operations	175,582,000	97,755,000	96,747,000
Discontinued operations (including net gain on property dispositions of $46,631, $95,384 and $12,426 for the years ended December 31, 2014, 2013 and 2012, respectively)	48,581,000	121,839,000	51,004,000
Net income	224,163,000	219,594,000	147,751,000
Noncontrolling interest - consolidated joint ventures	-547,000	-653,000	275,000
Preferred unit distributions	-472,000	-2,119,000	-9,902,000
Excess of preferred unit carrying amount over redemption	0		3,689,000
Excess of preferred unit carrying amount over redemption	0	-1,236,000
Net income available to common shareholders	223,144,000	215,586,000	141,813,000
Comprehensive income attributable to common shareholders
Net income	224,163,000	219,594,000	147,751,000
Other comprehensive (loss) income - foreign currency translation	-14,415,000	5,397,000	3,436,000
Other comprehensive income - change in net unrealized (loss) gain on derivative instruments	-1,961,000	1,584,000	0
Other comprehensive (loss) income	-16,376,000	6,981,000	3,436,000
Total comprehensive income	207,787,000	226,575,000	151,187,000
Weighted average number of common shares outstanding
Basic	150,770	133,858	120,623
Diluted	151,440	134,587	121,454
Net Income Allocated to General Partners	217,910,000	209,738,000	137,436,000
Net Income Allocated to Limited Partners	5,706,000	9,203,000	10,590,000
Amounts attributable to common shareholders
Income from continuing operations	175,035,000	97,102,000	97,022,000
Net income available to common shareholders	$223,144,000	$215,586,000	$141,813,000
Common shares [Member]
Basic:
Income from continuing operations	$1.16	$0.70	$0.75
Income from discontinued operations	$0.32	$0.91	$0.43
Income per common share - basic	$1.48	$1.61	$1.18
Diluted:
Income from continuing operations	$1.15	$0.70	$0.75
Income from discontinued operations	$0.32	$0.90	$0.42
Income per common share - diluted	$1.47	$1.60	$1.17
Common Units [Member] | Liberty Property Limited Partnership [Member]
Basic:
Income from continuing operations	$1.16	$0.70	$0.75
Income from discontinued operations	$0.32	$0.91	$0.43
Income per common share - basic	$1.48	$1.61	$1.18
Diluted:
Income from continuing operations	$1.15	$0.70	$0.75
Income from discontinued operations	$0.32	$0.90	$0.42
Income per common share - diluted	$1.47	$1.60	$1.17

Consolidated_Statement_of_Equi

Consolidated Statement of Equity (USD $)	Total	Common Shares Of Beneficial Interest [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Distributions in Excess of Net Income [Member]	Common Shares Held in Treasury [Member]	Total Liberty Property Trust Shareholders' Equity [Member]	Noncontrolling interest operating partnership-Common [Member]	Noncontrolling interest operating partnership-Preferred [Member]	Noncontrolling interest-consolidated joint ventures [Member]	Stockholders' Equity, Total [Member]	Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]	Common shares [Member]	Common Units [Member]	Common Units [Member]
	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	General Partners Equity [Member]	Noncontrolling interest operating partnership-Common [Member]	Noncontrolling interest operating partnership-Preferred [Member]	Noncontrolling interest-consolidated joint ventures [Member]	Stockholders' Equity, Total [Member]		Liberty Property Limited Partnership [Member]	Liberty Property Limited Partnership [Member]
													USD ($)	USD ($)	USD ($)	USD ($)	USD ($)		General Partner [Member]	Limited Partner [Member]
Beginning Balance at Dec. 31, 2011		$117,000	$2,617,355,000	($429,000)	($461,498,000)	($51,951,000)	$2,103,594,000	$64,428,000	$287,959,000	$3,775,000	$2,459,756,000		$2,103,594,000	$64,428,000	$287,959,000	$3,775,000	$2,459,756,000
Noncontrolling interest - operating partnership (mezzanine) - Beginning of Period at Dec. 31, 2011	7,537,000											7,537,000
Common shares outstanding - Beginning Balance at Dec. 31, 2011																		117,352,353
General Partner's units outstanding - Beginning Balance at Dec. 31, 2011																			116,102,444
Limited Partners' units outstanding - Beginning Balance at Dec. 31, 2011																				3,808,746
Contributions from partners													68,767,000				68,767,000
Distributions to partners													-223,695,000	-7,109,000	-9,430,000	-179,000	-240,413,000
Net proceeds from the issuance of common shares		2,000	58,708,000	0	0	0	58,710,000	0	0	0	58,710,000
Net income	147,751,000	0	0	0	137,436,000	0	137,436,000	4,378,000	5,740,000	-275,000	147,279,000	147,751,000	137,436,000	4,378,000	5,740,000	-275,000	147,279,000
Redemption of limited partners common units for common shares													1,581,000	-1,581,000
Distributions		0	0	0	-223,695,000	0	-223,695,000	-7,109,000	-9,430,000	-179,000	-240,413,000
Noncash compensation		0	10,057,000	0	0	0	10,057,000	0	0	0	10,057,000
Foreign currency translation adjustment	3,436,000	0	0	3,329,000	0	0	3,329,000	107,000	0	0	3,436,000	3,436,000	3,329,000	107,000			3,436,000
Other comprehensive income - change in net unrealized (loss) gain on derivatives	0											0
Partners' Capital, Other												0	0	0	0		0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Common Units		0	1,581,000	0	0	0	1,581,000	-1,581,000	0	0	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Preferred Units		0	0	0	0	0	0	0	-224,694,000	0	-224,694,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests															-224,694,000		-224,694,000
Excess of preferred unit carrying amount over redemption	3,689,000	0	0	0	0	0	0	0	3,689,000	0	3,689,000	3,689,000			3,689,000		3,689,000
Number of common shares issued																		2,273,528
Number of common units issued																			2,273,528
Number of common units converted																		94,895	94,895	94,895
Temporary Equity, Net Income	472,000											472,000
Temporary Equity, Distributions	-472,000											-472,000
Ending Balance at Dec. 31, 2012		119,000	2,687,701,000	2,900,000	-547,757,000	-51,951,000	2,091,012,000	60,223,000	63,264,000	3,321,000	2,217,820,000		2,091,012,000	60,223,000	63,264,000	3,321,000	2,217,820,000
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2012	7,537,000											7,537,000
Common shares outstanding - Ending Balance at Dec. 31, 2012																		119,720,776
General Partner's units outstanding - Ending Balance at Dec. 31, 2012																			118,470,867
Limited Partners' units outstanding - Ending Balance at Dec. 31, 2012																				3,713,851
Contributions from partners													979,444,000				979,444,000
Distributions to partners													-253,694,000	-6,995,000	-1,647,000	-352,000	-262,688,000
Net proceeds from the issuance of common shares		29,000	969,439,000	0	0	0	969,468,000	0	0	0	969,468,000
Net income	219,594,000	0	0	0	209,738,000	0	209,738,000	5,848,000	2,883,000	653,000	219,122,000	219,594,000	209,738,000	5,848,000	2,883,000	653,000	219,122,000
Redemption of limited partners common units for common shares													2,502,000	-2,502,000
Distributions		0	0	0	-253,694,000	0	-253,694,000	-6,995,000	-1,647,000	-352,000	-262,688,000
Noncash compensation		0	9,976,000	0	0	0	9,976,000	0	0	0	9,976,000
Foreign currency translation adjustment	5,397,000	0	0	5,296,000	0	0	5,296,000	101,000	0	0	5,397,000	5,397,000	5,296,000	101,000			5,397,000
Other comprehensive income - change in net unrealized gain on derivatives	1,584,000												1,546,000	38,000	0	0	1,584,000
Other comprehensive income - change in net unrealized (loss) gain on derivatives	1,584,000	0	0	1,546,000	0	0	1,546,000	38,000	0	0	1,584,000	1,584,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Common Units		0	2,502,000	0	0	0	2,502,000	-2,502,000	0	0	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Preferred Units		0	0	0	0	0	0	0	-63,264,000	0	-63,264,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests															-63,264,000		-63,264,000
Excess of preferred unit carrying amount over redemption	-1,236,000	0	0	0	0	0	0	0	-1,236,000	0	-1,236,000	-1,236,000			-1,236,000		-1,236,000
Number of common shares issued																		27,968,740
Number of common units issued																			27,968,740
Number of common units converted																		157,285	157,285	157,285
Temporary Equity, Net Income	472,000											472,000
Temporary Equity, Distributions	-472,000											-472,000
Ending Balance at Dec. 31, 2013	3,096,179,000	148,000	3,669,618,000	9,742,000	-591,713,000	-51,951,000	3,035,844,000	56,713,000	0	3,622,000	3,096,179,000	3,096,179,000	3,035,844,000	56,713,000	0	3,622,000	3,096,179,000
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2013	7,537,000											7,537,000
Common shares outstanding - Ending Balance at Dec. 31, 2013	147,846,801											146,596,892						147,846,801
General Partner's units outstanding - Ending Balance at Dec. 31, 2013																			146,596,892
Limited Partners' units outstanding - Ending Balance at Dec. 31, 2013												3,556,566								3,556,566
Contributions from partners													70,930,000				70,930,000
Distributions to partners													-281,066,000	-6,731,000	0	-250,000	-288,047,000
Net proceeds from the issuance of common shares		2,000	58,471,000	0	0	0	58,473,000	0	0	0	58,473,000
Net income	224,163,000	0	0	0	217,910,000	0	217,910,000	5,234,000	0	547,000	223,691,000	224,163,000	217,910,000	5,234,000	0	547,000	223,691,000
Redemption of limited partners common units for common shares													48,000	-48,000			0
Distributions		0	0	0	-281,066,000	0	-281,066,000	-6,731,000	0	-250,000	-288,047,000
Noncash compensation		0	12,457,000	0	0	0	12,457,000	0	0	0	12,457,000
Foreign currency translation adjustment	-14,415,000	0	0	-14,079,000	0	0	-14,079,000	-336,000	0	0	-14,415,000	-14,415,000	-14,079,000	-336,000			-14,415,000
Other comprehensive income - change in net unrealized gain on derivatives	-3,419,000	0											-1,915,000	-46,000	0	0	-1,961,000
Other comprehensive income - change in net unrealized (loss) gain on derivatives	-1,961,000		0	-1,915,000	0	0	-1,915,000	-46,000	0	0	-1,961,000	-1,961,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Common Units		0	48,000	0	0	0	48,000	-48,000	0	0	0
Excess of preferred unit carrying amount over redemption												0
Excess of preferred unit carrying amount over redemption												0
Number of common shares issued																		1,957,378
Number of common units issued																			1,957,378
Number of common units converted																		3,000	3,000	3,000
Temporary Equity, Net Income	472,000											472,000
Temporary Equity, Distributions	-472,000											-472,000
Ending Balance at Dec. 31, 2014	3,086,377,000	150,000	3,740,594,000	-6,252,000	-654,869,000	-51,951,000	3,027,672,000	54,786,000	0	3,919,000	3,086,377,000	3,086,377,000	3,027,672,000	54,786,000	0	3,919,000	3,086,377,000
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2014	$7,537,000											$7,537,000
Common shares outstanding - Ending Balance at Dec. 31, 2014	149,807,179											148,557,270						149,807,179
General Partner's units outstanding - Ending Balance at Dec. 31, 2014																			148,557,270
Limited Partners' units outstanding - Ending Balance at Dec. 31, 2014												3,553,566								3,553,566

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$224,163	$219,594	$147,751
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236,075	205,147	167,421
Amortization of deferred financing costs	4,811	4,084	4,858
Equity in (earnings) loss of unconsolidated joint ventures	-10,314	-6,067	681
Distributions from unconsolidated joint ventures	0	844	624
Gain on property dispositions	-91,661	-98,403	-12,426
Share-based and Noncash compensation	12,457	9,976	10,057
Other	-7,935	-8,311	-3,256
Changes in operating assets and liabilities:
Restricted cash	30,286	-18,397	30,713
Accounts receivable	-1,770	-4,889	-799
Deferred rent receivable	-15,263	-9,473	-6,363
Prepaid expenses and other assets	-28,360	-22,424	-10,871
Accounts payable	5,299	15,703	7,641
Accrued interest	-1,264	5,613	-3,983
Other liabilities	-20,040	22,968	-14,882
Net cash provided by operating activities	336,484	315,965	317,166
INVESTING ACTIVITIES
Investment in properties - acquisitions	-124,962	-1,429,822	-211,894
Investment in properties - other	-102,466	-74,345	-49,682
Investments in and advances to unconsolidated joint ventures	-22,243	-16,185	-1,461
Distributions from unconsolidated joint ventures	15,330	13,774	6,009
Net proceeds from disposition of properties/land	559,322	526,949	234,686
Net proceeds from (advances on) public reimbursement receivable/escrow	2,504	9,821	-986
Investment in development in progress	-288,375	-123,879	-199,384
Investment in land held for development	-105,324	-67,326	-67,513
Payment of deferred leasing costs	-40,123	-36,901	-22,444
Net cash used in investing activities	-106,337	-1,197,914	-312,669
FINANCING ACTIVITIES
Net proceeds from issuance of Common Shares	58,473	969,468	58,710
Redemption of preferred units	0	-64,500	-221,000
Proceeds from unsecured notes	0	448,646	700,000
Repayments of unsecured notes	-200,000	0	-230,100
Proceeds from mortgage loans	0	10,401	34,599
Repayments of mortgage loans	-56,156	-10,605	-35,099
Proceeds from credit facility	517,550	611,550	839,250
Repayments on credit facility	-350,550	-703,550	-886,650
Payment of deferred financing costs	-3,629	-5,866	-7,206
Distribution paid on Common Shares	-280,136	-240,340	-222,573
Distribution paid on units	-7,453	-9,438	-17,241
Net cash (used in) provided by financing activities	-321,901	1,005,766	12,690
Net (decrease) increase in cash and cash equivalents	-91,754	123,817	17,187
(Decrease) increase in cash and cash equivalents related to foreign currency translation	-2,314	1,241	2,965
Cash and cash equivalents at beginning of year	163,414	38,356	18,204
Cash and cash equivalents at end of year	69,346	163,414	38,356
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	224,163	219,594	147,751
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236,075	205,147	167,421
Amortization of deferred financing costs	4,811	4,084	4,858
Equity in (earnings) loss of unconsolidated joint ventures	-10,314	-6,067	681
Distributions from unconsolidated joint ventures	0	844	624
Gain on property dispositions	-91,661	-98,403	-12,426
Share-based and Noncash compensation	12,457	9,976	10,057
Other	-7,935	-8,311	-3,256
Changes in operating assets and liabilities:
Restricted cash	30,286	-18,397	30,713
Accounts receivable	-1,770	-4,889	-799
Deferred rent receivable	-15,263	-9,473	-6,363
Prepaid expenses and other assets	-28,360	-22,424	-10,871
Accounts payable	5,299	15,703	7,641
Accrued interest	-1,264	5,613	-3,983
Other liabilities	-20,040	22,968	-14,882
Net cash provided by operating activities	336,484	315,965	317,166
INVESTING ACTIVITIES
Investment in properties - acquisitions	-124,962	-1,429,822	-211,894
Investment in properties - other	-102,466	-74,345	-49,682
Investments in and advances to unconsolidated joint ventures	-22,243	-16,185	-1,461
Distributions from unconsolidated joint ventures	15,330	13,774	6,009
Net proceeds from disposition of properties/land	559,322	526,949	234,686
Net proceeds from (advances on) public reimbursement receivable/escrow	2,504	9,821	-986
Investment in development in progress	-288,375	-123,879	-199,384
Investment in land held for development	-105,324	-67,326	-67,513
Payment of deferred leasing costs	-40,123	-36,901	-22,444
Net cash used in investing activities	-106,337	-1,197,914	-312,669
FINANCING ACTIVITIES
Redemption of preferred units	0	-64,500	-221,000
Proceeds from unsecured notes	0	448,646	700,000
Repayments of unsecured notes	-200,000	0	-230,100
Proceeds from mortgage loans	0	10,401	34,599
Repayments of mortgage loans	-56,156	-10,605	-35,099
Proceeds from credit facility	517,550	611,550	839,250
Repayments on credit facility	-350,550	-703,550	-886,650
Payment of deferred financing costs	-3,629	-5,866	-7,206
Capital contributions	58,473	969,468	58,710
Distributions to partners	-287,589	-249,778	-239,814
Net cash (used in) provided by financing activities	-321,901	1,005,766	12,690
Net (decrease) increase in cash and cash equivalents	-91,754	123,817	17,187
(Decrease) increase in cash and cash equivalents related to foreign currency translation	-2,314	1,241	2,965
Cash and cash equivalents at beginning of year	163,414	38,356	18,204
Cash and cash equivalents at end of year	$69,346	$163,414	$38,356

Balance_Sheet_Parenthetical_Pa

Balance Sheet Parenthetical (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Treasury Stock, Shares	1,249,909	1,249,909
Common shares outstanding	149,807,179	147,846,801
Common Stock, Shares, Issued	149,807,179	147,846,801
Common Stock, Shares Authorized	283,987,000	183,987,000
Common Stock, Par or Stated Value Per Share	$0.00	$0.00
Redeemable Preferred Stock [Member]
Temporary Equity, Preferred Units, Outstanding	301,483	301,483
Liberty Property Limited Partnership [Member]
Limited Partners' units outstanding	3,553,566	3,556,566
Treasury Stock, Shares	1,249,909	1,249,909
Common shares outstanding	148,557,270	146,596,892
Liberty Property Limited Partnership [Member] | Redeemable Preferred Stock [Member]
Temporary Equity, Preferred Units, Outstanding	301,483	301,483

Income_Statement_Parenthetical

Income Statement Parenthetical (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$46,631	$95,384	$12,426
Liberty Property Limited Partnership [Member]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$46,631	$95,384	$12,426

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Organization and Basis of Presentation [Abstract]
Organization and Basis of Presentation	ORGANIZATION
	Liberty Property Trust (the “Trust”) is a self-administered and self-managed Maryland real estate investment trust (a “REIT”). Substantially all of the Trust’s assets are owned directly or indirectly, and substantially all of the Trust’s operations are conducted directly or indirectly, by its subsidiary, Liberty Property Limited Partnership, a Pennsylvania limited partnership (the “Operating Partnership” and, together with the Trust and their consolidated subsidiaries, the “Company”). The Trust is the sole general partner and also a limited partner of the Operating Partnership, owning 97.7% of the common equity of the Operating Partnership at December 31, 2014. The Company owns and operates industrial properties nationally and owns and operates office properties in a focused group of office markets. Additionally, the Company owns certain assets in the United Kingdom. Unless otherwise indicated, the notes to the Consolidated Financial Statements apply to both the Trust and the Operating Partnership. The terms the "Company,” “we,” “our” and “us” means the Trust and Operating Partnership collectively.
	All square footage amounts are unaudited.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Policy Text Block [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("US GAAP") requires management to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
	Principles of Consolidation
	The consolidated financial statements of the Company include the Trust, the Operating Partnership, wholly owned subsidiaries and those subsidiaries in which the Company owns a majority voting interest with the ability to control operations of the subsidiaries and where no approval, veto or other important rights have been granted to the noncontrolling shareholders. All significant intercompany transactions and accounts have been eliminated.
	Reclassifications
	Certain amounts from prior years have been reclassified to conform to current-year presentation including reclassifying the accompanying consolidated balance sheets for assets held for sale and the consolidated statements of comprehensive income for discontinued operations.
	Real Estate and Depreciation
	The properties are recorded at cost and are depreciated using the straight line method over their estimated useful lives. The estimated useful lives are as follows:
	Building and improvements		40 years (blended)
	Capital improvements		15 - 20 years
	Equipment		5 - 10 years
	Tenant improvements		Term of the related lease
	Expenditures directly related to the acquisition or the improvement of real estate, including interest and other costs capitalized during development, are included in net real estate and are stated at cost. The capitalized costs include pre-construction costs essential to the development of the property, development and construction costs, interest costs, real estate taxes, development-related salaries and other costs incurred during the period of development. Construction related payables at December 31, 2014 and 2013 was $41.5 million and $55.6 million.
	The Company allocates the purchase price of real estate acquired to land, building and improvements and intangibles based on the fair value of each component. Lease values for acquired properties are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management's estimate of fair market lease rates for each corresponding in-place lease ("Market Value Intangible"). Origination values are also assigned to in-place leases, and, where appropriate, value is assigned to customer relationships ("Origination Value Intangible").
	Acquisition-related costs for properties with in-place leases are expensed as incurred. Expenditures for maintenance and repairs are charged to operations as incurred.
	The Company depreciates the amounts allocated to building and improvements over 40 years and the amounts allocated to intangibles relating to in-place leases, which are included in deferred financing and leasing costs and other liabilities in the accompanying consolidated balance sheets, over the remaining term of the related leases. Market Value Intangible amortization is recorded as rental revenue. Origination Value Intangible amortization is recorded as depreciation and amortization. This calculation includes both the remaining noncancelable period and any bargain renewal option periods.
	Once a property is designated as held for sale, no further depreciation expense is recorded.
	The Company evaluates its real estate investments upon occurrence of a significant adverse change in its operations to assess whether any impairment indicators are present that affect the recovery of the recorded value. If indicators of impairment are identified, the Company estimates the future undiscounted cash flows from the use and eventual disposition of the property and compares this amount to the carrying value of the property. If any real estate investment is considered impaired, a loss is recognized to reduce the carrying value of the property to its estimated fair value.
	Investments in Unconsolidated Joint Ventures
	The Company accounts for its investments in unconsolidated joint ventures using the equity method of accounting as the Company exercises significant influence, but does not control these entities. Under the equity method of accounting, the net equity investment of the Company is reflected in the accompanying consolidated balance sheets and the Company's share of net income from the joint ventures is included in the accompanying consolidated statements of comprehensive income.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company's investments in unconsolidated joint ventures may be other-than-temporarily-impaired. An investment is impaired only if management's estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other-than-temporary. To the extent impairment has occurred, the loss is measured as the excess of the carrying amount of the investment over the estimated fair value of the investment. The estimated fair value of the investments is determined using a discounted cash flow model which is a Level 3 valuation under ASC 820, "Fair Value Measurement." The Company considers a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, operating costs, capitalization rates, holding periods and discount rates.
	During the year ended December 31, 2012, the Company recognized an impairment charge related to the decline in the fair value below the carrying value of one of the Company's investments in unconsolidated joint ventures. The Company considered the decline in fair value below the carrying value of $0.7 million to be other-than-temporary. This impairment charge was recognized in the fourth quarter of 2012 and was related to the Company's United Kingdom reportable segment.
	No impairment losses on the Company's investments in unconsolidated joint ventures were recognized during the years ended December 31, 2013 or 2014.
	Cash and Cash Equivalents
	Highly liquid investments with a maturity of three months or less when purchased are classified as cash equivalents.
	Restricted Cash
	Restricted cash includes tenant security deposits and escrow funds that the Company maintains pursuant to certain mortgage loans. Restricted cash also includes the undistributed proceeds from the sale of residential land in Kent County, United Kingdom.
	Accounts Receivable/Deferred Rent Receivable
	The Company's accounts receivable are comprised of rents and charges for property operating costs due from tenants. The Company's deferred rent receivable represents the cumulative difference between rent revenue recognized on a straight line basis and contractual payments due under the terms of tenant leases. The Company periodically performs a detailed review of amounts due from tenants to determine if accounts receivable and deferred rent receivable balances are collectible. Based on this review, accounts receivable and deferred rent receivable are reduced by an allowance for doubtful accounts. The Company considers tenant credit quality and payment history and general economic conditions in determining the allowance for doubtful accounts. If the accounts receivable balance or the deferred rent receivable balance is subsequently deemed uncollectible, the receivable and allowance for doubtful account balance are written off.
	The allowance for doubtful accounts at December 31, 2014 and 2013 was $7.4 million and $7.8 million, respectively. The Company had bad debt expense of $1.7 million, $1.8 million and $0.5 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Revenues
	The Company earns rental income under operating leases with tenants. Rental income is recognized on a straight line basis over the applicable non-cancelable lease term. Operating expense reimbursements consisting of amounts due from tenants for real estate taxes, utilities and other recoverable costs are recognized as revenue in the period in which the corresponding expenses are incurred.
	The Company considers any renewal options in determining the lease term. To the extent a lease includes a tenant option to renew or extend the duration of the lease at a fixed or determinable rental rate, the Company evaluates whether or not that option represents a bargain renewal option by analyzing if there is reasonable assurance at lease inception that the tenant will exercise the option because the rental rate is sufficiently lower than the expected rental rate for equivalent property under similar terms and conditions at the exercise date.
	Termination fees (included in rental revenue) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date. The Company recognizes termination fees during the period that landlord services are rendered in accordance with Securities and Exchange Commission Staff Accounting Bulletin 104, "Revenue Recognition," after the following conditions are met:
	a.	the termination agreement is executed,
	b.	the termination fee is determinable, and
	c.	collectability of the termination fee is assured.
	Deferred Financing and Leasing Costs
	Costs incurred in connection with financing or leasing are capitalized and amortized on a straight line basis over the term of the related loan or lease. Deferred financing cost amortization is reported as interest expense. Certain employees of the Company are compensated for leasing services related to the Company's properties. The compensation directly related to these leasing services is capitalized and amortized as a deferred leasing cost over the term of the related lease.
	Fair Value of Financial Instruments
	The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies. However, considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the following estimates are not necessarily indicative of the amounts the Company could have realized on disposition of the financial instruments at December 31, 2014 and December 31, 2013. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.
	The carrying value of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued interest, dividend and distributions payable and other liabilities are reasonable estimates of fair value because of the short-term nature of these instruments. The carrying value of the outstanding amounts under the Company's credit facility is also a reasonable estimate of fair value because interest rates float at a rate based on LIBOR.
	The Company determines the fair value of its interest rate swaps by using the standard methodology of netting discounted future fixed cash payments with the discounted expected variable cash receipts. These variable cash receipts of interest rate swaps are based on expectations of future LIBOR interest rates (forward curves) estimated by observing market LIBOR interest rate curves. This is a Level 2 fair value calculation. Also, credit valuation adjustments are factored into the fair value calculations to account for potential nonperformance risk. These credit valuation adjustments were concluded to be not significant inputs for the fair value calculations for the periods presented. See Note 21 - Derivative Instruments.
	The Company used a discounted cash flow model to determine the estimated fair value of its debt as of December 31, 2014 and December 31, 2013. This is a Level 3 fair value calculation. The inputs used in preparing the discounted cash flow model include actual maturity dates and scheduled cash flows as well as estimates for market value discount rates. The Company updates the discounted cash flow model on a quarterly basis to reflect any changes in the Company's debt holdings and changes to discount rate assumptions.
	The following summarizes the fair value of the Company's mortgage loans and unsecured notes from December 31, 2013 to December 31, 2014 (in thousands):
			Mortgage Loans				Unsecured Notes
			Carrying Value		Fair Value		Carrying Value		Fair Value
	As of December 31, 2013		$	545,306	$	573,944	$	2,708,213	$	2,764,831
	As of December 31, 2014		$	487,301	$	501,231	$	2,509,094	$	2,704,069
	Income Taxes
	The Company has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the "Code"). As a result, the Company generally is not subject to federal income taxation at the corporate level to the extent it distributes annually at least 100% of its REIT taxable income, as defined in the Code, to its shareholders and satisfies certain other organizational and operational requirements. The Company has met these requirements and, accordingly, no provision has been made for federal income taxes in the accompanying consolidated financial statements. If the Company fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate rates (including any alternative minimum tax) and may not be able to qualify as a REIT for the four subsequent taxable years. Even as a REIT, the Company may be subject to certain state and local income and property taxes, and to federal income and excise taxes on undistributed taxable income.
	Several of the Company's subsidiaries are taxable REIT subsidiaries (each a "TRS") and are subject to federal income taxes. In general, a TRS may perform additional services for tenants and generally may engage in real estate or non-real estate businesses that are not permitted REIT activities. The Company is also taxed in certain states, the United Kingdom, and Luxembourg. Accordingly, the Company has recognized federal, state and foreign income taxes in accordance with US GAAP, as applicable.
	There are no uncertain tax positions or possibly significant unrecognized tax benefits that are reasonably expected to occur within the next 12 months. The Company's policy is to recognize interest accrued related to unrecognized benefits in interest expense and penalties in other expense. There were no interest or penalties deducted in any of the years ended December 31, 2014, 2013 and 2012 and no interest and penalties accrued at December 31, 2014 or December 31, 2013.
	Certain of the Company's taxable REIT subsidiaries had net operating loss carryforwards available of approximately $28.7 million as of December 31, 2014. These carryforwards begin to expire in 2018. The Company has considered future taxable income and has determined that a valuation allowance for the full carrying value of net operating loss carryforwards is appropriate.
	The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, certain state and local jurisdictions, the United Kingdom and Luxembourg. With few exceptions, the Company is no longer subject to U.S. federal, state, and local, or United Kingdom and Luxembourg examinations by tax authorities for years before 2008.
	The Federal tax cost basis of the wholly owned real estate was $7.5 billion and $7.4 billion at December 31, 2014 and 2013, respectively.
	Share-Based Compensation
	Share-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as expense over the employees' requisite service period.
	Derivative Financial Instruments
	We borrow funds at a combination of fixed and variable rates. Borrowings under our revolving credit facility and certain bank mortgage loans bear interest at variable rates. Our long-term debt typically bears interest at fixed rates. Our interest rate risk management objectives are to limit generally the impact of interest rate changes on earnings and cash flows and to lower our overall borrowing costs. To achieve these objectives, from time to time, we enter into interest rate hedge contracts such as collars, swaps, caps and treasury lock agreements in order to mitigate our interest rate risk with respect to various debt instruments. We generally do not hold or issue these derivative contracts for trading or speculative purposes. The interest rate on all of our variable rate debt is generally adjusted at one or three month intervals, subject to settlements under interest rate hedge contracts.
	Interest rate swaps involve the receipt of variable-rate amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) (for the Trust) and general partner's equity and limited partners' equity - common units (for the Operating Partnership) and is subsequently reclassified into interest expense in the period that the hedged forecasted transaction affects earnings.
	Foreign Currency
	The functional currency of the Company's United Kingdom operations is pounds sterling. The Company translates the financial statements for the United Kingdom operations into US dollars. For the Trust, gains and losses resulting from this translation are included in accumulated other comprehensive (loss) income as a separate component of shareholders' equity and a proportionate amount of gain or loss is allocated to noncontrolling interest - operating partnership - common units. For the Operating Partnership, gains and losses resulting from this translation are included in general partner's equity and limited partners' equity - common units. Upon sale or upon complete or substantially complete liquidation of the Company's foreign investment, the gain or loss on the sale will include the cumulative translation adjustments that have been previously recorded in accumulated other comprehensive (loss) income and noncontrolling interest - operating partnership - common units (for the Trust) and in general partner's equity and limited partners' equity - common units (for the Operating Partnership).
Comprehensive Income
Comprehensive income, as reflected on the consolidated statements of comprehensive income, is defined as all changes in equity during each period except for those resulting from investments by or distributions to shareholders. Accumulated other comprehensive (loss) income, as reflected on the Company's consolidated balance sheets and consolidated statements of equity, reflects the effective portion of the cumulative changes in the fair value of derivatives in qualifying cash flow hedge relationships as well as gains and losses resulting from foreign currency translation.
Sales of Real Estate
The Company accounts for the sale of real estate assets and any related gain recognition in accordance with the accounting guidance applicable to sales of real estate, which establishes standards for recognition of profit on all real estate sales transactions, other than retail land sales. The Company recognizes the sale, and associated gain or loss from the disposition, provided that the earnings process is complete and the Company is not obligated to perform significant activities after the sale.
Earnings Per Share of the REIT
Basic earnings per share is calculated by dividing the income available to common shareholders for the period by the weighted average number of common shares outstanding during the period using the two class method. Diluted earnings per share is calculated by dividing the net income available to common shareholders for the period by the weighted average number of common and dilutive securities outstanding during the period.
Earnings Per Unit of the Operating Partnership
Basic earnings per unit is calculated by dividing the income available to common unitholders for the period by the weighted average number of common units outstanding during the period using the two class method. Diluted earnings per unit is calculated by dividing the income available to common unitholders for the period by the weighted average number of common and dilutive securities outstanding during the period.
Recently Issued Accounting Standards
In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (ASU) 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360), Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"), which changes the requirements for reporting discontinued operations. Under ASU 2014-08, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results when the component or group of components meets the criteria to be classified as held for sale or when the component or group of components is disposed of by sale or other than by sale. Generally, the sale of a real estate asset would not meet the discontinued operations criteria and would not be presented as such under ASU 2014-08. ASU 2014-08 also requires additional disclosures about both discontinued operations and the disposal of an individually significant component of an entity that does not qualify for discontinued operations presentation in the financial statements. The Company has adopted the provisions of ASU 2014-08 effective January 1, 2014, and has applied the provisions prospectively.
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance. The standard clarifies the required factors that an entity must consider when recognizing revenue. The standard also requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. ASU 2014-09 is effective for the Company beginning January 1, 2017. The Company is evaluating the impact ASU 2014-09 will have on its financial position and results of operations.

Income_per_Common_Share_of_the

Income per Common Share of the Trust	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings common share of the Trust [Text Block]	INCOME PER COMMON SHARE OF THE TRUST
	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):
		2014										2013
		Income			Weighted			Per Share				Income		Weighted	Per Share
		(Numerator)			Average							(Numerator)		Average
					Shares									Shares
					(Denominator)									(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	170,471		147,216			$	1.16			$	91,274	130,180	$	0.7
	Dilutive shares for long-term compensation plans	—			670							—		729
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	170,471			147,886			$	1.15			91,274		130,909	$	0.7
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,216			$	0.32			118,464		130,180	$	0.91
	Dilutive shares for long-term compensation plans	—			670							—		729
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,886			$	0.32			118,464		130,909	$	0.9
	Basic income per common share
	Net income available to common shareholders	217,910			147,216			$	1.48			209,738		130,180	$	1.61
	Dilutive shares for long-term compensation plans	—			670							—		729
	Diluted income per common share
	Net income available to common shareholders	$	217,910		147,886			$	1.47			$	209,738	130,909	$	1.6
		2012
		Income			Weighted			Per Share
		(Numerator)			Average
					Shares
					(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	88,008		116,863			$	0.75
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	88,008			117,694			$	0.75
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			116,863			$	0.43
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			117,694			$	0.42
	Basic income per common share
	Net income available to common shareholders	137,436			116,863			$	1.18
	Dilutive shares for long-term compensation plans	—			831
	Diluted income per common share
	Net income available to common shareholders	$	137,436		117,694			$	1.17
	Dilutive shares for long-term compensation plans represent the unvested common shares outstanding during the year as well as the dilutive effect of outstanding options. The amounts of anti-dilutive options that were excluded from the computation of diluted income per common share as the exercise price was higher than the average share price of the Company in 2014, 2013 and 2012 were 850,000, 959,000 and 905,000, respectively.
Stock option exercises [Text Block]	During the years ended December 31, 2014, 2013 and 2012, 44,000, 504,000 and 841,000 common shares, respectively, were issued upon the exercise of options.
	SHARE-BASED COMPENSATION
	Compensation Plans
	The Company has a share-based compensation plan (the "Plan") which is utilized to compensate key employees and non-employee trustees. In addition, the Company has a 2008 Long-Term Incentive Plan (the "2008 Plan") which is applicable to the Company's executive officers. Pursuant to both the Plan and the 2008 Plan, grants of stock options, restricted shares and restricted stock units have been made. The Company has authorized the grant of shares and options under the Plan and the 2008 Plan of up to 21.1 million common shares of the Company.
	Options
	All options granted have a 10-year term and most options vest and are expensed over a 3-year period, with options to purchase up to 20% of the shares exercisable after the first anniversary, up to 50% after the second anniversary and 100% after the third anniversary of the date of grant.
	Share-based compensation cost related to options for the years ended December 31, 2014, 2013 and 2012 was $1.8 million, $1.6 million and $1.7 million, respectively.
	The fair value of share option awards is estimated on the date of the grant using the Black-Scholes option valuation model. The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	1.60%		1.10%	1.10%
	Dividend yield	5.20%		5.40%	5.70%
	Historical volatility factor	0.236		0.356	0.377
	Weighted-average expected life	6 years		6 years	5 years
	The historical volatility factor is based on the Company's historical monthly share prices. The weighted-average expected life is based on the contractual term of the options as well as the historical periods held before exercise.
	A summary of the Company's share option activity and related information for the year ended December 31, 2014 follows:
			Options (000s)		Weighted Average Exercise Price
	Outstanding January 1, 2014		2,355		$	36.9
	Granted		439		37.32
	Exercised		(44	)	30.66
	Forfeited		(258	)	42.69
	Outstanding December 31, 2014		2,492		$	36.48
	Exercisable at December 31, 2014		1,750		$	36.16
	The weighted average fair value of options granted during the years ended December 31, 2014, 2013 and 2012 was $4.09, $7.18 and $6.55, respectively. Exercise prices for options outstanding as of December 31, 2014 ranged from $20.32 to $49.74. At December 31, 2014, the weighted average remaining contractual life of the options outstanding and exercisable was 5.4 years and 4.0 years, respectively.
	During the years ended December 31, 2014, 2013 and 2012, the total intrinsic value of share options exercised (the difference between the market price at exercise and the price paid by the individual to exercise the option) was $310,000, $4.9 million and $5.9 million, respectively. As of December 31, 2014, 565,000 of the options outstanding and exercisable had an exercise price higher than the closing price of the Company's common shares and are considered to have no intrinsic value at that date. As of December 31, 2014, 1.2 million options outstanding and exercisable had an exercise price lower than the closing price of the Company's common shares. The aggregate intrinsic value of these options was $6.8 million at that date. The total cash received from the exercise of options for the years ended December 31, 2014, 2013 and 2012 was $1.4 million, $15.2 million and $22.9 million, respectively. The Company has historically issued new shares to satisfy share option exercises.
	As of December 31, 2014, there was $324,000 of unrecognized compensation costs related to nonvested options granted under the Plan. That cost is expected to be recognized over a weighted average period of 0.8 years.
	Long Term Incentive Shares ("LTI")
	Restricted LTI share grants made under the Plan are valued at the grant date fair value, which is the market price of the underlying common shares, and vest ratably over a 5-year period beginning with the first anniversary of the grant.
	During 2014, 2013 and 2012, the Company granted restricted stock units to the executive officers pursuant to the 2008 Plan. For the chief executive officer's award, a portion of the restricted stock units will vest up to 272% at the end of a 3-year period for the 2014, 2013 and 2012 awards. For the other executives, a portion of the restricted stock units will vest up to 200% at the end of a 3-year period for the 2014, 2013 and 2012 awards. A portion ("First Portion") of the award vests based on whether the Company's total return exceeds the average total returns of a selected group of peer companies. The grant date fair value of the First Portion was calculated based on a Monte Carlo simulation model and was determined to be 157%, 150% and 159% of the market value of a common share as of the grant date ("Market Value") for the chief executive officer and 125%, 121% and 127% of the Market Value for the other executives for the 2014, 2013 and 2012 grants, respectively. The First Portion is amortized over the respective 3-year period subject to certain accelerated vesting due to the age and years of service of certain executive officers. Another portion ("Second Portion") of the award vests based on the Company's Funds from operations. Targets are established for each of the 3 years in the relevant award period. Depending on how each year's performance compares to the projected performance for that year, the restricted stock units are deemed earned and will vest at the end of the award period. The fair value of the Second Portion is based on the market value of a common share as of the grant date and is being amortized to expense during the period from grant date to the vesting dates, adjusting for the expected level of vesting that is anticipated to occur at those dates also subject to certain accelerated vesting provisions as described above.
	The key assumptions used in the Monte Carlo simulation are as follows:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	0.68%		0.35%	0.52%
	Volatility	24%		26%	41%
	The volatility factor is based on the Company's historical daily share prices.
	Share-based compensation cost related to restricted LTI share grants for the years ended December 31, 2014, 2013 and 2012 were $9.0 million, $9.1 million and $8.7 million, respectively.
	The Company's restricted LTI share activity for the year ended December 31, 2014 is as follows:
			Shares (000s)		Weighted Avg. Grant Date Fair value
	Nonvested at January 1, 2014		786		$	35.37
	Granted		263		37.13
	Vested		(282	)	32.93
	Forfeited		(14	)	36.19
	Nonvested at December 31, 2014		753		$	36.89
	The weighted average fair value of restricted shares granted during the years ended December 31, 2014, 2013 and 2012 was $37.13, $39.42 and $34.61 per share, respectively. As of December 31, 2014, there was $12.5 million of total unrecognized compensation cost related to nonvested shares granted under the Plan. That cost is expected to be recognized over a weighted average period of 1.4 years. The total fair value of restricted shares vested during the years ended December 31, 2014, 2013 and 2012 was $9.3 million, $9.9 million and $8.7 million, respectively.
	Bonus Shares
	The Plan provides that employees of the Company may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to 120% of the cash value of the bonus or commission, less applicable withholding tax. Bonus Shares issued for the years ended December 31, 2014, 2013 and 2012 were 103,834, 79,271 and 80,573, respectively. Share-based compensation cost related to Bonus Shares for the years ended December 31, 2014, 2013 and 2012 was $3.9 million, $3.1 million and $2.9 million, respectively.
	Profit Sharing Plan
	The Plan provides that employees of the Company, below the officer level, may receive up to 5% of base pay in the form of cash contributions to an investment account depending on Company performance. Compensation cost related to the profit sharing plan for the years ended December 31, 2014, 2013 and 2012 was $543,000, $698,000 and $564,000 respectively.
	An additional 6,100,098, 6,637,761 and 7,156,179 common shares were reserved for issuance for future grants under the Plan and the 2008 Plan at December 31, 2014, 2013 and 2012, respectively.
	Employee Share Purchase Plan
	The Company registered 750,000 common shares under the Securities Act of 1933, as amended, in connection with an employee share purchase plan ("ESPP"). The ESPP enables eligible employees to purchase shares of the Company, in amounts up to 10% of the employee's salary, at a 15% discount to fair market value. There were 12,612, 16,793 and 18,611 shares issued, in accordance with the ESPP, during the years ended December 31, 2014, 2013 and 2012, respectively. Share-based compensation cost related to the ESPP for the years ended December 31, 2014, 2013 and 2012 was $104,000, $71,000 and $99,000, respectively.
Unit conversions and dividends per share [Text Block]	During the years ended December 31, 2014, 2013 and 2012, individuals acquired 3,000, 157,285 and 94,895 common shares, respectively, in exchange for the same number of common units. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.
	During the years ended December 31, 2014, 2013 and 2012, distributions per common share were $1.90 for each period.
	SHAREHOLDERS' EQUITY - TRUST
	Common Shares
	The Company paid to holders of its common shares and holders of its common units distributions of $286.9 million, $247.4 million and $229.7 million during the years ended December 31, 2014, 2013 and 2012, respectively. On a per share basis, the Company paid common share and common unit distributions of $1.90 during each of the years ended December 31, 2014, 2013 and 2012.
	The following unaudited table summarizes the taxability of common share distributions (taxability for 2014 is estimated):
			2014			2013				2012
	Ordinary dividend		$	1.2556		$	1.4312			$	1.5036
	Capital gain - 20%		—			0.0016				—
	IRC Sec 1250 unrecapture gain - 25%		0.3712			0.4672				0.0164
	Return of capital		0.2732			—				0.38
	Total		$	1.9		$	1.9			$	1.9
	The Company's tax return for the year ended December 31, 2014 has not been filed. The taxability information presented for the 2014 distributions is based upon the best available data. The Company's prior federal income tax returns are subject to examination by taxing authorities. Because the application of tax laws and regulations is susceptible to varying interpretations, the taxability of distributions could be changed at a later date upon final determination by taxing authorities.
	Common units
	The common units of the Operating Partnership not held by the Trust outstanding as of December 31, 2014 have the same economic characteristics as common shares of the Trust. The 3,553,566 outstanding common units of the Operating Partnership not held by the Trust share proportionately in the net income or loss and in any distributions of the Operating Partnership. The common units of the Operating Partnership not held by the Trust are redeemable at any time at the option of the holder. The Trust, as the sole general partner of the Operating Partnership, may at its option elect to settle the redemption in cash or through the exchange on a one-for-one basis with unregistered common shares of the Trust. The market value of the 3,553,566 outstanding common units based on the closing price of the common shares of the Company at December 31, 2014 was $133.7 million.
	No common units were issued in connection with acquisitions during 2014, 2013 or 2012.
	Preferred units
	The Operating Partnership had no outstanding cumulative redeemable preferred units of the Operating Partnership as of December 31, 2014. During the year ended December 31, 2013, the Company redeemed or repurchased $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions and repurchases, the Company wrote off $1.2 million in origination costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	During the year ended December 31, 2012, the Company redeemed $32.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units for $26.0 million. Also, the Company redeemed $95.0 million of outstanding 7.45% Series B Cumulative Redeemable Preferred Units and $100.0 million of outstanding 7.40% Series H Cumulative Redeemable Preferred Units at par. In connection with these redemptions, during the year ended December 31, 2012, the Company recognized a $3.7 million net gain relating to the excess of preferred unit carrying amount over redemption price net of certain costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	The Company paid the following Equity Preferred Unit distributions for the years ended December 31:
			2013		2012
	Distributions (in millions)		$1.60		$9.90
	Distribution per unit:
	Series B		—		$0.45
	Series E		$1.21		$3.50
	Series F		$1.32		$1.43
	Series G		$1.33		$3.35
	Series H		—		$0.77
	As of December 31, 2014, the Company had 16,013,000 authorized but unissued preferred shares.
	Dividend Reinvestment and Share Purchase Plan
	The Company has a Dividend Reinvestment and Share Purchase Plan under which holders of common shares may elect to automatically reinvest their distributions in additional common shares and may make optional cash payments for additional common shares. The Company may issue additional common shares or repurchase common shares in the open market for purposes of satisfying its obligations under the Dividend Reinvestment and Share Purchase Plan. During the years ended December 31, 2014, 2013, and 2012, 1,643,536, 1,248,842, and 1,037,712 common shares, respectively, were issued through the Dividend Reinvestment and Share Purchase Plan. The Company used the proceeds to pay down outstanding borrowings under the Company's Credit Facility and for general corporate purposes.
	Continuous Equity Offering
	The Company has a continuous equity offering program in place for up to $200 million of equity. During the year ended December 31, 2013, the Company sold 1.9 million common shares through this program. The aggregate proceeds from the offering of $75.0 million were used to pay down outstanding borrowings under the Company's unsecured credit facility and for general corporate purposes. The Company did not sell any common shares pursuant to its continuous offering program during 2014 or 2012.
	Noncontrolling Interest - Consolidated Joint Ventures
	Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments.

Income_per_Common_Unit_of_the_

Income per Common Unit of the Operating Partnership	12 Months Ended
	Dec. 31, 2014
Earnings Per Unit, Basic and Diluted [Line Items]
Earnings per common unit of the Operating Partnership [Text Block]	INCOME PER COMMON SHARE OF THE TRUST
	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):
		2014										2013
		Income			Weighted			Per Share				Income			Weighted	Per Share
		(Numerator)			Average							(Numerator)			Average
					Shares										Shares
					(Denominator)										(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	170,471		147,216			$	1.16			$	91,274		130,180	$	0.7
	Dilutive shares for long-term compensation plans	—			670							—			729
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	170,471			147,886			$	1.15			91,274			130,909	$	0.7
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,216			$	0.32			118,464			130,180	$	0.91
	Dilutive shares for long-term compensation plans	—			670							—			729
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,886			$	0.32			118,464			130,909	$	0.9
	Basic income per common share
	Net income available to common shareholders	217,910			147,216			$	1.48			209,738			130,180	$	1.61
	Dilutive shares for long-term compensation plans	—			670							—			729
	Diluted income per common share
	Net income available to common shareholders	$	217,910		147,886			$	1.47			$	209,738		130,909	$	1.6
		2012
		Income			Weighted			Per Share
		(Numerator)			Average
					Shares
					(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	88,008		116,863			$	0.75
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	88,008			117,694			$	0.75
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			116,863			$	0.43
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			117,694			$	0.42
	Basic income per common share
	Net income available to common shareholders	137,436			116,863			$	1.18
	Dilutive shares for long-term compensation plans	—			831
	Diluted income per common share
	Net income available to common shareholders	$	137,436		117,694			$	1.17
	Dilutive shares for long-term compensation plans represent the unvested common shares outstanding during the year as well as the dilutive effect of outstanding options. The amounts of anti-dilutive options that were excluded from the computation of diluted income per common share as the exercise price was higher than the average share price of the Company in 2014, 2013 and 2012 were 850,000, 959,000 and 905,000, respectively.
Stock option exercises [Text Block]	During the years ended December 31, 2014, 2013 and 2012, 44,000, 504,000 and 841,000 common shares, respectively, were issued upon the exercise of options.
	SHARE-BASED COMPENSATION
	Compensation Plans
	The Company has a share-based compensation plan (the "Plan") which is utilized to compensate key employees and non-employee trustees. In addition, the Company has a 2008 Long-Term Incentive Plan (the "2008 Plan") which is applicable to the Company's executive officers. Pursuant to both the Plan and the 2008 Plan, grants of stock options, restricted shares and restricted stock units have been made. The Company has authorized the grant of shares and options under the Plan and the 2008 Plan of up to 21.1 million common shares of the Company.
	Options
	All options granted have a 10-year term and most options vest and are expensed over a 3-year period, with options to purchase up to 20% of the shares exercisable after the first anniversary, up to 50% after the second anniversary and 100% after the third anniversary of the date of grant.
	Share-based compensation cost related to options for the years ended December 31, 2014, 2013 and 2012 was $1.8 million, $1.6 million and $1.7 million, respectively.
	The fair value of share option awards is estimated on the date of the grant using the Black-Scholes option valuation model. The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	1.60%		1.10%	1.10%
	Dividend yield	5.20%		5.40%	5.70%
	Historical volatility factor	0.236		0.356	0.377
	Weighted-average expected life	6 years		6 years	5 years
	The historical volatility factor is based on the Company's historical monthly share prices. The weighted-average expected life is based on the contractual term of the options as well as the historical periods held before exercise.
	A summary of the Company's share option activity and related information for the year ended December 31, 2014 follows:
			Options (000s)		Weighted Average Exercise Price
	Outstanding January 1, 2014		2,355		$	36.9
	Granted		439		37.32
	Exercised		(44	)	30.66
	Forfeited		(258	)	42.69
	Outstanding December 31, 2014		2,492		$	36.48
	Exercisable at December 31, 2014		1,750		$	36.16
	The weighted average fair value of options granted during the years ended December 31, 2014, 2013 and 2012 was $4.09, $7.18 and $6.55, respectively. Exercise prices for options outstanding as of December 31, 2014 ranged from $20.32 to $49.74. At December 31, 2014, the weighted average remaining contractual life of the options outstanding and exercisable was 5.4 years and 4.0 years, respectively.
	During the years ended December 31, 2014, 2013 and 2012, the total intrinsic value of share options exercised (the difference between the market price at exercise and the price paid by the individual to exercise the option) was $310,000, $4.9 million and $5.9 million, respectively. As of December 31, 2014, 565,000 of the options outstanding and exercisable had an exercise price higher than the closing price of the Company's common shares and are considered to have no intrinsic value at that date. As of December 31, 2014, 1.2 million options outstanding and exercisable had an exercise price lower than the closing price of the Company's common shares. The aggregate intrinsic value of these options was $6.8 million at that date. The total cash received from the exercise of options for the years ended December 31, 2014, 2013 and 2012 was $1.4 million, $15.2 million and $22.9 million, respectively. The Company has historically issued new shares to satisfy share option exercises.
	As of December 31, 2014, there was $324,000 of unrecognized compensation costs related to nonvested options granted under the Plan. That cost is expected to be recognized over a weighted average period of 0.8 years.
	Long Term Incentive Shares ("LTI")
	Restricted LTI share grants made under the Plan are valued at the grant date fair value, which is the market price of the underlying common shares, and vest ratably over a 5-year period beginning with the first anniversary of the grant.
	During 2014, 2013 and 2012, the Company granted restricted stock units to the executive officers pursuant to the 2008 Plan. For the chief executive officer's award, a portion of the restricted stock units will vest up to 272% at the end of a 3-year period for the 2014, 2013 and 2012 awards. For the other executives, a portion of the restricted stock units will vest up to 200% at the end of a 3-year period for the 2014, 2013 and 2012 awards. A portion ("First Portion") of the award vests based on whether the Company's total return exceeds the average total returns of a selected group of peer companies. The grant date fair value of the First Portion was calculated based on a Monte Carlo simulation model and was determined to be 157%, 150% and 159% of the market value of a common share as of the grant date ("Market Value") for the chief executive officer and 125%, 121% and 127% of the Market Value for the other executives for the 2014, 2013 and 2012 grants, respectively. The First Portion is amortized over the respective 3-year period subject to certain accelerated vesting due to the age and years of service of certain executive officers. Another portion ("Second Portion") of the award vests based on the Company's Funds from operations. Targets are established for each of the 3 years in the relevant award period. Depending on how each year's performance compares to the projected performance for that year, the restricted stock units are deemed earned and will vest at the end of the award period. The fair value of the Second Portion is based on the market value of a common share as of the grant date and is being amortized to expense during the period from grant date to the vesting dates, adjusting for the expected level of vesting that is anticipated to occur at those dates also subject to certain accelerated vesting provisions as described above.
	The key assumptions used in the Monte Carlo simulation are as follows:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	0.68%		0.35%	0.52%
	Volatility	24%		26%	41%
	The volatility factor is based on the Company's historical daily share prices.
	Share-based compensation cost related to restricted LTI share grants for the years ended December 31, 2014, 2013 and 2012 were $9.0 million, $9.1 million and $8.7 million, respectively.
	The Company's restricted LTI share activity for the year ended December 31, 2014 is as follows:
			Shares (000s)		Weighted Avg. Grant Date Fair value
	Nonvested at January 1, 2014		786		$	35.37
	Granted		263		37.13
	Vested		(282	)	32.93
	Forfeited		(14	)	36.19
	Nonvested at December 31, 2014		753		$	36.89
	The weighted average fair value of restricted shares granted during the years ended December 31, 2014, 2013 and 2012 was $37.13, $39.42 and $34.61 per share, respectively. As of December 31, 2014, there was $12.5 million of total unrecognized compensation cost related to nonvested shares granted under the Plan. That cost is expected to be recognized over a weighted average period of 1.4 years. The total fair value of restricted shares vested during the years ended December 31, 2014, 2013 and 2012 was $9.3 million, $9.9 million and $8.7 million, respectively.
	Bonus Shares
	The Plan provides that employees of the Company may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to 120% of the cash value of the bonus or commission, less applicable withholding tax. Bonus Shares issued for the years ended December 31, 2014, 2013 and 2012 were 103,834, 79,271 and 80,573, respectively. Share-based compensation cost related to Bonus Shares for the years ended December 31, 2014, 2013 and 2012 was $3.9 million, $3.1 million and $2.9 million, respectively.
	Profit Sharing Plan
	The Plan provides that employees of the Company, below the officer level, may receive up to 5% of base pay in the form of cash contributions to an investment account depending on Company performance. Compensation cost related to the profit sharing plan for the years ended December 31, 2014, 2013 and 2012 was $543,000, $698,000 and $564,000 respectively.
	An additional 6,100,098, 6,637,761 and 7,156,179 common shares were reserved for issuance for future grants under the Plan and the 2008 Plan at December 31, 2014, 2013 and 2012, respectively.
	Employee Share Purchase Plan
	The Company registered 750,000 common shares under the Securities Act of 1933, as amended, in connection with an employee share purchase plan ("ESPP"). The ESPP enables eligible employees to purchase shares of the Company, in amounts up to 10% of the employee's salary, at a 15% discount to fair market value. There were 12,612, 16,793 and 18,611 shares issued, in accordance with the ESPP, during the years ended December 31, 2014, 2013 and 2012, respectively. Share-based compensation cost related to the ESPP for the years ended December 31, 2014, 2013 and 2012 was $104,000, $71,000 and $99,000, respectively.
Unit conversions and dividends per share [Text Block]	During the years ended December 31, 2014, 2013 and 2012, individuals acquired 3,000, 157,285 and 94,895 common shares, respectively, in exchange for the same number of common units. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.
	During the years ended December 31, 2014, 2013 and 2012, distributions per common share were $1.90 for each period.
	SHAREHOLDERS' EQUITY - TRUST
	Common Shares
	The Company paid to holders of its common shares and holders of its common units distributions of $286.9 million, $247.4 million and $229.7 million during the years ended December 31, 2014, 2013 and 2012, respectively. On a per share basis, the Company paid common share and common unit distributions of $1.90 during each of the years ended December 31, 2014, 2013 and 2012.
	The following unaudited table summarizes the taxability of common share distributions (taxability for 2014 is estimated):
			2014			2013				2012
	Ordinary dividend		$	1.2556		$	1.4312			$	1.5036
	Capital gain - 20%		—			0.0016				—
	IRC Sec 1250 unrecapture gain - 25%		0.3712			0.4672				0.0164
	Return of capital		0.2732			—				0.38
	Total		$	1.9		$	1.9			$	1.9
	The Company's tax return for the year ended December 31, 2014 has not been filed. The taxability information presented for the 2014 distributions is based upon the best available data. The Company's prior federal income tax returns are subject to examination by taxing authorities. Because the application of tax laws and regulations is susceptible to varying interpretations, the taxability of distributions could be changed at a later date upon final determination by taxing authorities.
	Common units
	The common units of the Operating Partnership not held by the Trust outstanding as of December 31, 2014 have the same economic characteristics as common shares of the Trust. The 3,553,566 outstanding common units of the Operating Partnership not held by the Trust share proportionately in the net income or loss and in any distributions of the Operating Partnership. The common units of the Operating Partnership not held by the Trust are redeemable at any time at the option of the holder. The Trust, as the sole general partner of the Operating Partnership, may at its option elect to settle the redemption in cash or through the exchange on a one-for-one basis with unregistered common shares of the Trust. The market value of the 3,553,566 outstanding common units based on the closing price of the common shares of the Company at December 31, 2014 was $133.7 million.
	No common units were issued in connection with acquisitions during 2014, 2013 or 2012.
	Preferred units
	The Operating Partnership had no outstanding cumulative redeemable preferred units of the Operating Partnership as of December 31, 2014. During the year ended December 31, 2013, the Company redeemed or repurchased $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions and repurchases, the Company wrote off $1.2 million in origination costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	During the year ended December 31, 2012, the Company redeemed $32.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units for $26.0 million. Also, the Company redeemed $95.0 million of outstanding 7.45% Series B Cumulative Redeemable Preferred Units and $100.0 million of outstanding 7.40% Series H Cumulative Redeemable Preferred Units at par. In connection with these redemptions, during the year ended December 31, 2012, the Company recognized a $3.7 million net gain relating to the excess of preferred unit carrying amount over redemption price net of certain costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	The Company paid the following Equity Preferred Unit distributions for the years ended December 31:
			2013		2012
	Distributions (in millions)		$1.60		$9.90
	Distribution per unit:
	Series B		—		$0.45
	Series E		$1.21		$3.50
	Series F		$1.32		$1.43
	Series G		$1.33		$3.35
	Series H		—		$0.77
	As of December 31, 2014, the Company had 16,013,000 authorized but unissued preferred shares.
	Dividend Reinvestment and Share Purchase Plan
	The Company has a Dividend Reinvestment and Share Purchase Plan under which holders of common shares may elect to automatically reinvest their distributions in additional common shares and may make optional cash payments for additional common shares. The Company may issue additional common shares or repurchase common shares in the open market for purposes of satisfying its obligations under the Dividend Reinvestment and Share Purchase Plan. During the years ended December 31, 2014, 2013, and 2012, 1,643,536, 1,248,842, and 1,037,712 common shares, respectively, were issued through the Dividend Reinvestment and Share Purchase Plan. The Company used the proceeds to pay down outstanding borrowings under the Company's Credit Facility and for general corporate purposes.
	Continuous Equity Offering
	The Company has a continuous equity offering program in place for up to $200 million of equity. During the year ended December 31, 2013, the Company sold 1.9 million common shares through this program. The aggregate proceeds from the offering of $75.0 million were used to pay down outstanding borrowings under the Company's unsecured credit facility and for general corporate purposes. The Company did not sell any common shares pursuant to its continuous offering program during 2014 or 2012.
	Noncontrolling Interest - Consolidated Joint Ventures
	Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments.
Liberty Property Limited Partnership [Member]
Earnings Per Unit, Basic and Diluted [Line Items]
Earnings per common unit of the Operating Partnership [Text Block]	INCOME PER COMMON UNIT OF THE OPERATING PARTNERSHIP
	The following table sets forth the computation of basic and diluted income per common unit of the Operating Partnership (in thousands, except per unit amounts):
		2014										2013
		Income			Weighted			Per Unit				Income			Weighted	Per Unit
		(Numerator)			Average Units							(Numerator)			Average Units
					(Denominator)										(Denominator)
	Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	175,035									$	97,102
	Less: Preferred unit distributions	(472		)								(2,119		)
	Excess of preferred unit redemption over carrying amount	—										(1,236		)
	Basic income from continuing operations
	Income from continuing operations available to common unitholders	174,563			150,770			$	1.16			93,747			133,858	$	0.7
	Dilutive units for long-term compensation plans	—			670							—			729
	Diluted income from continuing operations
	Income from continuing operations available to common unitholders	174,563			151,440			$	1.15			93,747			134,587	$	0.7
	Basic income from discontinued operations
	Discontinued operations	48,581			150,770			$	0.32			121,839			133,858	$	0.91
	Dilutive units for long-term compensation plans	—			670							—			729
	Diluted income from discontinued operations
	Discontinued operations	48,581			151,440			$	0.32			121,839			134,587	$	0.9
	Basic income per common unit
	Income available to common unitholders	223,144			150,770			$	1.48			215,586			133,858	$	1.61
	Dilutive units for long-term compensation plans	—			670							—			729
	Diluted income per common unit
	Income available to common unitholders	$	223,144		151,440			$	1.47			$	215,586		134,587	$	1.6
		2012
		Income			Weighted			Per Unit
		(Numerator)			Average Units
					(Denominator)
	Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	97,022
	Less: Preferred unit distributions	(9,902		)
	Excess of preferred unit carrying amount over redemption	3,689
	Basic income from continuing operations
	Income from continuing operations available to common unitholders	90,809			120,623			$	0.75
	Dilutive units for long-term compensation plans	—			831
	Diluted income from continuing operations
	Income from continuing operations available to common unitholders	90,809			121,454			$	0.75
	Basic income from discontinued operations
	Discontinued operations	51,004			120,623			$	0.43
	Dilutive units for long-term compensation plans	—			831
	Diluted income from discontinued operations
	Discontinued operations	51,004			121,454			$	0.42
	Basic income per common unit
	Income available to common unitholders	141,813			120,623			$	1.18
	Dilutive units for long-term compensation plans	—			831
	Diluted income per common unit
	Income available to common unitholders	$	141,813		121,454			$	1.17
	Dilutive units for long-term compensation plans represent the unvested common units outstanding during the year as well as the dilutive effect of outstanding options. The amounts of anti-dilutive options that were excluded from the computation of diluted income per common unit as the exercise price was higher than the average unit price of the Company in 2014, 2013 and 2012 were 850,000, 959,000 and 905,000, respectively.
Stock option exercises [Text Block]	During the years ended December 31, 2014, 2013 and 2012, 44,000, 504,000 and 841,000 common units, respectively, were issued upon the exercise of options.
Unit conversions and dividends per share [Text Block]	During the years ended December 31, 2014, 2013 and 2012, individuals acquired 3,000, 157,285 and 94,895 common shares of the Trust in exchange for the same number of common units of the Operating Partnership. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.
	During the years ended December 31, 2014, 2013 and 2012, distributions per common unit were $1.90 for each period.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note [Text Block]	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
	The following table sets forth the components of Accumulated Other Comprehensive (Loss) Income (in thousands):
			December 31,
			2014			2013
	Foreign Currency Translation:
	Beginning balance		$	8,592		$	3,195
	Translation adjustment		(14,415		)	5,397
	Ending balance		(5,823		)	8,592
	Derivative Instruments:
	Beginning balance		1,584			—
	Unrealized (loss) gain		(3,419		)	1,584
	Reclassification adjustment (1)		1,458			—
	Ending balance		(377		)	1,584
	Total accumulated other comprehensive (loss) income		(6,200		)	10,176
	Less: portion included in noncontrolling interest – operating partnership		(52		)	(434		)
	Total accumulated other comprehensive (loss) income included in shareholders' equity		$	(6,252	)	$	9,742
	-1	Amounts reclassified out of Accumulated Other Comprehensive (Loss) Income into contractual interest expense.

Real_Estate

Real Estate	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Real Estate Disclosure [Text Block]	REAL ESTATE
	The Company owns and operates industrial and office properties. The carrying value of these properties by type as of December 31, 2014 and 2013 is as follows (in thousands):
		Land			Building
		And Land			And						Accumulated
		Improvements			Improvements				Total		Depreciation
	2014
	Industrial properties	$	773,874		$	3,513,534			$	4,287,408	$	620,967
	Office properties	415,886			1,830,374				2,246,260		561,602
	2014 Total	$	1,189,760		$	5,343,908			$	6,533,668	$	1,182,569
	2013
	Industrial properties	$	707,951		$	3,236,596			$	3,944,547	$	514,073
	Office properties	429,946			1,893,106				2,323,052		537,520
	2013 Total	$	1,137,897		$	5,129,702			$	6,267,599	$	1,051,593
	Depreciation expense was $179.1 million, $162.5 million and $140.6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Information on the operating properties the Company sold during the years ended December 31, 2014 and 2013 is as follows:
	2014 Sales
	Reportable Segment	Number of Buildings		Leaseable Square Feet (unaudited)			Gross Proceeds
							(in thousands)
	Houston	5		553,510			$	29,721
	Maryland	23		1,367,569			185,460
	Minnesota	1		191,336			41,000
	New Jersey	27		1,790,893			164,767
	Orlando	4		588,678			116,750
	Southeastern PA	3		113,833			12,225
	Other	2		134,510			8,655
	Total	65		4,740,329			$	558,578
	2013 Sales
	Reportable Segment	Number of Buildings		Leaseable Square Feet (unaudited)			Gross Proceeds
							(in thousands)
	Carolinas	1		59,200			$	2,000
	Lehigh/Central PA	1		101,750			8,650
	Minnesota	12		915,693			71,493
	Philadelphia	2		656,350			103,650
	Richmond/Hampton Roads	1		86,170			10,978
	Southeastern PA	5		996,874			102,734
	Other	36		2,307,135			192,275
	Total	58		5,123,172			$	491,780

Investments_in_Unconsolidated_

Investments in Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments Disclosure [Text Block]	INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES
	Listed below are the unconsolidated joint ventures in which the Company has a noncontrolling interest. The Company receives fees from these joint ventures for services it provides. These services include property management, leasing, development and administration. These fees are included in interest and other income in the accompanying consolidated statements of comprehensive income. The Company may also receive a promoted interest if certain return thresholds are met. The accounting policies for the unconsolidated joint ventures in which the Company has a noncontrolling interest are the same as those for the Company.
	Liberty Venture I, LP
	As of December 31, 2014, the Company had a 25% interest in Liberty Venture I, LP, an entity engaged in the ownership of industrial properties in New Jersey. This joint venture is part of the Company's New Jersey reportable segment.
	As of December 31, 2014, the joint venture owned 27 industrial properties totaling 3.9 million square feet and 93 acres of developable land.
	During the year ended December 31, 2014, the joint venture acquired three properties comprising 603,000 square feet and 51 acres of land from the Company for $43.0 million.
	The Company recognized $1.4 million, $578,000 and $619,000 in fees for services during the years ended December 31, 2014, 2013 and 2012, respectively.
	Kings Hill Unit Trust
	As of December 31, 2014, the Company had a 20% interest in Kings Hill Unit Trust, an entity engaged in the ownership of office and industrial properties in the County of Kent, United Kingdom. This joint venture is part of the Company's United Kingdom reportable segment.
	As of December 31, 2014, the joint venture owned three industrial properties and 11 office properties totaling 490,000 square feet.
	The Company had notes receivable from Kings Hill Unit Trust for an aggregate of $18.1 million and $18.6 million as of December 31, 2014 and 2013, respectively. The notes receivable bear interest at rates of 2% to 10% and are due in February 2016. These related party receivables are reflected in investments in and advances to unconsolidated joint ventures in the Company's consolidated balance sheets.
	The Company had a receivable from Kings Hill Unit Trust for $267,000 and $133,000 as of December 31, 2014 and 2013, respectively. This related party receivable is reflected in accounts receivable in the Company's consolidated balance sheets.
	The Company had prepaid rent with Kings Hill Unit Trust for $47,000 as of December 31, 2013.
	Income from fees was $285,000, $237,000 and $333,000 during the years ended December 31, 2014, 2013 and 2012, respectively.
	Liberty Illinois, LP
	As of December 31, 2014, the Company had a 25% interest in Liberty Illinois, LP, an entity primarily engaged in the ownership of industrial properties in Illinois. This joint venture is part of the Company's Chicago/Milwaukee reportable segment.
	As of December 31, 2014, the joint venture owned 15 industrial properties totaling 5.1 million square feet and 248 acres of developable land. The joint venture also had one property under development, which is expected to comprise, upon completion, 430,000 square feet and is expected to represent a Total Investment of $24.4 million.
	The Company recognized $1.0 million, $952,000 and $655,000 in fees for services during the years ended December 31, 2014, 2013 and 2012, respectively.
	Blythe Valley JV Sarl
	As of December 31, 2012, the Company had a 20% interest in Blythe Valley JV Sarl, an entity engaged in the ownership of office properties in the West Midlands, United Kingdom. This joint venture was part of the Company's United Kingdom reportable segment.
	During the year ended December 31, 2012, the joint venture recorded an impairment charge, the Company's share of which was sufficient to bring the Company's investment in the joint venture to zero. The Company's share of this impairment charge was $4.6 million and is reflected in equity in earnings (loss) of unconsolidated joint ventures in the Company's consolidated statements of comprehensive income. The Company no longer holds an interest in this joint venture.
	The Company recognized $33,000 and $355,000 in fees for services during the years ended December 31, 2013 and 2012, respectively.
	Liberty Washington, LP
	As of December 31, 2014, the Company had a 25% interest in Liberty Washington, LP, an entity engaged in the ownership of office properties in Northern Virginia and Washington, D.C. This joint venture's properties are part of the Company's Northern Virginia and Washington D.C. reportable segments.
	As of December 31, 2014, the joint venture owned 21 office properties totaling 2.4 million square feet and six acres of developable land.
	The Company had a receivable from Liberty Washington, LP for $470,000 and $523,000 as of December 31, 2014 and 2013, respectively. This related party receivable is reflected as prepaid expenses and other assets in the Company's consolidated balance sheets. Additionally, the Company had a receivable from Liberty Washington, LP for $98,000 as of December 31, 2013. This related party receivable is reflected in accounts receivable in the Company's consolidated balance sheets.
	During the fourth quarter of 2014, the Company concluded that certain of the properties owned by this joint venture were impaired and the joint venture recorded an impairment charge of $172.7 million. The Company was not required to record its share of this impairment charge through equity in earnings (loss) as this amount was previously recognized through an other-than-temporary impairment charge related to this joint venture that was recorded in 2009.
	The Company recognized $4.4 million, $4.9 million and $4.5 million in fees for services during the years ended December 31, 2014, 2013 and 2012, respectively.
	Liberty/Commerz 1701 JFK Boulevard, LP
	As of December 31, 2014, the Company had a 20% interest in Liberty/Commerz 1701 JFK Boulevard, LP ("Liberty/Commerz"), an entity engaged in the ownership of a 1.25 million square foot office tower in Philadelphia, Pennsylvania. This joint venture is part of the Company's Philadelphia reportable segment.
	The Company had a payable to this joint venture for $59,000 as of both December 31, 2014 and 2013. This related party payable is reflected in investments in and advances to unconsolidated joint ventures in the Company's consolidated balance sheets.
	The Company had a receivable from this joint venture for $409,000 and $323,000 as of December 31, 2014 and 2013, respectively. This related party receivable is reflected in prepaid expenses and other assets in the Company's consolidated balance sheets. Additionally, the Company had a receivable from this joint venture for $135,000 as of December 31, 2013. This related party receivable is reflected in accounts receivable in the Company's consolidated balance sheets.
	The Company recognized $2.4 million, $2.2 million and $2.2 million in fees for services during the years ended December 31, 2014, 2013 and 2012 respectively.
	Liberty Property 18th & Arch LP and Liberty Property 18th & Arch Hotel, LP
	On June 30, 2014, the Company entered into two joint ventures for the purpose of developing and owning the Comcast Innovation & Technology Center (the "Project") located in Philadelphia, Pennsylvania as part of a mixed-use development. The 59-story building will include 1.3 million square feet of rentable office space (the "Office") and a 222-room Four Seasons Hotel (the "Hotel"). Completion of the first phase of the Project is anticipated to be in the third quarter of 2017. Project costs for the development of the Project, exclusive of tenant-funded interior improvements, are anticipated to be approximately $921 million.  The Company's investment in the project is expected to be approximately $184 million with 20% ownership interests in both joint ventures. As of December 31, 2014, the Company's investment in these joint ventures was $21.3 million and is reflected in investments in and advances to unconsolidated joint ventures in the Company's consolidated balance sheet. The Company began development on the building during 2014 and as of December 31, 2014, the total development in progress for the Project was $111.2 million. These joint ventures are part of the Company's Philadelphia reportable segment.
	The two joint ventures have engaged the Company as the developer of the Project pursuant to a Development Agreement by which the Company agrees, in consideration for a development fee, to be responsible for all aspects of the development of the Project and to guarantee the timely lien-free completion of construction of the Project and the payment, subject to certain exceptions, of any cost overruns incurred in the development of the Project. During the year ended December 31, 2014, the Company recognized $1.8 million in developer and other fees related to the project. These fees are included in other income in the Company's consolidated statement of comprehensive income.
	The Company had a payable to this joint venture of $554,000 as of December 31, 2014. This payable is included in prepaid expenses and other assets in the Company's consolidated balance sheets.
	The Company will manage and lease the Office and Four Seasons Hotels Limited will manage the Hotel.
	Other Joint Ventures
	As of December 31, 2014, the Company had a 50% ownership interest in four additional unconsolidated joint ventures. One of these joint ventures has four operating properties and an investment in land held for development and is part of the Orlando reportable segment. This joint venture also had two properties under development, which are expected to comprise, upon completion, 369,000 square feet and are expected to represent a Total Investment of $20.5 million. One of these joint ventures has one operating property and an investment in land held for development and is part of the Company's United Kingdom reportable segment. One of these joint ventures owns one acre of developable land and is part of the Company's Philadelphia reportable segment. The final joint venture has a leasehold interest and does not operate or own operating properties and is part of the Company's United Kingdom reportable segment. The Company had a note payable due to this joint venture of $2.9 million and $3.0 million as of December 31, 2014 and 2013, respectively. The note payable is interest free and is due upon written notice from the joint venture. This related party payable is reflected in investments in and advances to unconsolidated joint ventures in the Company's consolidated balance sheets.
	The Company's share of each of the joint venture's earnings is included in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income.
	Summary Financial Data
	The condensed balance sheets as of December 31, 2014 and 2013 and condensed statements of operations for the years ended December 31, 2014, 2013 and 2012 for Liberty Venture I, LP, Kings Hill Unit Trust, Liberty Illinois, LP, Blythe Valley JV Sarl (no remaining interest as of December 31, 2013), Liberty Washington, LP, Liberty/Commerz, Liberty Property 18th & Arch and the other unconsolidated joint ventures are as follows (in thousands):
	Condensed Balance Sheets:
		31-Dec-14
		Liberty			Kings Hill			Liberty			Liberty			Liberty/			Liberty Property
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			18th & Arch (3)			Other			Total
	Real estate assets	$	173,346		$	173,707		$	260,988		$	603,413		$	494,678		$	—		$	69,041		$	1,775,173
	Accumulated depreciation	(32,752		)	(26,494		)	(48,191		)	(35,384		)	(97,189		)	—			(9,651		)	(249,661		)
	Real estate assets, net	140,594			147,213			212,797			568,029			397,489			—			59,390			1,525,512
	Development in progress	—			—			17,973			—			—			111,244			4,366			133,583
	Land held for development	14,108			—			28,362			2,000			—			—			39,438			83,908
	Other assets	15,523			14,928			20,182			50,657			52,393			1,306			38,215			193,204
	Total assets	$	170,225		$	162,141		$	279,314		$	620,686		$	449,882		$	112,550		$	141,409		$	1,936,207
	Debt	$	78,748		$	91,356		$	145,752		$	318,367		$	317,934		$	—		$	43,114		$	995,271
	Other liabilities	5,215			94,504			13,812			12,022			9,657			13,398			14,306			162,914
	Equity	86,262			(23,719		)	119,750			290,297			122,291			99,152			83,989			778,022
	Total liabilities and equity	$	170,225		$	162,141		$	279,314		$	620,686		$	449,882		$	112,550		$	141,409		$	1,936,207
	Company's net investment in unconsolidated joint ventures (1)	$	20,010		$	11,663		$	18,692		$	69,230		$	23,153		$	21,292		$	44,792		$	208,832
		31-Dec-13
		Liberty			Kings Hill			Liberty			Liberty			Liberty/
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			Other			Total
	Real estate assets	$	129,354		$	182,220		$	261,375		$	887,452		$	494,150		$	70,274		$	2,024,825
	Accumulated depreciation	(32,617		)	(25,006		)	(43,304		)	(131,064		)	(83,461		)	(8,456		)	(323,908		)
Real estate assets, net	96,737			157,214			218,071			756,388			410,689			61,818			1,700,917
Development in progress	2,226			—			—			—			—			—			2,226
Land held for development	2,842			—			42,770			2,000			—			47,549			95,161
Other assets	11,531			20,173			20,346			58,701			50,680			15,911			177,342
Total assets	$	113,336		$	177,387		$	281,187		$	817,089		$	461,369		$	125,278		$	1,975,646
Debt	$	72,121		$	97,091		$	140,400		$	319,856		$	321,401		$	43,151		$	994,020
Other liabilities	4,032			100,112			7,936			15,012			9,544			9,846			146,482
Equity	37,183			(19,816		)	132,851			482,221			130,424			72,281			835,144
Total liabilities and equity	$	113,336		$	177,387		$	281,187		$	817,089		$	461,369		$	125,278		$	1,975,646
Company's net investment in unconsolidated joint ventures (1)	$	8,551		$	12,772		$	21,688		$	72,981		$	24,740		$	38,923		$	179,655
Condensed Statements of Operations (2):
	Year Ended December 31, 2014
	Liberty			Kings Hill			Liberty			Liberty			Liberty/			Liberty Property			Other
	Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			18th & Arch (3)			-4			Total
Total revenue	$	19,277		$	13,221		$	25,181		$	72,824		$	63,580		$	—		$	8,923		$	203,006
Operating expense	6,398			5,387			8,965			28,349			23,557			199			2,897			75,752
	12,879			7,834			16,216			44,475			40,023			(199		)	6,026			127,254
Interest	(5,078		)	(6,110		)	(7,932		)	(18,612		)	(20,179		)	—			(3,415		)	(61,326		)
Depreciation and amortization	(5,757		)	(4,135		)	(7,380		)	(27,112		)	(14,591		)	—			(1,891		)	(60,866		)
Other income/(expense)	(17		)	208			39			375			(278		)	(13		)	9,090			9,404
Gain (loss) on sale/impairment	—			—			187			(172,691		)	—			—			—			(172,504		)
Net income (loss)	$	2,027		$	(2,203	)	$	1,130		$	(173,565	)	$	4,975		$	(212	)	$	9,810		$	(158,038	)
Company's equity in earnings (loss) of unconsolidated joint ventures	$	788		$	(288	)	$	824		$	2,251		$	1,633		$	(33	)	$	5,139		$	10,314
	Year Ended December 31, 2013
	Liberty			Kings Hill			Liberty			Liberty			Liberty/
	Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			Other			Total
Total revenue	$	16,238		$	12,701		$	24,455		$	75,821		$	62,411		$	8,415		$	200,041
Operating expense	5,248			4,187			8,353			27,549			23,074			2,636			71,047
	10,990			8,514			16,102			48,272			39,337			5,779			128,994
Interest	(5,318		)	(5,133		)	(8,348		)	(18,946		)	(20,391		)	(2,933		)	(61,069		)
Depreciation and amortization	(4,414		)	(3,829		)	(7,382		)	(28,392		)	(14,734		)	(1,870		)	(60,621		)
Other income/(expense)	53			71			38			122			(233		)	(37		)	14
Loss from discontinued operations	—			(5,647		)	—			(8,731		)	—			—			(14,378		)
Net income (loss)	$	1,311		$	(6,024	)	$	410		$	(7,675	)	$	3,979		$	939		$	(7,060	)
Company's equity in earnings (loss) of unconsolidated joint ventures	$	530		$	(908	)	$	618		$	3,748		$	1,406		$	673		$	6,067
	Year Ended December 31, 2012
	Liberty			Kings Hill			Liberty			Blythe Valley			Liberty			Liberty/
	Venture I, LP			Unit Trust			Illinois, LP			JV Sarl			Washington, LP			Commerz			Other			Total
Total revenue	$	15,328		$	15,642		$	22,156		$	14,278		$	81,128		$	62,484		$	7,481		$	218,497
Operating expense	5,277			4,237			8,093			3,921			27,901			22,935			2,392			74,756
	10,051			11,405			14,063			10,357			53,227			39,549			5,089			143,741
Interest	(5,402		)	(6,520		)	(8,348		)	(12,130		)	(21,260		)	(20,501		)	(2,989		)	(77,150		)
Depreciation and amortization	(3,930		)	(3,731		)	(7,395		)	(4,148		)	(28,749		)	(15,411		)	(1,885		)	(65,249		)
Other income/(expense)	40			(160		)	31			211			149			(80		)	21			212
Impairment	—			—			—			(77,026		)	—			—			—			(77,026		)
Net income (loss)	$	759		$	994		$	(1,649	)	$	(82,736	)	$	3,367		$	3,557		$	236		$	(75,472	)
Company's equity in earnings (loss) of unconsolidated joint ventures	$	306		$	352		$	106		$	(5,610	)	$	3,243		$	1,304		$	(382	)	$	(681	)
-1	Differences between the Company's net investment in unconsolidated joint ventures and its underlying equity in the net assets of the venture are primarily a result of impairments related to the Company's investment in unconsolidated joint ventures, the deferral of gains associated with the sales of properties to joint ventures in which the Company retains an ownership interest and loans made to the joint ventures by the Company. These adjustments have resulted in an aggregate difference increasing the Company's investments in unconsolidated joint ventures by $3.2 million as of December 31, 2014 and reducing the Company's investment in unconsolidated joint ventures by $41.7 million as of December 31, 2013. Differences between historical cost basis and the basis reflected at the joint venture level (other than loans) are typically depreciated over the life of the related asset.
(2) The year ended December 31, 2012 has not been restated for discontinued operations.
(3) Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia.
(4) Other income/(expense) for this group of joint ventures reflects gains related to the sales of land leasehold interests totaling $9.1 million.

Deferred_Financing_and_Leasing

Deferred Financing and Leasing Costs	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets Disclosure [Text Block]	DEFERRED FINANCING AND LEASING COSTS
	Deferred financing and leasing costs were comprised of the following as of December 31, 2014 and 2013 (in thousands):
		December 31,
		2014			2013
	Deferred financing costs	$	38,445		$	36,883
	Deferred leasing costs	215,714			192,194
	Intangible - market rent	18,082			19,366
	Intangible - origination value	103,512			117,905
		375,753			366,348
	Accumulated amortization:
	Deferred financing costs	20,284			17,536
	Deferred leasing costs	100,702			91,989
	Intangible - market rent	8,266			4,180
	Intangible - origination value	40,215			26,576
		169,467			140,281
	Deferred financing and leasing costs, net	$	206,286		$	226,067
	Amortization of deferred financing costs was $4.8 million, $4.1 million and $4.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. Amortization of deferred leasing costs and intangible - origination value was $51.3 million, $39.2 million and $24.0 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	As of December 31, 2014, the remaining weighted-average amortization period was 3.2 years for intangible - market rent and 4.4 years for intangible - origination value.
	The table above includes intangible - market rent assets. There were also $7.5 million and $9.1 million of unamortized market rent - intangible liabilities as of December 31, 2014 and 2013, respectively. These liabilities are included as other liabilities in the accompanying consolidated balance sheets of the Company. Amortization of the aggregate asset and liability for intangible - market rent was expense of $2.8 million and $290,000 for the years ended December 31, 2014 and 2013, respectively, and was income of $491,000 for the year ended December 31, 2012. These amounts were included as a decrease or increase in rental revenue in the accompanying consolidated statements of comprehensive income as appropriate.
	The aggregate amortization of intangible - market rent including the market rent - intangible liabilities is a decrease (increase) in rental revenue over the next five years and thereafter as follows (in thousands):
	2015	$	2,047
	2016	1,426
	2017	586
	2018	80
	2019	3
	Thereafter	(1,779		)
	Total	$	2,363
	The aggregate amortization expense for intangible - origination value for the next five years and thereafter is as follows (in thousands):
	2015	$	21,292
	2016	16,273
	2017	10,614
	2018	6,249
	2019	3,081
	Thereafter	5,788
	Total	$	63,297

Indebtedness

Indebtedness	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	INDEBTEDNESS
	Overview
	Indebtedness consists of mortgage loans, unsecured notes, and borrowings under a credit facility. The weighted average interest rates for the years ended December 31, 2014, 2013 and 2012 were 5.0%, 5.1% and 5.3%, respectively. Interest costs during the years ended December 31, 2014, 2013 and 2012 in the amount of $13.2 million, $9.6 million and $9.9 million, respectively, were capitalized. Cash paid for interest for the years ended December 31, 2014, 2013 and 2012 was $164.9 million, $143.2 million and $132.2 million, respectively.
	The Company is subject to financial covenants contained in some of its debt agreements, the most restrictive of which are detailed below under the heading "Credit Facility." As of December 31, 2014, the Company was in compliance with all financial and non-financial covenants.
	The scheduled principal amortization and maturities of the Company's mortgage loans, unsecured notes outstanding and the Credit Facility (as defined below) and the related weighted average interest rates at December 31, 2014 are as follows (in thousands, except percentages):
													Weighted
			Mortgages										Average
			Principal		Principal		Unsecured		Credit				Interest
			Amortization		Maturities		Notes		Facility		Total		Rate
	2015		$	12,194	$	—	$	315,981	$	—	$	328,175	5.04	%
	2016		11,768		182,318		299,577		—		493,663		6.08	%
	2017		10,916		2,349		296,043		—		309,308		6.56	%
	2018		8,730		27,051		99,976		167,000		302,757		3.61	%
	2019		8,825		50,043		—		—		58,868		4	%
	2020		4,280		67,361		349,524		—		421,165		4.83	%
	2021		2,716		65,008		—		—		67,724		4.06	%
	2022		2,211		—		399,419		—		401,630		4.13	%
	2023		2,319		—		299,766		—		302,085		3.39	%
	2024 and thereafter		27,266		1,946		448,808		—		478,020		4.43	%
			$	91,225	$	396,076	$	2,509,094	$	167,000	$	3,163,395	4.78	%
	Mortgage Loans, Unsecured Notes
	Mortgage loans with maturities ranging from 2016 to 2033 are collateralized by and in some instances cross-collateralized by properties with a net book value of $908.5 million as of December 31, 2014.
	The interest rates on $2,980.4 million of mortgage loans (including $103.6 million fixed via a swap arrangement - see Footnote 21 - Derivative Instruments) and unsecured notes are fixed and range from 3.0% to 7.5%. The weighted average remaining term for the mortgage loans and unsecured notes is 5.4 years.
	Credit Facility
	The Company has maintained an unsecured credit facility throughout 2012, 2013 and 2014. During that period the Company has replaced, restated and amended its credit facility. This activity has resulted in changes to borrowing capacity, due dates, borrowing costs and covenant calculations. As replaced, restated and amended these credit facilities are referred to below as the "Credit Facility." The interest rate on borrowings under the Credit Facility fluctuates based upon ratings from Moody’s Investors Service, Inc., Standard and Poor’s Ratings Group and Fitch, Inc. Based on the Company's ratings as of December 31, 2014, borrowings under the Credit Facility would bear interest at LIBOR plus 105 basis points. The Credit Facility expires in March 2018 and has two six-month extensions at the Company's option, subject to the payment of a stated fee. The Credit Facility contains a competitive bid option, whereby participating lenders bid on the interest rate to be charged. This feature is available for up to 50% of the amount of the facility. There were $167.0 million of borrowings outstanding under the Credit Facility at December 31, 2014. There is also a 20 basis point annual facility fee on the current borrowing capacity. The Credit Facility contains financial covenants, certain of which are set forth below:
	•	total debt to total assets may not exceed 0.60:1;
	•	earnings before interest, taxes, depreciation and amortization to fixed charges may not be less than 1.50:1;
	•	unsecured debt to unencumbered asset value must equal or be less than 60%; and
	•	unencumbered net operating income to unsecured interest expense must equal or exceed 175%.
	Activity
	In February 2012, the Company closed on a mortgage with $45 million of available funds bearing interest at 4.84% and maturing in 2033. The net proceeds from this mortgage were used for construction costs on a property under development that was placed in service during the year ended December 31, 2013.
	In June 2012, the Company issued $400 million of 4.125% senior unsecured notes due 2022. The net proceeds from this issuance were used to repay borrowings under the Company's unsecured credit facility and for general corporate purposes.
	In August 2012, the Company used proceeds from its unsecured credit facility together with available cash on hand to repay $230.1 million of 10-year, 6.375% senior unsecured notes due August 2012.
	In December 2012, the Company issued $300 million of 3.375% senior unsecured notes due 2023. The net proceeds from this issuance were used to repay borrowings under the Company's unsecured credit facility and for general corporate purposes.
	In September 2013, the Company issued $450 million of 4.40% senior unsecured notes due 2024. The net proceeds from the offering were used to fund a portion of the cash consideration payable for the Cabot Acquisition (see Note 20).
	In October 2013, as part of the Cabot Acquisition, the Company assumed $229.8 million in mortgages bearing interest at a weighted average rate of 5.85% with maturity dates from 2018 to 2021.
	In March 2014, the Company replaced its existing $500 million Credit Facility with an $800 million Credit Facility.
	In August 2014, the Company used proceeds from its Credit Facility together with available cash on hand to repay its 5.65% senior unsecured notes due August 2014 in the amount of $200 million.

Leasing_Activity

Leasing Activity	12 Months Ended
	Dec. 31, 2014
Operating Leases, Future Minimum Payments Receivable [Abstract]
Operating Leases of Lessor Disclosure [Text Block]	LEASING ACTIVITY
	Future minimum rental payments due from tenants under noncancelable operating leases as of December 31, 2014 are as follows (in thousands):
	2015	$	540,996
	2016	486,016
	2017	400,297
	2018	330,906
	2019	258,777
	Thereafter	1,019,497
	Total	$	3,036,489
	In addition to minimum rental payments, most leases require the tenants to pay for their pro rata share of specified operating expenses. These payments are included as operating expense reimbursement in the accompanying consolidated statements of comprehensive income.

Noncontrolling_Interest_Operat

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract]
Noncontrolling Interest Disclosure [Text Block]	NONCONTROLLING INTEREST - OPERATING PARTNERSHIP / LIMITED PARTNERS' EQUITY - PREFERRED UNITS
	As of December 31, 2014, the Company had outstanding the following cumulative preferred units of the Operating Partnership:
	ISSUE	AMOUNT		UNITS	LIQUIDATION	DIVIDEND
					PREFERENCE	RATE
		(in 000’s)
	Series I-2	$	7,537	301	$25	6.25	%
	The preferred units are putable at the holder's option at any time and are callable at the Operating Partnership's option after a stated period of time for cash.
	Preferred distributions related to the Series I units were $472,000 for each of the years ended December 31, 2014, 2013 and 2012.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2014
Shareholders' Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	During the years ended December 31, 2014, 2013 and 2012, individuals acquired 3,000, 157,285 and 94,895 common shares, respectively, in exchange for the same number of common units. These individuals acquired these common units in connection with their contributions to the Operating Partnership of certain assets in prior years. The exchange of common shares for the common units is exempt from the registration requirement of the Securities Act of 1933, as amended, pursuant to Section 4(2) thereunder.
	During the years ended December 31, 2014, 2013 and 2012, distributions per common share were $1.90 for each period.
	SHAREHOLDERS' EQUITY - TRUST
	Common Shares
	The Company paid to holders of its common shares and holders of its common units distributions of $286.9 million, $247.4 million and $229.7 million during the years ended December 31, 2014, 2013 and 2012, respectively. On a per share basis, the Company paid common share and common unit distributions of $1.90 during each of the years ended December 31, 2014, 2013 and 2012.
	The following unaudited table summarizes the taxability of common share distributions (taxability for 2014 is estimated):
		2014			2013		2012
	Ordinary dividend	$	1.2556		$	1.4312	$	1.5036
	Capital gain - 20%	—			0.0016		—
	IRC Sec 1250 unrecapture gain - 25%	0.3712			0.4672		0.0164
	Return of capital	0.2732			—		0.38
	Total	$	1.9		$	1.9	$	1.9
	The Company's tax return for the year ended December 31, 2014 has not been filed. The taxability information presented for the 2014 distributions is based upon the best available data. The Company's prior federal income tax returns are subject to examination by taxing authorities. Because the application of tax laws and regulations is susceptible to varying interpretations, the taxability of distributions could be changed at a later date upon final determination by taxing authorities.
	Common units
	The common units of the Operating Partnership not held by the Trust outstanding as of December 31, 2014 have the same economic characteristics as common shares of the Trust. The 3,553,566 outstanding common units of the Operating Partnership not held by the Trust share proportionately in the net income or loss and in any distributions of the Operating Partnership. The common units of the Operating Partnership not held by the Trust are redeemable at any time at the option of the holder. The Trust, as the sole general partner of the Operating Partnership, may at its option elect to settle the redemption in cash or through the exchange on a one-for-one basis with unregistered common shares of the Trust. The market value of the 3,553,566 outstanding common units based on the closing price of the common shares of the Company at December 31, 2014 was $133.7 million.
	No common units were issued in connection with acquisitions during 2014, 2013 or 2012.
	Preferred units
	The Operating Partnership had no outstanding cumulative redeemable preferred units of the Operating Partnership as of December 31, 2014. During the year ended December 31, 2013, the Company redeemed or repurchased $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions and repurchases, the Company wrote off $1.2 million in origination costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	During the year ended December 31, 2012, the Company redeemed $32.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units for $26.0 million. Also, the Company redeemed $95.0 million of outstanding 7.45% Series B Cumulative Redeemable Preferred Units and $100.0 million of outstanding 7.40% Series H Cumulative Redeemable Preferred Units at par. In connection with these redemptions, during the year ended December 31, 2012, the Company recognized a $3.7 million net gain relating to the excess of preferred unit carrying amount over redemption price net of certain costs. This amount was included in noncontrolling interest - operating partnership in the Trust's consolidated statements of comprehensive income.
	The Company paid the following Equity Preferred Unit distributions for the years ended December 31:
		2013		2012
	Distributions (in millions)	$1.60		$9.90
	Distribution per unit:
	Series B	—		$0.45
	Series E	$1.21		$3.50
	Series F	$1.32		$1.43
	Series G	$1.33		$3.35
	Series H	—		$0.77
	As of December 31, 2014, the Company had 16,013,000 authorized but unissued preferred shares.
	Dividend Reinvestment and Share Purchase Plan
	The Company has a Dividend Reinvestment and Share Purchase Plan under which holders of common shares may elect to automatically reinvest their distributions in additional common shares and may make optional cash payments for additional common shares. The Company may issue additional common shares or repurchase common shares in the open market for purposes of satisfying its obligations under the Dividend Reinvestment and Share Purchase Plan. During the years ended December 31, 2014, 2013, and 2012, 1,643,536, 1,248,842, and 1,037,712 common shares, respectively, were issued through the Dividend Reinvestment and Share Purchase Plan. The Company used the proceeds to pay down outstanding borrowings under the Company's Credit Facility and for general corporate purposes.
	Continuous Equity Offering
	The Company has a continuous equity offering program in place for up to $200 million of equity. During the year ended December 31, 2013, the Company sold 1.9 million common shares through this program. The aggregate proceeds from the offering of $75.0 million were used to pay down outstanding borrowings under the Company's unsecured credit facility and for general corporate purposes. The Company did not sell any common shares pursuant to its continuous offering program during 2014 or 2012.
	Noncontrolling Interest - Consolidated Joint Ventures
	Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments.

Owners_Equity_Operating_Partne

Owners' Equity - Operating Partnership (Liberty Property Limited Partnership [Member])	12 Months Ended
	Dec. 31, 2014
Liberty Property Limited Partnership [Member]
Class of Stock [Line Items]
Partners' Capital Notes Disclosure [Text Block]	OWNERS' EQUITY - OPERATING PARTNERSHIP
	Common Units
	General and limited partners' equity - common units relates to limited partnership interests of the Operating Partnership issued in connection with the formation of the Operating Partnership and certain subsequent acquisitions. The common units outstanding as of December 31, 2014 have the same economic characteristics as common shares of the Trust. The 3,553,566 outstanding common units are the limited partners' equity - common units held by persons and entities other than the Trust, the general partner of the Operating Partnership, which holds a number of common units equal to the number of outstanding common shares of beneficial interest. Both the common units held by the Trust and the common units held by persons and entities other than the Trust are counted in the weighted average number of common units outstanding during any given period. The 3,553,566 outstanding common units share proportionately in the net income or loss and in any distributions of the Operating Partnership and are exchangeable into the same number of common shares of the Trust. The market value of the 3,553,566 outstanding common units at December 31, 2014 based on the closing price of the common shares of the Company at December 31, 2014 was $133.7 million.
	No common units were issued in connection with acquisitions during 2014, 2013 or 2012.
	Preferred Units
	The Operating Partnership had no outstanding cumulative redeemable preferred units of the Operating Partnership as of December 31, 2014. During the year ended December 31, 2013, the Company redeemed or repurchased $20.0 million of outstanding 7.00% Series E Cumulative Redeemable Preferred Units, $17.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units and $27.0 million of outstanding 6.70% Series G Cumulative Redeemable Preferred Units, all at par. In connection with these redemptions and repurchases, the Company wrote off $1.2 million in origination costs.
	During the year ended December 31, 2012, the Company redeemed $32.5 million of outstanding 6.65% Series F Cumulative Redeemable Preferred Units for $26.0 million. Also, the Company redeemed $95.0 million of outstanding 7.45% Series B Cumulative Redeemable Preferred Units and $100.0 million of outstanding 7.40% Series H Cumulative Redeemable Preferred Units at par. In connection with these redemptions, during the year ended December 31, 2012, the Company recognized a $3.7 million net gain relating to the excess of preferred unit carrying amount over redemption price net of certain costs.
	The Operating Partnership paid the following Equity Preferred Unit distributions for the years ended December 31:
		2013	2012
	Distributions (in millions)	$1.60	$9.90
	Distribution per unit:
	Series B	—	$0.45
	Series E	$1.21	$3.50
	Series F	$1.32	$1.43
	Series G	$1.33	$3.35
	Series H	—	$0.77
	Continuous Equity Offering
	The Company has a continuous equity offering program in place for up to $200 million of equity. During year ended December 31, 2013, the Company sold 1.9 million common shares through this program. The aggregate proceeds from the offering of $75.0 million were used to pay down outstanding borrowings under the Company's unsecured credit facility and for general corporate purposes. The Company did not sell any common shares pursuant to its continuous offering program during 2014 or 2012.
	Noncontrolling Interest - Consolidated Joint Ventures
	Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Employee Benefit Plans [Abstract]
Compensation and Employee Benefit Plans [Text Block]	EMPLOYEE BENEFIT PLANS
	The Company maintains a 401(k) plan for the benefit of its full-time employees. The Company matches the employees' contributions up to 3% of the employees' salary and may also make annual discretionary contributions. Total 401(k) expense recognized by the Company was $943,000, $923,000 and $865,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

Share_Based_Compensation

Share Based Compensation	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	During the years ended December 31, 2014, 2013 and 2012, 44,000, 504,000 and 841,000 common shares, respectively, were issued upon the exercise of options.
	SHARE-BASED COMPENSATION
	Compensation Plans
	The Company has a share-based compensation plan (the "Plan") which is utilized to compensate key employees and non-employee trustees. In addition, the Company has a 2008 Long-Term Incentive Plan (the "2008 Plan") which is applicable to the Company's executive officers. Pursuant to both the Plan and the 2008 Plan, grants of stock options, restricted shares and restricted stock units have been made. The Company has authorized the grant of shares and options under the Plan and the 2008 Plan of up to 21.1 million common shares of the Company.
	Options
	All options granted have a 10-year term and most options vest and are expensed over a 3-year period, with options to purchase up to 20% of the shares exercisable after the first anniversary, up to 50% after the second anniversary and 100% after the third anniversary of the date of grant.
	Share-based compensation cost related to options for the years ended December 31, 2014, 2013 and 2012 was $1.8 million, $1.6 million and $1.7 million, respectively.
	The fair value of share option awards is estimated on the date of the grant using the Black-Scholes option valuation model. The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	1.60%		1.10%	1.10%
	Dividend yield	5.20%		5.40%	5.70%
	Historical volatility factor	0.236		0.356	0.377
	Weighted-average expected life	6 years		6 years	5 years
	The historical volatility factor is based on the Company's historical monthly share prices. The weighted-average expected life is based on the contractual term of the options as well as the historical periods held before exercise.
	A summary of the Company's share option activity and related information for the year ended December 31, 2014 follows:
			Options (000s)		Weighted Average Exercise Price
	Outstanding January 1, 2014		2,355		$	36.9
	Granted		439		37.32
	Exercised		(44	)	30.66
	Forfeited		(258	)	42.69
	Outstanding December 31, 2014		2,492		$	36.48
	Exercisable at December 31, 2014		1,750		$	36.16
	The weighted average fair value of options granted during the years ended December 31, 2014, 2013 and 2012 was $4.09, $7.18 and $6.55, respectively. Exercise prices for options outstanding as of December 31, 2014 ranged from $20.32 to $49.74. At December 31, 2014, the weighted average remaining contractual life of the options outstanding and exercisable was 5.4 years and 4.0 years, respectively.
	During the years ended December 31, 2014, 2013 and 2012, the total intrinsic value of share options exercised (the difference between the market price at exercise and the price paid by the individual to exercise the option) was $310,000, $4.9 million and $5.9 million, respectively. As of December 31, 2014, 565,000 of the options outstanding and exercisable had an exercise price higher than the closing price of the Company's common shares and are considered to have no intrinsic value at that date. As of December 31, 2014, 1.2 million options outstanding and exercisable had an exercise price lower than the closing price of the Company's common shares. The aggregate intrinsic value of these options was $6.8 million at that date. The total cash received from the exercise of options for the years ended December 31, 2014, 2013 and 2012 was $1.4 million, $15.2 million and $22.9 million, respectively. The Company has historically issued new shares to satisfy share option exercises.
	As of December 31, 2014, there was $324,000 of unrecognized compensation costs related to nonvested options granted under the Plan. That cost is expected to be recognized over a weighted average period of 0.8 years.
	Long Term Incentive Shares ("LTI")
	Restricted LTI share grants made under the Plan are valued at the grant date fair value, which is the market price of the underlying common shares, and vest ratably over a 5-year period beginning with the first anniversary of the grant.
	During 2014, 2013 and 2012, the Company granted restricted stock units to the executive officers pursuant to the 2008 Plan. For the chief executive officer's award, a portion of the restricted stock units will vest up to 272% at the end of a 3-year period for the 2014, 2013 and 2012 awards. For the other executives, a portion of the restricted stock units will vest up to 200% at the end of a 3-year period for the 2014, 2013 and 2012 awards. A portion ("First Portion") of the award vests based on whether the Company's total return exceeds the average total returns of a selected group of peer companies. The grant date fair value of the First Portion was calculated based on a Monte Carlo simulation model and was determined to be 157%, 150% and 159% of the market value of a common share as of the grant date ("Market Value") for the chief executive officer and 125%, 121% and 127% of the Market Value for the other executives for the 2014, 2013 and 2012 grants, respectively. The First Portion is amortized over the respective 3-year period subject to certain accelerated vesting due to the age and years of service of certain executive officers. Another portion ("Second Portion") of the award vests based on the Company's Funds from operations. Targets are established for each of the 3 years in the relevant award period. Depending on how each year's performance compares to the projected performance for that year, the restricted stock units are deemed earned and will vest at the end of the award period. The fair value of the Second Portion is based on the market value of a common share as of the grant date and is being amortized to expense during the period from grant date to the vesting dates, adjusting for the expected level of vesting that is anticipated to occur at those dates also subject to certain accelerated vesting provisions as described above.
	The key assumptions used in the Monte Carlo simulation are as follows:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	0.68%		0.35%	0.52%
	Volatility	24%		26%	41%
	The volatility factor is based on the Company's historical daily share prices.
	Share-based compensation cost related to restricted LTI share grants for the years ended December 31, 2014, 2013 and 2012 were $9.0 million, $9.1 million and $8.7 million, respectively.
	The Company's restricted LTI share activity for the year ended December 31, 2014 is as follows:
			Shares (000s)		Weighted Avg. Grant Date Fair value
	Nonvested at January 1, 2014		786		$	35.37
	Granted		263		37.13
	Vested		(282	)	32.93
	Forfeited		(14	)	36.19
	Nonvested at December 31, 2014		753		$	36.89
	The weighted average fair value of restricted shares granted during the years ended December 31, 2014, 2013 and 2012 was $37.13, $39.42 and $34.61 per share, respectively. As of December 31, 2014, there was $12.5 million of total unrecognized compensation cost related to nonvested shares granted under the Plan. That cost is expected to be recognized over a weighted average period of 1.4 years. The total fair value of restricted shares vested during the years ended December 31, 2014, 2013 and 2012 was $9.3 million, $9.9 million and $8.7 million, respectively.
	Bonus Shares
	The Plan provides that employees of the Company may elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee receives shares equal to 120% of the cash value of the bonus or commission, less applicable withholding tax. Bonus Shares issued for the years ended December 31, 2014, 2013 and 2012 were 103,834, 79,271 and 80,573, respectively. Share-based compensation cost related to Bonus Shares for the years ended December 31, 2014, 2013 and 2012 was $3.9 million, $3.1 million and $2.9 million, respectively.
	Profit Sharing Plan
	The Plan provides that employees of the Company, below the officer level, may receive up to 5% of base pay in the form of cash contributions to an investment account depending on Company performance. Compensation cost related to the profit sharing plan for the years ended December 31, 2014, 2013 and 2012 was $543,000, $698,000 and $564,000 respectively.
	An additional 6,100,098, 6,637,761 and 7,156,179 common shares were reserved for issuance for future grants under the Plan and the 2008 Plan at December 31, 2014, 2013 and 2012, respectively.
	Employee Share Purchase Plan
	The Company registered 750,000 common shares under the Securities Act of 1933, as amended, in connection with an employee share purchase plan ("ESPP"). The ESPP enables eligible employees to purchase shares of the Company, in amounts up to 10% of the employee's salary, at a 15% discount to fair market value. There were 12,612, 16,793 and 18,611 shares issued, in accordance with the ESPP, during the years ended December 31, 2014, 2013 and 2012, respectively. Share-based compensation cost related to the ESPP for the years ended December 31, 2014, 2013 and 2012 was $104,000, $71,000 and $99,000, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Environmental Matters
	Substantially all of the Company's properties and land were subject to Phase I Environmental Assessments and when appropriate Phase II Environmental Assessments (collectively, the “Environmental Assessments”) obtained in contemplation of their acquisition by the Company or obtained by predecessor owners prior to the sale of the property or land to the Company. The Environmental Assessments did not reveal, nor is the Company aware of, any non-compliance with environmental laws, environmental liability or other environmental claim that the Company believes would likely have a material adverse effect on the Company.
	Operating Ground Lease Agreements
	Future minimum rental payments under the terms of all non-cancelable operating ground leases under which the Company is the lessee, as of December 31, 2014, were as follows (in thousands):
	Year	Amount
	2015	$	668
	2016	687
	2017	687
	2018	687
	2019	687
	2020 though 2034	6,608
	Total	$	10,024
	Operating ground lease expense incurred by the Company during the years December 31, 2014, 2013 and 2012 totaled $454,000, $210,000 and $162,000, respectively.
	Legal Matters
	From time to time, the Company is a party to a variety of legal proceedings, claims and assessments arising in the normal course of business. The Company believes that as of December 31, 2014 there were no legal proceedings, claims or assessments expected to have a material adverse effect on the Company’s business or financial statements.
	Other
	As of December 31, 2014, the Company had letter of credit obligations of $4.2 million related to development requirements. The Company believes that it is remote that there will be a draw upon these letter of credit obligations.
	As of December 31, 2014, the Company had 25 buildings under development. These buildings are expected to contain a total of 4.3 million square feet of leaseable space and represent an anticipated aggregate investment of $465.1 million. At December 31, 2014, Development in Progress totaled $277.4 million. In addition, as of December 31, 2014, the Company had invested $8.0 million in deferred leasing costs related to these development buildings.
	As of December 31, 2014, the Company was committed to $19.4 million in improvements on certain buildings and land parcels.
	As of December 31, 2014, the Company was obligated to pay for tenant improvements not yet completed for a maximum of $40.9 million.
	As of December 31, 2014, the Company was committed to $41.3 million in future land purchases.
	The Company maintains cash and cash equivalents at financial institutions. The combined account balances at each institution typically exceed FDIC insurance coverage and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of FDIC insurance coverage. The Company believes the risk is not significant.

Quarterly_Results_of_Operation

Quarterly Results of Operations	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
	A summary of quarterly results of operations for the years ended December 31, 2014 and 2013 follows. Certain amounts have been reclassified to conform to the current presentation of discontinued operations (in thousands, except per share amounts).
			QUARTER ENDED
			DEC. 31,			SEPT. 30,		JUNE 30,		MAR. 31,		DEC. 31,		SEPT. 30,		JUNE 30,		MAR. 31,
			2014			2014		2014		2014		2013		2013		2013		2013
	Operating revenue		$	203,685		$	198,356	$	192,960	$	197,630	$	192,427	$	155,349	$	151,026	$	147,128
	Income from continuing operations		84,193		-2	35,318		29,811		26,260		19,911		23,406		29,611		24,827
	Discontinued operations		306			133		296		47,846		51,832		6,544		13,633		49,830
	Net income		84,499			35,451		30,107		74,106		71,743		29,950		43,244		74,657
	Income per common share - basic (1)		0.56			0.23		0.2		0.49		0.48		0.21		0.33		0.6
	Income per common share - diluted (1)		0.55			0.23		0.2		0.49		0.48		0.21		0.33		0.6
	-1	The sum of quarterly financial data may vary from the annual data due to rounding.
	-2	Includes gain on sale of $43.2 million.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	SEGMENT INFORMATION
	The Company owns and operates industrial properties nationally and owns and operates office properties in a focused group of office markets. Additionally, the Company owns certain assets in the United Kingdom. During the year ended December 31, 2014, the Company realigned its reportable segments as follows.
	•	Carolinas;
	•	Chicago/Milwaukee;
	•	Houston;
	•	Lehigh/Central PA;
	•	Minnesota;
	•	Orlando;
	•	Philadelphia;
	•	Richmond/Hampton Roads;
	•	Southeastern PA;
	•	South Florida;
	•	Tampa;
	•	United Kingdom.
	Certain other segments are aggregated into an "Other" category which includes the reportable segments: Arizona; Atlanta; Cincinnati/Columbus/Indianapolis; Dallas; Jacksonville; Maryland; New Jersey; Northern Virginia; Southern California; Washington D.C. and other.
	Comparative prior periods have been restated to reflect current segment disclosures.
	The Company evaluates the performance of its reportable segments based on net operating income. Net operating income includes operating revenue from external customers, real estate taxes, amortization of lease transaction costs and other operating expenses which relate directly to the management and operation of the assets within each reportable segment.
	The Company's accounting policies for the segments are the same as those used in the Company's consolidated financial statements. There are no material inter-segment transactions.
	The operating information by reportable segment is as follows (in thousands):
				Year ended
				December 31,
				2014				2013				2012
	Operating revenue
		Carolinas		$	35,870			$	30,243			$	28,667
		Chicago/Milwaukee		33,068				18,083				9,780
		Houston		49,309				37,773				30,172
		Lehigh/Central PA		118,145				101,101				96,804
		Minnesota		54,892				62,415				57,331
		Orlando		32,674				31,400				30,844
		Philadelphia		35,238				31,690				28,153
		Richmond/Hampton Roads		40,911				40,247				41,395
		South Florida		48,804				38,464				35,628
		Southeastern PA		148,714				165,248				169,645
		Tampa		53,725				52,230				46,627
		United Kingdom		16,360				7,669				4,690
		Other		130,013				142,402				117,562
	Segment-level operating revenue			797,723				758,965				697,298
	Reconciliation to total operating revenues
		Discontinued operations		(4,728		)		(113,586		)		(137,476		)
		Other		(364		)		551				457
	Total operating revenue			$	792,631			$	645,930			$	560,279
	Net operating income
		Carolinas		$	24,578			$	20,434			$	18,733
		Chicago/Milwaukee		20,856				11,726				5,329
		Houston		29,134				22,632				17,862
		Lehigh/Central PA		82,050				68,504				65,566
		Minnesota		26,464				30,016				26,348
		Orlando		21,472				20,506				20,153
		Philadelphia		26,722				23,587				20,527
		Richmond/Hampton Roads		24,357				24,063				24,762
		South Florida		27,947				20,943				18,921
		Southeastern PA		81,183				91,193				98,729
		Tampa		33,776				33,042				28,350
		United Kingdom		10,704				2,597				(257		)
		Other		83,991				81,435				64,207
	Segment-level net operating income			493,234				450,678				409,230
	Reconciliation to income from continuing operations
		Interest expense (1)		(152,444		)		(143,018		)		(123,146		)
		Depreciation/amortization expense (1) (2)		(177,715		)		(138,128		)		(104,643		)
		Gain on property dispositions		45,030				—				—
		Equity in earnings (loss) of unconsolidated joint ventures		10,314				6,067				(681		)
		General and administrative expense (1) (2)		(38,041		)		(50,998		)		(40,831		)
		Discontinued operations excluding gain on property dispositions		(1,950		)		(26,455		)		(38,578		)
		Income taxes (2)		(2,781		)		(2,748		)		(874		)
	Other		(65		)		2,357				(3,730		)
Income from continuing operations			$	175,582			$	97,755			$	96,747
(1) Includes activity on discontinued operations.
(2) Excludes costs which are included in determining segment-level net operating income.
The amount of depreciation and amortization expense related to tenant improvement and lease transaction costs within each reporting segment for the Net operating income calculation is as follows:
		Year ended
		December 31,
		2014				2013				2012
Carolinas		$	2,329			$	1,935			$	1,726
Chicago/Milwaukee		466				251				233
Houston		3,988				3,200				2,608
Lehigh/Central PA		10,157				9,781				9,753
Minnesota		4,478				5,797				5,132
Orlando		3,116				3,037				2,804
Philadelphia		1,803				1,729				1,724
Richmond/Hampton Roads		4,278				4,156				4,157
South Florida		2,824				2,979				3,083
Southeastern PA		12,272				15,040				14,109
Tampa		3,384				3,033				2,959
United Kingdom		177				172				269
Other		5,631				13,439				13,061
Depreciation and amortization of tenant improvement and lease transaction costs		$	54,903			$	64,549			$	61,618
The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2014, 2013 and 2012 is as follows (in thousands):
	Year Ended
	December 31, 2014												December 31, 2013							December 31, 2012
	Industrial				Office				Total				Industrial		Office		Total			Industrial		Office		Total
Carolinas	$	35,870			$	—			$	35,870			$	30,243	$	—	$	30,243		$	26,818	$	1,849	$	28,667
Chicago/Milwaukee	33,068				—				33,068				18,083		—		18,083			6,908		2,872		9,780
Houston	49,309				—				49,309				37,773		—		37,773			30,172		—		30,172
Lehigh/Central PA	115,821				2,324				118,145				98,715		2,386		101,101			94,440		2,364		96,804
Minnesota	25,378				29,514				54,892				32,043		30,372		62,415			27,810		29,521		57,331
Orlando	18,635				14,039				32,674				16,535		14,865		31,400			15,840		15,004		30,844
Philadelphia	10,072				25,166				35,238				9,534		22,156		31,690			8,356		19,797		28,153
Richmond/Hampton Roads	20,924				19,987				40,911				19,073		21,174		40,247			18,490		22,905		41,395
South Florida	18,603				30,201				48,804				7,955		30,509		38,464			5,213		30,415		35,628
Southeastern PA	28,895				119,819				148,714				27,076		138,172		165,248			28,604		141,041		169,645
Tampa	25,451				28,274				53,725				24,331		27,899		52,230			17,584		29,043		46,627
United Kingdom	13,090				3,270				16,360				4,205		3,464		7,669			1,307		3,383		4,690
Other (1)	82,672				47,341				130,013				43,355		99,047		142,402			28,268		89,294		117,562
	$	477,788			$	319,935			797,723				$	368,921	$	390,044	758,965			$	309,810	$	387,488	697,298
Reconciliation to total operating revenue
Discontinued operations									(4,728		)						(113,586		)					(137,476		)
Corporate Other									(364		)						551							457
Total operating revenue									$	792,631							$	645,930						$	560,279
-1	A substantial portion of the buildings contributing to office operating revenue in 2012 and 2013 were sold in conjunction with the Portfolio Sale. See Footnote 19.
The Company's total assets by reportable segment as of December 31, 2014 and 2013 is as follows (in thousands):
		As of December 31,
		2014				2013
Total assets
	Carolinas	$	325,690			$	257,230
	Chicago/Milwaukee	422,531				413,585
	Houston	418,154				380,248
	Lehigh/Central PA	1,023,641				938,824
	Minnesota	333,506				335,613
	Orlando	160,899				253,888
	Philadelphia	366,577				316,810
	Richmond/Hampton Roads	250,205				250,008
	South Florida	400,034				380,138
	Southeastern PA	698,163				695,966
	Tampa	335,652				337,301
	United Kingdom	231,276				247,537
	Other	1,553,250				1,735,392
Segment-level total assets		6,519,578				6,542,540
	Corporate Other	105,958				233,020
Total assets		$	6,625,536			$	6,775,560
The Company's real estate assets by reportable segment as of December 31, 2014 and 2013 is as follows (in thousands):
		As of December 31,
		2014				2013
Real estate assets
	Carolinas	$	309,822			$	245,938
	Chicago/Milwaukee	383,494				371,149
	Houston	398,080				360,779
	Lehigh/Central PA	958,886				877,969
	Minnesota	307,970				308,272
	Orlando	139,218				228,182
	Philadelphia	255,313				229,769
	Richmond/Hampton Roads	238,670				238,129
	South Florida	378,398				358,492
	Southeastern PA	636,280				630,460
	Tampa	317,106				320,495
	United Kingdom	182,588				187,699
	Other	1,391,744				1,300,915
Total real estate assets		$	5,897,569			$	5,658,248
The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		Year Ended December 31,
		2014				2013				2012
Costs incurred on long-lived assets
	Carolinas	$	72,252			$	15,582			$	26,860
	Chicago/Milwaukee	21,698				248,640				49,941
	Houston	70,903				116,024				46,003
	Lehigh/Central PA	105,725				161,925				86,245
	Minnesota	28,966				38,434				41,821
	Orlando	7,827				10,953				10,122
	Philadelphia	32,012				17,941				93,673
	Richmond/Hampton Roads	10,348				15,880				8,612
	South Florida	30,063				148,165				3,337
	Southeastern PA	39,638				39,590				11,577
	Tampa	7,262				28,655				74,304
	United Kingdom	16,298				155,829				6,110
	Other	172,495				897,831				53,412
Total costs incurred on long-lived assets		$	615,487			$	1,895,449			$	512,017

Accounting_for_the_Impairment_

Accounting for the Impairment or Disposal of Long-Lived Assets	12 Months Ended
	Dec. 31, 2014
Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	ACCOUNTING FOR THE IMPAIRMENT OR DISPOSAL OF LONG-LIVED ASSETS
	In November 2013, the Company entered into an Agreement of Sale and Purchase pursuant to which the Company agreed to sell 97 operating properties containing an aggregate of 6.6 million square feet and 159 acres of land for $697.3 million (the "Portfolio Sale"). In December 2013, the Company closed on the first of two planned settlements under this agreement. The proceeds from the first settlement were $367.7 million and included 49 properties totaling approximately 4.0 million square feet of space and 140 acres of land. In January 2014, the Company closed on the remaining settlement for proceeds of $329.6 million which consisted of 23 properties totaling 1.4 million square feet and 19 acres of land in the Maryland reportable segment, 24 properties and 1.2 million square feet in the New Jersey reportable segment and one property totaling 37,000 square feet in the Company's Southeastern PA reportable segment. All of the operating properties in the Portfolio Sale were considered held for sale as of December 31, 2013.
	Prior to the adoption of ASU 2014-08 on January 1, 2014, the results of operations for all operating properties sold or held for sale during the reported periods were shown under discontinued operations on the consolidated statements of comprehensive income. Under ASU 2014-08, operating properties that were sold or classified as held for sale before the adoption of ASU 2014-08 continue to be classified as discontinued operations. Accordingly, operating properties previously reported as discontinued operations (including the Portfolio Sale) will continue to be presented as discontinued operations on the consolidated statements of comprehensive income for all periods presented. The proceeds from the disposition of properties excluding the Portfolio Sale that were included in discontinued operations were $136.7 million and $228.5 million for the years ended December 31, 2013 and 2012, respectively.
	A summary of the results of operations for the properties classified as discontinued operations through the respective disposition dates is as follows (in thousands):
		For the Year Ended December 31,
		2014			2013			2012
	Revenues	$	4,728		$	113,586		$	137,476
	Operating expenses	(2,258		)	(41,875		)	(48,956		)
	Interest and other income	37			213			580
	Interest expense	(557		)	(15,903		)	(19,783		)
	Depreciation and amortization	—			(29,566		)	(30,739		)
	Income before gain on property dispositions	1,950			26,455			38,578
	Gain on property dispositions	46,631			95,384			12,426
	Net income	$	48,581		$	121,839		$	51,004
	Interest expense has been allocated to discontinued operations. The allocation of interest expense to discontinued operations was based on the ratio of net assets sold and held for sale (without continuing involvement) to the sum of total net assets plus consolidated debt.
	One property totaling 83,000 square feet in the Company’s Southeastern PA reportable segment was considered held for sale as of December 31, 2014. Under ASU 2014-08, this property has not been classified as discontinued operations.
Asset Impairment Charges [Text Block]	Asset Impairment
	During the years ended December 31, 2014, 2013 and 2012, the Company recognized impairment losses of $0.1 million, $1.9 million and $6.9 million, respectively. The impairment losses are for operating properties or land parcels and were in the reportable segments and for the amounts as indicated below (amounts in thousands):
			Year Ended December 31,
	Reportable Segment		2014			2013			2012
	Carolinas		$	—		$	—		$	36
	Chicago/Milwaukee		—			—			514
	Richmond/Hampton Roads		—			—			27
	South Florida		—			—			(51		)	(1)
	Southeastern PA		106						1,699
	Tampa		—			248			—
	United Kingdom		—			784			4,597
	Other		11			872			29
	Total		$	117		$	1,904		$	6,851
	-1	Represents recovery of estimated sales costs on properties sold.
	For the year ended December 31, 2014, $0.1 million in impairments related to properties sold or held for sale were included in the caption gain on property dispositions in the Company's consolidated statements of comprehensive income. For the year ended December 31, 2013, $0.9 million in impairments related to properties sold were included in the caption discontinued operations in the Company's consolidated statements of comprehensive income, $0.2 million in impairments related to land parcels sold were included in the caption gain on property dispositions in the Company's consolidated statements of comprehensive income and $0.8 million in impairment was included in the caption equity in earnings (loss) of unconsolidated joint ventures in the Company's consolidated statements of comprehensive income. For the year ended December 31, 2012, $2.3 million in impairment related to properties sold was included in the caption discontinued operations in the Company's consolidated statements of comprehensive income and $4.6 million in impairment was included in the caption equity in earnings (loss) of unconsolidated joint ventures in the Company's consolidated statements of comprehensive income. The Company determined these impairments through a comparison of the aggregate future cash flows (including quoted offer prices, a Level 1 input according to the fair value hierarchy established in ASC 820) to be generated by the properties to the carrying value of the properties. The Company has evaluated each of the properties and land held for development and has determined that there are no additional valuation adjustments necessary at December 31, 2014.

Business_Combination

Business Combination	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Business Combination	BUSINESS COMBINATION
	On October 8, 2013, the Company acquired all of the outstanding general and limited partnership interests of Cabot Industrial Fund III Operating Partnership, L.P., a Delaware limited partnership (the "Cabot Acquisition"). The acquisition resulted in the purchase of a 100% ownership interest in 177 industrial assets totaling approximately 23.0 million square feet. The purchase price for the Cabot Acquisition was $1.469 billion, which was paid through the assumption of approximately $229.8 million of mortgage debt and the remainder in cash. The Company funded the cash portion of the acquisition consideration through a combination of proceeds from an August 2013 equity offering, proceeds from a September 2013 offering of senior notes and draws under its Credit Facility.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date.
	Assets
	Real estate:
	Land and land improvements	$	247,393
	Building and improvements	1,152,717
	Operating real estate	1,400,110
	Intangible - in-place leases/market rent	97,396
	Other assets	4,953
	Total assets	1,502,459
	Liabilities
	Mortgage loans	243,230
	Other liabilities	32,958
	Intangible - market rent	5,737
	Total liabilities	281,925
	Net assets acquired	$	1,220,534
	The weighted average amortization period of the in-place lease intangibles is 4.4 years.
	Costs incurred in conjunction with the Cabot Acquisition and related funding include the following:
	•	$7.6 million of acquisition costs in the year ended December 31, 2013 (included in general and administrative expenses on the Company’s consolidated statements of comprehensive income) and $4.2 million in financing fees in the year ended December 31, 2013 (included in interest expense in the Company’s consolidated statements of comprehensive income).
	•	Deferred financing costs of approximately $2.0 million associated with the assumption of $229.8 million in mortgage debt ($243.2 million fair value) assumed at closing.
	•	Deferred financing costs of $3.9 million incurred in conjunction with the financing of the September 27, 2013 $450.0 million senior unsecured notes offering (included in deferred financing and leasing costs in the Company’s consolidated balance sheets with amortization reflected in interest expense over the life of the related notes in the Company’s consolidated statements of comprehensive income).
	•	Costs of $35.3 million incurred in conjunction with the August 7, 2013 issuance of 24.2 million of the Company’s common shares (included as a reduction to equity in the Company’s consolidated balance sheets).
	The Company recognized $31.4 million of operating revenue and $22.0 million of net operating income (see description of net operating income in Footnote 18 - Segment Information) related to the properties acquired in the Cabot Acquisition during 2013.
	The following unaudited pro forma condensed income statement information has been prepared as if the Cabot Acquisition, the Trust’s August 2013 common share offering and the Operating Partnership’s September 2013 senior note offering had been completed on January 1, 2012. The pro forma condensed consolidated financial information does not purport to represent what the Company’s results of operations would have been assuming the completion of the Cabot Acquisition and the related financing activities had occurred on January 1, 2012 nor do they purport to project the results of operations of the Company for any future period (in thousands):
			For the Year Ended
			December 31,
			2013		2012
	Total operating revenue		$	750,896	$	692,583
	Net income available to common shareholders		$	211,601	$	134,295
	These amounts have been calculated after applying the Company's accounting policies and adjusting the results of the Cabot Acquisition to reflect the additional depreciation and amortization that would have been charged assuming the fair value adjustments to building and improvements and in-place lease intangibles had been applied on January 1, 2012.

Derivative_Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS
	In connection with the Cabot acquisition, the Company assumed the seller’s interest in three interest rate swap contracts (“Swaps”) that eliminate the impact of changes in interest rates on the payments required under variable rate mortgages that were also assumed. The Swaps had an aggregate notional amounts of $103.6 million and $105.2 million at December 31, 2014 and 2013, respectively, and expire at various dates between 2018 and 2020.
	The Company designated the Swaps as cash flow hedges on November 22, 2013. The change in the fair value of the Swaps from October 8, 2013 through November 22, 2013 in the amount of $813,000 is included as an increase in interest expense in the accompanying consolidated statements of comprehensive income. From November 22, 2013 through December 31, 2013, the effective portion of the change in the fair value of the Swaps was an increase in the amount of $1.6 million and was recorded as an increase to other comprehensive (loss) income. For the year ended December 31, 2014, the effective portion of the change in the fair value of the Swaps was a decrease in the amount of $3.4 million which was recorded as a decrease in other comprehensive (loss) income. These amounts reported in accumulated other comprehensive (loss) income will be reclassified to interest expense as interest payments are made on the variable rate mortgages. The amount of loss reclassified from accumulated other comprehensive (loss) income was $1.5 million for the year ended December 31, 2014. The ineffective portion of the change in the fair value of the Swaps from November 22, 2013 through December 31, 2013 in the amount of $266,000 was recorded as a reduction of interest expense in the accompanying consolidated statements of comprehensive income. The ineffective portion of the change in the fair value of the Swaps for the year ended December 31, 2014 in the amount of $82,000 was recorded as an increase to interest expense in the accompanying consolidated statements of comprehensive income.
	The fair value of the interest rate swaps in the amount of $8.5 million and $8.4 million as of December 31, 2014 and 2013, respectively, is included in other liabilities in the accompanying consolidated balance sheets. The Company estimates that $1.2 million will be reclassified from accumulated other comprehensive income as an increase to interest expense over the next twelve months.
	The Company has agreements with its derivative counterparties that contain a provision whereby if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. If the Company were to breach any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value including accrued interest for approximately $8.5 million.

Supplemental_Disclosure_to_Sta

Supplemental Disclosure to Statements of Cash Flows	12 Months Ended
	Dec. 31, 2014
Supplemental Disclosure to Statements of Cash Flows [Abstract]
Supplemental Disclosure to Statements of Cash Flows	SUPPLEMENTAL DISCLOSURE TO STATEMENT OF CASH FLOWS
	The following are supplemental disclosures to the statements of cash flows for the years ended December 31, 2014, 2013 and 2012 (amounts in thousands):
		2014			2013		2012
	Write-off of fully depreciated/amortized property and deferred costs	$	38,131		$	22,269	$	31,069
	Write-off of depreciated property and deferred costs due to sale	173,083			202,695		106,698
	Write-off of preferred units costs due to redemption	—			1,214		2,806
	Assumption of mortgage loans in connection with the acquisition of properties	—			229,751		12,537
	Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity	(11,948		)	—		—
	Changes in accrued development capital expenditures	6,264			17,053		2,297
	Unrealized (loss) gain on cash flow hedge	(3,419		)	1,584		—
	Amounts paid in cash for deferred leasing costs incurred in connection with signed leases with tenants are paid in conjunction with improving (acquiring) property, plant and equipment. Such costs are not contained within net real estate. However, they are integral to the completion of a tenant lease and ultimately are related to the improvement and thus the value of the Company’s property, plant and equipment. They are therefore included in investing activities in the Company’s consolidated statements of cash flows.

Schedule_II

Schedule II	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	The following table details the activity for the allowance for doubtful accounts.
		Balance at December 31, 2013		Additions		Deductions			Balance at December 31, 2014
	Allowance for Doubtful Accounts - Straight Line Rent	$	823	$	1,097	$	(1,010	)	$	910
	Allowance for Doubtful Accounts - Accounts Receivable	6,938		3,886		(4,334		)	6,490
	Total	$	7,761	$	4,983	$	(5,344	)	$	7,400
		Balance at December 31, 2012		Additions		Deductions			Balance at December 31, 2013
	Allowance for Doubtful Accounts - Straight Line Rent	$	798	$	815	$	(790	)	$	823
	Allowance for Doubtful Accounts - Accounts Receivable	6,216		2,505		(1,783		)	6,938
	Total	$	7,014	$	3,320	$	(2,573	)	$	7,761
		Balance at December 31, 2011		Additions		Deductions			Balance at December 31, 2012
	Allowance for Doubtful Accounts - Straight Line Rent	$	1,311	$	350	$	(863	)	$	798
	Allowance for Doubtful Accounts - Accounts Receivable	6,142		2,462		(2,388		)	6,216
	Total	$	7,453	$	2,812	$	(3,251	)	$	7,014

Schedule_III

Schedule III	12 Months Ended
	Dec. 31, 2014
Schedule III [Abstract]
Real Estate and Accumulated Depreciation Disclosure [Text Block]
	LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
	SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
	AS OF DECEMBER 31, 2014
							Initial Cost								Gross Amount Carried at End of Period
	Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
	OPERATING PROPERTIES
	1467 Perryman Road	Aberdeen, MD		$	—		$	12,052,635		$	—	$	35,325,281		$	12,334,030	$	35,043,886	$	47,377,916	$	422,091	2014	May-40
	1501 Perryman Road	Aberdeen, MD		—			5,813,324			18,874,059		5,355,385			5,816,839		24,225,929		30,042,768		5,166,945		2005	May-40
	869 S Route 53	Addison, IL		—			1,194,223			4,201,881		81,639			1,194,223		4,283,521		5,477,744		163,088		2013	May-40
	901 S Route 53	Addison, IL		—			2,055,066			5,984,093		331,843			2,055,066		6,315,936		8,371,002		243,610		2013	May-40
	200 Boulder Drive	Allentown, PA		—			4,722,683			18,922,645		620,045			4,722,683		19,542,690		24,265,373		5,189,398		2004	May-40
	250 Boulder Drive	Allentown, PA		—			3,599,936			12,099,145		2,149,322			3,717,733		14,130,670		17,848,403		4,208,971		2004	May-40
	400 Nestle Way	Allentown, PA		—			8,065,500			—		27,612,516			8,184,096		27,493,920		35,678,016		13,473,371		1997	May-40
	650 Boulder Drive	Allentown, PA		—		*	5,208,248			—		31,999,219			9,961,788		27,245,679		37,207,467		8,276,803		2002	May-40
	651 Boulder Drive	Allentown, PA		—			4,308,646			—		17,689,842			4,308,646		17,689,842		21,998,488		7,349,337		2000	May-40
	700 Nestle Way	Allentown, PA		—		*	3,473,120			—		20,186,320			4,174,970		19,484,470		23,659,440		9,474,166		1998	May-40
	705 Boulder Drive	Allentown, PA		—		*	10,594,027			—		28,536,883			10,596,767		28,534,143		39,130,910		10,949,295		2001	May-40
	7165 Ambassador Drive	Allentown, PA		—		*	792,999			—		4,594,584			804,848		4,582,735		5,387,583		1,735,546		2002	May-40
	7248 Industrial Boulevard	Allentown, PA		—			2,670,849			13,307,408		4,536,663			2,670,673		17,844,247		20,514,920		7,872,299		1988	May-40
	7339 Industrial Boulevard	Allentown, PA		—			1,187,776			—		7,592,257			1,197,447		7,582,586		8,780,033		3,389,185		1996	May-40
	7437 Industrial Boulevard	Allentown, PA		—			717,488			5,022,413		3,376,237			726,651		8,389,486		9,116,137		4,726,618		1976	May-40
	8014 Industrial Boulevard	Allentown, PA		—		*	4,019,258			—		9,900,523			3,645,117		10,274,664		13,919,781		4,646,042		1999	May-40
	8150 Industrial Boulevard	Allentown, PA		—			2,564,167			—		8,919,967			2,571,466		8,912,668		11,484,134		2,887,452		2002	May-40
	8250 Industrial Boulevard	Allentown, PA		—		*	1,025,667			—		5,010,938			1,035,854		5,000,751		6,036,605		1,557,249		2002	May-40
	8400 Industrial Boulevard	Allentown, PA		—			6,725,948			—		27,161,555			7,521,211		26,366,292		33,887,503		6,109,054		2005	May-40
	6330 Hedgewood Drive	Allentown, PA		—			531,268			—		5,572,086			532,047		5,571,307		6,103,354		3,457,545		1988	May-40
	6350 Hedgewood Drive	Allentown, PA		—			360,027			—		4,028,297			560,691		3,827,633		4,388,324		2,275,548		1989	May-40
	6370 Hedgewood Drive	Allentown, PA		—			540,795			—		3,959,133			541,459		3,958,469		4,499,928		2,151,166		1990	May-40
	6390 Hedgewood Drive	Allentown, PA		—			707,203			—		3,000,621			707,867		2,999,957		3,707,824		1,725,562		1990	May-40
	6520 Stonegate Drive	Allentown, PA		—			453,315			—		1,712,509			484,361		1,681,463		2,165,824		944,248		1996	May-40
	6540 Stonegate Drive	Allentown, PA		—			422,042			—		4,012,192			422,730		4,011,504		4,434,234		2,648,926		1988	May-40
	6560 Stonegate Drive	Allentown, PA		—			458,281			—		2,805,111			458,945		2,804,447		3,263,392		1,906,340		1989	May-40
	6580 Snowdrift Road	Allentown, PA		—			388,328			—		4,782,863			389,081		4,782,110		5,171,191		2,636,788		1988	May-40
	7620 Cetronia Road	Allentown, PA		—			1,091,806			3,851,456		258,140			1,093,724		4,107,678		5,201,402		2,031,249		1990	May-40
	LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
	SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
	AS OF DECEMBER 31, 2014
							Initial Cost								Gross Amount Carried at End of Period
	Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
	OPERATING PROPERTIES
	3095 Presidential Drive	Atlanta, GA		—			200,351			1,729,161		197,738			200,351		1,926,899		2,127,250		78,787		2013	May-40
	3097 Presidential Drive	Atlanta, GA		—			188,680			1,721,048		83,383			188,680		1,804,431		1,993,111		88,681		2013	May-40
	7030 Buford Highway NE	Atlanta, GA		—		*	919,850			4,051,340		620,926			919,850		4,672,266		5,592,116		228,707		2013	May-40
	Barton 150	Barton Under Needwood, UK		—			2,196,955			13,643,981		(935,703		)	2,067,184		12,838,049		14,905,233		461,655		2013	May-40
	1055-1071 Kingsland Drive	Batavia, IL		—			727,294			2,367,529		158,908			727,294		2,526,437		3,253,731		119,118		2013	May-40
	4606 Richlynn Drive	Belcamp, MD		—			299,600			1,818,861		712,788			299,600		2,531,649		2,831,249		977,674		1985	May-40
	11800 Baltimore Avenue	Beltsville,MD		—		*	2,769,962			1,829,028		232,241			2,769,962		2,061,270		4,831,232		111,856		2013	May-40
	11850 Baltimore Avenue	Beltsville,MD		—		*	3,595,044			2,415,132		272,977			3,595,044		2,688,109		6,283,153		180,373		2013	May-40
	11900 Baltimore Avenue	Beltsville,MD		—		*	3,492,036			2,024,038		447,214			3,492,036		2,471,252		5,963,288		184,955		2013	May-40
	12104 Indian Creek Court	Beltsville,MD		—		*	2,021,752			2,503,802		391,474			2,021,752		2,895,276		4,917,028		212,784		2013	May-40
	12140 Indian Creek Court	Beltsville,MD		—		*	1,196,726			1,949,555		118,870			1,196,726		2,068,424		3,265,150		89,485		2013	May-40
	12200 Indian Creek Court	Beltsville,MD		—		*	1,347,882			1,460,291		216,607			1,347,882		1,676,898		3,024,780		71,156		2013	May-40
	12240 Indian Creek Court	Beltsville,MD		—		*	1,479,307			2,159,997		253,923			1,479,307		2,413,921		3,893,228		101,243		2013	May-40
	1071 Thorndale Avenue	Bensenville,IL		—			2,173,006			2,280,788		234,091			2,173,006		2,514,879		4,687,885		154,631		2013	May-40
	1260-1274 Ellis Street	Bensenville,IL		—		*	2,298,560			4,020,382		358,604			2,298,560		4,378,986		6,677,546		229,722		2013	May-40
	371-377 Meyer Road	Bensenville,IL		—		*	1,903,423			3,563,953		300,151			1,903,423		3,864,104		5,767,527		199,086		2013	May-40
	850-880 Devon Ave	Bensenville,IL		—		*	2,958,756			7,959,013		564,918			2,958,756		8,523,931		11,482,687		402,589		2013	May-40
	10 Emery Street	Bethlehem, PA		—			5,591,216			32,941,818		3,354,111			8,945,327		32,941,818		41,887,145		34,885		2014	May-40
	2785 Commerce Center Boulevard	Bethlehem, PA		—			11,961,623			—		46,473,202			12,009,985		46,424,840		58,434,825		1,713,528		2011	May-40
	74 West Broad Street	Bethlehem, PA		—			1,096,127			—		14,432,830			1,099,079		14,429,878		15,528,957		6,235,792		2002	May-40
	10801 Nesbitt Avenue South	Bloomington, MN		—			784,577			—		5,010,219			786,382		5,008,414		5,794,796		1,620,711		2001	May-40
	5705 Old Shakopee Road	Bloomington, MN		—			2,113,223			—		6,052,334			2,148,571		6,016,986		8,165,557		1,886,077		2001	May-40
	5715 Old Shakopee Road West	Bloomington, MN		—			1,263,226			2,360,782		2,310,183			1,264,758		4,669,433		5,934,191		1,697,547		2002	May-40
5735 Old Shakopee Road West	Bloomington, MN		—			1,263,226			2,360,782		1,090,289			1,264,758		3,449,539		4,714,297		1,001,168		2002	May-40
5775 West Old Shakopee Road	Bloomington, MN		—			2,052,018			3,849,649		1,670,618			2,060,644		5,511,641		7,572,285		2,087,327		2002	May-40
6161 Green Valley Drive	Bloomington, MN		—			740,378			3,311,602		1,680,574			709,961		5,022,593		5,732,554		2,088,791		1992	May-40
6601-6625 W. 78th Street	Bloomington, MN		—			2,263,060			—		41,737,014			2,310,246		41,689,828		44,000,074		16,555,948		1998	May-40
750 Park of Commerce Boulevard	Boca Raton, FL		—			2,430,000			—		22,129,358			2,473,406		22,085,952		24,559,358		3,353,261		2007	May-40
777 Yamato Road	Boca Raton, FL		—			4,101,247			16,077,347		6,792,033			4,501,247		22,469,380		26,970,627		9,450,754		1987	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
951 Broken Sound Parkway	Boca Raton, FL		—			1,426,251			6,098,952		1,990,222			1,426,251		8,089,174		9,515,425		3,683,396		1986	May-40
1455 Remington Boulevard	Bolingbrook, IL		—			2,501,294			10,704,719		—			2,501,294		10,704,719		13,206,013		589,578		2012	May-40
150 E Crossroads Parkway	Bolingbrook, IL		—		*	3,078,949			14,143,377		845,243			3,078,949		14,988,620		18,067,569		681,812		2013	May-40
553 S Joliet Avenue	Bolingbrook, IL		—		*	3,764,831			15,109,947		1,016,526			3,764,831		16,126,473		19,891,304		830,092		2013	May-40
400 Boulder Drive	Breinigsville, PA		—			2,859,106			—		10,599,615			2,865,575		10,593,146		13,458,721		2,810,834		2003	May-40
8201 Industrial Boulevard	Breinigsville, PA		—		*	2,089,719			—		8,353,910			2,222,168		8,221,461		10,443,629		1,836,038		2006	May-40
8500 Industrial Bouldvard	Breinigsville, PA		—			8,752,708			—		39,845,367			11,511,499		37,086,576		48,598,075		7,869,714		2007	May-40
860 Nestle Way	Breinigsville, PA		—			8,118,881			18,885,486		7,400,855			8,118,881		26,286,341		34,405,222		7,806,275		2004	May-40
1485 W. Commerce Avenue	Carlisle, PA		—			4,249,868			13,886,039		2,314,063			4,095,262		16,354,708		20,449,970		5,401,702		2004	May-40
40 Logistics Drive	Carlisle, PA		—			7,981,850			—		32,774,046			8,081,272		32,674,624		40,755,896		1,837,960		2011	May-40
135-195 East Elk Trail	Carol Stream, IL		—			4,873,094			12,430,320		661,228			4,873,094		13,091,548		17,964,642		418,477		2013	May-40
515 Kehoe Boulevard	Carol Stream, IL		—			5,523,427			14,581,705		202,677			5,523,427		14,784,382		20,307,809		495,025		2013	May-40
1413 Bradley Lane	Carrollton, TX		—		*	247,477			2,028,322		83,523			247,477		2,111,845		2,359,322		97,622		2013	May-40
3200 Belmeade Drive	Carrollton, TX		—			1,042,453			8,027,974		401,254			1,042,453		8,429,228		9,471,681		360,866		2013	May-40
1475 Nitterhouse Drive	Chambersburg, PA		—			7,081,007			39,002,011		2,091,556			7,081,007		41,093,567		48,174,574		1,805,946		2013	May-40
95 Kriner Road	Chambersburg, PA		—			8,695,501			—		34,926,589			9,407,871		34,214,219		43,622,090		5,767,870		2006	May-40
9000 109th Street	Champlain, MN		—		*	1,251,043			11,662,995		119,919			1,251,043		11,782,914		13,033,957		1,144,351		2011	May-40
11701 Goodrich Drive	Charlotte, NC		—			2,054,621			6,356,151		631,251			2,054,621		6,987,401		9,042,022		580,952		2013	May-40
12810 Virkler Drive	Charlotte, NC		—			475,368			2,367,586		706,208			476,262		3,072,899		3,549,161		294,635		2010	May-40
2700 Hutchinson McDonald Road	Charlotte, NC		—			912,500			4,721,259		293,785			912,500		5,015,044		5,927,544		460,922		2011	May-40
2701 Hutchinson McDonald Road	Charlotte, NC		—			1,275,000			4,649,750		651,875			1,275,000		5,301,625		6,576,625		495,724		2011	May-40
2730 Hutchinson McDonald Road	Charlotte, NC		—			1,878,750			10,129,499		30,657			1,878,750		10,160,156		12,038,906		885,076		2011	May-40
2801 Hutchinson McDonald Road	Charlotte, NC		—			1,065,000			6,975,250		211,801			1,065,000		7,187,051		8,252,051		656,037		2011	May-40
3000 Crosspoint Center Lane	Charlotte, NC		—			1,831,250			10,779,412		179,996			1,831,250		10,959,408		12,790,658		1,026,986		2011	May-40
3005 Crosspoint Center Lane	Charlotte, NC		—			1,990,000			6,561,540		442,677			1,990,000		7,004,217		8,994,217		648,233		2011	May-40
4045 Perimeter West Drive	Charlotte, NC		—			1,418,928			7,511,050		8,510			1,418,928		7,519,560		8,938,488		790,434		2011	May-40
4047 Perimeter West Drive	Charlotte, NC		—			1,279,004			—		6,396,981			1,279,004		6,396,981		7,675,985		490,797		2011	May-40
4525 Statesville Road	Charlotte, NC		—			841,250			5,279,315		313,661			837,144		5,597,082		6,434,226		492,662		2011	May-40
4835 Sirona Drive	Charlotte, NC		4,055,621			690,750			5,086,388		182,041			690,750		5,268,429		5,959,179		465,537		2012	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
4925 Sirona Drive	Charlotte, NC		4,011,687			603,003			4,969,011		31,500			603,003		5,000,511		5,603,514		392,055		2012	May-40
5033 Sirona Drive	Charlotte, NC		3,521,593			509,247			4,710,218		193,375			613,962		4,798,878		5,412,840		306,891		2012	May-40
5039 Sirona Drive	Charlotte, NC		—			1,027,500			6,172,807		20,992			1,027,500		6,193,799		7,221,299		41,665		2014	May-40
8910 Pioneer Avenue	Charlotte, NC		—			527,873			4,959,206		51,226			527,873		5,010,432		5,538,305		440,808		2011	May-40
8916 Pioneer Avenue	Charlotte, NC		—			557,730			5,785,333		345,123			557,730		6,130,456		6,688,186		537,610		2011	May-40
1301 Executive Boulevard	Chesapeake, VA		—			997,570			—		5,090,852			970,151		5,118,271		6,088,422		1,070,574		2005	May-40
1305 Executive Boulevard	Chesapeake, VA		—			861,020			—		5,317,649			1,129,850		5,048,819		6,178,669		1,470,458		2002	May-40
1309 Executive Boulevard	Chesapeake, VA		—			926,125			—		5,098,066			955,374		5,068,817		6,024,191		1,755,796		2001	May-40
1313 Executive Boulevard	Chesapeake, VA		—			1,180,036			—		5,146,319			1,708,050		4,618,305		6,326,355		1,661,772		2002	May-40
2601 Indian River Road	Chesapeake, VA		—		*	1,711,746			10,418,032		433,142			1,711,746		10,851,174		12,562,920		488,122		2013	May-40
500 Independence Parkway	Chesapeake, VA		—			864,150			4,427,285		660,242			866,609		5,085,068		5,951,677		1,647,398		2004	May-40
501 Independence Parkway	Chesapeake, VA		—			1,202,556			5,975,538		1,588,745			1,292,273		7,474,566		8,766,839		2,047,049		2005	May-40
505 Independence Parkway	Chesapeake, VA		—			1,292,062			6,456,515		1,413,739			1,292,254		7,870,061		9,162,315		2,014,499		2005	May-40
510 Independence Parkway	Chesapeake, VA		—			2,012,149			7,546,882		1,015,278			2,014,689		8,559,621		10,574,310		2,462,068		2005	May-40
676 Independence Parkway	Chesapeake, VA		—			1,527,303			—		11,380,921			1,562,903		11,345,321		12,908,224		1,668,090		2006	May-40
700 Independence Parkway	Chesapeake, VA		—			1,950,375			7,236,994		663,174			1,951,135		7,899,408		9,850,543		2,560,770		2004	May-40
1540 S 54th Avenue	Cicero, IL		—			3,540,236			20,130,552		927,655			3,540,236		21,058,207		24,598,443		872,113		2013	May-40
4650 Lake Forest Drive	Cinncinnati, OH		—			1,030,242			4,003,024		150,831			1,030,242		4,153,854		5,184,096		191,841		2013	May-40
4750 Lake Forest Drive	Cinncinnati, OH		—			1,138,166			5,914,789		197,670			1,138,166		6,112,459		7,250,625		305,507		2013	May-40
9645 Gerwig Lane	Columbia, MD		—			1,915,960			6,461,228		320,391			1,915,960		6,781,619		8,697,579		318,937		2013	May-40
2550 John Glenn Avenue	Columbus, OH		—			540,601			5,129,342		169,332			540,601		5,298,674		5,839,275		220,056		2013	May-40
3800 Twin Creeks Drive	Columbus, OH		—			549,393			4,643,302		181,695			549,393		4,824,997		5,374,390		223,841		2013	May-40
455 Airline Drive	Coppell, TX		—		*	312,701			2,311,531		742,190			312,701		3,053,721		3,366,422		202,145		2013	May-40
2130 Baldwin Avenue	Crofton, MD		—			3,172,032			7,350,782		418,907			3,172,032		7,769,689		10,941,721		345,403		2013	May-40
329-333 Herrod Boulevard	Dayton, NJ		—		*	4,039,559			20,863,051		2,217,455			4,039,559		23,080,506		27,120,065		895,237		2013	May-40
1250 Hall Court	Deer Park, TX		—			829,570			4,778,327		47,399			831,611		4,823,685		5,655,296		1,053,460		2006	May-40
301-321 S Goolsby Boulevard	Deerfield Beach, FL		—			498,136			2,781,180		162,422			498,136		2,943,602		3,441,738		105,281		2013	May-40
1680 Executive Drive	Duluth, GA		—			1,928,412			4,651,819		569,167			1,928,412		5,220,986		7,149,398		331,184		2013	May-40
1700 Executive Drive	Duluth, GA		—			1,082,072			2,496,599		444,944			1,082,072		2,941,543		4,023,615		166,657		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
2670 Breckinridge Boulevard	Duluth, GA		—			1,676,415			4,567,592		637,896			1,676,415		5,205,489		6,881,904		301,450		2013	May-40
170 Parkway West	Duncan, SC		—			598,348			3,643,756		205,725			598,918		3,848,911		4,447,829		971,351		2006	May-40
190 Parkway West	Duncan, SC		—			551,663			3,310,993		249,227			552,211		3,559,671		4,111,882		773,710		2006	May-40
265 Parkway East	Duncan, SC		—			901,444			5,751,389		190,639			902,374		5,941,098		6,843,472		1,591,923		2006	May-40
285 Parkway East	Duncan, SC		—			975,433			5,851,990		358,457			976,393		6,209,487		7,185,880		1,389,150		2006	May-40
1000 Parliament Court	Durham, NC		—			2,229,000			7,064,506		(6,132		)	2,229,000		7,058,374		9,287,374		141,180		2014	May-40
4226 Surles Court	Durham, NC		—			1,440,000			7,932,265		119,316			1,440,000		8,051,581		9,491,581		147,601		2014	May-40
4227 Surles Court	Durham, NC		—			1,500,000			5,624,030		20,889			1,500,000		5,644,918		7,144,918		94,358		2014	May-40
4234 Surles Court	Durham, NC		—			1,440,000			7,356,161		(5,933		)	1,440,000		7,350,228		8,790,228		141,372		2014	May-40
4300 Emperor Center	Durham, NC		—			1,576,500			4,240,961		—			1,576,500		4,240,961		5,817,461		75,792		2014	May-40
3169 Dodd Road	Eagan, MN		—			988,594			6,586,907		—			988,594		6,586,907		7,575,501		538,170		2012	May-40
3255 Neil Armstrong Boulevard	Eagan, MN		—			1,131,017			—		3,366,267			1,103,860		3,393,424		4,497,284		1,361,295		1998	May-40
3711 Kennebec Drive	Eagan, MN		—			999,702			4,042,589		312,232			999,702		4,354,821		5,354,523		567,528		2011	May-40
917 Lone Oak Road	Eagan, MN		—		*	1,493,115			6,120,455		711,446			1,493,115		6,831,901		8,325,016		387,420		2013	May-40
10301-10305 West 70th Street	Eden Prairie, MN		—			120,622			1,085,226		209,456			118,300		1,297,004		1,415,304		540,055		1984	May-40
10321 West 70th Street	Eden Prairie, MN		—			145,198			1,305,700		571,300			142,399		1,879,799		2,022,198		741,150		1984	May-40
10333 West 70th Street	Eden Prairie, MN		—			110,746			995,868		395,071			108,610		1,393,075		1,501,685		686,758		1984	May-40
10349-10357 West 70th Street	Eden Prairie, MN		—			275,903			2,481,666		790,745			270,584		3,277,730		3,548,314		1,473,755		1985	May-40
10365-10375 West 70th Street	Eden Prairie, MN		—			291,077			2,618,194		905,655			285,464		3,529,462		3,814,926		1,470,536		1985	May-40
10393-10394 West 70th Street	Eden Prairie, MN		—			269,618			2,423,318		1,397,727			264,419		3,826,244		4,090,663		1,356,626		1985	May-40
10400 Viking Drive	Eden Prairie, MN		—			2,912,391			—		23,631,155			2,938,372		23,605,174		26,543,546		10,312,893		1999	May-40
7075 Flying Cloud Drive	Eden Prairie, MN		—			10,232,831			10,855,851		53,338			10,243,977		10,898,042		21,142,019		2,135,275		2007	May-40
7078 Shady Oak Road	Eden Prairie, MN		—			343,093			3,085,795		1,528,369			336,481		4,620,776		4,957,257		2,037,707		1985	May-40
7615 Smetana Lane	Eden Prairie, MN		—			1,011,517			—		9,042,963			3,000,555		7,053,925		10,054,480		2,509,222		2001	May-40
7625 Smetana Lane	Eden Prairie, MN		—			4,500,641			—		3,282,060			1,916,609		5,866,092		7,782,701		1,366,800		2006	May-40
7695-7699 Anagram Drive	Eden Prairie, MN		—			760,525			3,254,758		1,171,692			760,525		4,426,450		5,186,975		2,103,041		1997	May-40
7777 Golden Triangle Drive	Eden Prairie, MN		—			993,101			2,136,862		1,299,413			993,101		3,436,274		4,429,375		1,399,635		2000	May-40
7800 Equitable Drive	Eden Prairie, MN		—			2,188,525			3,788,762		573,212			2,188,525		4,361,973		6,550,498		1,608,943		1993	May-40
7905 Fuller Road	Eden Prairie, MN		—			1,229,862			4,075,167		1,980,136			1,230,965		6,054,200		7,285,165		3,258,697		1994	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
8855 Columbine Road	Eden Prairie, MN		—			1,400,925			—		5,199,574			1,599,757		5,000,742		6,600,499		1,322,395		2000	May-40
8911 Columbine Road	Eden Prairie, MN		—			916,687			—		4,444,635			1,718,407		3,642,915		5,361,322		913,476		2000	May-40
8937 Columbine Road	Eden Prairie, MN		—			1,325,829			—		5,872,477			1,739,966		5,458,340		7,198,306		1,468,530		2001	May-40
8967 Columbine Road	Eden Prairie, MN		—			1,450,000			—		4,536,312			1,450,000		4,536,312		5,986,312		1,565,519		2000	May-40
8995 Columbine Road	Eden Prairie, MN		—			1,087,594			—		4,610,464			2,055,296		3,642,762		5,698,058		1,122,150		2001	May-40
9023 Columbine Road	Eden Prairie, MN		—			1,956,273			—		6,223,935			1,956,273		6,223,935		8,180,208		2,262,205		1999	May-40
2250 Arthur Avenue	Elk Grove, IL		—			1,403,196			2,386,396		51,263			1,403,196		2,437,659		3,840,855		110,507		2013	May-40
6600 Business Parkway	Elkridge, MD		—			3,680,220			14,671,910		395,304			3,680,220		15,067,214		18,747,434		564,896		2013	May-40
6675 Business Parkway	Elkridge, MD		—		*	2,421,854			9,730,192		271,090			2,421,854		10,001,282		12,423,136		383,902		2013	May-40
7351 Coca Cola Drive	Elkridge, MD		—			1,897,044			—		7,287,620			3,023,417		6,161,247		9,184,664		1,466,278		2006	May-40
21705-21707 Mississippi Street	Elwood, IL		—			10,594,259			30,329,802		892,439			10,594,259		31,222,242		41,816,501		2,850,990		2011	May-40
27143 S. Baseline Road	Elwood, IL		—			6,022,000			5,612,934		316,780			6,022,000		5,929,714		11,951,714		585,497		2011	May-40
1800 Donaldson Road	Erlanger, KY		—			—			13,211,604		616,661			—		13,828,265		13,828,265		1,076,746		2013	May-40
180 Sheree Boulevard	Exton, PA		—			2,647,861			11,334,403		2,771,018			2,649,426		14,103,856		16,753,282		3,581,319		2007	May-40
6880 Fairfield Drive	Fairfield, OH		—			412,136			3,029,177		74,745			412,136		3,103,922		3,516,058		129,645		2013	May-40
7000-7018 Fairfield Business	Fairfield, OH		—			367,925			2,205,817		79,892			367,925		2,285,709		2,653,634		105,435		2013	May-40
2000 Southpointe Drive	Forest Park, GA		—			756,221			9,115,626		499,723			756,221		9,615,349		10,371,570		426,230		2013	May-40
1400 NW 65th Place	Fort Lauderdale, FL		—		*	545,480			2,540,210		66,119			545,480		2,606,329		3,151,809		98,750		2013	May-40
6500 NW 12th Avenue	Fort Lauderdale, FL		—		*	—			3,064,734		275,929			—		3,340,663		3,340,663		149,571		2013	May-40
6501 NW 12th Avenue	Fort Lauderdale, FL		—			519,984			2,677,465		51,998			519,984		2,729,463		3,249,447		109,792		2013	May-40
6600 NW 12th Avenue	Fort Lauderdale, FL		—		*	—			2,988,181		184,139			—		3,172,320		3,172,320		144,246		2013	May-40
5400 Alliance Gateway Freeway	Fort Worth, TX		—			1,515,860			6,710,118		403,669			1,515,860		7,113,787		8,629,647		385,887		2013	May-40
101 Constitution Boulevard	Franklin, MA		—			532,339			4,206,412		362,342			532,339		4,568,754		5,101,093		289,771		2013	May-40
20 Liberty Way	Franklin, MA		—			618,521			4,570,341		366,408			618,521		4,936,749		5,555,270		257,465		2013	May-40
9601 Cosner Drive	Fredericksburg, VA		—			475,262			3,917,234		242,595			475,262		4,159,829		4,635,091		2,034,337		1995	May-40
200 W Cypress Creek Road	Ft. Lauderdale, FL		—			3,414,989			2,399,738		9,526,679			3,414,989		11,926,417		15,341,406		2,514,829		2003	May-40
5410 - 5430 Northwest 33rd Avenue	Ft. Lauderdale, FL		—			603,776			4,176,238		1,476,816			625,111		5,631,719		6,256,830		2,437,758		1985	May-40
12601 Industry Street	Garden Grove, CA		—			2,048,143			1,088,697		70,518			2,048,143		1,159,215		3,207,358		91,839		2013	May-40
12641 Industry Street	Garden Grove, CA		—			3,766,822			2,539,214		132,812			3,766,822		2,672,026		6,438,848		121,987		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
12681-12691 Pala Drive	Garden Grove, CA		—			5,221,102			3,225,596		(1,521		)	5,220,148		3,225,029		8,445,177		56,969		2014	May-40
850 S Jupiter Road	Garland, TX		—			799,707			6,122,065		402,188			799,707		6,524,253		7,323,960		263,880		2013	May-40
2510 W Main Street	Grand Prairie, TX		—		*	1,785,741			11,158,818		988,249			1,785,741		12,147,067		13,932,808		668,776		2013	May-40
4251 North Highway 121	Grapevine, TX		—		*	1,165,780			7,799,270		420,260			1,165,780		8,219,529		9,385,309		384,152		2013	May-40
116 Pleasant Ridge Road	Greenville, SC		—			1,547,811			—		14,181,664			3,712,683		12,016,792		15,729,475		1,982,229		2006	May-40
25 Brookfield Oaks Drive	Greenville, SC		—			288,823			3,441,512		28,405			288,823		3,469,917		3,758,740		126,648		2014	May-40
45 Brookfield Oaks Drive	Greenville, SC		—			818,114			—		4,468,582			825,529		4,461,167		5,286,696		847,825		2006	May-40
2011 Southtech Drive	Greenwood, IN		—			223,702			3,574,142		310,465			223,702		3,884,607		4,108,309		215,974		2013	May-40
2121 Southtech Drive	Greenwood, IN		—			272,823			3,606,920		411,808			272,823		4,018,729		4,291,552		269,601		2013	May-40
800 Commerce Parkway West Drive	Greenwood, IN		—			1,374,664			29,963,830		1,540,221			1,374,664		31,504,051		32,878,715		1,328,513		2013	May-40
110 Caliber Ridge Drive	Greer, SC		—			555,549			—		6,305,563			1,228,880		5,632,232		6,861,112		30,651			May-40
1487 South Highway 101	Greer, SC		—			464,237			—		5,829,595			1,301,738		4,992,094		6,293,832		745,613		2007	May-40
2727 London Grove Road	Groveport, OH		—			1,875,607			11,937,935		334,714			1,875,607		12,272,649		14,148,256		598,991		2013	May-40
11841 Newgate Boulevard	Hagerstown, MD		—			3,356,207			—		30,555,105			9,741,685		24,169,627		33,911,312		4,362,445		2008	May-40
1 Enterprise Parkway	Hampton, VA		—			974,675			5,579,869		1,727,218			974,675		7,307,087		8,281,762		3,390,357		1987	May-40
1317 Executive Boulevard	Hampton, VA		—			1,650,423			—		7,950,516			1,128,829		8,472,110		9,600,939		1,755,394		2006	May-40
21 Enterprise Parkway	Hampton, VA		—			263,668			8,167,118		1,128,297			265,719		9,293,364		9,559,083		3,548,369		1999	May-40
22 Enterprise Parkway	Hampton, VA		—			1,097,368			6,760,778		1,519,852			1,097,368		8,280,630		9,377,998		3,629,037		1990	May-40
5 Manhattan Square	Hampton, VA		—			207,368			—		1,540,748			212,694		1,535,422		1,748,116		543,511		1999	May-40
521 Butler Farm Road	Hampton, VA		—			750,769			2,911,149		266,469			710,486		3,217,901		3,928,387		957,344		2003	May-40
1560 Hunter Road	Hanover Park, IL		—		*	2,639,734			12,310,741		578,659			2,639,734		12,889,400		15,529,134		543,284		2013	May-40
1575 Hunter Road	Hanover Park, IL		—		*	3,293,284			17,235,926		836,967			3,293,284		18,072,893		21,366,177		767,470		2013	May-40
7361 Coca Cola Drive	Hanover, MD		—			2,245,187			—		9,391,010			3,822,710		7,813,487		11,636,197		1,201,335		2004	May-40
500 McCarthy Drive	Harrisburg, PA		—		*	5,194,872			19,991,436		4,541,093			5,687,013		24,040,388		29,727,401		7,143,282		2005	May-40
600 Industrial Drive	Harrisburg, PA		—			7,743,800			—		29,161,032			9,368,557		27,536,275		36,904,832		7,033,344		2005	May-40
7195 Grayson Road	Harrisburg, PA		—			464,534			6,066,272		189,405			464,534		6,255,677		6,720,211		246,920		2013	May-40
7253 Grayson Road	Harrisburg, PA		—			954,130			10,585,367		339,743			954,130		10,925,110		11,879,240		407,825		2013	May-40
12537 Cerise Avenue	Hawthorne, CA		—			2,203,194			5,758,809		94,181			2,203,194		5,852,990		8,056,184		214,142		2013	May-40
1010 Petersburg Road	Hebron, KY		—			305,471			5,434,505		306,564			305,471		5,741,069		6,046,540		248,502		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
785 Lindbergh Court	Hebron, KY		—			401,410			3,087,899		466,391			401,410		3,554,290		3,955,700		198,999		2013	May-40
805 Lindbergh Court	Hebron, KY		—			292,096			2,502,486		156,556			292,096		2,659,041		2,951,137		134,921		2013	May-40
825 Lindbergh Court	Hebron, KY		—			370,149			3,095,116		223,435			370,149		3,318,552		3,688,701		195,790		2013	May-40
845 Lindbergh Court	Hebron, KY		—			444,318			3,811,889		257,404			444,318		4,069,293		4,513,611		202,478		2013	May-40
1498 Eagle Hill Drive	High Point, NC		—			94,274			—		6,219,495			791,880		5,521,889		6,313,769		1,175,122		2005	May-40
4183 Eagle Hill Drive	High Point, NC		—			122,203			—		3,309,887			526,266		2,905,824		3,432,090		1,093,077		2001	May-40
4189 Eagle Hill Drive	High Point, NC		—			100,106			—		3,608,848			431,106		3,277,848		3,708,954		1,355,746		2001	May-40
4195 Eagle Hill Drive	High Point, NC		—			107,586			—		3,582,764			505,700		3,184,650		3,690,350		912,889		2004	May-40
4328, 4336 Federal Drive	High Point, NC		1,548,668			521,122			—		7,525,947			825,092		7,221,977		8,047,069		4,564,462		1995	May-40
4344 Federal Drive	High Point, NC		—			484,001			—		3,071,417			173,623		3,381,795		3,555,418		1,577,538		1996	May-40
4380 Federal Drive	High Point, NC		—			282,996			—		2,160,892			283,368		2,160,520		2,443,888		984,864		1997	May-40
4388 Federal Drive	High Point, NC		—			143,661			—		1,213,832			132,655		1,224,838		1,357,493		533,759		1997	May-40
4475 Premier Drive	High Point, NC		—			748,693			—		6,805,541			1,525,421		6,028,813		7,554,234		977,259		2006	May-40
4500 Green Point Drive	High Point, NC		—			230,622			—		2,758,237			231,692		2,757,167		2,988,859		1,300,726		1989	May-40
4501 Green Point Drive	High Point, NC		—			319,289			—		3,156,348			320,450		3,155,187		3,475,637		1,618,112		1989	May-40
4523 Green Point Drive	High Point, NC		—			234,564			—		3,338,836			235,698		3,337,702		3,573,400		1,964,835		1988	May-40
4524 Green Point Drive	High Point, NC		—			182,810			—		2,700,754			183,888		2,699,676		2,883,564		1,547,668		1989	May-40
Unit 5 Logix Road	Hinckley, UK		—			10,547,677			29,691,911		(2,376,899		)	9,924,640		27,938,049		37,862,689		1,028,220		2013	May-40
1515 6th Street South	Hopkins,MN		—			813,036			1,503,075		364,382			813,036		1,867,457		2,680,493		148,094		2013	May-40
1600 5th Street South	Hopkins,MN		—			339,336			2,106,454		80,794			339,336		2,187,249		2,526,585		89,465		2013	May-40
100 Gibraltar Road	Horsham, PA		—			38,729			349,811		59,073			38,729		408,884		447,613		170,127		1975	May-40
100 Witmer Road	Horsham, PA		—			3,102,784			—		20,391,485			3,764,784		19,729,485		23,494,269		7,044,882		1996	May-40
100-107 Lakeside Drive	Horsham, PA		—			239,528			2,163,498		617,512			255,528		2,765,010		3,020,538		1,164,464		1982	May-40
101 Gibraltar Road	Horsham, PA		—			651,990			5,888,989		2,076,842			732,552		7,885,269		8,617,821		3,577,353		1977	May-40
101-111 Rock Road	Horsham, PA		—			350,561			3,166,389		1,200,013			452,251		4,264,712		4,716,963		2,015,331		1975	May-40
102 Rock Road	Horsham, PA		—			1,110,209			2,301,302		1,203,842			1,185,635		3,429,717		4,615,352		1,226,377		1985	May-40
103-109 Gibraltar Road	Horsham, PA		—			270,906			2,448,500		459,093			270,906		2,907,592		3,178,498		1,259,056		1978	May-40
104 Witmer Road	Horsham, PA		—			1,248,148			—		593,447			189,793		1,651,802		1,841,595		686,901		1975	May-40
110 Gibraltar Road	Horsham, PA		—			673,041			5,776,369		1,953,408			673,041		7,729,777		8,402,818		3,295,384		1979	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
111-159 Gibraltar Road	Horsham, PA		—			489,032			4,126,151		1,275,890			489,032		5,402,041		5,891,073		2,540,177		1981	May-40
113-123 Rock Road	Horsham, PA		—			351,072			3,171,001		471,717			451,731		3,542,059		3,993,790		1,488,391		1975	May-40
120 Gibraltar Road	Horsham, PA		—			533,142			4,830,515		1,896,617			558,142		6,702,132		7,260,274		2,840,804		1980	May-40
123-135 Rock Road	Horsham, PA		—			292,360			2,411,677		2,125,649			393,019		4,436,667		4,829,686		1,971,553		1975	May-40
132 Welsh Road	Horsham, PA		—			1,333,642			—		3,856,072			1,408,041		3,781,673		5,189,714		1,658,898		1998	May-40
161-175 Gibraltar Road	Horsham, PA		—			294,673			2,663,722		957,148			294,673		3,620,870		3,915,543		1,661,733		1976	May-40
181-187 Gibraltar Road	Horsham, PA		—			360,549			3,259,984		787,154			360,549		4,047,138		4,407,687		1,951,593		1982	May-40
2 Walnut Grove Drive	Horsham, PA		—			1,281,870			7,767,374		1,630,465			1,265,363		9,414,346		10,679,709		4,306,233		1989	May-40
200 Gibraltar Road	Horsham, PA		—			638,513			5,811,323		2,190,173			638,513		8,001,496		8,640,009		3,588,279		1990	May-40
200-264 Lakeside Drive	Horsham, PA		—			502,705			4,540,597		2,297,906			502,705		6,838,503		7,341,208		2,983,479		1982	May-40
201 Gibraltar Road	Horsham, PA		—			380,127			3,433,433		2,324,673			380,802		5,757,431		6,138,233		2,469,255		1983	May-40
210-223 Witmer Road	Horsham, PA		—			270,282			2,441,276		2,098,514			270,282		4,539,790		4,810,072		1,888,542		1972	May-40
220 Gibraltar Road	Horsham, PA		—			629,944			5,733,228		2,917,249			629,944		8,650,477		9,280,421		3,058,488		1990	May-40
231-237 Gibraltar Road	Horsham, PA		—			436,952			3,948,963		1,323,981			436,952		5,272,944		5,709,896		2,317,867		1981	May-40
240 Gibraltar Road	Horsham, PA		—			629,944			5,733,234		1,999,990			629,944		7,733,224		8,363,168		3,841,222		1990	May-40
261-283 Gibraltar Road	Horsham, PA		—			464,871			3,951,972		1,830,425			464,871		5,782,397		6,247,268		2,644,978		1978	May-40
300 Welsh Road	Horsham, PA		—			696,061			3,339,991		640,370			696,061		3,980,360		4,676,421		1,823,181		1985	May-40
300 Welsh Road - Building 3	Horsham, PA		—			180,459			1,441,473		633,163			180,459		2,074,635		2,255,094		920,446		1983	May-40
300 Welsh Road - Building 4	Horsham, PA		—			282,493			2,256,508		1,769,703			282,493		4,026,211		4,308,704		1,907,245		1983	May-40
300-309 Lakeside Drive	Horsham, PA		—			369,475			3,338,761		1,834,004			376,475		5,165,765		5,542,240		2,736,644		1982	May-40
4 Walnut Grove	Horsham, PA		—			2,515,115			—		10,809,109			2,515,115		10,809,109		13,324,224		5,046,256		1999	May-40
400-445 Lakeside Drive	Horsham, PA		—			543,628			4,910,226		1,849,211			583,628		6,719,437		7,303,065		2,791,088		1981	May-40
455 Business Center Drive	Horsham, PA		—			1,351,011			2,503,449		1,982,282			1,322,317		4,514,425		5,836,742		1,405,567		2003	May-40
5 Walnut Grove Drive	Horsham, PA		—			1,065,951			—		10,357,952			1,939,712		9,484,191		11,423,903		3,689,060		2000	May-40
506 Prudential Road	Horsham, PA		—			208,140			895,470		894,621			208,140		1,790,091		1,998,231		878,782		1973	May-40
507 Prudential Road	Horsham, PA		—			644,900			5,804,100		8,408,030			1,131,380		13,725,650		14,857,030		6,683,111		1988	May-40
555 Business Center Drive	Horsham, PA		—			727,420			1,353,650		1,483,904			709,967		2,855,008		3,564,975		562,069		2003	May-40
680 Blair Mill Road	Horsham, PA		—			3,527,151			—		17,513,692			4,138,577		16,902,266		21,040,843		6,001,289		2001	May-40
7 Walnut Grove Drive	Horsham, PA		—			2,631,696			—		18,432,489			2,631,956		18,432,229		21,064,185		3,441,129		2006	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
700 Dresher Road	Horsham, PA		—			2,551,777			3,020,638		3,596,408			2,565,140		6,603,683		9,168,823		2,485,966		1987	May-40
747 Dresher Road	Horsham, PA		—			1,607,238			—		5,032,964			1,607,977		5,032,225		6,640,202		3,120,360		1988	May-40
767 Electronic Drive	Horsham, PA		—			1,229,685			—		2,436,397			1,241,970		2,424,112		3,666,082		1,433,977		1996	May-40
1000 South Loop West	Houston, TX		—		*	509,351			3,549,504		395,718			509,351		3,945,222		4,454,573		203,455		2013	May-40
10241 W Little York Road	Houston, TX		—			558,491			5,740,552		129,761			558,491		5,870,313		6,428,804		218,761		2013	May-40
10245 W Little York Road	Houston, TX		—			426,927			3,460,513		234,333			426,927		3,694,846		4,121,773		174,611		2013	May-40
10301 Round Up Lane	Houston, TX		—			545,501			2,927,700		1,014,387			545,501		3,942,086		4,487,587		306,335		2010	May-40
10305 Round Up Lane	Houston, TX		—			1,340,609			7,489,720		3,358,808			1,340,609		10,848,527		12,189,136		1,387,761		2010	May-40
10607 Haddington Drive	Houston, TX		—		*	201,469			1,631,561		175,697			201,469		1,807,259		2,008,728		78,814		2013	May-40
10735 West Little York Road	Houston, TX		—		*	1,110,988			6,351,946		3,271,063			1,135,483		9,598,514		10,733,997		2,691,079		2000	May-40
10739 West Little York Road	Houston, TX		—		*	797,931			5,950,894		401,107			799,560		6,350,372		7,149,932		2,003,943		1999	May-40
11201 Greens Crossing Boulevard	Houston, TX		—		*	1,006,194			5,412,584		2,777,537			1,008,542		8,187,773		9,196,315		2,018,474		2007	May-40
1283 N Post Oak Road	Houston, TX		—		*	80,730			870,656		145,476			80,730		1,016,132		1,096,862		48,433		2013	May-40
1287 N Post Oak Road	Houston, TX		—		*	146,654			1,620,780		59,710			146,654		1,680,489		1,827,143		90,144		2013	May-40
1291 N Post Oak Road	Houston, TX		—		*	510,102			4,129,042		441,345			510,102		4,570,387		5,080,489		203,222		2013	May-40
1416 N Sam Houston Parkway East	Houston, TX		—		*	218,850			1,639,902		329,902			218,850		1,969,803		2,188,653		82,673		2013	May-40
1420 N Sam Houston Parkway East	Houston, TX		—		*	211,279			1,554,156		111,783			211,279		1,665,939		1,877,218		78,870		2013	May-40
14200 Hollister Road	Houston, TX		—			1,396,794			—		4,855,857			1,699,632		4,553,019		6,252,651		303,736		2011	May-40
1424 N Sam Houston Parkway East	Houston, TX		—		*	283,107			2,077,323		284,788			283,107		2,362,111		2,645,218		110,954		2013	May-40
1428 N Sam Houston Parkway East	Houston, TX		—		*	367,446			1,952,453		133,350			367,446		2,085,802		2,453,248		101,311		2013	May-40
14300 Hollister Road	Houston, TX		—		*	1,377,193			—		5,497,809			1,405,899		5,469,103		6,875,002		159,872		2014	May-40
14400 Hollister Road	Houston, TX		—		*	1,830,419			—		7,063,858			1,861,540		7,032,737		8,894,277		442,923		2012	May-40
15102 Sommermeyer Street	Houston, TX		—			755,121			3,155,774		247,397			755,121		3,403,171		4,158,292		170,031		2013	May-40
15150 Sommermeyer Street	Houston, TX		—			418,580			1,564,587		295,011			418,580		1,859,598		2,278,178		88,933		2013	May-40
16330 Central Green Boulevard	Houston, TX		—		*	1,540,109			—		8,524,625			1,966,472		8,098,262		10,064,734		204,640		2014	May-40
16405 Air Center Boulevard	Houston, TX		—			438,853			3,030,396		506,207			438,853		3,536,603		3,975,456		1,604,732		1997	May-40
16420 West Hardy Road	Houston, TX		—			529,876			3,267,872		149,476			529,876		3,417,348		3,947,224		133,420		2013	May-40
16445 Air Center Boulevard	Houston, TX		—		*	363,339			2,509,186		266,552			363,339		2,775,738		3,139,077		1,200,463		1997	May-40
1646 Rankin Road	Houston, TX		—		*	329,961			—		4,944,959			592,234		4,682,686		5,274,920		1,002,826		2005	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
1655 Townhurst Drive	Houston, TX		—		*	197,226			935,036		474,198			197,226		1,409,234		1,606,460		57,052		2013	May-40
16580 Air Center Boulevard	Houston, TX		—		*	289,000			3,559,857		1,281,260			289,000		4,841,118		5,130,118		1,631,421		1997	May-40
16602 Central Green Boulevard	Houston, TX		—		*	284,403			—		4,953,014			503,779		4,733,638		5,237,417		1,075,204		2005	May-40
16605 Air Center Boulevard	Houston, TX		—		*	298,999			—		3,417,513			496,186		3,220,326		3,716,512		1,014,594		2002	May-40
1665 Townhurst Drive	Houston, TX		—		*	452,439			2,016,585		57,074			452,439		2,073,658		2,526,097		81,921		2013	May-40
16680 Central Green Boulevard	Houston, TX		—		*	311,952			—		4,165,907			492,869		3,984,990		4,477,859		1,028,469		2001	May-40
16685 Air Center Boulevard	Houston, TX		—		*	414,691			—		2,459,484			414,691		2,459,484		2,874,175		643,446		2004	May-40
1755 Trans Central Drive	Houston, TX		—		*	293,534			3,036,269		724,255			306,147		3,747,911		4,054,058		1,217,765		1999	May-40
4301 S Pinemont Drive	Houston, TX		—		*	226,973			1,174,979		77,965			226,973		1,252,944		1,479,917		64,788		2013	May-40
4401 S Pinemont Drive	Houston, TX		—		*	244,240			1,412,622		75,463			244,240		1,488,085		1,732,325		120,514		2013	May-40
4501 S Pinemont Drive	Houston, TX		—		*	252,907			1,504,053		55,906			252,907		1,559,959		1,812,866		125,078		2013	May-40
5200 N. Sam Houston Parkway	Houston, TX		—		*	1,519,458			7,135,548		3,649,598			1,520,074		10,784,530		12,304,604		2,575,531		2007	May-40
5250 N. Sam Houston Parkway	Houston, TX		—		*	2,173,287			8,868,256		2,740,727			2,173,942		11,608,328		13,782,270		2,362,379		2007	May-40
5500 N. Sam Houston Parkway West	Houston, TX		—			1,243,541			—		6,452,951			1,513,152		6,183,340		7,696,492		570,606		2011	May-40
8017 Pinemont Drive	Houston, TX		—			900,953			5,323,727		91,219			900,953		5,414,946		6,315,899		203,059		2013	May-40
8272 El Rio Street	Houston, TX		—		*	530,494			4,108,626		255,506			530,494		4,364,132		4,894,626		191,504		2013	May-40
8282 El Rio Street	Houston, TX		—		*	450,422			3,304,942		637,280			450,422		3,942,222		4,392,644		162,469		2013	May-40
8301 Fallbrook Drive	Houston, TX		—		*	4,515,862			—		26,894,221			7,083,514		24,326,569		31,410,083		4,209,471		2006	May-40
850 Greens Parkway	Houston, TX		—		*	2,893,405			11,593,197		2,849,036			2,899,861		14,435,776		17,335,637		2,562,574		2007	May-40
860 Greens Parkway	Houston, TX		—		*	1,399,365			6,344,650		1,579,558			1,374,012		7,949,561		9,323,573		1,490,162		2007	May-40
8801-19 & 8821-49 Fallbrook Drive	Houston, TX		—		*	2,290,001			15,297,141		2,023,870			2,290,002		17,321,010		19,611,012		5,164,247		2000	May-40
8802-8824 Fallbrook Drive	Houston, TX		—		*	2,774,995			6,364,767		1,362,915			2,775,021		7,727,655		10,502,676		2,342,008		2004	May-40
8825-8839 N Sam Houston Parkway	Houston, TX		—		*	638,453			3,258,815		694,831			638,477		3,953,621		4,592,098		962,028		2004	May-40
8850-8872 Fallbrook Drive	Houston, TX		—		*	504,317			2,878,351		1,054,230			504,341		3,932,557		4,436,898		1,467,037		2004	May-40
Liberty 11 at Central Green	Houston, TX		—			1,748,348			—		9,388,335			2,120,319		9,016,364		11,136,683		493,289		2012	May-40
Cabot III UK1B01	Isle of Man, UK		—			11,888,058			35,003,668		(2,769,630		)	11,185,846		32,936,250		44,122,096		1,170,109		2013	May-40
1011 N Hilltop Drive	Itasca, IL		—			842,043			984,087		85,979			842,043		1,070,066		1,912,109		41,246		2013	May-40
1035 N Hilltop Drive	Itasca, IL		—			875,172			2,071,051		52,042			875,172		2,123,094		2,998,266		90,707		2013	May-40
1549 W Glenlake Avenue	Itasca, IL		—		*	1,339,627			3,763,288		184,424			1,339,627		3,947,711		5,287,338		157,326		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
901 N Hilltop Drive	Itasca, IL		—			866,378			2,112,616		46,745			866,378		2,159,361		3,025,739		82,105		2013	May-40
925 N Hilltop Drive	Itasca, IL		—			945,251			2,010,181		46,316			945,251		2,056,497		3,001,748		76,319		2013	May-40
8241 Sandy Court	Jessup, MD		—			1,246,618			6,844,393		424,643			1,246,618		7,269,035		8,515,653		283,274		2013	May-40
8242 Sandy Court	Jessup, MD		—			1,488,746			9,072,440		1,118,340			1,488,746		10,190,780		11,679,526		385,761		2013	May-40
8246 Sandy Court	Jessup, MD		—			590,922			3,374,522		93,541			590,922		3,468,063		4,058,985		140,981		2013	May-40
1305 Chastain Road NW	Kennesaw, GA		—		*	808,159			5,712,959		613,490			808,159		6,326,449		7,134,608		319,389		2013	May-40
1325 Chastain Road NW	Kennesaw, GA		—		*	1,612,924			9,771,680		1,387,503			1,612,924		11,159,183		12,772,107		620,142		2013	May-40
3600 Cobb International Boulevard NW	Kennesaw, GA		—			716,860			6,962,212		433,426			716,860		7,395,639		8,112,499		362,293		2013	May-40
Unit 1 Bear Way	Kettering, UK		—			10,849,890			36,219,855		(2,780,348		)	10,209,001		34,080,396		44,289,397		1,221,467		2013	May-40
151 South Warner Road	King of Prussia, PA		—			1,218,086			6,937,866		6,834,149			1,187,900		13,802,201		14,990,101		2,179,231		1980	May-40
170 South Warner Road	King of Prussia, PA		—			547,800			3,137,400		5,612,558			458,232		8,839,526		9,297,758		3,172,026		1980	May-40
180 South Warner Drive	King of Prussia, PA		—			995,393			—		8,781,614			—		9,777,007		9,777,007		1,128,905		2009	May-40
190 South Warner Road	King of Prussia, PA		—			552,200			3,162,600		1,545,816			461,909		4,798,707		5,260,616		2,231,829		1980	May-40
2100 Renaissance Boulevard	King of Prussia, PA		—			1,110,111			—		12,322,939			1,132,519		12,300,531		13,433,050		4,289,689		1999	May-40
2201 Renaissance Boulevard	King of Prussia, PA		—			2,370,895			—		15,284,223			2,413,514		15,241,604		17,655,118		6,061,755		2000	May-40
2300 Renaissance Boulevard	King of Prussia, PA		—			509,580			—		3,057,624			574,152		2,993,052		3,567,204		1,541,908		1999	May-40
2301 Renaissance Boulevard	King of Prussia, PA		—			1,645,246			—		30,080,438			4,581,649		27,144,035		31,725,684		10,753,365		2002	May-40
2500 Renaissance Boulevard	King of Prussia, PA		—			509,580			—		2,663,076			592,886		2,579,770		3,172,656		1,236,260		1999	May-40
2520 Renaissance Boulevard	King of Prussia, PA		—			1,020,000			—		3,649,705			978,402		3,691,303		4,669,705		1,406,070		1999	May-40
2560 Renaissance Boulevard	King of Prussia, PA		—			607,210			—		3,122,044			649,792		3,079,462		3,729,254		1,433,510		2000	May-40
2700 Horizon Drive	King of Prussia, PA		—			764,370			—		3,646,466			867,815		3,543,021		4,410,836		1,670,057		1998	May-40
2900 Horizon Drive	King of Prussia, PA		—			679,440			—		3,503,074			774,096		3,408,418		4,182,514		1,597,991		1998	May-40
3000 Horizon Drive	King of Prussia, PA		—			1,191,449			—		2,476,299			946,703		2,721,045		3,667,748		1,111,514		1997	May-40
3100 Horizon Drive	King of Prussia, PA		—			601,956			—		2,192,852			611,436		2,183,372		2,794,808		1,008,387		1995	May-40
3200 Horizon Drive	King of Prussia, PA		—			928,637			—		6,882,269			1,210,137		6,600,769		7,810,906		2,562,017		1996	May-40
3400 Horizon Drive	King of Prussia, PA		—			776,496			3,139,068		1,537,958			776,496		4,677,025		5,453,521		1,945,285		1995	May-40
3500 Horizon Drive	King of Prussia, PA		—			1,204,839			—		2,830,072			1,223,875		2,811,036		4,034,911		1,276,539		1996	May-40
3600 Horizon Drive	King of Prussia, PA		—			236,432			1,856,252		820,449			236,432		2,676,701		2,913,133		1,127,390		1989	May-40
3602 Horizon Drive	King of Prussia, PA		—			217,734			1,759,489		406,692			217,809		2,166,106		2,383,915		990,639		1989	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
3604 Horizon Drive	King of Prussia, PA		—			397,178			—		1,836,269			350,874		1,882,573		2,233,447		894,044		1998	May-40
440 East Swedesford Road	King of Prussia, PA		—			717,001			4,816,121		2,824,138			717,001		7,640,259		8,357,260		3,859,492		1988	May-40
460 East Swedesford Road	King of Prussia, PA		—			705,317			4,737,487		4,227,341			705,317		8,964,828		9,670,145		3,739,395		1988	May-40
650 Swedesford Road	King of Prussia, PA		—			952,911			6,722,830		8,145,922			952,911		14,868,752		15,821,663		7,073,206		1971	May-40
680 Swedesford Road	King of Prussia, PA		—			952,361			6,722,830		7,217,277			952,361		13,940,107		14,892,468		6,688,897		1971	May-40
1700 Interstate Drive	Lakeland, FL		—			650,000			5,444,220		—			650,000		5,444,220		6,094,220		321,337		2012	May-40
5801 Columbia Park Road	Landover,MD		—			1,187,620			4,598,346		182,789			1,187,620		4,781,135		5,968,755		207,464		2013	May-40
11425 State Highway 225	LaPorte, TX		—		*	975,974			3,409,036		51,385			977,542		3,458,852		4,436,394		799,109		2006	May-40
11503 State Highway 225	LaPorte, TX		—		*	2,561,931			9,695,493		237,274			2,566,047		9,928,651		12,494,698		2,191,065		2006	May-40
640 S State Road 39	Lebanon,IN		—			1,612,787			18,065,552		1,213,251			1,612,787		19,278,803		20,891,590		872,383		2013	May-40
7528 Walker Way	Lehigh, PA		—			893,441			—		5,510,457			779,330		5,624,568		6,403,898		1,808,110		2004	May-40
8301 Industrial Boulevard	Lehigh, PA		—			11,249,550			—		45,456,591			11,254,716		45,451,425		56,706,141		10,329,485		2005	May-40
8500 Willard Drive	Lehigh, PA		2,008,569			6,398,815			—		21,928,341			7,734,826		20,592,330		28,327,156		3,602,697		2004	May-40
875 Maxham Road	Lithia Springs, GA		—			445,493			10,160,616		558,420			445,493		10,719,036		11,164,529		451,773		2013	May-40
7533 Industrial Parkway	Lower Macungie, PA		—			5,603,460			18,807,987		2,434,039			5,603,460		21,242,026		26,845,486		2,675,692		2011	May-40
1 Country View Road	Malvern, PA		—			400,000			3,600,000		8,322,449			406,421		11,916,028		12,322,449		3,920,320		1982	May-40
1 Great Valley Parkway	Malvern, PA		—			419,460			3,792,570		1,457,280			419,460		5,249,850		5,669,310		2,184,617		1982	May-40
10 Great Valley Parkway	Malvern, PA		—			823,540			1,341,376		459,973			832,244		1,792,645		2,624,889		661,691		2003	May-40
10 Valley Stream Parkway	Malvern, PA		—			509,075			—		2,699,241			509,899		2,698,417		3,208,316		1,859,067		1984	May-40
10, 20 Liberty Boulevard	Malvern, PA		—			724,058			—		5,944,127			724,846		5,943,339		6,668,185		3,677,124		1985	May-40
100 Chesterfield Parkway	Malvern, PA		—			1,320,625			—		7,509,345			1,977,935		6,852,035		8,829,970		3,504,664		1998	May-40
1001 Cedar Hollow Road	Malvern, PA		—			1,436,814			—		16,319,176			1,676,470		16,079,520		17,755,990		8,046,092		1998	May-40
11 Great Valley Parkway	Malvern, PA		—			496,297			—		2,962,685			708,331		2,750,651		3,458,982		956,089		2001	May-40
11,15 Great Valley Parkway	Malvern, PA		—			1,837,050			—		14,960,110			1,837,878		14,959,282		16,797,160		11,823,804		1986	May-40
12,14,16 Great Valley Parkway	Malvern, PA		—			130,689			—		1,326,294			128,767		1,328,216		1,456,983		943,797		1982	May-40
14 Lee Boulevard	Malvern, PA		—			664,282			—		5,829,707			643,892		5,850,097		6,493,989		3,799,033		1988	May-40
155 Great Valley Parkway	Malvern, PA		—			625,147			—		2,640,082			626,068		2,639,161		3,265,229		2,021,418		1981	May-40
18 Great Valley Parkway	Malvern, PA		—			394,036			3,976,221		68,969			397,293		4,041,933		4,439,226		1,604,030		1980	May-40
2 West Liberty Boulevard	Malvern, PA		—			5,405,041			—		11,905,100			5,405,042		11,905,099		17,310,141		3,553,154		2003	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
20 Valley Stream Parkway	Malvern, PA		—			465,539			—		6,376,881			466,413		6,376,007		6,842,420		3,639,774		1987	May-40
200 Chesterfield Parkway	Malvern, PA		—			495,893			2,739,093		692,113			812,745		3,114,354		3,927,099		2,480,908		1989	May-40
257-275 Great Valley Parkway	Malvern, PA		—			504,611			—		5,074,448			505,458		5,073,601		5,579,059		3,594,060		1983	May-40
27-43 Great Valley Parkway	Malvern, PA		—			448,775			—		2,409,325			449,447		2,408,653		2,858,100		1,890,813		1977	May-40
277-293 Great Valley Parkway	Malvern, PA		—			530,729			—		2,341,016			531,534		2,340,211		2,871,745		1,602,008		1984	May-40
3 Country View Road	Malvern, PA		—			814,278			—		5,142,433			1,128,881		4,827,830		5,956,711		2,009,687		1998	May-40
30 Great Valley Parkway	Malvern, PA		—			128,126			—		578,846			128,783		578,189		706,972		404,423		1975	May-40
300 Technology Drive	Malvern, PA		—			368,626			—		1,483,233			374,497		1,477,362		1,851,859		919,452		1985	May-40
300-400 Chesterfield Parkway	Malvern, PA		—			937,212			—		6,299,779			1,402,795		5,834,196		7,236,991		2,943,609		1988	May-40
311 Technology Drive	Malvern, PA		—			397,131			—		2,710,506			397,948		2,709,689		3,107,637		1,874,760		1984	May-40
333 Phoenixville Pike	Malvern, PA		—			523,530			—		3,708,843			524,230		3,708,143		4,232,373		2,402,798		1985	May-40
375 Technology Drive	Malvern, PA		—			191,114			—		1,625,516			234,922		1,581,708		1,816,630		682,324		1998	May-40
40 Liberty Boulevard	Malvern, PA		—			4,241,137			17,737,090		2,964,825			4,241,167		20,701,884		24,943,051		8,848,962		1989	May-40
40 Valley Stream Parkway	Malvern, PA		—			322,918			—		3,325,030			325,775		3,322,173		3,647,948		1,596,173		1987	May-40
420 Lapp Road	Malvern, PA		—			1,054,418			—		8,897,631			1,055,243		8,896,806		9,952,049		4,686,877		1989	May-40
425 Old Morehall Road	Malvern, PA		—			3,847,501			—		44,772,891			9,953,208		38,667,184		48,620,392		335,169		2014	May-40
425 Technology Drive	Malvern, PA		—			191,114			—		1,708,623			321,473		1,578,264		1,899,737		716,843		1998	May-40
45 Liberty Boulevard	Malvern, PA		—			4,380,221			—		15,322,821			4,749,748		14,953,294		19,703,042		7,549,963		1999	May-40
45-67 Great Valley Parkway	Malvern, PA		—			795,143			—		4,811,065			795,831		4,810,377		5,606,208		3,085,878		1974	May-40
5 Country View Road	Malvern, PA		—			785,168			4,678,632		220,136			786,235		4,897,701		5,683,936		4,663,371		1985	May-40
5 Great Valley Parkway	Malvern, PA		—			684,200			6,181,661		2,261,679			684,200		8,443,340		9,127,540		3,617,433		1983	May-40
50 Morehall Road	Malvern, PA		—			849,576			—		14,095,935			1,337,076		13,608,435		14,945,511		6,831,325		1997	May-40
50 Valley Stream Parkway	Malvern, PA		—			323,971			—		3,100,515			323,792		3,100,694		3,424,486		1,605,810		1987	May-40
500 Chesterfield Parkway	Malvern, PA		—			472,364			—		3,162,401			762,370		2,872,395		3,634,765		1,748,571		1988	May-40
508 Lapp Road	Malvern, PA		—			331,392			—		1,661,431			332,216		1,660,607		1,992,823		1,174,148		1984	May-40
510 Lapp Road	Malvern, PA		—			356,950			—		926,587			357,751		925,786		1,283,537		745,524		1983	May-40
55 Valley Stream Parkway	Malvern, PA		—			215,005			—		4,674,159			215,818		4,673,346		4,889,164		3,077,100		1983	May-40
60 Morehall Road	Malvern, PA		—			865,424			9,285,000		5,182,805			884,974		14,448,255		15,333,229		9,348,321		1989	May-40
600 Chesterfield Parkway	Malvern, PA		—			2,013,750			—		9,218,329			2,798,565		8,433,514		11,232,079		4,134,849		1999	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
65 Valley Stream Parkway	Malvern, PA		—			381,544			—		7,371,688			382,361		7,370,871		7,753,232		5,287,217		1983	May-40
7 Great Valley Parkway	Malvern, PA		—			176,435			—		6,966,060			177,317		6,965,178		7,142,495		3,382,814		1985	May-40
700 Chesterfield Parkway	Malvern, PA		—			2,013,750			—		8,957,984			2,785,823		8,185,911		10,971,734		4,093,141		1999	May-40
75 Great Valley Parkway	Malvern, PA		—			143,074			—		618,372			143,811		617,635		761,446		517,897		1977	May-40
77-123 Great Valley Parkway	Malvern, PA		—			887,664			—		5,415,601			888,359		5,414,906		6,303,265		3,973,746		1978	May-40
1169 Canton Rd	Marietta, GA		—		*	1,232,219			17,897,326		435,643			1,232,219		18,332,969		19,565,188		698,307		2013	May-40
65 Brookfield Oaks Drive	Mauldin, SC		—			557,174			—		2,854,015			506,318		2,904,871		3,411,189		709,233		2004	May-40
75 Brookfield Oaks Drive	Mauldin, SC		—			419,731			—		2,341,542			430,909		2,330,364		2,761,273		634,095		2003	May-40
126-132 Liberty Industrial Parkway	McDonough, GA		—			600,666			4,184,131		543,200			600,666		4,727,330		5,327,996		319,917		2013	May-40
95-115 Liberty Industrial Parkway	McDonough, GA		—			660,420			4,785,127		547,148			660,420		5,332,275		5,992,695		311,978		2013	May-40
11401 NW 134th Street	Medley, FL		—		*	5,558,619			17,678,237		896,842			5,558,619		18,575,079		24,133,698		797,567		2013	May-40
3824-3960 Crowfarn Drive	Memphis, TN		—			291,223			1,044,953		74,204			291,223		1,119,156		1,410,379		83,033		2013	May-40
12501 & 12701 Whitewater Drive	Minnetonka, MN		—			2,175,209			3,948,085		8,735,905			2,177,953		12,681,246		14,859,199		3,995,333		1986	May-40
12800 Whitewater Drive	Minnetonka, MN		—			1,273,600			3,158,737		2,090,734			1,273,731		5,249,339		6,523,070		408,984		2011	May-40
12900 Whitewater Drive	Minnetonka, MN		—			1,236,560			2,762,325		1,468,108			1,236,687		4,230,306		5,466,993		337,484		2011	May-40
5400-5500 Feltl Road	Minnetonka, MN		—			883,895			7,983,345		3,579,074			883,895		11,562,419		12,446,314		4,883,003		1985	May-40
6000 Clearwater Drive	Minnetonka, MN		—			985,016			2,091,371		2,503,007			985,117		4,594,277		5,579,394		439,175		2011	May-40
456 International Parkway	Minooka, IL		—			3,862,683			14,357,981		4,801,914			3,862,683		19,159,895		23,022,578		792,052		2012	May-40
3100 SW 145th Avenue	Miramar, FL		—			6,204,407			—		16,723,386			6,265,000		16,662,793		22,927,793		2,643,402		2007	May-40
3350 SW 148th Avenue	Miramar, FL		—			2,960,511			—		17,616,594			2,980,689		17,596,416		20,577,105		6,988,133		2000	May-40
3400 Lakeside Drive	Miramar, FL		—			2,022,153			11,345,881		2,116,685			2,022,153		13,462,566		15,484,719		5,734,572		1990	May-40
3450 Lakeside Drive	Miramar, FL		—			2,022,152			11,357,143		3,408,674			2,022,152		14,765,817		16,787,969		6,526,825		1990	May-40
21 S Middlesex Avenue	Monroe Township, NJ		—		*	2,097,170			9,715,401		560,312			2,097,170		10,275,713		12,372,883		495,630		2013	May-40
4 S Middlesex Avenue	Monroe Township, NJ		—		*	2,263,153			10,261,759		599,026			2,263,153		10,860,785		13,123,938		475,968		2013	May-40
22750 Cactus Avenue	Moreno Valley, CA		—			9,404,283			24,380,934		1,851,865			9,408,276		26,228,806		35,637,082		490,170		2014	May-40
323 Park Knoll Drive	Morrisville, NC		2,534,078			1,071,600			4,397,807		1,028,987			1,071,600		5,426,794		6,498,394		902,673		2010	May-40
324 Park Knoll Drive	Morrisville, NC		—		*	1,449,092			4,424,932		321,760			1,449,450		4,746,334		6,195,784		1,005,152		2007	May-40
619 Distribution Drive	Morrisville, NC		—		*	1,031,430			5,655,167		226,631			1,031,685		5,881,543		6,913,228		1,176,421		2007	May-40
627 Distribution Drive	Morrisville, NC		—		*	1,061,370			5,152,110		595,652			1,061,632		5,747,500		6,809,132		1,220,446		2007	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
701 Distribution Drive	Morrisville, NC		—		*	1,300,889			5,313,226		207,184			1,301,211		5,520,088		6,821,299		1,123,136		2007	May-40
220 Lake Drive	Newark, DE		—			566,650			6,099,337		782,233			566,650		6,881,570		7,448,220		287,917		2013	May-40
222 Lake Drive	Newark, DE		—			1,045,238			1,975,553		149,013			1,045,238		2,124,565		3,169,803		122,058		2013	May-40
1879 Lamont Avenue	Odenton, MD		—			1,976,000			8,099,579		2,469,160			2,011,030		10,533,709		12,544,739		3,155,743		2004	May-40
350 Winmeyer Avenue	Odenton, MD		—			1,778,400			7,289,165		2,074,288			1,809,927		9,331,926		11,141,853		2,561,604		2004	May-40
4000 E Airport Drive	Ontario, CA		—			2,686,533			10,125,772		408,877			2,686,533		10,534,649		13,221,182		437,422		2013	May-40
1000 Gills Drive	Orlando, FL		—			415,906			—		2,824,930			435,400		2,805,436		3,240,836		500,344		2006	May-40
10003 Satellite Boulevard	Orlando, FL		—			680,312			2,120,754		1,343,847			680,312		3,464,601		4,144,913		1,132,887		2003	May-40
10511 & 10611 Satellite Boulevard	Orlando, FL		—			517,554			2,568,186		692,668			522,991		3,255,417		3,778,408		1,390,788		1985	May-40
10771 Palm Bay Drive	Orlando, FL		—			664,605			—		2,513,013			685,383		2,492,235		3,177,618		768,667		2001	May-40
1090 Gills Drive	Orlando, FL		—			878,320			2,558,833		1,438,037			878,320		3,996,870		4,875,190		1,142,230		2003	May-40
1400-1440 Central Florida Parkway	Orlando, FL		—			518,043			2,561,938		976,217			518,043		3,538,155		4,056,198		1,542,263		1962	May-40
1902 Cypress Lake Drive	Orlando, FL		—			523,512			3,191,790		1,515,373			538,512		4,692,163		5,230,675		1,952,861		1989	May-40
2000 Park Oaks Avenue	Orlando, FL		—		*	913,201			6,818,610		241,819			913,201		7,060,429		7,973,630		311,083		2013	May-40
2202 Taft-Vineland Road	Orlando, FL		—			1,283,713			—		7,181,368			1,283,713		7,181,368		8,465,081		2,501,397		2004	May-40
2212 Taft Vineland Road	Orlando, FL		—			467,296			—		2,855,024			825,673		2,496,647		3,322,320		656,682		2005	May-40
2256 Taft-Vineland Road	Orlando, FL		—			2,261,924			7,496,249		2,545,018			2,271,785		10,031,406		12,303,191		2,860,842		2004	May-40
2351 Investors Row	Orlando, FL		—			385,964			—		3,215,820			642,427		2,959,357		3,601,784		1,053,814		2001	May-40
2400 South Lake Orange Drive	Orlando, FL		—			1,236,819			3,243,314		708,578			1,244,667		3,944,044		5,188,711		268,566		2012	May-40
2412 Sand Lake Road	Orlando, FL		—			535,964			—		3,830,135			704,800		3,661,299		4,366,099		1,020,666		2002	May-40
2416 Lake Orange Drive	Orlando, FL		—			1,435,301			6,174,642		694,147			1,435,301		6,868,789		8,304,090		1,568,189		2006	May-40
6200 Lee Vista Boulevard	Orlando, FL		—			903,701			—		5,660,760			925,671		5,638,790		6,564,461		1,886,420		2001	May-40
6501 Lee Vista Boulevard	Orlando, FL		—			872,550			2,526,043		283,738			872,550		2,809,781		3,682,331		132,760		2012	May-40
6918 Presidents Drive	Orlando, FL		—			903,701			—		3,790,427			830,953		3,863,175		4,694,128		1,001,454		2006	May-40
6923 Lee Vista Boulevard	Orlando, FL		—			1,443,510			6,775,194		486,102			1,457,286		7,247,521		8,704,807		1,546,051		2006	May-40
7022 TPC Drive	Orlando, FL		—			1,431,489			8,002,539		815,640			1,445,807		8,803,861		10,249,668		1,910,017		2006	May-40
7100 TPC Drive	Orlando, FL		—			1,553,537			5,702,243		409,929			1,570,863		6,094,846		7,665,709		1,305,001		2006	May-40
7101 TPC Drive	Orlando, FL		—			1,931,697			6,388,203		2,052,761			1,932,004		8,440,657		10,372,661		3,137,431		2004	May-40
7315 Kingspointe Parkway	Orlando, FL		—			4,295,972			15,564,905		4,370,731			4,295,972		19,935,637		24,231,609		3,695,236		2010	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
8201 Chancellor Drive	Orlando, FL		—			332,992			—		2,825,284			373,500		2,784,776		3,158,276		499,506		2006	May-40
851 Gills Drive	Orlando, FL		—			443,989			—		2,907,134			464,800		2,886,323		3,351,123		504,060		2006	May-40
950 Gills Drive	Orlando, FL		—			574,831			—		2,763,949			587,319		2,751,461		3,338,780		1,175,031		1999	May-40
9550 Satellite Boulevard	Orlando, FL		—			252,850			1,297,923		141,775			252,850		1,439,698		1,692,548		587,158		1989	May-40
9600 Satellite Boulevard	Orlando, FL		—			405,362			1,146,546		367,265			405,362		1,513,811		1,919,173		602,972		1989	May-40
9700 Satellite Boulevard	Orlando, FL		—			838,853			—		4,084,540			767,953		4,155,440		4,923,393		1,068,841		2006	May-40
13 Centennial Drive	Peabody, MA		—			1,203,464			7,752,384		489,439			1,203,464		8,241,823		9,445,287		564,671		2013	May-40
1 Crescent Drive	Philadelphia, PA		—			567,280			—		14,532,238			347,892		14,751,626		15,099,518		3,320,612		2004	May-40
150 Rouse Boulevard	Philadelphia, PA		—			567,531			—		13,999,552			569,349		13,997,734		14,567,083		916,894		2011	May-40
3 Crescent Drive	Philadelphia, PA		—			214,726			—		22,969,180			417,823		22,766,083		23,183,906		3,161,332		2008	May-40
4000 S 26th Street	Philadelphia, PA		—			51,784			—		7,097,969			616,467		6,533,286		7,149,753		430,422		2011	May-40
4050 S 26th Street	Philadelphia, PA		—			46,301			—		7,019,911			616,670		6,449,542		7,066,212		532,259		2011	May-40
4300 South 26th Street	Philadelphia, PA		—			402,673			—		34,847,713			413,030		34,837,356		35,250,386		4,791,398		2008	May-40
4751 League Island Boulevard	Philadelphia, PA		—			992,965			331,924		7,619,754			613,248		8,331,395		8,944,643		2,283,334		2003	May-40
4775 League Island Boulevard	Philadelphia, PA		—			891,892			—		5,534,823			366,982		6,059,733		6,426,715		1,140,706		2006	May-40
5 Crescent Drive	Philadelphia, PA		—			1,765,341			—		75,019,430			1,897,303		74,887,468		76,784,771		3,922,424		2011	May-40
8th & Walnut Streets	Philadelphia, PA		43,066,058			734,275			—		45,262,758			—		45,997,033		45,997,033		1,390,925		2011	May-40
2626 South 7th Street	Phoenix, AZ		—			2,519,510			3,798,560		3,422,003			2,519,510		7,220,563		9,740,073		583,306		2012	May-40
4207 E. Cotton Center Boulevard	Phoenix, AZ		—			1,409,908			4,680,808		1,100,202			1,410,248		5,780,670		7,190,918		1,587,802		2007	May-40
4217 E. Cotton Center Boulevard	Phoenix, AZ		—			6,920,980			10,045,599		3,757,067			6,690,321		14,033,325		20,723,646		3,476,778		2007	May-40
4303 E. Cotton Center Boulevard	Phoenix, AZ		—			2,619,964			9,675,711		43,651			2,619,964		9,719,362		12,339,326		2,134,793		2007	May-40
4313 E. Cotton Center Boulevard	Phoenix, AZ		—			3,895,539			16,724,283		1,467,793			3,895,539		18,192,076		22,087,615		4,356,375		2007	May-40
4405 E. Cotton Center Boulevard	Phoenix, AZ		—			2,646,318			9,697,439		841,102			2,646,318		10,538,541		13,184,859		2,256,929		2007	May-40
4410 E. Cotton Center Boulevard	Phoenix, AZ		—			4,758,484			10,559,563		5,592,969			4,765,172		16,145,844		20,911,016		3,912,801		2007	May-40
4415 E. Cotton Center Boulevard	Phoenix, AZ		—			1,749,957			3,667,748		465,844			1,749,957		4,133,592		5,883,549		976,217		2007	May-40
4425 E. Cotton Center Boulevard	Phoenix, AZ		—			7,318,457			24,549,401		(413,426		)	7,318,457		24,135,975		31,454,432		4,581,188		2007	May-40
4435 E. Cotton Center Boulevard	Phoenix, AZ		—			1,910,584			1,954,020		2,166,648			1,911,045		4,120,208		6,031,253		1,223,552		2007	May-40
4550 South 44th Street	Phoenix, AZ		—			5,380,972			—		9,257,593			6,391,283		8,247,282		14,638,565		2,562,671		2007	May-40
4610 South 44th Street	Phoenix, AZ		—			6,539,310			—		10,331,533			6,827,288		10,043,555		16,870,843		2,077,725		2007	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
4750 South 44th Place	Phoenix, AZ		—			3,756,307			8,336,400		4,190,610			3,761,587		12,521,730		16,283,317		2,536,167		2007	May-40
563 South 63rd Avenue	Phoenix, AZ		—			5,523,427			14,581,705		8,217,040			5,636,070		22,686,102		28,322,172		844,574		2013	May-40
9801 South 51st Street	Phoenix, AZ		—			2,225,839			2,059,235		1,396,072			2,225,839		3,455,307		5,681,146		510,995		2012	May-40
Cotton Center Building 18	Phoenix, AZ		—			11,222,938			—		15,263,279			11,318,033		15,168,184		26,486,217		844,115		2012	May-40
1000 Klein Road	Plano, TX		—			706,660			5,894,330		248,060			706,660		6,142,391		6,849,051		254,236		2013	May-40
1901 10th Street	Plano, TX		—		*	555,168			6,401,789		379,756			555,168		6,781,545		7,336,713		306,374		2013	May-40
1909 10th Street	Plano, TX		—		*	551,706			5,797,440		312,150			551,706		6,109,590		6,661,296		291,732		2013	May-40
3605 East Plano Parkway	Plano, TX		—			1,047,996			9,218,748		360,013			1,047,996		9,578,760		10,626,756		408,139		2013	May-40
3701 East Plano Parkway	Plano, TX		—			877,564			7,460,686		334,916			877,564		7,795,601		8,673,165		339,796		2013	May-40
800 Klein Road	Plano, TX		—			580,456			5,681,283		271,462			580,456		5,952,745		6,533,201		258,314		2013	May-40
900 Klein Road	Plano, TX		—			723,534			6,004,923		349,690			723,534		6,354,613		7,078,147		287,366		2013	May-40
9801 80th Avenue	Pleasant Prairie, WI		—			1,692,077			7,934,794		336,795			1,689,726		8,273,940		9,963,666		3,403,243		1994	May-40
14630-14650 28th Avenue North	Plymouth, MN		—			198,205			1,793,422		965,751			198,205		2,759,172		2,957,377		1,165,832		1978	May-40
2920 Northwest Boulevard	Plymouth, MN		—			392,026			3,433,678		747,609			384,235		4,189,078		4,573,313		1,667,699		1997	May-40
5905 Trenton Lane North	Plymouth, MN		—			1,616,360			4,487,462		487,026			1,616,360		4,974,487		6,590,847		246,351		2013	May-40
6055 Nathan Lane North	Plymouth, MN		—		*	1,327,017			4,527,404		476,115			1,327,017		5,003,519		6,330,536		235,723		2013	May-40
1400 SW 6th Court	Pompano Beach, FL		—			1,157,049			4,620,956		1,332,594			1,157,049		5,953,550		7,110,599		2,364,597		1986	May-40
1405 SW 6th Court	Pompano Beach, FL		—			392,138			1,565,787		444,197			392,138		2,009,985		2,402,123		929,892		1985	May-40
1500 SW 5th Court	Pompano Beach, FL		—			972,232			3,892,085		587,174			972,232		4,479,259		5,451,491		1,890,450		1957	May-40
1501 SW 5th Court	Pompano Beach, FL		—			203,247			811,093		364,776			203,247		1,175,870		1,379,117		456,473		1990	May-40
1601 SW 5th Court	Pompano Beach, FL		—			203,247			811,093		96,949			203,247		908,043		1,111,290		387,208		1990	May-40
1651 SW 5th Court	Pompano Beach, FL		—			203,247			811,093		183,052			203,247		994,146		1,197,393		405,613		1990	May-40
2201-2215 NW 30th Place	Pompano Beach, FL		—			1,120,328			3,427,358		99,226			1,120,328		3,526,584		4,646,912		149,765		2013	May-40
2250-2270 NW 30th Place	Pompano Beach, FL		—			993,015			2,423,174		108,273			993,015		2,531,447		3,524,462		117,804		2013	May-40
2280-2300 NW 30th Place	Pompano Beach, FL		—			906,947			2,157,802		158,626			906,947		2,316,429		3,223,376		102,313		2013	May-40
2301-2329 NW 30th Place	Pompano Beach, FL		—			1,268,707			3,079,811		153,822			1,268,707		3,233,633		4,502,340		149,476		2013	May-40
3000 NW 25th Avenue	Pompano Beach, FL		—			1,087,554			2,897,117		155,731			1,087,554		3,052,848		4,140,402		151,869		2013	May-40
3001-3037 NW 25th Avenue	Pompano Beach, FL		—			1,548,542			3,512,041		271,076			1,548,542		3,783,118		5,331,660		174,062		2013	May-40
3012-3050 NW 25th Avenue	Pompano Beach, FL		—			1,112,781			2,763,862		199,220			1,112,781		2,963,081		4,075,862		130,093		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
595 SW 13th Terrace	Pompano Beach, FL		—			359,933			1,437,116		720,249			359,933		2,157,365		2,517,298		949,834		1984	May-40
601 SW 13th Terrace	Pompano Beach, FL		—			164,413			655,933		279,326			164,413		935,259		1,099,672		463,027		1984	May-40
605 SW 16th Terrace	Pompano Beach, FL		—			310,778			1,238,324		421,172			310,178		1,660,096		1,970,274		703,981		1965	May-40
1920 West Baseline Road	Rialto, CA		—			9,361,943			17,970,709		149,839			9,413,332		18,069,159		27,482,491		60,280		2014	May-40
301 Hill Carter Parkway	Richmond, VA		—			659,456			4,836,010		159,898			659,456		4,995,908		5,655,364		2,504,321		1989	May-40
4101-4127 Carolina Avenue	Richmond, VA		—			310,854			2,279,597		1,094,160			310,854		3,373,757		3,684,611		1,641,297		1973	May-40
4201-4261 Carolina Avenue	Richmond, VA		—			693,203			5,083,493		1,937,811			693,203		7,021,304		7,714,507		3,545,615		1975	May-40
4263-4299 Carolina Avenue	Richmond, VA		—			256,203			2,549,649		2,213,314			256,203		4,762,963		5,019,166		2,149,744		1976	May-40
4263F-N. Carolina Avenue	Richmond, VA		—			91,476			—		1,884,374			91,599		1,884,251		1,975,850		862,218		1975	May-40
4301-4335 Carolina Avenue	Richmond, VA		—			223,696			1,640,435		2,738,782			223,696		4,379,217		4,602,913		1,701,198		1978	May-40
4337-4379 Carolina Avenue	Richmond, VA		—			325,303			2,385,557		1,430,286			325,303		3,815,843		4,141,146		1,930,047		1979	May-40
4401-4445 Carolina Avenue	Richmond, VA		—			615,038			4,510,272		506,842			615,038		5,017,114		5,632,152		2,486,608		1988	May-40
4447-4491 Carolina Avenue	Richmond, VA		—			454,056			2,729,742		446,660			454,056		3,176,402		3,630,458		1,665,452		1987	May-40
4501-4549 Carolina Avenue	Richmond, VA		—			486,166			3,565,211		553,422			486,166		4,118,633		4,604,799		2,015,290		1981	May-40
4551-4593 Carolina Avenue	Richmond, VA		—			474,360			3,478,646		984,318			474,360		4,462,964		4,937,324		2,268,592		1982	May-40
4601-4643 Carolina Avenue	Richmond, VA		—			652,455			4,784,675		794,310			652,455		5,578,985		6,231,440		2,970,780		1985	May-40
4645-4683 Carolina Avenue	Richmond, VA		—			404,616			2,967,187		541,284			404,616		3,508,471		3,913,087		1,739,814		1985	May-40
4717-4729 Eubank Road	Richmond, VA		—			449,447			3,294,697		2,230,770			452,263		5,522,651		5,974,914		2,518,602		1978	May-40
510 Eastpark Court	Richmond, VA		—			261,961			2,110,874		381,903			262,210		2,492,528		2,754,738		1,179,196		1989	May-40
520 Eastpark Court	Richmond, VA		—			486,118			4,083,582		703,431			486,598		4,786,533		5,273,131		2,068,460		1989	May-40
530 Eastpark Court	Richmond, VA		—			266,883			—		2,599,777			334,772		2,531,888		2,866,660		1,085,121		1999	May-40
540 Eastpark Court	Richmond, VA		—			742,300			—		5,415,233			1,066,839		5,090,694		6,157,533		901,938		2007	May-40
5600-5626 Eastport Boulevard	Richmond, VA		—			489,941			3,592,900		595,652			489,941		4,188,552		4,678,493		1,923,946		1989	May-40
5601-5659 Eastport Boulevard	Richmond, VA		—			705,660			—		4,921,067			720,100		4,906,627		5,626,727		2,395,221		1996	May-40
5650-5674 Eastport Boulevard	Richmond, VA		—			644,384			4,025,480		353,257			644,384		4,378,737		5,023,121		2,149,329		1990	May-40
5700 Eastport Boulevard	Richmond, VA		—			408,729			2,697,348		748,269			408,729		3,445,617		3,854,346		1,921,311		1990	May-40
5701-5799 Eastport Boulevard	Richmond, VA		—			694,644			—		5,983,122			700,503		5,977,263		6,677,766		2,290,808		1998	May-40
5900 Eastport Boulevard	Richmond, VA		—			676,661			—		4,988,588			687,898		4,977,351		5,665,249		2,353,402		1997	May-40
6000 Eastport Boulevard	Richmond, VA		—			872,901			—		7,486,258			901,666		7,457,493		8,359,159		1,273,473		1997	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
2020 US Highway 301 South	Riverview, FL		—			1,233,639			13,608,485		341,435			1,233,800		13,949,759		15,183,559		3,112,479		2006	May-40
6530 Judge Adams Road	Rock Creek, NC		—			305,821			—		4,967,815			335,061		4,938,575		5,273,636		1,973,748		1999	May-40
6532 Judge Adams Road	Rock Creek, NC		—			354,903			—		4,017,099			399,988		3,972,014		4,372,002		1,752,125		1997	May-40
13098 George Weber Drive	Rogers, MN		—			895,811			6,004,189		645,566			895,811		6,649,755		7,545,566		857,364		2011	May-40
13220 Wilfred Lane	Rogers, MN		—			508,532			—		11,083,540			1,396,324		10,195,748		11,592,072		282,319		2014	May-40
13225 Brockton Lane	Rogers, MN		—			1,048,093			—		10,389,897			1,066,159		10,371,831		11,437,990		167,178		2014	May-40
1070 Windham Parkway	Romeoville, IL		—			8,672,143			24,144,864		870,108			8,672,143		25,014,972		33,687,115		1,258,059		2012	May-40
1550 Central Avenue	Roselle, IL		—		*	2,884,492			10,439,793		484,562			2,884,492		10,924,355		13,808,847		517,282		2013	May-40
1135 Aviation Place	San Fernando, CA		—			3,035,034			2,844,962		460,618			3,035,034		3,305,580		6,340,614		136,765		2013	May-40
8715 Bollman Place	Savage, MD		—			1,263,237			2,633,210		99,509			1,263,237		2,732,719		3,995,956		116,732		2013	May-40
8501 East Raintree Drive	Scottsdale, AZ		—			4,076,412			—		27,621,159			4,115,137		27,582,434		31,697,571		7,982,111		2005	May-40
1150 Gateway Drive	Shakopee, MN		—			1,126,865			5,684,178		—			1,126,865		5,684,178		6,811,043		320,809		2012	May-40
5555 12th Avenue East	Shakopee, MN		—			887,285			5,321,200		206,165			887,285		5,527,365		6,414,650		332,861		2012	May-40
1210 Champion Way	Sharonville, OH		—			1,337,271			6,135,118		489,270			1,337,271		6,624,389		7,961,660		601,653		2013	May-40
9300 Olde Scotland Road	Shippensburg, PA		—			10,232,633			—		84,019,815			13,183,027		81,069,421		94,252,448		1,152,144		2014	May-40
3990 Heritage Oak Court	Simi Valley, CA		—		*	1,964,140			10,667,267		345,689			1,964,140		11,012,956		12,977,096		431,004		2013	May-40
3654-3668 Swenson Avenue	St. Charles, IL		—			643,639			1,645,058		141,970			643,639		1,787,028		2,430,667		94,498		2013	May-40
3701 Illinois Avenue	St. Charles, IL		—			672,500			1,288,924		117,765			672,500		1,406,689		2,079,189		79,036		2013	May-40
3950-3980 Swenson Avenue	St. Charles, IL		—			851,080			3,027,753		149,571			851,080		3,177,324		4,028,404		148,467		2013	May-40
1501 102nd Avenue North	St. Petersburg, FL		—		*	283,474			2,230,868		165,205			283,474		2,396,072		2,679,546		100,561		2013	May-40
1527 102nd Avenue North	St. Petersburg, FL		—		*	374,284			2,987,226		207,177			374,284		3,194,403		3,568,687		133,429		2013	May-40
1551 102nd Avenue North	St. Petersburg, FL		—		*	699,797			5,214,438		540,106			699,797		5,754,544		6,454,341		228,445		2013	May-40
6900 Harbour View Boulevard	Suffolk, VA		—			904,052			—		8,778,897			807,006		8,875,943		9,682,949		2,004,053		2006	May-40
6920 Harbour View Boulevard	Suffolk, VA		—			603,391			—		6,707,341			2,628,635		4,682,097		7,310,732		383,147		2005	May-40
6950 Harbour View Boulevard	Suffolk, VA		—			929,844			—		6,499,290			794,848		6,634,286		7,429,134		1,539,151		2004	May-40
1516 Fryar Avenue	Sumner, WA		—			1,675,402			5,079,543		301,095			1,675,402		5,380,638		7,056,040		289,202		2013	May-40
1301 International Parkway	Sunrise, FL		—			5,100,162			24,219,956		7,125,865			5,100,791		31,345,192		36,445,983		6,226,037		2006	May-40
13621 NW 12th Street	Sunrise, FL		—			5,570,820			9,454,900		2,667,264			5,570,820		12,122,164		17,692,984		3,493,510		2008	May-40
13630 NW 8th Street	Sunrise, FL		—			659,797			2,596,275		455,772			659,825		3,052,018		3,711,843		1,212,332		1991	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
13650 NW 8th Street	Sunrise, FL		—			558,223			2,171,930		321,767			558,251		2,493,669		3,051,920		999,846		1991	May-40
111 Kelsey Lane	Tampa, FL		—			359,540			1,461,850		1,582,199			359,540		3,044,049		3,403,589		1,069,477		1990	May-40
131 Kelsey Lane	Tampa, FL		—			511,463			—		4,437,886			559,527		4,389,822		4,949,349		2,531,005		1985	May-40
150-182 Kelsey Lane	Tampa, FL		—			403,541			—		5,260,899			1,181,609		4,482,831		5,664,440		848,617		2006	May-40
200-34 Kelsey Lane	Tampa, FL		—			330,097			—		3,385,332			933,362		2,782,067		3,715,429		638,646		2005	May-40
3102,3104,3110 Cherry Palm Drive	Tampa, FL		—			503,767			2,787,585		1,308,846			503,767		4,096,431		4,600,198		1,982,773		1986	May-40
3401-3409 Cragmont Drive	Tampa, FL		—			556,952			3,849,236		2,948			556,952		3,852,184		4,409,136		203,074		2012	May-40
3502 Roga Boulevard	Tampa, FL		—			201,600			1,263,131		50,142			201,600		1,313,273		1,514,873		70,591		2012	May-40
3505 Cragmont Drive	Tampa, FL		—			936,336			7,155,520		1,313			936,336		7,156,833		8,093,169		413,118		2012	May-40
3608 Queen Palm Drive	Tampa, FL		—			650,384			4,764,301		32,287			650,384		4,796,588		5,446,972		262,219		2012	May-40
4502 Woodland Corporate Boulevard	Tampa, FL		—			1,035,422			—		3,547,955			1,071,535		3,511,842		4,583,377		1,386,489		1999	May-40
4503 Woodland Corporate Boulevard	Tampa, FL		—			619,913			—		2,751,187			619,913		2,751,187		3,371,100		925,297		2002	May-40
4505 Woodland Corporate Boulevard	Tampa, FL		—			516,594			—		2,443,438			716,594		2,243,438		2,960,032		864,064		2002	May-40
4508 Woodland Corporate Boulevard	Tampa, FL		—			498,598			—		3,307,705			556,887		3,249,416		3,806,303		1,221,367		2000	May-40
4511 Woodland Corporate Boulevard	Tampa, FL		—			516,594			—		2,311,508			686,594		2,141,508		2,828,102		718,070		2002	May-40
4520 Seedling Circle	Tampa, FL		—			854,797			42,131		2,773,264			854,797		2,815,395		3,670,192		745,181		2003	May-40
4630 Woodland Corporate Boulevard	Tampa, FL		—			943,169			—		14,177,882			1,560,099		13,560,952		15,121,051		5,177,038		2000	May-40
4631 Woodland Corporate Boulevard	Tampa, FL		—			1,453,367			—		13,806,242			1,908,792		13,350,817		15,259,609		2,062,168		2006	May-40
501 US Highway 301 South	Tampa, FL		—			898,884			—		3,438,023			900,508		3,436,399		4,336,907		1,056,691		2004	May-40
5250 Eagle Trail Drive	Tampa, FL		—			952,860			—		3,472,043			952,860		3,472,043		4,424,903		1,409,987		1998	May-40
5501-5519 Pioneer Park Boulevard	Tampa, FL		—			162,000			1,613,000		974,528			262,416		2,487,112		2,749,528		1,199,849		1981	May-40
5690-5694 Crenshaw Street	Tampa, FL		—			181,923			1,812,496		1,024,573			181,923		2,837,069		3,018,992		1,089,555		1979	May-40
701-725 South US Highway 301	Tampa, FL		—			419,683			—		3,932,756			661,680		3,690,759		4,352,439		1,389,384		2000	May-40
7621 Bald Cypress Place (Building N)	Tampa, FL		—			716,580			132,773		605,762			447,498		1,007,617		1,455,115		287,125		2001	May-40
7724 Woodland Center Boulevard	Tampa, FL		—			235,893			—		2,247,071			235,894		2,247,070		2,482,964		850,183		1998	May-40
7725 Woodland Center Boulevard	Tampa, FL		—			553,335			—		3,723,937			771,501		3,505,771		4,277,272		1,280,776		1999	May-40
7802-50 Woodland Center Boulevard	Tampa, FL		—			357,364			—		3,061,920			506,949		2,912,335		3,419,284		1,069,963		1999	May-40
7851-7861 Woodland Center Boulevard	Tampa, FL		—			548,905			2,241,627		273,640			548,905		2,515,267		3,064,172		603,840		2006	May-40
7852-98 Woodland Center Boulevard	Tampa, FL		—			357,364			—		2,773,785			506,949		2,624,200		3,131,149		934,043		1999	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
7920 Woodland Center Boulevard	Tampa, FL		—			1,082,648			2,445,444		434,554			1,082,648		2,879,998		3,962,646		1,134,463		1997	May-40
7930, 8010-20 Woodland Center Boulevard	Tampa, FL		—			1,408,478			5,247,246		1,124,428			1,408,478		6,371,674		7,780,152		2,846,537		1990	May-40
8001 Woodland Center Boulevard	Tampa, FL		—			350,406			—		2,298,881			438,061		2,211,226		2,649,287		862,026		1999	May-40
8110 Anderson Road	Tampa, FL		—			912,663			5,425,143		261,295			912,663		5,686,438		6,599,101		310,710		2012	May-40
8112-42 Woodland Center Boulevard	Tampa, FL		—			513,263			3,230,239		649,274			513,263		3,879,513		4,392,776		1,910,874		1995	May-40
8130 Anderson Road	Tampa, FL		—			655,668			4,132,076		63,891			655,668		4,195,967		4,851,635		267,542		2012	May-40
8154-8198 Woodland Center Boulevard	Tampa, FL		—			399,088			2,868,834		899,472			399,088		3,768,306		4,167,394		1,627,975		1988	May-40
8212 Woodland Center Boulevard	Tampa, FL		—			820,882			2,322,720		488,973			820,882		2,811,693		3,632,575		1,045,591		1996	May-40
8401-8408 Benjamin Road	Tampa, FL		—			789,651			4,454,648		301,268			611,626		4,933,941		5,545,567		2,599,279		1986	May-40
8705 Henderson Road	Tampa, FL		—			4,303,870			23,688,409		306,814			4,304,102		23,994,992		28,299,094		6,074,130		2006	May-40
8715 Henderson Road	Tampa, FL		—			3,343,910			18,325,599		487,389			3,344,090		18,812,808		22,156,898		5,458,387		2006	May-40
8725 Henderson Road	Tampa, FL		—			3,167,787			19,126,318		632,200			3,167,958		19,758,347		22,926,305		5,503,373		2006	May-40
8735 Henderson Road	Tampa, FL		—			3,166,130			18,735,573		1,292,137			3,166,300		20,027,540		23,193,840		5,508,513		2006	May-40
8745 Henderson Road	Tampa, FL		—			2,050,439			11,173,008		93,869			2,050,548		11,266,768		13,317,316		2,293,301		2006	May-40
8900-34 Brittany Way	Tampa, FL		—			537,194			—		3,962,378			978,019		3,521,553		4,499,572		951,035		2005	May-40
8921 Brittany Way	Tampa, FL		—			224,369			1,063,882		939,473			254,493		1,973,231		2,227,724		777,596		1998	May-40
9001-9015 Brittany Way	Tampa, FL		—			209,841			—		1,811,678			364,514		1,657,005		2,021,519		744,344		2000	May-40
9002-9036 Brittany Way	Tampa, FL		—			492,320			—		3,511,381			899,284		3,104,417		4,003,701		1,109,566		2004	May-40
901-933 US Highway 301 South	Tampa, FL		—			500,391			—		4,254,173			840,314		3,914,250		4,754,564		1,671,876		2001	May-40
9020 King Palm Drive	Tampa, FL		—			1,718,496			11,697,381		872,478			1,718,496		12,569,859		14,288,355		669,758		2012	May-40
910-926 Chad Lane	Tampa, FL		—			201,771			—		2,616,963			628,237		2,190,497		2,818,734		412,480		2006	May-40
9110 King Palm Drive	Tampa, FL		—			1,203,200			7,979,540		221,983			1,203,200		8,201,523		9,404,723		492,958		2012	May-40
9203 King Palm Drive	Tampa, FL		—			754,832			4,966,864		92,249			754,832		5,059,113		5,813,945		405,712		2012	May-40
9306-24 East Broadway Avenue	Tampa, FL		—			450,440			—		3,303,369			486,004		3,267,805		3,753,809		565,618		2007	May-40
9319 Peach Palm Drive	Tampa, FL		—			612,536			4,168,473		9,700			612,536		4,178,173		4,790,709		224,848		2012	May-40
9704 Solar Drive	Tampa, FL		—			374,548			1,354,800		128,373			374,548		1,483,173		1,857,721		79,076		2012	May-40
9945 Currie Davis Drive	Tampa, FL		—			1,134,286			9,241,807		380,833			1,134,286		9,622,639		10,756,925		404,236		2013	May-40
1858 E Encanto Drive	Tempe, AZ		—		*	877,611			4,485,427		190,934			877,611		4,676,361		5,553,972		215,576		2013	May-40
475 W Vaughn Street	Tempe, AZ		—			1,112,245			2,260,348		134,556			1,112,245		2,394,904		3,507,149		124,956		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
921 South Park Lane	Tempe, AZ		—			1,192,820			1,580,155		477,881			1,192,820		2,058,037		3,250,857		215,318		2011	May-40
8313 West Pierce Street	Tolleson, AZ		—			2,295,090			9,079,811		3,224,097			2,295,090		12,303,908		14,598,998		3,172,179		2007	May-40
8591 West Washington Street	Tolleson, AZ		—			1,574,912			7,308,021		274,301			1,574,912		7,582,322		9,157,234		557,915		2012	May-40
8601 West Washington Street	Tolleson, AZ		—			1,524,603			6,352,070		926,360			1,524,603		7,278,430		8,803,033		596,068		2012	May-40
5111 S Royal Atlanta Drive	Tucker, GA		—		*	435,776			1,875,685		375,872			435,776		2,251,558		2,687,334		126,111		2013	May-40
5151 S Royal Atlanta Drive	Tucker, GA		—		*	345,061			1,428,840		203,538			345,061		1,632,378		1,977,439		105,687		2013	May-40
1457 Miller Store Road	Virginia Beach, VA		—			473,689			2,663,045		376,763			474,746		3,038,751		3,513,497		953,946		2003	May-40
200 Golden Oak Court	Virginia Beach, VA		—			1,116,693			6,770,480		2,239,720			1,116,693		9,010,200		10,126,893		3,839,287		1988	May-40
208 Golden Oak Court	Virginia Beach, VA		—			965,177			6,728,717		2,174,995			965,177		8,903,712		9,868,889		3,840,691		1989	May-40
2809 South Lynnhaven Road	Virginia Beach, VA		—			953,590			6,142,742		1,944,512			953,590		8,087,254		9,040,844		3,219,121		1987	May-40
484 Viking Drive	Virginia Beach, VA		—			891,753			3,607,890		614,231			891,753		4,222,120		5,113,873		1,756,749		1987	May-40
629 Phoenix Drive	Virginia Beach, VA		—			371,694			2,108,097		224,602			371,694		2,332,699		2,704,393		1,022,536		1996	May-40
1100 17th Street NW	Washington, DC		—			16,558,660			32,223,978		1,393,698			16,558,660		33,617,676		50,176,336		4,209,304		2011	May-40
2100 M Street NW	Washington, DC		—			70,000,000			55,123,783		187,024			70,000,000		55,310,807		125,310,807		4,154,200		2013	May-40
1200 Liberty Ridge Drive	Wayne, PA		—			6,215,667			—		9,363,338			5,223,660		10,355,345		15,579,005		4,284,684		2001	May-40
1500 Liberty Ridge Drive	Wayne, PA		—			8,287,555			—		32,195,630			11,636,499		28,846,687		40,483,186		9,511,047		2002	May-40
825 Duportail Road	Wayne, PA		—			5,536,619			16,179,213		5,024,029			5,539,281		21,200,581		26,739,862		8,512,691		1979	May-40
400-500 Brandywine Parkway	West Chester, PA		—			845,846			6,809,025		656,822			845,846		7,465,848		8,311,694		3,244,935		1988	May-40
600 Brandywine Parkway	West Chester, PA		—			664,899			5,352,410		889,805			664,899		6,242,216		6,907,115		2,747,719		1988	May-40
1400 Powis Court	West Chicago, IL		—		*	578,314			2,448,562		72,418			578,314		2,520,981		3,099,295		98,567		2013	May-40
1 Kings Hill Avenue	West Malling, UK		—			4,288,389			—		9,705,320			3,898,275		10,095,435		13,993,710		2,233,844		2006	May-40
42 Kings Hill Avenue	West Malling, UK		—			5,397,739			—		12,477,732			4,232,077		13,643,395		17,875,472		2,587,023		2005	May-40
Liberty Square Retail Blocks	West Malling, UK		—			559,590			5,113,902		3,397,215			1,121,039		7,949,669		9,070,708		1,871,518		2006	May-40
1400 Northpoint Parkway	West Palm Beach, FL		—		*	2,454,972			5,312,829		276,501			2,454,972		5,589,331		8,044,303		293,340		2013	May-40
300 Northpoint Parkway	West Palm Beach, FL		—		*	1,177,064			2,102,451		125,705			1,177,064		2,228,157		3,405,221		111,003		2013	May-40
400 Northpoint Parkway	West Palm Beach, FL		—		*	1,029,595			1,728,187		123,734			1,029,595		1,851,922		2,881,517		84,638		2013	May-40
2935 West Corporate Lakes Boulevard	Weston, FL		—			4,682,521			25,905,125		558,332			4,682,521		26,463,458		31,145,979		959,558		2013	May-40
2945 West Corporate Lakes Boulevard	Weston, FL		—			2,345,242			13,973,765		273,455			2,345,242		14,247,221		16,592,463		510,298		2013	May-40
43-47 Hintz Road	Wheeling, IL		—		*	2,051,093			18,283,479		536,842			2,051,093		18,820,323		20,871,416		719,097		2013	May-40
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
OPERATING PROPERTIES
10 Cornell Place	Wilmington, MA		—			598,120			2,142,735		232,897			598,120		2,375,632		2,973,752		127,256		2013	May-40
265 Ballardvale Street	Wilmington, MA		—			868,433			4,358,997		345,915			868,433		4,704,913		5,573,346		352,364		2013	May-40
Subtotal Operating Real Estate			$	60,746,274		$	1,121,456,221		$	2,838,135,653	$	2,574,074,794		$	1,189,759,562	$	5,343,907,106	$	6,533,666,668	$	1,182,568,534
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
Development Properties
330 South Royal Lane	Coppell, TX		$	—		$	2,091,426		$	—	$	7,958,079		$	—	$	10,049,505	$	10,049,505	$	—	2014	N/A
11020 Holly Lane	Dayton, MN		—			2,536,731			—		6,271,776			—		8,808,507		8,808,507		—		2014	N/A
333 Howard Avenue	Des Plaines, IL		—			7,928,724			—		1,619,989			—		9,548,713		9,548,713		—		2014	N/A
120 Caliber Ridge Drive	Greer, SC		—			1,243,100			—		5,263,759			—		6,506,859		6,506,859		—		2014	N/A
130 Caliber Ridge Drive	Greer, SC		—			1,171,160			—		628,480			—		1,799,640		1,799,640		—		2014	N/A
140 Caliber Ridge Drive	Greer, SC		—			1,243,100			—		6,249,949			—		7,493,049		7,493,049		—		2013	N/A
11835 Newgate Boulevard	Hagerstown, MD		—			14,121,622			—		14,631,418			—		28,753,040		28,753,040		—		2014	N/A
7460 New Ridge Road	Hanover, MD		—			3,785,446			—		7,118,710			—		10,904,156		10,904,156		—		2013	N/A
7462 New Ridge Road	Hanover, MD		—			4,059,337			—		7,115,061			—		11,174,398		11,174,398		—		2013	N/A
1050 Greens Parkway	Houston, TX		—			973,482			—		3,588,294			—		4,561,776		4,561,776		—		2013	N/A
10720 West Sam Houston Pkwy N	Houston, TX		—			3,871,875			—		21,894,894			—		25,766,769		25,766,769		—		2014	N/A
11220 Ella Boulevard	Houston, TX		—			1,505,855			—		7,268,433			—		8,774,288		8,774,288		—		2013	N/A
8303 Fallbrook Drive	Houston, TX		—			4,613,370			—		13,220,947			—		17,834,317		17,834,317		—		2013	N/A
11150 NW 122nd Street	Medley, FL		—			6,627,899			—		412,601			—		7,040,500		7,040,500		—		2014	N/A
11250 NW 122nd Street	Medley, FL		—			4,798,886			—		5,641,003			—		10,439,889		10,439,889		—		2014	N/A
11500 NW 122nd Street	Miami, FL		—			1,623,293			—		10,917,535			—		12,540,828		12,540,828		—		2013	N/A
10020 South Reinhart Drive	Oak Creek, WI		—			1,516,764			—		6,341,820			—		7,858,584		7,858,584		—		2014	N/A
1200 Intrepid Avenue	Philadelphia, PA		—			16,169			—		2,752,441			—		2,768,610		2,768,610		—		2014	N/A
201 Rouse Boulevard	Philadelphia, PA		—			243,905			—		22,485,941			—		22,729,846		22,729,846		—		2013	N/A
4000 S. 26th Street	Philadelphia, PA		—			1,255,507			—		8,402,214			—		9,657,721		9,657,721		—		2014	N/A
4701 League Island Boulevard	Philadelphia, PA		—			419,107			—		1,143,242			—		1,562,349		1,562,349		—		2014	N/A
5800 Eastport Boulevard	Richmond, VA		—			604,146			—		5,974,279			—		6,578,425		6,578,425		—		2014	N/A
1720 W. Rio Salado Parkway	Tempe, AZ		—			2,629,020			—		577,191			—		3,206,211		3,206,211		—		2014	N/A
1850 W Rio Salado Parkway	Tempe, AZ		—			3,975,600			—		19,642,158			—		23,617,758		23,617,758		—		2013	N/A
1910 W. Rio Salado Parkway	Tempe, AZ		—			4,693,504			—		12,742,133			—		17,435,637		17,435,637		—		2014	N/A
Subtotal Development in Progress			$	—		$	77,549,028		$	—	$	199,862,347		$	—	$	277,411,375	$	277,411,375	$	—
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
LAND HELD FOR DEVELOPMENT
4551 New York Avenue Land	Arlington, TX		$	—		$	4,754,659		$	—	$	24,126		$	4,778,784	$	—	$	4,778,784	$	—	2013	N/A
Mill Creek Road Land	Bethlehem, PA		—			18,548,585			—		1,815,956			20,364,541		—		20,364,541		—		2012	N/A
Boca Colannade Yamato Road	Boca Raton, FL		—			2,039,735			—		554,823			2,594,558		—		2,594,558		—		1998	N/A
12912 Virkler Drive Land	Charlotte, NC		—			208,646			—		10,086			218,732		—		218,732		—		2010	N/A
Charlotte Distribution Center Land-Lot 1	Charlotte, NC		—			654,713			—		—			654,713		—		654,713		—		2011	N/A
Shopton Ridge Business Park Land	Charlotte, NC		—			2,058,588			—		—			2,058,588		—		2,058,588		—		2014	N/A
Holly Lane North Land	Dayton, MN		—			889,205			—		—			889,205		—		889,205		—		2014	N/A
1951 TW Alexander Drive Land	Durham, NC		—			4,027,176			—		142,782			4,169,958		—		4,169,958		—		2014	N/A
Flying Cloud Drive Land	Eden Pairie, MN		—			2,051,631			—		26,366			2,077,997		—		2,077,997		—		2007	N/A
Camelback 303 Business Center Land	Goodyear, AZ		—			16,857,556			—		3,219,563			20,077,119		—		20,077,119		—		2007	N/A
Pleasant Ridge Road Land	Greensboro, NC		—			564,535			—		2,841,863			3,406,398		—		3,406,398		—		2006	N/A
Caliber Ridge Ind. Park Land	Greer, SC		—			16,338			—		43,596			59,934		—		59,934		—		2007	N/A
Lakefront Plaza II Land	Hampton, VA		—			138,101			—		102,764			240,865		—		240,865		—		2001	N/A
Ridge Road & Hanover Road Land	Hanover, MD		—			3,875,203			—		211,720			4,086,923		—		4,086,923		—		2012	N/A
Ridge Road Land	Hanover, MD		—			3,371,183			—		443,379			3,814,562		—		3,814,562		—		2008	N/A
Piedmond Centre Land	High Point, NC		—			913,276			—		896,066			1,809,342		—		1,809,342		—		2006	N/A
Commonwealth Corporate Center Land	Horsham, PA		—			3,043,938			—		24,659			3,068,597		—		3,068,597		—		2005	N/A
Interwood Land	Houston, TX		—			5,160,668			—		14,362			5,175,030		—		5,175,030		—		2012	N/A
Rankin Road Land	Houston, TX		—			5,756,865			—		1,417,911			7,174,776		—		7,174,776		—		2007	N/A
Richey Road Land	Houston, TX		—			26,135,466			—		707,105			26,842,571		—		26,842,571		—		2014	N/A
Taub Beltway 8 Land	Houston, TX		—			4,611,474			—		628,497			5,239,971		—		5,239,971		—		2012	N/A
Frye Road and Valley View Lane Land	Irving, TX		—			5,901,634			—		24,398			5,926,032		—		5,926,032		—		2014	N/A
Rouse Kent Limited	Kent, UK		—			—			—		—			11,079,465		—		11,079,465		—		2012	N/A
Commodore Business Park	Logan, NJ		—			792,118			—		1,126,107			1,918,225		—		1,918,225		—		1995	N/A
Spring Creek Land	Lower Macungie Twp, PA		—			25,615,668			—		17,189,074			42,804,742		—		42,804,742		—		2013	N/A
380 Old Morehall Road	Malvern, PA		—			1,344,809			—		—			1,344,809		—		1,344,809		—		2012	N/A
Quarry Ridge Land	Malvern, PA		—			675,499			—		141,517			817,016		—		817,016		—		2001	N/A
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
AS OF DECEMBER 31, 2014
						Initial Cost								Gross Amount Carried at End of Period
Project	Location		Encumbrances			Land			Building		Costs Capitalized Subsequent to Acquisition (1)			Land and Improvements		Building and Improvements		Total 12/31/2014		Accumulated Depreciation 12/31/2014		Date of Construction or Acquisition	Depreciable life (years)
LAND HELD FOR DEVELOPMENT
Miami International Tradeport Land	Medley, FL		—			16,739,632			—		2,947,142			19,686,774		—		19,686,774		—		2011	N/A
Monarch Towne Center Land	Mirarar, FL		—			6,085,337			—		405,663			6,491,000		—		6,491,000		—		2006	N/A
557 Nazareth Pike Land	Nazareth, PA		—			4,667,646			—		343,645			5,011,291		—		5,011,291		—		2013	N/A
South 27th Street Land	Oak Creek, WI		—			427,838			—		—			427,838		—		427,838		—		2006	N/A
Beachline Industrial Park Land	Orlando, FL		—			267,468			—		95,810			363,278		—		363,278		—		2004	N/A
Southern Boulevard Land	Palm Beach County, FL		—			12,042,368			—		200,186			12,242,554		—		12,242,554		—		2014	N/A
Buckeye Logistics Center West Land	Phoenix, AZ		—			11,203,594			—		65,658			11,269,252		—		11,269,252		—		2013	N/A
Cotton Center Land	Phoenix, AZ		—			8,237,744			—		702			8,238,446		—		8,238,446		—		2007	N/A
Woodlands Center Land	Sandston, VA		—			148,314			—		21,283			169,597		—		169,597		—		1996	N/A
Northsight Land	Scottsdale, AZ		—			6,176,464			—		2,160,589			8,337,053		—		8,337,053		—		2005	N/A
Suffolk Land	Suffolk, VA		—			2,715,714			—		793,572			3,509,286		—		3,509,286		—		2006	N/A
6119 W. Linebaugh Avenue	Tampa, FL		—			180,136			—		29,890			210,026		—		210,026		—		2000	N/A
Legacy Park Land	Tampa, FL		—			3,289,423			—		4,908,708			8,198,131		—		8,198,131		—		2006	N/A
Renaissance Park Land	Tampa, FL		—			1,995,375			—		214,724			2,210,099		—		2,210,099		—		2007	N/A
Subtotal Land Held for Development			$	—		$	214,184,322		$	—	$	43,794,292		$	269,058,078	$	—	$	269,058,078	$	—
Total All Properties			$60,746,274			$1,413,189,571			$2,838,135,653		$2,817,731,432			$1,458,817,640		$5,621,318,481		$7,080,136,121		$1,182,568,534
* Denotes property is collateralized under mortgages with Allianz, John Hancock, LaSalle Bank, Athene, New York Life and Wells Fargo totaling $424.2 million
SCHEDULE III
LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP
REAL ESTATE AND ACCUMULATED DEPRECIATION
(In thousands)
A summary of activity for real estate and accumulated depreciation is as follows:
		Year Ended December 31,
		2014			2013			2012
REAL ESTATE:
Balance at beginning of year		$	6,709,841		$	5,375,440		$	4,873,875
Additions		602,586			1,888,229			505,602
Disposition of property		(232,289		)	(553,828		)	(4,037		)
Balance at end of year		$	7,080,138		$	6,709,841		$	5,375,440
ACCUMULATED DEPRECIATION:
Balance at beginning of year		$	1,051,593		$	1,067,272		$	953,573
Depreciation expense		179,143			162,546			140,570
Disposition of property		(48,167		)	(178,225		)	(26,871		)
Balance at end of year		$	1,182,569		$	1,051,593		$	1,067,272

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policy)	12 Months Ended
	Dec. 31, 2014
Organization and Basis of Presentation [Abstract]
Organization	ORGANIZATION
	Liberty Property Trust (the “Trust”) is a self-administered and self-managed Maryland real estate investment trust (a “REIT”). Substantially all of the Trust’s assets are owned directly or indirectly, and substantially all of the Trust’s operations are conducted directly or indirectly, by its subsidiary, Liberty Property Limited Partnership, a Pennsylvania limited partnership (the “Operating Partnership” and, together with the Trust and their consolidated subsidiaries, the “Company”). The Trust is the sole general partner and also a limited partner of the Operating Partnership, owning 97.7% of the common equity of the Operating Partnership at December 31, 2014. The Company owns and operates industrial properties nationally and owns and operates office properties in a focused group of office markets. Additionally, the Company owns certain assets in the United Kingdom. Unless otherwise indicated, the notes to the Consolidated Financial Statements apply to both the Trust and the Operating Partnership. The terms the "Company,” “we,” “our” and “us” means the Trust and Operating Partnership collectively.
	All square footage amounts are unaudited.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Line Items]
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share of the REIT
	Basic earnings per share is calculated by dividing the income available to common shareholders for the period by the weighted average number of common shares outstanding during the period using the two class method. Diluted earnings per share is calculated by dividing the net income available to common shareholders for the period by the weighted average number of common and dilutive securities outstanding during the period.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("US GAAP") requires management to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Principles of Consolidation, Policy [Policy Text Block]	Principles of Consolidation
	The consolidated financial statements of the Company include the Trust, the Operating Partnership, wholly owned subsidiaries and those subsidiaries in which the Company owns a majority voting interest with the ability to control operations of the subsidiaries and where no approval, veto or other important rights have been granted to the noncontrolling shareholders. All significant intercompany transactions and accounts have been eliminated.
Reclassifications, Policy [Policy Text Block]	Reclassifications
	Certain amounts from prior years have been reclassified to conform to current-year presentation including reclassifying the accompanying consolidated balance sheets for assets held for sale and the consolidated statements of comprehensive income for discontinued operations.
Real Estate and Depreciation, Policy [Policy Text Block]	Real Estate and Depreciation
	The properties are recorded at cost and are depreciated using the straight line method over their estimated useful lives. The estimated useful lives are as follows:
	Building and improvements		40 years (blended)
	Capital improvements		15 - 20 years
	Equipment		5 - 10 years
	Tenant improvements		Term of the related lease
	Expenditures directly related to the acquisition or the improvement of real estate, including interest and other costs capitalized during development, are included in net real estate and are stated at cost. The capitalized costs include pre-construction costs essential to the development of the property, development and construction costs, interest costs, real estate taxes, development-related salaries and other costs incurred during the period of development. Construction related payables at December 31, 2014 and 2013 was $41.5 million and $55.6 million.
	The Company allocates the purchase price of real estate acquired to land, building and improvements and intangibles based on the fair value of each component. Lease values for acquired properties are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management's estimate of fair market lease rates for each corresponding in-place lease ("Market Value Intangible"). Origination values are also assigned to in-place leases, and, where appropriate, value is assigned to customer relationships ("Origination Value Intangible").
	Acquisition-related costs for properties with in-place leases are expensed as incurred. Expenditures for maintenance and repairs are charged to operations as incurred.
	The Company depreciates the amounts allocated to building and improvements over 40 years and the amounts allocated to intangibles relating to in-place leases, which are included in deferred financing and leasing costs and other liabilities in the accompanying consolidated balance sheets, over the remaining term of the related leases. Market Value Intangible amortization is recorded as rental revenue. Origination Value Intangible amortization is recorded as depreciation and amortization. This calculation includes both the remaining noncancelable period and any bargain renewal option periods.
	Once a property is designated as held for sale, no further depreciation expense is recorded.
	The Company evaluates its real estate investments upon occurrence of a significant adverse change in its operations to assess whether any impairment indicators are present that affect the recovery of the recorded value. If indicators of impairment are identified, the Company estimates the future undiscounted cash flows from the use and eventual disposition of the property and compares this amount to the carrying value of the property. If any real estate investment is considered impaired, a loss is recognized to reduce the carrying value of the property to its estimated fair value.
Investments in Unconsolidated Joint Ventures, Policy [Policy Text Block]	Investments in Unconsolidated Joint Ventures
	The Company accounts for its investments in unconsolidated joint ventures using the equity method of accounting as the Company exercises significant influence, but does not control these entities. Under the equity method of accounting, the net equity investment of the Company is reflected in the accompanying consolidated balance sheets and the Company's share of net income from the joint ventures is included in the accompanying consolidated statements of comprehensive income.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company's investments in unconsolidated joint ventures may be other-than-temporarily-impaired. An investment is impaired only if management's estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other-than-temporary. To the extent impairment has occurred, the loss is measured as the excess of the carrying amount of the investment over the estimated fair value of the investment. The estimated fair value of the investments is determined using a discounted cash flow model which is a Level 3 valuation under ASC 820, "Fair Value Measurement." The Company considers a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, operating costs, capitalization rates, holding periods and discount rates.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents
	Highly liquid investments with a maturity of three months or less when purchased are classified as cash equivalents.
Restricted Cash, Policy [Policy Text Block]	Restricted Cash
	Restricted cash includes tenant security deposits and escrow funds that the Company maintains pursuant to certain mortgage loans. Restricted cash also includes the undistributed proceeds from the sale of residential land in Kent County, United Kingdom.
Accounts Receivable Deferred Rent Receivable, Policy	Accounts Receivable/Deferred Rent Receivable
	The Company's accounts receivable are comprised of rents and charges for property operating costs due from tenants. The Company's deferred rent receivable represents the cumulative difference between rent revenue recognized on a straight line basis and contractual payments due under the terms of tenant leases. The Company periodically performs a detailed review of amounts due from tenants to determine if accounts receivable and deferred rent receivable balances are collectible. Based on this review, accounts receivable and deferred rent receivable are reduced by an allowance for doubtful accounts. The Company considers tenant credit quality and payment history and general economic conditions in determining the allowance for doubtful accounts. If the accounts receivable balance or the deferred rent receivable balance is subsequently deemed uncollectible, the receivable and allowance for doubtful account balance are written off.
Revenues, Policy [Policy Text Block]	Revenues
	The Company earns rental income under operating leases with tenants. Rental income is recognized on a straight line basis over the applicable non-cancelable lease term. Operating expense reimbursements consisting of amounts due from tenants for real estate taxes, utilities and other recoverable costs are recognized as revenue in the period in which the corresponding expenses are incurred.
	The Company considers any renewal options in determining the lease term. To the extent a lease includes a tenant option to renew or extend the duration of the lease at a fixed or determinable rental rate, the Company evaluates whether or not that option represents a bargain renewal option by analyzing if there is reasonable assurance at lease inception that the tenant will exercise the option because the rental rate is sufficiently lower than the expected rental rate for equivalent property under similar terms and conditions at the exercise date.
	Termination fees (included in rental revenue) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date. The Company recognizes termination fees during the period that landlord services are rendered in accordance with Securities and Exchange Commission Staff Accounting Bulletin 104, "Revenue Recognition," after the following conditions are met:
	a.	the termination agreement is executed,
	b.	the termination fee is determinable, and
	c.	collectability of the termination fee is assured.
Deferred Financing and Leasing Costs, Policy [Policy Text Block]	Deferred Financing and Leasing Costs
	Costs incurred in connection with financing or leasing are capitalized and amortized on a straight line basis over the term of the related loan or lease. Deferred financing cost amortization is reported as interest expense. Certain employees of the Company are compensated for leasing services related to the Company's properties. The compensation directly related to these leasing services is capitalized and amortized as a deferred leasing cost over the term of the related lease.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments
	The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies. However, considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the following estimates are not necessarily indicative of the amounts the Company could have realized on disposition of the financial instruments at December 31, 2014 and December 31, 2013. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.
	The carrying value of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued interest, dividend and distributions payable and other liabilities are reasonable estimates of fair value because of the short-term nature of these instruments. The carrying value of the outstanding amounts under the Company's credit facility is also a reasonable estimate of fair value because interest rates float at a rate based on LIBOR.
	The Company determines the fair value of its interest rate swaps by using the standard methodology of netting discounted future fixed cash payments with the discounted expected variable cash receipts. These variable cash receipts of interest rate swaps are based on expectations of future LIBOR interest rates (forward curves) estimated by observing market LIBOR interest rate curves. This is a Level 2 fair value calculation. Also, credit valuation adjustments are factored into the fair value calculations to account for potential nonperformance risk. These credit valuation adjustments were concluded to be not significant inputs for the fair value calculations for the periods presented. See Note 21 - Derivative Instruments.
	The Company used a discounted cash flow model to determine the estimated fair value of its debt as of December 31, 2014 and December 31, 2013. This is a Level 3 fair value calculation. The inputs used in preparing the discounted cash flow model include actual maturity dates and scheduled cash flows as well as estimates for market value discount rates. The Company updates the discounted cash flow model on a quarterly basis to reflect any changes in the Company's debt holdings and changes to discount rate assumptions.
Income Tax, Policy [Policy Text Block]	Income Taxes
	The Company has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the "Code"). As a result, the Company generally is not subject to federal income taxation at the corporate level to the extent it distributes annually at least 100% of its REIT taxable income, as defined in the Code, to its shareholders and satisfies certain other organizational and operational requirements. The Company has met these requirements and, accordingly, no provision has been made for federal income taxes in the accompanying consolidated financial statements. If the Company fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate rates (including any alternative minimum tax) and may not be able to qualify as a REIT for the four subsequent taxable years. Even as a REIT, the Company may be subject to certain state and local income and property taxes, and to federal income and excise taxes on undistributed taxable income.
	Several of the Company's subsidiaries are taxable REIT subsidiaries (each a "TRS") and are subject to federal income taxes. In general, a TRS may perform additional services for tenants and generally may engage in real estate or non-real estate businesses that are not permitted REIT activities. The Company is also taxed in certain states, the United Kingdom, and Luxembourg. Accordingly, the Company has recognized federal, state and foreign income taxes in accordance with US GAAP, as applicable.
	There are no uncertain tax positions or possibly significant unrecognized tax benefits that are reasonably expected to occur within the next 12 months. The Company's policy is to recognize interest accrued related to unrecognized benefits in interest expense and penalties in other expense. There were no interest or penalties deducted in any of the years ended December 31, 2014, 2013 and 2012 and no interest and penalties accrued at December 31, 2014 or December 31, 2013.
	Certain of the Company's taxable REIT subsidiaries had net operating loss carryforwards available of approximately $28.7 million as of December 31, 2014. These carryforwards begin to expire in 2018. The Company has considered future taxable income and has determined that a valuation allowance for the full carrying value of net operating loss carryforwards is appropriate.
	The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, certain state and local jurisdictions, the United Kingdom and Luxembourg. With few exceptions, the Company is no longer subject to U.S. federal, state, and local, or United Kingdom and Luxembourg examinations by tax authorities for years before 2008.
	The Federal tax cost basis of the wholly owned real estate was $7.5 billion and $7.4 billion at December 31, 2014 and 2013, respectively.
Share-based Compensation, Policy [Policy Text Block]	Share-Based Compensation
	Share-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as expense over the employees' requisite service period.
Derivatives, Policy [Policy Text Block]	Derivative Financial Instruments
	We borrow funds at a combination of fixed and variable rates. Borrowings under our revolving credit facility and certain bank mortgage loans bear interest at variable rates. Our long-term debt typically bears interest at fixed rates. Our interest rate risk management objectives are to limit generally the impact of interest rate changes on earnings and cash flows and to lower our overall borrowing costs. To achieve these objectives, from time to time, we enter into interest rate hedge contracts such as collars, swaps, caps and treasury lock agreements in order to mitigate our interest rate risk with respect to various debt instruments. We generally do not hold or issue these derivative contracts for trading or speculative purposes. The interest rate on all of our variable rate debt is generally adjusted at one or three month intervals, subject to settlements under interest rate hedge contracts.
	Interest rate swaps involve the receipt of variable-rate amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) (for the Trust) and general partner's equity and limited partners' equity - common units (for the Operating Partnership) and is subsequently reclassified into interest expense in the period that the hedged forecasted transaction affects earnings.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency
	The functional currency of the Company's United Kingdom operations is pounds sterling. The Company translates the financial statements for the United Kingdom operations into US dollars. For the Trust, gains and losses resulting from this translation are included in accumulated other comprehensive (loss) income as a separate component of shareholders' equity and a proportionate amount of gain or loss is allocated to noncontrolling interest - operating partnership - common units. For the Operating Partnership, gains and losses resulting from this translation are included in general partner's equity and limited partners' equity - common units. Upon sale or upon complete or substantially complete liquidation of the Company's foreign investment, the gain or loss on the sale will include the cumulative translation adjustments that have been previously recorded in accumulated other comprehensive (loss) income and noncontrolling interest - operating partnership - common units (for the Trust) and in general partner's equity and limited partners' equity - common units (for the Operating Partnership).
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Income
	Comprehensive income, as reflected on the consolidated statements of comprehensive income, is defined as all changes in equity during each period except for those resulting from investments by or distributions to shareholders. Accumulated other comprehensive (loss) income, as reflected on the Company's consolidated balance sheets and consolidated statements of equity, reflects the effective portion of the cumulative changes in the fair value of derivatives in qualifying cash flow hedge relationships as well as gains and losses resulting from foreign currency translation.
Real Estate Held for Development and Sale, Policy [Policy Text Block]	Sales of Real Estate
	The Company accounts for the sale of real estate assets and any related gain recognition in accordance with the accounting guidance applicable to sales of real estate, which establishes standards for recognition of profit on all real estate sales transactions, other than retail land sales. The Company recognizes the sale, and associated gain or loss from the disposition, provided that the earnings process is complete and the Company is not obligated to perform significant activities after the sale.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards
	In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (ASU) 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360), Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"), which changes the requirements for reporting discontinued operations. Under ASU 2014-08, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results when the component or group of components meets the criteria to be classified as held for sale or when the component or group of components is disposed of by sale or other than by sale. Generally, the sale of a real estate asset would not meet the discontinued operations criteria and would not be presented as such under ASU 2014-08. ASU 2014-08 also requires additional disclosures about both discontinued operations and the disposal of an individually significant component of an entity that does not qualify for discontinued operations presentation in the financial statements. The Company has adopted the provisions of ASU 2014-08 effective January 1, 2014, and has applied the provisions prospectively.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance. The standard clarifies the required factors that an entity must consider when recognizing revenue. The standard also requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. ASU 2014-09 is effective for the Company beginning January 1, 2017. The Company is evaluating the impact ASU 2014-09 will have on its financial position and results of operations.
Liberty Property Limited Partnership [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Unit of the Operating Partnership
	Basic earnings per unit is calculated by dividing the income available to common unitholders for the period by the weighted average number of common units outstanding during the period using the two class method. Diluted earnings per unit is calculated by dividing the income available to common unitholders for the period by the weighted average number of common and dilutive securities outstanding during the period.

Accounting_for_the_Impairment_1

Accounting for the Impairment or Disposal of Long-Lived Assets Accounting for the Impairment or Disposal of Long-Lived Assets (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]
Interest Expense Allocated to Discontinued Operations, Policy [Policy Text Block]	Interest expense has been allocated to discontinued operations. The allocation of interest expense to discontinued operations was based on the ratio of net assets sold and held for sale (without continuing involvement) to the sum of total net assets plus consolidated debt.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	The Company determined these impairments through a comparison of the aggregate future cash flows (including quoted offer prices, a Level 1 input according to the fair value hierarchy established in ASC 820) to be generated by the properties to the carrying value of the properties. The Company has evaluated each of the properties and land held for development and has determined that there are no additional valuation adjustments necessary at December 31, 2014.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following summarizes the fair value of the Company's mortgage loans and unsecured notes from December 31, 2013 to December 31, 2014 (in thousands):
		Mortgage Loans				Unsecured Notes
		Carrying Value		Fair Value		Carrying Value		Fair Value
	As of December 31, 2013	$	545,306	$	573,944	$	2,708,213	$	2,764,831
	As of December 31, 2014	$	487,301	$	501,231	$	2,509,094	$	2,704,069

Income_per_Common_Share_of_the1

Income per Common Share of the Trust (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):
		2014					2013
		Income		Weighted	Per Share		Income		Weighted	Per Share
		(Numerator)		Average			(Numerator)		Average
				Shares					Shares
				(Denominator)					(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	170,471	147,216	$	1.16	$	91,274	130,180	$	0.7
	Dilutive shares for long-term compensation plans	—		670			—		729
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	170,471		147,886	$	1.15	91,274		130,909	$	0.7
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439		147,216	$	0.32	118,464		130,180	$	0.91
	Dilutive shares for long-term compensation plans	—		670			—		729
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439		147,886	$	0.32	118,464		130,909	$	0.9
	Basic income per common share
	Net income available to common shareholders	217,910		147,216	$	1.48	209,738		130,180	$	1.61
	Dilutive shares for long-term compensation plans	—		670			—		729
	Diluted income per common share
	Net income available to common shareholders	$	217,910	147,886	$	1.47	$	209,738	130,909	$	1.6
		2012
		Income		Weighted	Per Share
		(Numerator)		Average
				Shares
				(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	88,008	116,863	$	0.75
	Dilutive shares for long-term compensation plans	—		831
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	88,008		117,694	$	0.75
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428		116,863	$	0.43
	Dilutive shares for long-term compensation plans	—		831
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428		117,694	$	0.42
	Basic income per common share
	Net income available to common shareholders	137,436		116,863	$	1.18
	Dilutive shares for long-term compensation plans	—		831
	Diluted income per common share
	Net income available to common shareholders	$	137,436	117,694	$	1.17

Income_per_Common_Unit_of_the_1

Income per Common Unit of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Unit, Basic and Diluted [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):
		2014						2013
		Income			Weighted	Per Share		Income			Weighted	Per Share
		(Numerator)			Average			(Numerator)			Average
					Shares						Shares
					(Denominator)						(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	170,471		147,216	$	1.16	$	91,274		130,180	$	0.7
	Dilutive shares for long-term compensation plans	—			670			—			729
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	170,471			147,886	$	1.15	91,274			130,909	$	0.7
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,216	$	0.32	118,464			130,180	$	0.91
	Dilutive shares for long-term compensation plans	—			670			—			729
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	47,439			147,886	$	0.32	118,464			130,909	$	0.9
	Basic income per common share
	Net income available to common shareholders	217,910			147,216	$	1.48	209,738			130,180	$	1.61
	Dilutive shares for long-term compensation plans	—			670			—			729
	Diluted income per common share
	Net income available to common shareholders	$	217,910		147,886	$	1.47	$	209,738		130,909	$	1.6
		2012
		Income			Weighted	Per Share
		(Numerator)			Average
					Shares
					(Denominator)
	Basic income from continuing operations
	Income from continuing operations net of noncontrolling interest	$	88,008		116,863	$	0.75
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from continuing operations
	Income from continuing operations net of noncontrolling interest	88,008			117,694	$	0.75
	Basic income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			116,863	$	0.43
	Dilutive shares for long-term compensation plans	—			831
	Diluted income from discontinued operations
	Discontinued operations net of noncontrolling interest	49,428			117,694	$	0.42
	Basic income per common share
	Net income available to common shareholders	137,436			116,863	$	1.18
	Dilutive shares for long-term compensation plans	—			831
	Diluted income per common share
	Net income available to common shareholders	$	137,436		117,694	$	1.17
Liberty Property Limited Partnership [Member]
Earnings Per Unit, Basic and Diluted [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income per common unit of the Operating Partnership (in thousands, except per unit amounts):
		2014						2013
		Income			Weighted	Per Unit		Income			Weighted	Per Unit
		(Numerator)			Average Units			(Numerator)			Average Units
					(Denominator)						(Denominator)
	Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	175,035					$	97,102
	Less: Preferred unit distributions	(472		)				(2,119		)
	Excess of preferred unit redemption over carrying amount	—						(1,236		)
	Basic income from continuing operations
	Income from continuing operations available to common unitholders	174,563			150,770	$	1.16	93,747			133,858	$	0.7
	Dilutive units for long-term compensation plans	—			670			—			729
	Diluted income from continuing operations
	Income from continuing operations available to common unitholders	174,563			151,440	$	1.15	93,747			134,587	$	0.7
	Basic income from discontinued operations
	Discontinued operations	48,581			150,770	$	0.32	121,839			133,858	$	0.91
	Dilutive units for long-term compensation plans	—			670			—			729
	Diluted income from discontinued operations
	Discontinued operations	48,581			151,440	$	0.32	121,839			134,587	$	0.9
	Basic income per common unit
	Income available to common unitholders	223,144			150,770	$	1.48	215,586			133,858	$	1.61
	Dilutive units for long-term compensation plans	—			670			—			729
	Diluted income per common unit
	Income available to common unitholders	$	223,144		151,440	$	1.47	$	215,586		134,587	$	1.6
		2012
		Income			Weighted	Per Unit
		(Numerator)			Average Units
					(Denominator)
	Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	97,022
	Less: Preferred unit distributions	(9,902		)
	Excess of preferred unit carrying amount over redemption	3,689
	Basic income from continuing operations
	Income from continuing operations available to common unitholders	90,809			120,623	$	0.75
	Dilutive units for long-term compensation plans	—			831
	Diluted income from continuing operations
	Income from continuing operations available to common unitholders	90,809			121,454	$	0.75
	Basic income from discontinued operations
	Discontinued operations	51,004			120,623	$	0.43
	Dilutive units for long-term compensation plans	—			831
	Diluted income from discontinued operations
	Discontinued operations	51,004			121,454	$	0.42
	Basic income per common unit
	Income available to common unitholders	141,813			120,623	$	1.18
	Dilutive units for long-term compensation plans	—			831
	Diluted income per common unit
	Income available to common unitholders	$	141,813		121,454	$	1.17

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table sets forth the components of Accumulated Other Comprehensive (Loss) Income (in thousands):
			December 31,
			2014			2013
	Foreign Currency Translation:
	Beginning balance		$	8,592		$	3,195
	Translation adjustment		(14,415		)	5,397
	Ending balance		(5,823		)	8,592
	Derivative Instruments:
	Beginning balance		1,584			—
	Unrealized (loss) gain		(3,419		)	1,584
	Reclassification adjustment (1)		1,458			—
	Ending balance		(377		)	1,584
	Total accumulated other comprehensive (loss) income		(6,200		)	10,176
	Less: portion included in noncontrolling interest – operating partnership		(52		)	(434		)
	Total accumulated other comprehensive (loss) income included in shareholders' equity		$	(6,252	)	$	9,742
	-1	Amounts reclassified out of Accumulated Other Comprehensive (Loss) Income into contractual interest expense.

Real_Estate_Tables

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate [Abstract]
Real Estate Investment Property, Net [Table Text Block]	The carrying value of these properties by type as of December 31, 2014 and 2013 is as follows (in thousands):
		Land			Building
		And Land			And						Accumulated
		Improvements			Improvements				Total		Depreciation
	2014
	Industrial properties	$	773,874		$	3,513,534			$	4,287,408	$	620,967
	Office properties	415,886			1,830,374				2,246,260		561,602
	2014 Total	$	1,189,760		$	5,343,908			$	6,533,668	$	1,182,569
	2013
	Industrial properties	$	707,951		$	3,236,596			$	3,944,547	$	514,073
	Office properties	429,946			1,893,106				2,323,052		537,520
	2013 Total	$	1,137,897		$	5,129,702			$	6,267,599	$	1,051,593
Real Estate Properties Sold [Table Text Block]	2014 Sales
	Reportable Segment	Number of Buildings		Leaseable Square Feet (unaudited)			Gross Proceeds
							(in thousands)
	Houston	5		553,510			$	29,721
	Maryland	23		1,367,569			185,460
	Minnesota	1		191,336			41,000
	New Jersey	27		1,790,893			164,767
	Orlando	4		588,678			116,750
	Southeastern PA	3		113,833			12,225
	Other	2		134,510			8,655
	Total	65		4,740,329			$	558,578
	2013 Sales
	Reportable Segment	Number of Buildings		Leaseable Square Feet (unaudited)			Gross Proceeds
							(in thousands)
	Carolinas	1		59,200			$	2,000
	Lehigh/Central PA	1		101,750			8,650
	Minnesota	12		915,693			71,493
	Philadelphia	2		656,350			103,650
	Richmond/Hampton Roads	1		86,170			10,978
	Southeastern PA	5		996,874			102,734
	Other	36		2,307,135			192,275
	Total	58		5,123,172			$	491,780

Investments_in_Unconsolidated_1

Investments in Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Condensed Balance Sheet of Equity Method Investments [Table Text Block]	The condensed balance sheets as of December 31, 2014 and 2013 and condensed statements of operations for the years ended December 31, 2014, 2013 and 2012 for Liberty Venture I, LP, Kings Hill Unit Trust, Liberty Illinois, LP, Blythe Valley JV Sarl (no remaining interest as of December 31, 2013), Liberty Washington, LP, Liberty/Commerz, Liberty Property 18th & Arch and the other unconsolidated joint ventures are as follows (in thousands):
	Condensed Balance Sheets:
		31-Dec-14
		Liberty			Kings Hill			Liberty			Liberty			Liberty/			Liberty Property
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			18th & Arch (3)			Other			Total
	Real estate assets	$	173,346		$	173,707		$	260,988		$	603,413		$	494,678		$	—		$	69,041		$	1,775,173
	Accumulated depreciation	(32,752		)	(26,494		)	(48,191		)	(35,384		)	(97,189		)	—			(9,651		)	(249,661		)
	Real estate assets, net	140,594			147,213			212,797			568,029			397,489			—			59,390			1,525,512
	Development in progress	—			—			17,973			—			—			111,244			4,366			133,583
	Land held for development	14,108			—			28,362			2,000			—			—			39,438			83,908
	Other assets	15,523			14,928			20,182			50,657			52,393			1,306			38,215			193,204
	Total assets	$	170,225		$	162,141		$	279,314		$	620,686		$	449,882		$	112,550		$	141,409		$	1,936,207
	Debt	$	78,748		$	91,356		$	145,752		$	318,367		$	317,934		$	—		$	43,114		$	995,271
	Other liabilities	5,215			94,504			13,812			12,022			9,657			13,398			14,306			162,914
	Equity	86,262			(23,719		)	119,750			290,297			122,291			99,152			83,989			778,022
	Total liabilities and equity	$	170,225		$	162,141		$	279,314		$	620,686		$	449,882		$	112,550		$	141,409		$	1,936,207
	Company's net investment in unconsolidated joint ventures (1)	$	20,010		$	11,663		$	18,692		$	69,230		$	23,153		$	21,292		$	44,792		$	208,832
		31-Dec-13
		Liberty			Kings Hill			Liberty			Liberty			Liberty/
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			Other			Total
	Real estate assets	$	129,354		$	182,220		$	261,375		$	887,452		$	494,150		$	70,274		$	2,024,825
	Accumulated depreciation	(32,617		)	(25,006		)	(43,304		)	(131,064		)	(83,461		)	(8,456		)	(323,908		)
	Real estate assets, net	96,737			157,214			218,071			756,388			410,689			61,818			1,700,917
	Development in progress	2,226			—			—			—			—			—			2,226
	Land held for development	2,842			—			42,770			2,000			—			47,549			95,161
	Other assets	11,531			20,173			20,346			58,701			50,680			15,911			177,342
	Total assets	$	113,336		$	177,387		$	281,187		$	817,089		$	461,369		$	125,278		$	1,975,646
	Debt	$	72,121		$	97,091		$	140,400		$	319,856		$	321,401		$	43,151		$	994,020
	Other liabilities	4,032			100,112			7,936			15,012			9,544			9,846			146,482
	Equity	37,183			(19,816		)	132,851			482,221			130,424			72,281			835,144
	Total liabilities and equity	$	113,336		$	177,387		$	281,187		$	817,089		$	461,369		$	125,278		$	1,975,646
	Company's net investment in unconsolidated joint ventures (1)	$	8,551		$	12,772		$	21,688		$	72,981		$	24,740		$	38,923		$	179,655
Schedule of Condensed Statements of Operations of Equity Method Investments [Table Text Block]	Condensed Statements of Operations (2):
		Year Ended December 31, 2014
		Liberty			Kings Hill			Liberty			Liberty			Liberty/			Liberty Property			Other
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			18th & Arch (3)			-4			Total
	Total revenue	$	19,277		$	13,221		$	25,181		$	72,824		$	63,580		$	—		$	8,923		$	203,006
	Operating expense	6,398			5,387			8,965			28,349			23,557			199			2,897			75,752
		12,879			7,834			16,216			44,475			40,023			(199		)	6,026			127,254
	Interest	(5,078		)	(6,110		)	(7,932		)	(18,612		)	(20,179		)	—			(3,415		)	(61,326		)
	Depreciation and amortization	(5,757		)	(4,135		)	(7,380		)	(27,112		)	(14,591		)	—			(1,891		)	(60,866		)
	Other income/(expense)	(17		)	208			39			375			(278		)	(13		)	9,090			9,404
	Gain (loss) on sale/impairment	—			—			187			(172,691		)	—			—			—			(172,504		)
	Net income (loss)	$	2,027		$	(2,203	)	$	1,130		$	(173,565	)	$	4,975		$	(212	)	$	9,810		$	(158,038	)
	Company's equity in earnings (loss) of unconsolidated joint ventures	$	788		$	(288	)	$	824		$	2,251		$	1,633		$	(33	)	$	5,139		$	10,314
		Year Ended December 31, 2013
		Liberty			Kings Hill			Liberty			Liberty			Liberty/
		Venture I, LP			Unit Trust			Illinois, LP			Washington, LP			Commerz			Other			Total
	Total revenue	$	16,238		$	12,701		$	24,455		$	75,821		$	62,411		$	8,415		$	200,041
	Operating expense	5,248			4,187			8,353			27,549			23,074			2,636			71,047
		10,990			8,514			16,102			48,272			39,337			5,779			128,994
	Interest	(5,318		)	(5,133		)	(8,348		)	(18,946		)	(20,391		)	(2,933		)	(61,069		)
	Depreciation and amortization	(4,414		)	(3,829		)	(7,382		)	(28,392		)	(14,734		)	(1,870		)	(60,621		)
	Other income/(expense)	53			71			38			122			(233		)	(37		)	14
	Loss from discontinued operations	—			(5,647		)	—			(8,731		)	—			—			(14,378		)
	Net income (loss)	$	1,311		$	(6,024	)	$	410		$	(7,675	)	$	3,979		$	939		$	(7,060	)
	Company's equity in earnings (loss) of unconsolidated joint ventures	$	530		$	(908	)	$	618		$	3,748		$	1,406		$	673		$	6,067
		Year Ended December 31, 2012
		Liberty			Kings Hill			Liberty			Blythe Valley			Liberty			Liberty/
		Venture I, LP			Unit Trust			Illinois, LP			JV Sarl			Washington, LP			Commerz			Other			Total
	Total revenue	$	15,328		$	15,642		$	22,156		$	14,278		$	81,128		$	62,484		$	7,481		$	218,497
	Operating expense	5,277			4,237			8,093			3,921			27,901			22,935			2,392			74,756
		10,051			11,405			14,063			10,357			53,227			39,549			5,089			143,741
	Interest	(5,402		)	(6,520		)	(8,348		)	(12,130		)	(21,260		)	(20,501		)	(2,989		)	(77,150		)
	Depreciation and amortization	(3,930		)	(3,731		)	(7,395		)	(4,148		)	(28,749		)	(15,411		)	(1,885		)	(65,249		)
	Other income/(expense)	40			(160		)	31			211			149			(80		)	21			212
	Impairment	—			—			—			(77,026		)	—			—			—			(77,026		)
	Net income (loss)	$	759		$	994		$	(1,649	)	$	(82,736	)	$	3,367		$	3,557		$	236		$	(75,472	)
	Company's equity in earnings (loss) of unconsolidated joint ventures	$	306		$	352		$	106		$	(5,610	)	$	3,243		$	1,304		$	(382	)	$	(681	)
	-1	Differences between the Company's net investment in unconsolidated joint ventures and its underlying equity in the net assets of the venture are primarily a result of impairments related to the Company's investment in unconsolidated joint ventures, the deferral of gains associated with the sales of properties to joint ventures in which the Company retains an ownership interest and loans made to the joint ventures by the Company. These adjustments have resulted in an aggregate difference increasing the Company's investments in unconsolidated joint ventures by $3.2 million as of December 31, 2014 and reducing the Company's investment in unconsolidated joint ventures by $41.7 million as of December 31, 2013. Differences between historical cost basis and the basis reflected at the joint venture level (other than loans) are typically depreciated over the life of the related asset.
	(2) The year ended December 31, 2012 has not been restated for discontinued operations.
	(3) Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia.
	(4) Other income/(expense) for this group of joint ventures reflects gains related to the sales of land leasehold interests totaling $9.1 million.

Deferred_Financing_and_Leasing1

Deferred Financing and Leasing Costs (Tables)	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Deferred financing and leasing costs were comprised of the following as of December 31, 2014 and 2013 (in thousands):
		December 31,
		2014		2013
	Deferred financing costs	$	38,445	$	36,883
	Deferred leasing costs	215,714		192,194
	Intangible - market rent	18,082		19,366
	Intangible - origination value	103,512		117,905
		375,753		366,348
	Accumulated amortization:
	Deferred financing costs	20,284		17,536
	Deferred leasing costs	100,702		91,989
	Intangible - market rent	8,266		4,180
	Intangible - origination value	40,215		26,576
		169,467		140,281
	Deferred financing and leasing costs, net	$	206,286	$	226,067

Deferred_Financing_and_Leasing2

Deferred Financing and Leasing Costs Schedule of Finite-Lived Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The aggregate amortization expense for intangible - origination value for the next five years and thereafter is as follows (in thousands):
	2015	$	21,292
	2016	16,273
	2017	10,614
	2018	6,249
	2019	3,081
	Thereafter	5,788
	Total	$	63,297
Leases, Acquired-in-Place, Market Adjustment [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The aggregate amortization of intangible - market rent including the market rent - intangible liabilities is a decrease (increase) in rental revenue over the next five years and thereafter as follows (in thousands):
	2015	$	2,047
	2016	1,426
	2017	586
	2018	80
	2019	3
	Thereafter	(1,779		)
	Total	$	2,363

Indebtedness_Tables

Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	The scheduled principal amortization and maturities of the Company's mortgage loans, unsecured notes outstanding and the Credit Facility (as defined below) and the related weighted average interest rates at December 31, 2014 are as follows (in thousands, except percentages):
												Weighted
		Mortgages										Average
		Principal		Principal		Unsecured		Credit				Interest
		Amortization		Maturities		Notes		Facility		Total		Rate
	2015	$	12,194	$	—	$	315,981	$	—	$	328,175	5.04	%
	2016	11,768		182,318		299,577		—		493,663		6.08	%
	2017	10,916		2,349		296,043		—		309,308		6.56	%
	2018	8,730		27,051		99,976		167,000		302,757		3.61	%
	2019	8,825		50,043		—		—		58,868		4	%
	2020	4,280		67,361		349,524		—		421,165		4.83	%
	2021	2,716		65,008		—		—		67,724		4.06	%
	2022	2,211		—		399,419		—		401,630		4.13	%
	2023	2,319		—		299,766		—		302,085		3.39	%
	2024 and thereafter	27,266		1,946		448,808		—		478,020		4.43	%
		$	91,225	$	396,076	$	2,509,094	$	167,000	$	3,163,395	4.78	%

Leasing_Activity_Tables

Leasing Activity (Tables)	12 Months Ended
	Dec. 31, 2014
Operating Leased Assets [Line Items]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Future minimum rental payments due from tenants under noncancelable operating leases as of December 31, 2014 are as follows (in thousands):
	2015	$	540,996
	2016	486,016
	2017	400,297
	2018	330,906
	2019	258,777
	Thereafter	1,019,497
	Total	$	3,036,489

Noncontrolling_Interest_Operat1

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Tables)	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract]
Schedule of Preferred Units [Table Text Block]	As of December 31, 2014, the Company had outstanding the following cumulative preferred units of the Operating Partnership:
	ISSUE	AMOUNT		UNITS	LIQUIDATION	DIVIDEND
					PREFERENCE	RATE
		(in 000’s)
	Series I-2	$	7,537	301	$25	6.25	%

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Shareholders' Equity [Abstract]
Schedule of Taxability of Common Shares [Table Text Block]	The following unaudited table summarizes the taxability of common share distributions (taxability for 2014 is estimated):
		2014			2013		2012
	Ordinary dividend	$	1.2556		$	1.4312	$	1.5036
	Capital gain - 20%	—			0.0016		—
	IRC Sec 1250 unrecapture gain - 25%	0.3712			0.4672		0.0164
	Return of capital	0.2732			—		0.38
	Total	$	1.9		$	1.9	$	1.9
Preferred Unit Distributions [Table Text Block]	The Company paid the following Equity Preferred Unit distributions for the years ended December 31:
		2013		2012
	Distributions (in millions)	$1.60		$9.90
	Distribution per unit:
	Series B	—		$0.45
	Series E	$1.21		$3.50
	Series F	$1.32		$1.43
	Series G	$1.33		$3.35
	Series H	—		$0.77

Owners_Equity_Operating_Partne1

Owners' Equity - Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2014
Class of Stock [Line Items]
Preferred Unit Distributions [Table Text Block]	The Company paid the following Equity Preferred Unit distributions for the years ended December 31:
		2013	2012
	Distributions (in millions)	$1.60	$9.90
	Distribution per unit:
	Series B	—	$0.45
	Series E	$1.21	$3.50
	Series F	$1.32	$1.43
	Series G	$1.33	$3.35
	Series H	—	$0.77
Liberty Property Limited Partnership [Member]
Class of Stock [Line Items]
Preferred Unit Distributions [Table Text Block]	The Operating Partnership paid the following Equity Preferred Unit distributions for the years ended December 31:
		2013	2012
	Distributions (in millions)	$1.60	$9.90
	Distribution per unit:
	Series B	—	$0.45
	Series E	$1.21	$3.50
	Series F	$1.32	$1.43
	Series G	$1.33	$3.35
	Series H	—	$0.77

Share_Based_Compensation_Table

Share Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	1.60%		1.10%	1.10%
	Dividend yield	5.20%		5.40%	5.70%
	Historical volatility factor	0.236		0.356	0.377
	Weighted-average expected life	6 years		6 years	5 years
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A summary of the Company's share option activity and related information for the year ended December 31, 2014 follows:
			Options (000s)		Weighted Average Exercise Price
	Outstanding January 1, 2014		2,355		$	36.9
	Granted		439		37.32
	Exercised		(44	)	30.66
	Forfeited		(258	)	42.69
	Outstanding December 31, 2014		2,492		$	36.48
	Exercisable at December 31, 2014		1,750		$	36.16
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]	The key assumptions used in the Monte Carlo simulation are as follows:
		Year Ended December 31,
		2014		2013	2012
	Risk-free interest rate	0.68%		0.35%	0.52%
	Volatility	24%		26%	41%
Schedule of Nonvested Share Activity [Table Text Block]	The Company's restricted LTI share activity for the year ended December 31, 2014 is as follows:
			Shares (000s)		Weighted Avg. Grant Date Fair value
	Nonvested at January 1, 2014		786		$	35.37
	Granted		263		37.13
	Vested		(282	)	32.93
	Forfeited		(14	)	36.19
	Nonvested at December 31, 2014		753		$	36.89

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Rental Payments	Future minimum rental payments under the terms of all non-cancelable operating ground leases under which the Company is the lessee, as of December 31, 2014, were as follows (in thousands):
	Year	Amount
	2015	$	668
	2016	687
	2017	687
	2018	687
	2019	687
	2020 though 2034	6,608
	Total	$	10,024

Quarterly_Results_of_Operation1

Quarterly Results of Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	A summary of quarterly results of operations for the years ended December 31, 2014 and 2013 follows. Certain amounts have been reclassified to conform to the current presentation of discontinued operations (in thousands, except per share amounts).
			QUARTER ENDED
			DEC. 31,			SEPT. 30,		JUNE 30,		MAR. 31,		DEC. 31,		SEPT. 30,		JUNE 30,		MAR. 31,
			2014			2014		2014		2014		2013		2013		2013		2013
	Operating revenue		$	203,685		$	198,356	$	192,960	$	197,630	$	192,427	$	155,349	$	151,026	$	147,128
	Income from continuing operations		84,193		-2	35,318		29,811		26,260		19,911		23,406		29,611		24,827
	Discontinued operations		306			133		296		47,846		51,832		6,544		13,633		49,830
	Net income		84,499			35,451		30,107		74,106		71,743		29,950		43,244		74,657
	Income per common share - basic (1)		0.56			0.23		0.2		0.49		0.48		0.21		0.33		0.6
	Income per common share - diluted (1)		0.55			0.23		0.2		0.49		0.48		0.21		0.33		0.6
	-1	The sum of quarterly financial data may vary from the annual data due to rounding.
	-2	Includes gain on sale of $43.2 million.

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The operating information by reportable segment is as follows (in thousands):
				Year ended
				December 31,
				2014				2013				2012
	Operating revenue
		Carolinas		$	35,870			$	30,243			$	28,667
		Chicago/Milwaukee		33,068				18,083				9,780
		Houston		49,309				37,773				30,172
		Lehigh/Central PA		118,145				101,101				96,804
		Minnesota		54,892				62,415				57,331
		Orlando		32,674				31,400				30,844
		Philadelphia		35,238				31,690				28,153
		Richmond/Hampton Roads		40,911				40,247				41,395
		South Florida		48,804				38,464				35,628
		Southeastern PA		148,714				165,248				169,645
		Tampa		53,725				52,230				46,627
		United Kingdom		16,360				7,669				4,690
		Other		130,013				142,402				117,562
	Segment-level operating revenue			797,723				758,965				697,298
	Reconciliation to total operating revenues
		Discontinued operations		(4,728		)		(113,586		)		(137,476		)
		Other		(364		)		551				457
	Total operating revenue			$	792,631			$	645,930			$	560,279
	Net operating income
		Carolinas		$	24,578			$	20,434			$	18,733
		Chicago/Milwaukee		20,856				11,726				5,329
		Houston		29,134				22,632				17,862
		Lehigh/Central PA		82,050				68,504				65,566
		Minnesota		26,464				30,016				26,348
		Orlando		21,472				20,506				20,153
		Philadelphia		26,722				23,587				20,527
		Richmond/Hampton Roads		24,357				24,063				24,762
		South Florida		27,947				20,943				18,921
		Southeastern PA		81,183				91,193				98,729
		Tampa		33,776				33,042				28,350
		United Kingdom		10,704				2,597				(257		)
		Other		83,991				81,435				64,207
	Segment-level net operating income			493,234				450,678				409,230
	Reconciliation to income from continuing operations
		Interest expense (1)		(152,444		)		(143,018		)		(123,146		)
		Depreciation/amortization expense (1) (2)		(177,715		)		(138,128		)		(104,643		)
		Gain on property dispositions		45,030				—				—
		Equity in earnings (loss) of unconsolidated joint ventures		10,314				6,067				(681		)
		General and administrative expense (1) (2)		(38,041		)		(50,998		)		(40,831		)
		Discontinued operations excluding gain on property dispositions		(1,950		)		(26,455		)		(38,578		)
		Income taxes (2)		(2,781		)		(2,748		)		(874		)
		Other		(65		)		2,357				(3,730		)
	Income from continuing operations			$	175,582			$	97,755			$	96,747
	(1) Includes activity on discontinued operations.
	(2) Excludes costs which are included in determining segment-level net operating income.
Schedule of Segment Reporting Information, by Segment, Depreciation and Amortization [Table Text Block]	The amount of depreciation and amortization expense related to tenant improvement and lease transaction costs within each reporting segment for the Net operating income calculation is as follows:
			Year ended
			December 31,
			2014				2013				2012
	Carolinas		$	2,329			$	1,935			$	1,726
	Chicago/Milwaukee		466				251				233
	Houston		3,988				3,200				2,608
	Lehigh/Central PA		10,157				9,781				9,753
	Minnesota		4,478				5,797				5,132
	Orlando		3,116				3,037				2,804
	Philadelphia		1,803				1,729				1,724
	Richmond/Hampton Roads		4,278				4,156				4,157
	South Florida		2,824				2,979				3,083
	Southeastern PA		12,272				15,040				14,109
	Tampa		3,384				3,033				2,959
	United Kingdom		177				172				269
	Other		5,631				13,439				13,061
	Depreciation and amortization of tenant improvement and lease transaction costs		$	54,903			$	64,549			$	61,618
Revenue from External Customers by Products and Services [Table Text Block]	The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2014, 2013 and 2012 is as follows (in thousands):
		Year Ended
		December 31, 2014												December 31, 2013							December 31, 2012
		Industrial				Office				Total				Industrial		Office		Total			Industrial		Office		Total
	Carolinas	$	35,870			$	—			$	35,870			$	30,243	$	—	$	30,243		$	26,818	$	1,849	$	28,667
	Chicago/Milwaukee	33,068				—				33,068				18,083		—		18,083			6,908		2,872		9,780
	Houston	49,309				—				49,309				37,773		—		37,773			30,172		—		30,172
	Lehigh/Central PA	115,821				2,324				118,145				98,715		2,386		101,101			94,440		2,364		96,804
	Minnesota	25,378				29,514				54,892				32,043		30,372		62,415			27,810		29,521		57,331
	Orlando	18,635				14,039				32,674				16,535		14,865		31,400			15,840		15,004		30,844
	Philadelphia	10,072				25,166				35,238				9,534		22,156		31,690			8,356		19,797		28,153
	Richmond/Hampton Roads	20,924				19,987				40,911				19,073		21,174		40,247			18,490		22,905		41,395
	South Florida	18,603				30,201				48,804				7,955		30,509		38,464			5,213		30,415		35,628
	Southeastern PA	28,895				119,819				148,714				27,076		138,172		165,248			28,604		141,041		169,645
	Tampa	25,451				28,274				53,725				24,331		27,899		52,230			17,584		29,043		46,627
	United Kingdom	13,090				3,270				16,360				4,205		3,464		7,669			1,307		3,383		4,690
	Other (1)	82,672				47,341				130,013				43,355		99,047		142,402			28,268		89,294		117,562
		$	477,788			$	319,935			797,723				$	368,921	$	390,044	758,965			$	309,810	$	387,488	697,298
	Reconciliation to total operating revenue
	Discontinued operations									(4,728		)						(113,586		)					(137,476		)
	Corporate Other									(364		)						551							457
	Total operating revenue									$	792,631							$	645,930						$	560,279
	-1	A substantial portion of the buildings contributing to office operating revenue in 2012 and 2013 were sold in conjunction with the Portfolio Sale. See Footnote 19.
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	The Company's total assets by reportable segment as of December 31, 2014 and 2013 is as follows (in thousands):
			As of December 31,
			2014				2013
	Total assets
		Carolinas	$	325,690			$	257,230
		Chicago/Milwaukee	422,531				413,585
		Houston	418,154				380,248
		Lehigh/Central PA	1,023,641				938,824
		Minnesota	333,506				335,613
		Orlando	160,899				253,888
		Philadelphia	366,577				316,810
		Richmond/Hampton Roads	250,205				250,008
		South Florida	400,034				380,138
		Southeastern PA	698,163				695,966
		Tampa	335,652				337,301
		United Kingdom	231,276				247,537
		Other	1,553,250				1,735,392
	Segment-level total assets		6,519,578				6,542,540
		Corporate Other	105,958				233,020
	Total assets		$	6,625,536			$	6,775,560
Schedule of Long-Lived Assets, by Geographical Areas [Table Text Block]	The Company's real estate assets by reportable segment as of December 31, 2014 and 2013 is as follows (in thousands):
			As of December 31,
			2014				2013
	Real estate assets
		Carolinas	$	309,822			$	245,938
		Chicago/Milwaukee	383,494				371,149
		Houston	398,080				360,779
		Lehigh/Central PA	958,886				877,969
		Minnesota	307,970				308,272
		Orlando	139,218				228,182
		Philadelphia	255,313				229,769
		Richmond/Hampton Roads	238,670				238,129
		South Florida	378,398				358,492
		Southeastern PA	636,280				630,460
		Tampa	317,106				320,495
		United Kingdom	182,588				187,699
		Other	1,391,744				1,300,915
	Total real estate assets		$	5,897,569			$	5,658,248
Schedule of Expenditures on Long-Lived Assets [Table Text Block]	The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2014, 2013 and 2012 (in thousands):
			Year Ended December 31,
			2014				2013				2012
	Costs incurred on long-lived assets
		Carolinas	$	72,252			$	15,582			$	26,860
		Chicago/Milwaukee	21,698				248,640				49,941
		Houston	70,903				116,024				46,003
		Lehigh/Central PA	105,725				161,925				86,245
		Minnesota	28,966				38,434				41,821
		Orlando	7,827				10,953				10,122
		Philadelphia	32,012				17,941				93,673
		Richmond/Hampton Roads	10,348				15,880				8,612
		South Florida	30,063				148,165				3,337
		Southeastern PA	39,638				39,590				11,577
		Tampa	7,262				28,655				74,304
		United Kingdom	16,298				155,829				6,110
		Other	172,495				897,831				53,412
	Total costs incurred on long-lived assets		$	615,487			$	1,895,449			$	512,017

Accounting_for_the_Impairment_2

Accounting for the Impairment or Disposal of Long-Lived Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	A summary of the results of operations for the properties classified as discontinued operations through the respective disposition dates is as follows (in thousands):
		For the Year Ended December 31,
		2014			2013			2012
	Revenues	$	4,728		$	113,586		$	137,476
	Operating expenses	(2,258		)	(41,875		)	(48,956		)
	Interest and other income	37			213			580
	Interest expense	(557		)	(15,903		)	(19,783		)
	Depreciation and amortization	—			(29,566		)	(30,739		)
	Income before gain on property dispositions	1,950			26,455			38,578
	Gain on property dispositions	46,631			95,384			12,426
	Net income	$	48,581		$	121,839		$	51,004
Asset Impairment Charges [Table Text Block]	The impairment losses are for operating properties or land parcels and were in the reportable segments and for the amounts as indicated below (amounts in thousands):
			Year Ended December 31,
	Reportable Segment		2014			2013			2012
	Carolinas		$	—		$	—		$	36
	Chicago/Milwaukee		—			—			514
	Richmond/Hampton Roads		—			—			27
	South Florida		—			—			(51		)	(1)
	Southeastern PA		106						1,699
	Tampa		—			248			—
	United Kingdom		—			784			4,597
	Other		11			872			29
	Total		$	117		$	1,904		$	6,851
	-1	Represents recovery of estimated sales costs on properties sold.

Business_Combination_Business_

Business Combination Business Combination (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Estimated fair values of assets acquired and liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date.
	Assets
	Real estate:
	Land and land improvements	$	247,393
	Building and improvements	1,152,717
	Operating real estate	1,400,110
	Intangible - in-place leases/market rent	97,396
	Other assets	4,953
	Total assets	1,502,459
	Liabilities
	Mortgage loans	243,230
	Other liabilities	32,958
	Intangible - market rent	5,737
	Total liabilities	281,925
	Net assets acquired	$	1,220,534
Unaudited pro forma	The following unaudited pro forma condensed income statement information has been prepared as if the Cabot Acquisition, the Trust’s August 2013 common share offering and the Operating Partnership’s September 2013 senior note offering had been completed on January 1, 2012. The pro forma condensed consolidated financial information does not purport to represent what the Company’s results of operations would have been assuming the completion of the Cabot Acquisition and the related financing activities had occurred on January 1, 2012 nor do they purport to project the results of operations of the Company for any future period (in thousands):
			For the Year Ended
			December 31,
			2013		2012
	Total operating revenue		$	750,896	$	692,583
	Net income available to common shareholders		$	211,601	$	134,295

Supplemental_Disclosure_to_Sta1

Supplemental Disclosure to Statements of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Disclosure to Statements of Cash Flows [Abstract]
Supplemental Disclosure to Statements of Cash Flows	The following are supplemental disclosures to the statements of cash flows for the years ended December 31, 2014, 2013 and 2012 (amounts in thousands):
		2014			2013		2012
	Write-off of fully depreciated/amortized property and deferred costs	$	38,131		$	22,269	$	31,069
	Write-off of depreciated property and deferred costs due to sale	173,083			202,695		106,698
	Write-off of preferred units costs due to redemption	—			1,214		2,806
	Assumption of mortgage loans in connection with the acquisition of properties	—			229,751		12,537
	Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity	(11,948		)	—		—
	Changes in accrued development capital expenditures	6,264			17,053		2,297
	Unrealized (loss) gain on cash flow hedge	(3,419		)	1,584		—

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation (Narrative) (Details)	Dec. 31, 2014
Organization and Basis of Presentation [Abstract]
Ownership interest in operating partnership - Limited Partnership	97.70%

Investments_in_Unconsolidated_2

Investments in Unconsolidated Joint Ventures Valuation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments in joint ventures	$0	$0
United Kingdom [Member]
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments in joint ventures			$0.70

Real_Estate_and_Depreciation_D

Real Estate and Depreciation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Construction related payables	41.5	$55.60
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful Life	40 years
Minimum [Member] | Capital improvements
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Minimum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Maximum [Member] | Capital improvements
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Maximum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Useful Life	10 years

Accounts_ReceivableDeferred_Re

Accounts Receivable/Deferred Rent Receivable (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable and Deferred Rent Receivable [Abstract]
Allowance for Doubtful Accounts Receivable	$7.40	$7.80
Provision for Doubtful Accounts	$1.70	$1.80	$0.50

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments (Details) (Fair Value, Inputs, Level 3 [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Portion at Other than Fair Value Measurement [Member] | Unsecured Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt, Fair Value	$2,509,094	$2,708,213
Portion at Other than Fair Value Measurement [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt, Fair Value	487,301	545,306
Estimate of Fair Value Measurement [Member] | Unsecured Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt, Fair Value	2,704,069	2,764,831
Estimate of Fair Value Measurement [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt, Fair Value	$501,231	$573,944

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Real Estate, Federal Income Tax Basis	$7,500,000,000	$7,400,000,000
Distribution of REIT Taxable Income	100.00%
Income Tax Expense (Benefit)	0
Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT	4 years
Liability for Uncertain Tax Positions, Current	0
Income Tax Examination, Penalties and Interest Expense	0	0	0
Income Tax Examination, Penalties and Interest Accrued	0	0
Taxable REIT Subsidiary [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	28,700,000
Operating Loss Carryforwards, Expiration Dates	1-Jan-18
Valuation Allowance, Amount	$28,700,000

Income_per_Common_Share_of_the2

Income per Common Share of the Trust (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income Available to Common Stockholders, Basic [Abstract]
Income from continuing operations net of noncontrolling interest																	$170,471	$91,274	$88,008
Discontinued operations net of noncontrolling interest																	47,439	118,464	49,428
Net income available to common shareholders																	$217,910	$209,738	$137,436
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic																	147,216	130,180	116,863
Dilutive shares for long-term compensation plans																	670	729	831
Weighted Average Number of Shares Outstanding, Diluted																	147,886	130,909	117,694
Earnings Per Share, Basic [Abstract]
Income per common share - basic	$0.56	[1]	$0.23	[1]	$0.20	[1]	$0.49	[1]	$0.48	[1]	$0.21	[1]	$0.33	[1]	$0.60	[1]
Earnings Per Share, Diluted [Abstract]
Income per common share - diluted	$0.55	[1]	$0.23	[1]	$0.20	[1]	$0.49	[1]	$0.48	[1]	$0.21	[1]	$0.33	[1]	$0.60	[1]
Common shares [Member]
Earnings Per Share, Basic [Abstract]
Income from Continuing Operations, Per Basic Share																	$1.16	$0.70	$0.75
Income from Discontinued Operations, Per Basic Share																	$0.32	$0.91	$0.43
Income per common share - basic																	$1.48	$1.61	$1.18
Earnings Per Share, Diluted [Abstract]
Income from Continuing Operations, Per Diluted Share																	$1.15	$0.70	$0.75
Income from Discontinued Operations, Per Diluted Share																	$0.32	$0.90	$0.42
Income per common share - diluted																	$1.47	$1.60	$1.17
[1]	The sum of quarterly financial data may vary from the annual data due to rounding.

Income_per_Common_Share_of_the3

Income per Common Share of the Trust - Anti-Dilutive (Details) (Stock Option [Member])	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Option [Member]
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Options Excluded from Computation of Earnings Per Share, Amount	850	959	905

Income_per_Common_Share_of_the4

Income per Common Share of the Trust - Dilutive (Details) (Stock Option [Member], Common shares [Member])	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Option [Member] | Common shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Option Exercises in Period	44	504	841

Income_per_Common_Share_of_the5

Income per Common Share of the Trust - Units and Distributions (Details) (Common shares [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common shares [Member]
Class of Stock [Line Items]
Number of common units converted	3,000	157,285	94,895
Distributions per common share	$1.90	$1.90	$1.90

Income_per_Common_Unit_of_the_2

Income per Common Unit of the Operating Partnership (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income Available to Common Unitholders, Basic [Abstract]
Income from continuing operations net of noncontrolling interest																	$170,471	$91,274	$88,008
Excess of preferred unit redemption over carrying amount																		-1,236
Excess of preferred unit carrying amount over redemption																			3,689
Discontinued operations	306		133		296		47,846		51,832		6,544		13,633		49,830		48,581	121,839	51,004
Net income available to common shareholders																	217,910	209,738	137,436
Weighted Average Number of Units Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic																	147,216	130,180	116,863
Dilutive units for long-term compensation plans																	670	729	831
Weighted Average Number of Shares Outstanding, Diluted																	147,886	130,909	117,694
Earnings Per Share, Basic [Abstract]
Income per common share - basic	$0.56	[1]	$0.23	[1]	$0.20	[1]	$0.49	[1]	$0.48	[1]	$0.21	[1]	$0.33	[1]	$0.60	[1]
Earnings Per Share, Diluted [Abstract]
Income per common share - diluted	$0.55	[1]	$0.23	[1]	$0.20	[1]	$0.49	[1]	$0.48	[1]	$0.21	[1]	$0.33	[1]	$0.60	[1]
Liberty Property Limited Partnership [Member]
Net Income Available to Common Unitholders, Basic [Abstract]
Income from continuing operations net of noncontrolling interest																	175,035	97,102	97,022
Less: Preferred unit distributions																	-472	-2,119	-9,902
Excess of preferred unit redemption over carrying amount																	0	-1,236
Excess of preferred unit carrying amount over redemption																	0		3,689
Income from Continuing Operations available to Common Unitholders																	174,563	93,747	90,809
Discontinued operations																	48,581	121,839	51,004
Net income available to common shareholders																	$223,144	$215,586	$141,813
Weighted Average Number of Units Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic																	150,770	133,858	120,623
Dilutive units for long-term compensation plans																	670	729	831
Weighted Average Number of Shares Outstanding, Diluted																	151,440	134,587	121,454
Liberty Property Limited Partnership [Member] | Common Units [Member]
Earnings Per Share, Basic [Abstract]
Income from Continuing Operations, Per Basic Share																	$1.16	$0.70	$0.75
Income from Discontinued Operations, Per Basic Share																	$0.32	$0.91	$0.43
Income per common share - basic																	$1.48	$1.61	$1.18
Earnings Per Share, Diluted [Abstract]
Income from Continuing Operations, Per Diluted Share																	$1.15	$0.70	$0.75
Income from Discontinued Operations, Per Diluted Share																	$0.32	$0.90	$0.42
Income per common share - diluted																	$1.47	$1.60	$1.17
[1]	The sum of quarterly financial data may vary from the annual data due to rounding.

Income_per_Common_Unit_of_the_3

Income per Common Unit of the Operating Partnership - Anti-Dilutive (Details) (Stock Option [Member])	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Options Excluded from Computation of Earnings Per Unit, Amount	850	959	905
Liberty Property Limited Partnership [Member]
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Options Excluded from Computation of Earnings Per Unit, Amount	850	959	905

Income_per_Common_Unit_of_the_4

Income per Common Unit of the Operating Partnership - Dilutive (Details) (Liberty Property Limited Partnership [Member], Stock Option [Member], Common Units [Member])	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liberty Property Limited Partnership [Member] | Stock Option [Member] | Common Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Option Exercises in Period	44	504	841

Income_per_Common_Unit_of_the_5

Income per Common Unit of the Operating Partnership - Units and Distributions (Details) (Liberty Property Limited Partnership [Member], Common Units [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liberty Property Limited Partnership [Member] | Common Units [Member]
Class of Stock [Line Items]
Distributions per common unit	$1.90	$1.90	$1.90

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Beginning balance	$8,592		$3,195
Translation adjustment	-14,415		5,397
Ending balance	-5,823		8,592
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Beginning balance	1,584		0
Unrealized (loss) gain	-3,419		1,584
Reclassification adjustment	1,458	[1]	0	[1]
Ending balance	-377		1,584
Total accumulated other comprehensive income	-6,200		10,176
Less: portion included in noncontrolling interest b operating partnership	-52		-434
Total accumulated other comprehensive income included in shareholders' equity	($6,252)		$9,742
[1]	(1)Amounts reclassified out of Accumulated Other Comprehensive (Loss) Income into contractual interest expense.

Real_Estate_Details

Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	$1,189,760,000	$1,137,897,000
Building and improvements	5,343,908,000	5,129,702,000
Total Real Estate Investment Property, at Cost	6,533,668,000	6,267,599,000
Accumulated Depreciation	1,182,569,000	1,051,593,000
Depreciation	179,100,000	162,500,000	140,600,000
Industrial Property [Member]
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	773,874,000	707,951,000
Building and improvements	3,513,534,000	3,236,596,000
Total Real Estate Investment Property, at Cost	4,287,408,000	3,944,547,000
Accumulated Depreciation	620,967,000	514,073,000
Office Building [Member]
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	415,886,000	429,946,000
Building and improvements	1,830,374,000	1,893,106,000
Total Real Estate Investment Property, at Cost	2,246,260,000	2,323,052,000
Accumulated Depreciation	$561,602,000	$537,520,000

Real_Estate_Properties_Sold_De

Real Estate Properties Sold (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disposition Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$559,322	$526,949	$234,686
Building and Building Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	65	58
Sold Real Estate Property, Square Feet	4,740,329	5,123,172
Proceeds from Sale of Real Estate Held-for-investment	558,578	491,780
Building and Building Improvements [Member] | Houston [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	5
Sold Real Estate Property, Square Feet	553,510
Proceeds from Sale of Real Estate Held-for-investment	29,721
Building and Building Improvements [Member] | Lehigh Central PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold		1
Sold Real Estate Property, Square Feet		101,750
Proceeds from Sale of Real Estate Held-for-investment		8,650
Building and Building Improvements [Member] | Carolinas [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold		1
Sold Real Estate Property, Square Feet		59,200
Proceeds from Sale of Real Estate Held-for-investment		2,000
Building and Building Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	1	12
Sold Real Estate Property, Square Feet	191,336	915,693
Proceeds from Sale of Real Estate Held-for-investment	41,000	71,493
Building and Building Improvements [Member] | Orlando [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	4
Sold Real Estate Property, Square Feet	588,678
Proceeds from Sale of Real Estate Held-for-investment	116,750
Building and Building Improvements [Member] | Richmond Hampton Roads [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold		1
Sold Real Estate Property, Square Feet		86,170
Proceeds from Sale of Real Estate Held-for-investment		10,978
Building and Building Improvements [Member] | Philadelphia [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold		2
Sold Real Estate Property, Square Feet		656,350
Proceeds from Sale of Real Estate Held-for-investment		103,650
Building and Building Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	3	5
Sold Real Estate Property, Square Feet	113,833	996,874
Proceeds from Sale of Real Estate Held-for-investment	12,225	102,734
Building and Building Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	2	36
Sold Real Estate Property, Square Feet	134,510	2,307,135
Proceeds from Sale of Real Estate Held-for-investment	8,655	192,275
Maryland [Member] | Building and Building Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	23
Sold Real Estate Property, Square Feet	1,367,569
Proceeds from Sale of Real Estate Held-for-investment	185,460
New Jersey [Member] | Building and Building Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of Real Estate Properties Sold	27
Sold Real Estate Property, Square Feet	1,790,893
Proceeds from Sale of Real Estate Held-for-investment	$164,767

Investments_in_Unconsolidated_3

Investments in Unconsolidated Joint Ventures (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Accumulated depreciation	($1,182,569,000)		($1,051,593,000)		($1,067,272,000)		($953,573,000)
Operating real estate	5,351,099,000		5,216,006,000
Development in Process	277,411,000		209,187,000
Land held for development	269,059,000		233,055,000
Other liabilities	219,418,000		250,819,000
Company's net investment in unconsolidated joint ventures	208,832,000		179,655,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	-3,200,000		41,700,000
Operating income	257,423,000		203,047,000		189,942,000
Interest	-151,887,000		-127,115,000		-103,363,000
Depreciation and amortization	-236,075,000		-205,147,000		-167,421,000
Equity in earnings (loss) of unconsolidated joint ventures	10,314,000		6,067,000		-681,000
Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	173,346,000		129,354,000
Accumulated depreciation	-32,752,000		-32,617,000
Operating real estate	140,594,000		96,737,000
Development in Process	0		2,226,000
Land held for development	14,108,000		2,842,000
Other assets	15,523,000		11,531,000
Total assets	170,225,000		113,336,000
Debt	78,748,000		72,121,000
Other liabilities	5,215,000		4,032,000
Equity	86,262,000		37,183,000
Total liabilities and equity	170,225,000		113,336,000
Company's net investment in unconsolidated joint ventures	20,010,000	[1]	8,551,000	[1]
Total revenue	19,277,000		16,238,000		15,328,000	[2]
Operating expense	6,398,000		5,248,000		5,277,000	[2]
Operating income	12,879,000		10,990,000		10,051,000	[2]
Interest	-5,078,000		-5,318,000		-5,402,000	[2]
Depreciation and amortization	-5,757,000		-4,414,000		-3,930,000	[2]
Other income/(expense)	-17,000		53,000		40,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0		0		0	[2]
Net income (loss)	2,027,000		1,311,000		759,000
Equity in earnings (loss) of unconsolidated joint ventures	788,000		530,000		306,000
Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	173,707,000		182,220,000
Accumulated depreciation	-26,494,000		-25,006,000
Operating real estate	147,213,000		157,214,000
Development in Process	0		0
Land held for development	0		0
Other assets	14,928,000		20,173,000
Total assets	162,141,000		177,387,000
Debt	91,356,000		97,091,000
Other liabilities	94,504,000		100,112,000
Equity	-23,719,000		-19,816,000
Total liabilities and equity	162,141,000		177,387,000
Company's net investment in unconsolidated joint ventures	11,663,000	[1]	12,772,000	[1]
Total revenue	13,221,000		12,701,000		15,642,000	[2]
Operating expense	5,387,000		4,187,000		4,237,000	[2]
Operating income	7,834,000		8,514,000		11,405,000	[2]
Interest	-6,110,000		-5,133,000		-6,520,000	[2]
Depreciation and amortization	-4,135,000		-3,829,000		-3,731,000	[2]
Other income/(expense)	208,000		71,000		-160,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0		-5,647,000		0	[2]
Net income (loss)	-2,203,000		-6,024,000		994,000
Equity in earnings (loss) of unconsolidated joint ventures	-288,000		-908,000		352,000
Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	260,988,000		261,375,000
Accumulated depreciation	-48,191,000		-43,304,000
Operating real estate	212,797,000		218,071,000
Development in Process	17,973,000		0
Land held for development	28,362,000		42,770,000
Other assets	20,182,000		20,346,000
Total assets	279,314,000		281,187,000
Debt	145,752,000		140,400,000
Other liabilities	13,812,000		7,936,000
Equity	119,750,000		132,851,000
Total liabilities and equity	279,314,000		281,187,000
Company's net investment in unconsolidated joint ventures	18,692,000	[1]	21,688,000	[1]
Total revenue	25,181,000		24,455,000		22,156,000	[2]
Operating expense	8,965,000		8,353,000		8,093,000	[2]
Operating income	16,216,000		16,102,000		14,063,000	[2]
Interest	-7,932,000		-8,348,000		-8,348,000	[2]
Depreciation and amortization	-7,380,000		-7,382,000		-7,395,000	[2]
Other income/(expense)	39,000		38,000		31,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	187,000		0		0	[2]
Net income (loss)	1,130,000		410,000		-1,649,000
Equity in earnings (loss) of unconsolidated joint ventures	824,000		618,000		106,000
Blythe Valley JV Sarl [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue					14,278,000	[2]
Operating expense					3,921,000	[2]
Operating income					10,357,000	[2]
Interest					-12,130,000	[2]
Depreciation and amortization					-4,148,000	[2]
Other income/(expense)					211,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges					-77,026,000	[2]
Net income (loss)					-82,736,000
Equity in earnings (loss) of unconsolidated joint ventures					-5,610,000
Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	603,413,000		887,452,000
Accumulated depreciation	-35,384,000		-131,064,000
Operating real estate	568,029,000		756,388,000
Development in Process	0		0
Land held for development	2,000,000		2,000,000
Other assets	50,657,000		58,701,000
Total assets	620,686,000		817,089,000
Debt	318,367,000		319,856,000
Other liabilities	12,022,000		15,012,000
Equity	290,297,000		482,221,000
Total liabilities and equity	620,686,000		817,089,000
Company's net investment in unconsolidated joint ventures	69,230,000	[1]	72,981,000	[1]
Total revenue	72,824,000		75,821,000		81,128,000	[2]
Operating expense	28,349,000		27,549,000		27,901,000	[2]
Operating income	44,475,000		48,272,000		53,227,000	[2]
Interest	-18,612,000		-18,946,000		-21,260,000	[2]
Depreciation and amortization	-27,112,000		-28,392,000		-28,749,000	[2]
Other income/(expense)	375,000		122,000		149,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	-172,691,000		-8,731,000		0	[2]
Net income (loss)	-173,565,000		-7,675,000		3,367,000
Equity in earnings (loss) of unconsolidated joint ventures	2,251,000		3,748,000		3,243,000
Liberty Commerz 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	494,678,000		494,150,000
Accumulated depreciation	-97,189,000		-83,461,000
Operating real estate	397,489,000		410,689,000
Development in Process	0		0
Land held for development	0		0
Other assets	52,393,000		50,680,000
Total assets	449,882,000		461,369,000
Debt	317,934,000		321,401,000
Other liabilities	9,657,000		9,544,000
Equity	122,291,000		130,424,000
Total liabilities and equity	449,882,000		461,369,000
Company's net investment in unconsolidated joint ventures	23,153,000	[1]	24,740,000	[1]
Total revenue	63,580,000		62,411,000		62,484,000	[2]
Operating expense	23,557,000		23,074,000		22,935,000	[2]
Operating income	40,023,000		39,337,000		39,549,000	[2]
Interest	-20,179,000		-20,391,000		-20,501,000	[2]
Depreciation and amortization	-14,591,000		-14,734,000		-15,411,000	[2]
Other income/(expense)	-278,000		-233,000		-80,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0		0		0	[2]
Net income (loss)	4,975,000		3,979,000		3,557,000
Equity in earnings (loss) of unconsolidated joint ventures	1,633,000		1,406,000		1,304,000
Liberty Property 18th & Arch [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	0	[3]
Accumulated depreciation	0	[3]
Operating real estate	0	[3]
Development in Process	111,244,000	[3]
Land held for development	0	[3]
Other assets	1,306,000	[3]
Total assets	112,550,000	[3]
Debt	0	[3]
Other liabilities	13,398,000	[3]
Equity	99,152,000	[3]
Total liabilities and equity	112,550,000	[3]
Company's net investment in unconsolidated joint ventures	21,292,000	[1],[3]
Total revenue	0	[3]
Operating expense	199,000	[3]
Operating income	-199,000	[3]
Interest	0	[3]
Depreciation and amortization	0	[3]
Other income/(expense)	-13,000	[3]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	[3]
Net income (loss)	-212,000	[3]
Equity in earnings (loss) of unconsolidated joint ventures	-33,000	[3]
Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	69,041,000		70,274,000
Accumulated depreciation	-9,651,000		-8,456,000
Operating real estate	59,390,000		61,818,000
Development in Process	4,366,000		0
Land held for development	39,438,000		47,549,000
Other assets	38,215,000		15,911,000
Total assets	141,409,000		125,278,000
Debt	43,114,000		43,151,000
Other liabilities	14,306,000		9,846,000
Equity	83,989,000		72,281,000
Total liabilities and equity	141,409,000		125,278,000
Company's net investment in unconsolidated joint ventures	44,792,000	[1]	38,923,000	[1]
Total revenue	8,923,000		8,415,000		7,481,000	[2]
Operating expense	2,897,000		2,636,000		2,392,000	[2]
Operating income	6,026,000		5,779,000		5,089,000	[2]
Interest	-3,415,000		-2,933,000		-2,989,000	[2]
Depreciation and amortization	-1,891,000		-1,870,000		-1,885,000	[2]
Other income/(expense)	9,090,000	[4]	-37,000		21,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0		0		0	[2]
Net income (loss)	9,810,000		939,000		236,000
Equity in earnings (loss) of unconsolidated joint ventures	5,139,000		673,000		-382,000
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Real estate assets	1,775,173,000		2,024,825,000
Accumulated depreciation	-249,661,000		-323,908,000
Operating real estate	1,525,512,000		1,700,917,000
Development in Process	133,583,000		2,226,000
Land held for development	83,908,000		95,161,000
Other assets	193,204,000		177,342,000
Total assets	1,936,207,000		1,975,646,000
Debt	995,271,000		994,020,000
Other liabilities	162,914,000		146,482,000
Equity	778,022,000		835,144,000
Total liabilities and equity	1,936,207,000		1,975,646,000
Company's net investment in unconsolidated joint ventures	208,832,000	[1]	179,655,000	[1]
Total revenue	203,006,000		200,041,000		218,497,000	[2]
Operating expense	75,752,000		71,047,000		74,756,000	[2]
Operating income	127,254,000		128,994,000		143,741,000	[2]
Interest	-61,326,000		-61,069,000		-77,150,000	[2]
Depreciation and amortization	-60,866,000		-60,621,000		-65,249,000	[2]
Other income/(expense)	9,404,000		14,000		212,000	[2]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	-172,504,000		-14,378,000		-77,026,000	[2]
Net income (loss)	-158,038,000		-7,060,000		-75,472,000
Equity in earnings (loss) of unconsolidated joint ventures	$10,314,000		$6,067,000		($681,000)
[1]	Differences between the Company's net investment in unconsolidated joint ventures and its underlying equity in the net assets of the venture are primarily a result of impairments related to the Company's investment in unconsolidated joint ventures, the deferral of gains associated with the sales of properties to joint ventures in which the Company retains an ownership interest and loans made to the joint ventures by the Company. These adjustments have resulted in an aggregate difference increasing the Company's investments in unconsolidated joint ventures by $3.2 million as of December 31, 2014 and reducing the Company's investment in unconsolidated joint ventures by $41.7 million as of December 31, 2013. Differences between historical cost basis and the basis reflected at the joint venture level (other than loans) are typically depreciated over the life of the related asset.
[2]	The year ended December 31, 2012 has not been restated for discontinued operations.
[3]	Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia.
[4]	Other income/(expense) for this group of joint ventures reflects gains related to the sales of land leasehold interests totaling $9.1 million.

Investments_in_Unconsolidated_4

Investments in Unconsolidated Joint Ventures - Narrative (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Jun. 30, 2014
								investment
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale of Properties	$43,200,000		$91,661,000		$98,403,000		$12,426,000
Company's net investment in unconsolidated joint ventures	208,832,000		208,832,000		179,655,000
Impairment of Real Estate			100,000		900,000		2,300,000
Development in Process	277,411,000		277,411,000		209,187,000
Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Company's net investment in unconsolidated joint ventures	20,010,000	[1]	20,010,000	[1]	8,551,000	[1]
Development in Process	0		0		2,226,000
Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Company's net investment in unconsolidated joint ventures	11,663,000	[1]	11,663,000	[1]	12,772,000	[1]
Development in Process	0		0		0
Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Company's net investment in unconsolidated joint ventures	18,692,000	[1]	18,692,000	[1]	21,688,000	[1]
Development in Process	17,973,000		17,973,000		0
Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Company's net investment in unconsolidated joint ventures	69,230,000	[1]	69,230,000	[1]	72,981,000	[1]
Development in Process	0		0		0
Liberty Commerz 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Company's net investment in unconsolidated joint ventures	23,153,000	[1]	23,153,000	[1]	24,740,000	[1]
Development in Process	0		0		0
Comcast Innovation and Technology Center [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity method investments								2
Ownership Percentage	20.00%		20.00%
Anticipated aggregate investment	921,000,000		921,000,000
Anticipated investment in joint ventures	184,000,000		184,000,000
Company's net investment in unconsolidated joint ventures	21,300,000		21,300,000
Number of stories in a high-rise building	59		59
Net Rentable Area	1,300,000		1,300,000
Number of hotel rooms	222		222
Development in Process	111,200,000		111,200,000
Cambridge Medipark Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	0		0
United Kingdom [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	20.00%		20.00%
Square Footage of Real Estate Property	490,000		490,000
United Kingdom [Member] | Blythe Valley JV Sarl [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage							20.00%
Company's net investment in unconsolidated joint ventures	0		0				0
Impairment of Real Estate, Attributable to Parent							4,600,000
United Kingdom [Member] | Silversword Properties Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%		50.00%
United Kingdom [Member] | Cambridge Medipark Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%		50.00%
Chicago Milwaukee [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%		25.00%
Square Footage of Real Estate Property	5,100,000		5,100,000
Acres of Developable Land	248		248
Other Segments [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	1		1
Square Footage of Real Estate Property	83,000		83,000
Other Segments [Member] | Liberty AIPO, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%		50.00%
Philadelphia [Member] | Liberty Commerz 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	20.00%		20.00%
Number of Real Estate Properties	1		1
Square Footage of Real Estate Property	1,250,000		1,250,000
Philadelphia [Member] | Liberty Property 19th & Arch LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%		50.00%
Acres of Developable Land	1		1
Construction in Progress [Member] | Chicago Milwaukee [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Square Footage of Real Estate Property	430,000		430,000
Anticipated aggregate investment	24,400,000		24,400,000
Industrial Property [Member] | United Kingdom [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	3		3
Industrial Property [Member] | Chicago Milwaukee [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	15		15
Industrial Property [Member] | Construction in Progress [Member] | Chicago Milwaukee [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	1		1
Office Building [Member] | United Kingdom [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	11		11
Office Building [Member] | United Kingdom [Member] | Silversword Properties Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	1		1
Leaseholds and Leasehold Improvements [Member] | United Kingdom [Member] | Cambridge Medipark Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale of Properties			9,100,000
New Jersey [Member] | Other Segments [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%		25.00%
Square Footage of Real Estate Property	3,900,000		3,900,000
Acres of Developable Land	93		93
New Jersey [Member] | Industrial Property [Member] | Other Segments [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	27		27
Orlando [Member] | Construction in Progress [Member] | Other Segments [Member] | Liberty AIPO, LP [Member]
Schedule of Equity Method Investments [Line Items]
Square Footage of Real Estate Property	369,000		369,000
Anticipated aggregate investment	20,500,000		20,500,000
Orlando [Member] | Industrial Property [Member] | Other Segments [Member] | Liberty AIPO, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	4		4
Orlando [Member] | Industrial Property [Member] | Construction in Progress [Member] | Other Segments [Member] | Liberty AIPO, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	2		2
Northern Virginia and Washington DC [Member] | Other Segments [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%		25.00%
Square Footage of Real Estate Property	2,400,000		2,400,000
Acres of Developable Land	6		6
Impairment of Real Estate	$173,000,000
Northern Virginia and Washington DC [Member] | Office Building [Member] | Other Segments [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	21		21
[1]	Differences between the Company's net investment in unconsolidated joint ventures and its underlying equity in the net assets of the venture are primarily a result of impairments related to the Company's investment in unconsolidated joint ventures, the deferral of gains associated with the sales of properties to joint ventures in which the Company retains an ownership interest and loans made to the joint ventures by the Company. These adjustments have resulted in an aggregate difference increasing the Company's investments in unconsolidated joint ventures by $3.2 million as of December 31, 2014 and reducing the Company's investment in unconsolidated joint ventures by $41.7 million as of December 31, 2013. Differences between historical cost basis and the basis reflected at the joint venture level (other than loans) are typically depreciated over the life of the related asset.

Investments_in_Unconsolidated_5

Investments in Unconsolidated Joint Ventures - Related Party (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investee [Member] | Comcast Innovation and Technology Center [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$1,800,000
Philadelphia [Member] | Equity Method Investee [Member] | Liberty Commerz 1701 JFK Boulevard, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	2,400,000	2,200,000	2,200,000
Philadelphia [Member] | Equity Method Investee [Member] | Liberty Commerz 1701 JFK Boulevard, LP [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	409,000	323,000
Philadelphia [Member] | Equity Method Investee [Member] | Liberty Commerz 1701 JFK Boulevard, LP [Member] | Accounts Receivable [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties		135,000
Philadelphia [Member] | Equity Method Investee [Member] | Liberty Commerz 1701 JFK Boulevard, LP [Member] | Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Due from Related Parties	59,000	59,000
Philadelphia [Member] | Equity Method Investee [Member] | Comcast Innovation and Technology Center [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Due to Related Parties	554,000
United Kingdom [Member] | Equity Method Investee [Member] | Kings Hill Unit Trust [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	285,000	237,000	333,000
Related Party Transaction Rate Range, Min	2.00%
Related Party Transaction Rate Range, Max	10.00%
Related Party Transaction, Due Date	2/1/16
Prepaid Expense, Related Party		47,000
United Kingdom [Member] | Equity Method Investee [Member] | Kings Hill Unit Trust [Member] | Accounts Receivable [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	267,000	133,000
United Kingdom [Member] | Equity Method Investee [Member] | Kings Hill Unit Trust [Member] | Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Notes Receivable, Related Parties	18,100,000	18,600,000
United Kingdom [Member] | Equity Method Investee [Member] | Blythe Valley JV Sarl [Member]
Related Party Transaction [Line Items]
Management Fees Revenue		33,000	355,000
United Kingdom [Member] | Equity Method Investee [Member] | Cambridge Medipark Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due Date	0
Related Party Transaction, Rate	0.00%
United Kingdom [Member] | Equity Method Investee [Member] | Cambridge Medipark Ltd [Member] | Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Notes Payable, Related Parties	2,900,000	3,000,000
Chicago Milwaukee [Member] | Equity Method Investee [Member] | Liberty Illinois, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	1,000,000	952,000	655,000
New Jersey [Member] | Other Segments [Member] | Equity Method Investee [Member] | Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	1,400,000	578,000	619,000
New Jersey [Member] | Land, Buildings and Improvements [Member] | Other Segments [Member] | General Partner [Member] | Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Number of real estate properties acquired	3
Related Party Transaction, Purchases from Related Party	43,000,000
New Jersey [Member] | Building and Building Improvements [Member] | Other Segments [Member] | General Partner [Member] | Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Net rentable area acquired	603,000
New Jersey [Member] | Land [Member] | Other Segments [Member] | General Partner [Member] | Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Area of Land	51
Northern Virginia and Washington DC [Member] | Other Segments [Member] | Equity Method Investee [Member] | Liberty Washington, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	4,400,000	4,900,000	4,500,000
Northern Virginia and Washington DC [Member] | Other Segments [Member] | Equity Method Investee [Member] | Liberty Washington, LP [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Due from Related Parties	470,000	523,000
Northern Virginia and Washington DC [Member] | Other Segments [Member] | Equity Method Investee [Member] | Liberty Washington, LP [Member] | Accounts Receivable [Member]
Related Party Transaction [Line Items]
Due from Related Parties		$98,000

Deferred_Financing_and_Leasing3

Deferred Financing and Leasing Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of Financing Costs	$4,800,000	$4,100,000	$4,900,000
Amortization of Deferred Leasing Costs and Intangible Leases, Acquired-in-place	51,300,000	39,200,000	24,000,000
Finite-Lived Intangible Assets, Gross [Abstract]
Deferred financing costs, gross	38,445,000	36,883,000
Deferred leasing costs, gross	215,714,000	192,194,000
Intangible - market rent, gross	18,082,000	19,366,000
Intangible - origination value, gross	103,512,000	117,905,000
Finite-Lived Intangible Assets, Gross	375,753,000	366,348,000
Finite-Lived Intangible Assets, Accumulated Amortization [Abstract]
Deferred financing costs, accumulated amortization	-20,284,000	-17,536,000
Deferred leasing costs, accumulated amortization	-100,702,000	-91,989,000
Intangible - market rent, accumulated amortization	-8,266,000	-4,180,000
Intangible - origination value, accumulated amortization	-40,215,000	-26,576,000
Finite-Lived Intangible Assets, Accumulated Amortization	-169,467,000	-140,281,000
Deferred financing and leasing costs, net	$206,286,000	$226,067,000

Deferred_Financing_and_Leasing4

Deferred Financing and Leasing Costs Finite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Deferred financing costs, gross	$38,445,000	$36,883,000
Below Market Lease, Net	7,500,000	9,100,000
Amortization of above and below Market Leases	-2,800,000	-290,000	491,000
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Amortization Period	3 years 2 months 0 days
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Amortization Period	4 years 5 months 2 days
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$21,292,000

Deferred_Financing_and_Leasing5

Deferred Financing and Leasing Costs Intangible Amortization Schedule (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]
Deferred financing and leasing costs, net	$206,286	$226,067
Leases, Acquired-in-Place, Market Adjustment [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2015	2,047
2016	1,426
2017	586
2018	80
2019	3
Thereafter	-1,779
Deferred financing and leasing costs, net	2,363
Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2015	21,292
2016	16,273
2017	10,614
2018	6,249
2019	3,081
Thereafter	5,788
Deferred financing and leasing costs, net	$63,297

Indebtedness_Overview_Details

Indebtedness - Overview (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Debt, Weighted Average Interest Rate	5.00%	5.10%	5.30%
Interest Costs, Capitalized During Period	$13.20	$9.60	$9.90
Cash paid for interest	$164.90	$143.20	$132.20

Indebtedness_Amortization_and_

Indebtedness - Amortization and Maturity Schedule (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
2015	$328,175
2016	493,663
2017	309,308
2018	302,757
2019	58,868
2020	421,165
2021	67,724
2022	401,630
2023	302,085
2024 and thereafter	478,020
Long-term Debt, Maturities Total	3,163,395
Long-term Debt, Weighted Average Interest Rate	4.78%
Principal Amortization, Mortgages [Member]
Debt Instrument [Line Items]
2015	12,194
2016	11,768
2017	10,916
2018	8,730
2019	8,825
2020	4,280
2021	2,716
2022	2,211
2023	2,319
2024 and thereafter	27,266
Long-term Debt, Maturities Total	91,225
Principal Maturities, Mortgages [Member]
Debt Instrument [Line Items]
2015	0
2016	182,318
2017	2,349
2018	27,051
2019	50,043
2020	67,361
2021	65,008
2022	0
2023	0
2024 and thereafter	1,946
Long-term Debt, Maturities Total	396,076
Unsecured Debt [Member]
Debt Instrument [Line Items]
2015	315,981
2016	299,577
2017	296,043
2018	99,976
2019	0
2020	349,524
2021	0
2022	399,419
2023	299,766
2024 and thereafter	448,808
Long-term Debt, Maturities Total	2,509,094
Line of Credit [Member]
Debt Instrument [Line Items]
2015	0
2016	0
2017	0
2018	167,000
2019	0
2020	0
2021	0
2022	0
2023	0
2024 and thereafter	0
Long-term Debt, Maturities Total	$167,000
Due in Next Twelve Months [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	5.04%
Due in Year Two [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.08%
Due in Year Three [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.56%
Due in Year Four [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	3.61%
Due in Year Five [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.00%
Due in Year Six [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.83%
Due in Year Seven [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.06%
Due in Year Eight [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.13%
Due in Year Nine [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	3.39%
Due After Year Nine [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.43%

Indebtedness_Mortgage_Loans_Un

Indebtedness - Mortgage Loans, Unsecured Notes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Aggregate notional amount	$103.60	$105.20
Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start	1-Jan-16
Debt Instrument, Maturity Date Range, End	31-Dec-33
Net Book Value of Collateralized Real Estate Properties	908.5
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	2,980.40
Aggregate notional amount	$103.60
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	7.50%
Mortgage Loans and Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted Average Remaining Life	5 years 5 months

Indebtedness_Credit_Facility_D

Indebtedness - Credit Facility (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Number of maturity extensions	2
Long-term Debt, Maturities Total	$3,163,395,000
Line of Credit Facility, Amount Outstanding	167,000,000	0
Total Assets for Covenant Ratio	6,625,536,000	6,775,560,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.05%
Line of Credit Facility, Expiration Date	1-Mar-18
Length of Maturity Extension	6 months
Line of Credit Facility, Competitive Bid Option, Percentage	50.00%
Long-term Debt, Maturities Total	167,000,000
Line of Credit Facility, Commitment Fee Percentage	0.20%
Line of Credit [Member] | Total Debt to Total Assets Ratio [Member]
Line of Credit Facility [Line Items]
Borrowed Funds for Covenant Ratio	0.6
Total Assets for Covenant Ratio	1
Line of Credit [Member] | EBITDA to Fixed Charges Ratio [Member]
Line of Credit Facility [Line Items]
Earnings Before Interest, Taxes, Depreciation and Amortization for Covenant Ratio	$1.50
Line of Credit [Member] | Unsecured Debt to Unencumbered Asset Ratio [Member]
Line of Credit Facility [Line Items]
Unsecured Debt to Unencumbered Asset Value for Debt Covenant	60.00%
Line of Credit [Member] | Unencumbered Net Operating Income to Unsecured Interest Expense [Member]
Line of Credit Facility [Line Items]
Unencumbered Net Operating Income to Unsecured Interest Expense Value for Debt Covenant	175.00%

Indebtedness_Activity_Details

Indebtedness - Activity (Details) (USD $)	1 Months Ended					12 Months Ended	1 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Aug. 31, 2014	Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Aug. 31, 2012	Dec. 31, 2014	Feb. 28, 2012	Oct. 08, 2013	Dec. 31, 2013	Mar. 31, 2014
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			5.30%			5.00%			5.10%
Credit Facility [Domain] | Old Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Trade Purchases										$500
Credit Facility [Domain] | New Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Trade Purchases										800
Senior Notes [Member] | 5.65% Senior Note [Member]
Debt Instrument [Line Items]
Stated Interest Rate	5.65%
Repayments of Senior Debt	200
Debt Instrument, Maturity Date, Description	Aug-14
Senior Notes [Member] | 4.40% senior unsecured note [Member]
Debt Instrument [Line Items]
Stated Interest Rate		4.40%
Debt Instrument, Face Amount		450
Debt Instrument, Maturity Date, Description		2024
Senior Notes [Member] | 3.375% senior note [Member]
Debt Instrument [Line Items]
Stated Interest Rate			3.38%
Debt Instrument, Face Amount			300
Debt Instrument, Maturity Date, Description			2023
Senior Notes [Member] | 4.125% Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate				4.13%
Debt Instrument, Face Amount				400
Debt Instrument, Maturity Date, Description				2022
Senior Notes [Member] | 6.375% Senior Notes [Member]
Debt Instrument [Line Items]
Stated Interest Rate					6.38%
Repayments of Senior Debt					230.1
Debt Instrument, Term					10 years
Debt Instrument, Maturity Date, Description					Aug-12
Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start						1-Jan-16
Debt Instrument, Maturity Date Range, End						31-Dec-33
Mortgages [Member] | 4.84% Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date, Description							2033
Debt, Weighted Average Interest Rate							4.84%
Debt Instrument, Borrowing Capacity, Amount							45
Cabot Industrial Value Fund III [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Assumption of mortgage debt from acquisition								$229.80
Debt, Weighted Average Interest Rate								5.85%
Debt Instrument, Maturity Date Range, Start								1-Jan-18
Debt Instrument, Maturity Date Range, End								31-Dec-21

Leasing_Activity_Details

Leasing Activity (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Receivable [Abstract]
2015	$540,996
2016	486,016
2017	400,297
2018	330,906
2019	258,777
Thereafter	1,019,497
Operating Leases, Future Minimum Payments Due	$3,036,489

Noncontrolling_Interest_Operat2

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Preferred Units [Line Items]
Noncontrolling Interest in Operating Partnerships	$7,537,000	$7,537,000
Preferred Units, Total Annual Cash Distributions		1,600,000	9,900,000
Series I 2 [Member]
Preferred Units [Line Items]
Noncontrolling Interest in Operating Partnerships	7,537,000
Temporary Equity, Preferred Units, Outstanding	301,483
Redeemable Preferred Units Liquidation Preference	$25
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.25%
Preferred Units, Total Annual Cash Distributions	$472,000	$472,000	$472,000

Shareholders_Equity_Common_Sha

Shareholders' Equity - Common Shares (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Continuous Equity Offering [Abstract]
Common stock, Continuous equity offering program, Max amount of equity	$200,000,000
Proceeds from Issuance of Common Stock	58,473,000	969,468,000	58,710,000
Common Shares and Common Units [Member]
Common Shares [Abstract]
Dividends, Common Stock, Cash	286,900,000	247,400,000	229,700,000
Common Stock [Member]
Common Shares [Abstract]
Common Stock, Ordinary Dividend, Per Share, Cash Paid	$1.26	$1.43	$1.50
Common Stock, Capital gain 20%, Per Share, Cash Paid	$0	$0.00	$0
Common Stock, IRC SEC 1250 unrecaptured gain 25%, Per Share, Cash Paid	$0.37	$0.47	$0.02
Common Stock, Return of Capital, Per Share, Cash Paid	$0.27	$0	$0.38
Common Stock, Dividends, Per Share, Cash Paid	$1.90	$1.90	$1.90
Dividend Reinvestment and Share Purchase Plan [Abstract]
Stock Issued During Period, Shares, Dividend Reinvestment Plan	1,643,536	1,248,842	1,037,712
Continuous Equity Offering [Abstract]
Number of common shares issued	0	1,900,000	0
Proceeds from Issuance of Common Stock		$75,000,000

Shareholders_Equity_Common_and

Shareholders' Equity - Common and Preferred Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Preferred Units [Line Items]
Market value of outstanding limited partners' common units as of December 31, 2014			$133,700,000
Preferred Units Description and Other Disclosures [Abstract]
Preferred Stock Redemption Premium	1,236,000
Preferred Stock Redemption Discount		3,689,000
Preferred Units, Total Annual Cash Distributions	1,600,000	9,900,000
Authorized but Unissued Preferred Shares			16,013,000
Preferred Units, Outstanding			0
Conversion Ratio of Common Units to Common Shares [Member]
Preferred Units [Line Items]
Common Unit, Convertible to Common Stock			1
Common Stock, Converted from Common Unit			1
Series B Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value		95,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.45%
Preferred Units, Annual Cash Distributions	$0	$0.45
Series E Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	20,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	7.00%
Preferred Units, Annual Cash Distributions	$1.21	$3.50
Series F Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	17,500,000	32,500,000
Payments for Repurchase of Preferred Stock and Preference Stock		26,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.65%	6.65%
Preferred Units, Annual Cash Distributions	$1.32	$1.43
Series G Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value	27,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount	6.70%
Preferred Units, Annual Cash Distributions	$1.33	$3.35
Series H Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Stock Redeemed or Called During Period, Value		$100,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.40%
Preferred Units, Annual Cash Distributions	$0	$0.77

Owners_Equity_Operating_Partne2

Owners' Equity - Operating Partnership(Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Outstanding	0
Preferred Stock Redemption Discount			$3,689,000
Preferred Stock Redemption Premium		1,236,000
Preferred Units, Total Annual Cash Distributions		1,600,000	9,900,000
Continuous Equity Offering [Abstract]
Common stock, Continuous equity offering program, Max amount of equity	200,000,000
Proceeds from Issuance of Common Stock	58,473,000	969,468,000	58,710,000
Series B Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$0	$0.45
Stock Redeemed or Called During Period, Value			95,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount			7.45%
Series E Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$1.21	$3.50
Stock Redeemed or Called During Period, Value		20,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.00%
Series F Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Payments for Repurchase of Preferred Stock and Preference Stock			26,000,000
Preferred Units, Annual Cash Distributions		$1.32	$1.43
Stock Redeemed or Called During Period, Value		17,500,000	32,500,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		6.65%	6.65%
Series G Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$1.33	$3.35
Stock Redeemed or Called During Period, Value		27,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		6.70%
Series H Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$0	$0.77
Stock Redeemed or Called During Period, Value			100,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount			7.40%
Treasury Stock [Member]
Limited Partners' Capital Account [Line Items]
Treasury Stock, Shares, Acquired	0	0	0
Common Stock [Member]
Limited Partners' Capital Account [Line Items]
Limited Partners' Capital Account, Units, Sale of Units	0	0	0
Continuous Equity Offering [Abstract]
Number of common shares issued	0	1,900,000	0
Proceeds from Issuance of Common Stock		75,000,000
Liberty Property Limited Partnership [Member]
Limited Partners' Capital Account [Line Items]
Limited Partners' units outstanding	3,553,566	3,556,566
market value of the outstanding common units	133,700,000
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Outstanding	0
Preferred Stock Redemption Discount	0		3,689,000
Preferred Stock Redemption Premium	0	1,236,000
Preferred Units, Total Annual Cash Distributions		1,600,000	9,900,000
Liberty Property Limited Partnership [Member] | Continuous Equity Offering [Member]
Continuous Equity Offering [Abstract]
Common stock, Continuous equity offering program, Max amount of equity	200,000,000
Liberty Property Limited Partnership [Member] | Series B Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$0	$0.45
Stock Redeemed or Called During Period, Value			95,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount			7.45%
Liberty Property Limited Partnership [Member] | Series E Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$1.21	$3.50
Stock Redeemed or Called During Period, Value		20,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		7.00%
Liberty Property Limited Partnership [Member] | Series F Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Payments for Repurchase of Preferred Stock and Preference Stock			26,000,000
Preferred Units, Annual Cash Distributions		$1.32	$1.43
Stock Redeemed or Called During Period, Value		17,500,000	32,500,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		6.65%	6.65%
Liberty Property Limited Partnership [Member] | Series G Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$1.33	$3.35
Stock Redeemed or Called During Period, Value		27,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount		6.70%
Liberty Property Limited Partnership [Member] | Series H Preferred Stock [Member]
Preferred Units Description and Other Disclosures [Abstract]
Preferred Units, Annual Cash Distributions		$0	$0.77
Stock Redeemed or Called During Period, Value			100,000,000
Preferred Stock Dividends Rate Percentage Or Per Dollar Amount			7.40%
Liberty Property Limited Partnership [Member] | Common Stock [Member]
Limited Partners' Capital Account [Line Items]
Limited Partners' Capital Account, Units, Sale of Units	0	0	0
Continuous Equity Offering [Abstract]
Number of common shares issued	0		0
Liberty Property Limited Partnership [Member] | Common Stock [Member] | Continuous Equity Offering [Member]
Continuous Equity Offering [Abstract]
Number of common shares issued		1,900,000
Proceeds from Issuance of Common Stock		$75,000,000

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plans [Abstract]
Company Match for Defined Contribution Plan	3.00%
Defined Contribution Plan, Cost Recognized	$943,000	$923,000	$865,000

Share_Based_Compensation_Detai

Share Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options [Abstract]
Authorized number of shares under the Plan and the 2008 Plan	21,100,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Common shares reserved for future issuance under the Plan and the 2008 Plan	6,100,098	6,637,761	7,156,179
ESPP [Member]
Options [Abstract]
Allocated Share-based Compensation Expense	$104,000	$71,000	$99,000
Authorized number of shares under the Plan and the 2008 Plan	750,000
Long Term Incentive Shares [Abstract]
Allocated Share-based Compensation Expense	104,000	71,000	99,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Maximum percent of salary contributed	10.00%
Allocated Share-based Compensation Expense	104,000	71,000	99,000
Discount on market value of shares	15.00%
Shares issued	12,612	16,793	18,611
Stock Options [Member] | Options [Member]
Options [Abstract]
option term	10 years
Option - Vesting Period	3 years
Allocated Share-based Compensation Expense	1,800,000	1,600,000	1,700,000
Weighted average fair value of options granted	$4.09	$7.18	$6.55
Exercise price for options outstanding lower limit	$20.32
Exercise price for options outstanding upper limit	$49.74
weighted average remaining contractual life of option outstanding	5 years 4 months 14 days
Weighted average remaining contractual life of options exercisable	4 years 0 months 1 day
Number of options outstanding and exercisable that had an exercise price higher than closing price of the Company's shares	565,000
Number of options outstanding and exercisable that had an exercise price lower than the Company's share price	1,200,000
Total intrinsic value of options exercised	310,000	4,900,000	5,900,000
Total cash received from the exercise of options	1,400,000	15,200,000	22,900,000
Unrecognized compensation costs related to nonvested options	324,000
Compensation costs not yet recognized, period for recognition	0 years 9 months 9 days
Aggregate intrinsic value of options	6,800,000
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Allocated Share-based Compensation Expense	1,800,000	1,600,000	1,700,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	1,800,000	1,600,000	1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	1.60%	1.10%	1.10%
Volatility	23.60%	35.60%	37.70%
Stock Options [Member] | First Portion [Member] | Options [Member]
Options [Abstract]
Vesting percent	20.00%
Stock Options [Member] | Second Portion [Member] | Options [Member]
Options [Abstract]
Vesting percent	50.00%
Stock Options [Member] | Third Portion [Member] | Options [Member]
Options [Abstract]
Vesting percent	100.00%
Restricted Stock [Member] | Long Term Incentive Shares [Member]
Options [Abstract]
Option - Vesting Period	5 years
Allocated Share-based Compensation Expense	9,000,000	9,100,000	8,700,000
Compensation costs not yet recognized, period for recognition	1 year 5 months 1 day
Long Term Incentive Shares [Abstract]
Weighted Average Grant Date Fair Value - Granted	$37.13	$39.42	$34.61
Long Term Incentive Shares - Vesting Period	5 years
Shares granted	263,000
Total unrecognized compensation cost related to nonvested shares	12,500,000
Total fair value of restricted shares vested	9,300,000	9,900,000	8,700,000
Allocated Share-based Compensation Expense	9,000,000	9,100,000	8,700,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	9,000,000	9,100,000	8,700,000
Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	0.68%
Volatility	24.00%
Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate		0.35%
Volatility		26.00%
Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate			0.52%
Volatility			41.00%
Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Restricted Stock Units (RSUs) [Member] | Second Portion [Member] | 2008 plan [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Bonus Shares [Member] | Bonus Shares [Member]
Options [Abstract]
Allocated Share-based Compensation Expense	3,900,000	3,100,000	2,900,000
Long Term Incentive Shares [Abstract]
Shares granted	103,834	79,271	80,573
Allocated Share-based Compensation Expense	3,900,000	3,100,000	2,900,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Percent Applied to Bonuses Taken in Cash	120.00%
Allocated Share-based Compensation Expense	3,900,000	3,100,000	2,900,000
Performance Shares [Member] | Profit Sharing Plan [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Maximum percent of salary contributed	5.00%
Profit sharing plan expense	$543,000	$698,000	$564,000
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] | 2013 [Member]
Options [Abstract]
Vesting percent		272.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] | 2012 [Member]
Options [Abstract]
Vesting percent			272.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | 2014 [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | Maximum [Member] | 2014 [Member]
Options [Abstract]
Vesting percent	272.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2014 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	157.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2013 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation		150.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2012 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation			159.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] | 2013 [Member]
Options [Abstract]
Vesting percent		200.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] | 2012 [Member]
Options [Abstract]
Vesting percent			200.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | 2014 [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | Maximum [Member] | 2014 [Member]
Options [Abstract]
Vesting percent	200.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2014 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	125.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2013 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation		121.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2012 [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation			127.00%

Share_Based_Compensation_Optio

Share Based Compensation - Option Grant Information (Details) (Options [Member], Stock Options [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.60%	1.10%	1.10%
Dividend yield	5.20%	5.40%	5.70%
Historical volatility factor	23.60%	35.60%	37.70%
Weighted-average expected life	6 years	6 years	5 years

Share_Based_Compensation_Optio1

Share Based Compensation - Option Rollforward (Details) (Options [Member], Stock Options [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Options [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price - Outstanding January 1, 2014	$36.90
Weighted Average Exercise Price - Granted	$37.32
Weighted Average Exercise Price - Exercised	$30.66
Weighted Average Exercise Price - Forfeited	$42.69
Weighted Average Exercise Price - Outstanding December 31, 2014	$36.48
Exercisable at December 31, 2014	1,750
Weighted Average Exercise Price - Exercisable at December 31, 2014	$36.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding January 1, 2014	2,355
Granted	439
Exercised	-44
Forfeited	-258
Outstanding December 31, 2014	2,492

Share_Based_Compensation_Share

Share Based Compensation - Share rollforward (Details) (Long Term Incentive Shares [Member], Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long Term Incentive Shares [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value - Nonvested at January 1, 2014	$35.37
Weighted Average Grant Date Fair Value - Granted	$37.13	$39.42	$34.61
Weighted Average Grant Date Fair Value - Vested	$32.93
Weighted Average Grant Date Fair Value - Forfeited	$36.19
Weighted Average Grant Date Fair Value - Nonvested at December 31, 2014	$36.89	$35.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at January 1, 2014	786,000
Granted	263,000
Vested	-282,000
Forfeited	-14,000
Nonvested at December 31, 2014	753,000	786,000

Commitments_and_Contingencies_1

Commitments and Contingencies - Future Minimum Rental Payments (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
2015	$668
2016	687
2017	687
2018	687
2019	687
2020 through 2034	6,608
Total	10,024
Other Expenses [Abstract]
Operating Ground Lease Expense	$454	$210	$162

Commitments_and_Contingencies_2

Commitments and Contingencies Commitments and Contingencies - Loss Contingencies (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Loss Contingency, Information about Litigation Matters [Abstract]
Loss Contingency, Pending Claims, Number	0
Other [Abstract]
Letters of Credit Outstanding, Amount	$4.20

Commitments_and_Contingencies_3

Commitments and Contingencies - Supply Commitments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Supply Commitment [Line Items]
Development in Process	$277,411,000	$209,187,000
Deferred leasing costs, gross	215,714,000	192,194,000
Construction in Progress [Member]
Supply Commitment [Line Items]
Number of Real Estate Properties	25
Square Footage of Real Estate Property	4,300,000
Anticipated aggregate investment	465,100,000
Deferred leasing costs, gross	8,000,000
Building and land parcels [Member]
Supply Commitment [Line Items]
Remaining amount committed or obligated to pay for the benefit of current or future tenants	19,400,000
Tenant Improvements [Member]
Supply Commitment [Line Items]
Supply Commitment, Remaining Maximum Amount Committed	$40,900,000

Commitments_and_Contingencies_4

Commitments and Contingencies Commitments and Contingencies - Purchase Commitments (Details) (Land Purchases [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Land Purchases [Member]
Long-term Purchase Commitment [Line Items]
Remaining amount committed to future land purchases	$41.30

Quarterly_Results_of_Operation2

Quarterly Results of Operations (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Gain (Loss) on Sale of Properties	$43,200																$91,661	$98,403	$12,426
Operating revenue	203,685		198,356		192,960		197,630		192,427		155,349		151,026		147,128		792,631	645,930	560,279
Income from continuing operations	84,193	[1]	35,318		29,811		26,260		19,911		23,406		29,611		24,827		175,582	97,755	96,747
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	306		133		296		47,846		51,832		6,544		13,633		49,830		48,581	121,839	51,004
Net income	$84,499		$35,451		$30,107		$74,106		$71,743		$29,950		$43,244		$74,657		$224,163	$219,594	$147,751
Income per common share - basic	$0.56	[2]	$0.23	[2]	$0.20	[2]	$0.49	[2]	$0.48	[2]	$0.21	[2]	$0.33	[2]	$0.60	[2]
Income per common share - diluted	$0.55	[2]	$0.23	[2]	$0.20	[2]	$0.49	[2]	$0.48	[2]	$0.21	[2]	$0.33	[2]	$0.60	[2]
[1]	Includes gain on sale of $43.2 million.
[2]	The sum of quarterly financial data may vary from the annual data due to rounding.

Segment_Information_Performanc

Segment Information - Performance of the Reportable Segments Based on Property Level Operating Income (Details) (USD $)	3 Months Ended									12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating revenue	$203,685,000		$198,356,000	$192,960,000	$197,630,000	$192,427,000	$155,349,000	$151,026,000	$147,128,000	$792,631,000		$645,930,000		$560,279,000
Operating Income (Loss)										257,423,000		203,047,000		189,942,000
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense										-151,887,000		-127,115,000		-103,363,000
Depreciation and amortization expense										-236,075,000		-205,147,000		-167,421,000
Gain on property dispositions										45,030,000		0		0
Equity in earnings (loss) of unconsolidated joint ventures										10,314,000		6,067,000		-681,000
General and Administrative Expense										-63,327,000		-74,564,000		-64,686,000
Income taxes										-2,967,000		-2,799,000		-976,000
Income from continuing operations	84,193,000	[1]	35,318,000	29,811,000	26,260,000	19,911,000	23,406,000	29,611,000	24,827,000	175,582,000		97,755,000		96,747,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenue										797,723,000		758,965,000		697,298,000
Operating Income (Loss)										493,234,000		450,678,000		409,230,000
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating revenue										-4,728,000		-113,586,000		-137,476,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating revenue										-364,000		551,000		457,000
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense										-152,444,000	[2]	-143,018,000	[2]	-123,146,000	[2]
Depreciation and amortization expense										-177,715,000	[3]	-138,128,000	[3]	-104,643,000	[3]
Gain on property dispositions										45,030,000		0		0
Equity in earnings (loss) of unconsolidated joint ventures										10,314,000		6,067,000		-681,000
General and Administrative Expense										-38,041,000	[3]	-50,998,000	[3]	-40,831,000	[3]
Discontinued operations excluding gain on property dispositions										1,950,000		26,455,000		38,578,000
Income taxes										-2,781,000	[3]	-2,748,000	[3]	-874,000	[3]
Other										-65,000		2,357,000		-3,730,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenue										0		0		0
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Operating revenue										118,145,000		101,101,000		96,804,000
Operating Income (Loss)										82,050,000		68,504,000		65,566,000
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Operating revenue										33,068,000		18,083,000		9,780,000
Operating Income (Loss)										20,856,000		11,726,000		5,329,000
North America [Member] | Operating Segments [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Operating revenue										49,309,000		37,773,000		30,172,000
Operating Income (Loss)										29,134,000		22,632,000		17,862,000
North America [Member] | Operating Segments [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Operating revenue										35,870,000		30,243,000		28,667,000
Operating Income (Loss)										24,578,000		20,434,000		18,733,000
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Operating revenue										54,892,000		62,415,000		57,331,000
Operating Income (Loss)										26,464,000		30,016,000		26,348,000
North America [Member] | Operating Segments [Member] | Orlando [Member]
Segment Reporting Information [Line Items]
Operating revenue										32,674,000		31,400,000		30,844,000
Operating Income (Loss)										21,472,000		20,506,000		20,153,000
North America [Member] | Operating Segments [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Operating revenue										48,804,000		38,464,000		35,628,000
Operating Income (Loss)										27,947,000		20,943,000		18,921,000
North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Operating revenue										40,911,000		40,247,000		41,395,000
Operating Income (Loss)										24,357,000		24,063,000		24,762,000
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Operating revenue										130,013,000	[4]	142,402,000	[4]	117,562,000	[4]
Operating Income (Loss)										83,991,000		81,435,000		64,207,000
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Operating revenue										35,238,000		31,690,000		28,153,000
Operating Income (Loss)										26,722,000		23,587,000		20,527,000
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Operating revenue										148,714,000		165,248,000		169,645,000
Operating Income (Loss)										81,183,000		91,193,000		98,729,000
North America [Member] | Operating Segments [Member] | Tampa [Member]
Segment Reporting Information [Line Items]
Operating revenue										53,725,000		52,230,000		46,627,000
Operating Income (Loss)										33,776,000		33,042,000		28,350,000
UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Operating revenue										16,360,000		7,669,000		4,690,000
Operating Income (Loss)										$10,704,000		$2,597,000		($257,000)
[1]	Includes gain on sale of $43.2 million.
[2]	Includes activity on discontinued operations.
[3]	Excludes costs which are included in determining segment-level net operating income.
[4]	A substantial portion of the buildings contributing to office operating revenue in 2012 and 2013 were sold in conjunction with the Portfolio Sale. See Footnote 19.

Segment_Information_Depreciati

Segment Information - Depreciation and amortization of leasing transaction costs (Details) (Operating Segments [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	$54,903	$64,549	$61,618
UNITED KINGDOM | United Kingdom [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	177	172	269
North America [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	2,329	1,935	1,726
North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	466	251	233
North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	3,988	3,200	2,608
North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	10,157	9,781	9,753
North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	4,478	5,797	5,132
North America [Member] | Orlando [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	3,116	3,037	2,804
North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	1,803	1,729	1,724
North America [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	4,278	4,156	4,157
North America [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	2,824	2,979	3,083
North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	12,272	15,040	14,109
North America [Member] | Tampa [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	3,384	3,033	2,959
North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	$5,631	$13,439	$13,061

Segment_Information_Operating_

Segment Information - Operating Revenues by Segment and Type (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenue from External Customer [Line Items]
Operating revenue	$203,685,000	$198,356,000	$192,960,000	$197,630,000	$192,427,000	$155,349,000	$151,026,000	$147,128,000	$792,631,000		$645,930,000		$560,279,000
Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									797,723,000		758,965,000		697,298,000
Segment Reconciling Items [Member]
Revenue from External Customer [Line Items]
Operating revenue									-4,728,000		-113,586,000		-137,476,000
Corporate, Non-Segment [Member]
Revenue from External Customer [Line Items]
Operating revenue									-364,000		551,000		457,000
North America [Member] | Operating Segments [Member] | Carolinas [Member]
Revenue from External Customer [Line Items]
Operating revenue									35,870,000		30,243,000		28,667,000
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									33,068,000		18,083,000		9,780,000
North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									49,309,000		37,773,000		30,172,000
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									118,145,000		101,101,000		96,804,000
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									54,892,000		62,415,000		57,331,000
North America [Member] | Operating Segments [Member] | Orlando [Member]
Revenue from External Customer [Line Items]
Operating revenue									32,674,000		31,400,000		30,844,000
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									35,238,000		31,690,000		28,153,000
North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]
Revenue from External Customer [Line Items]
Operating revenue									40,911,000		40,247,000		41,395,000
North America [Member] | Operating Segments [Member] | South Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									48,804,000		38,464,000		35,628,000
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									148,714,000		165,248,000		169,645,000
North America [Member] | Operating Segments [Member] | Tampa [Member]
Revenue from External Customer [Line Items]
Operating revenue									53,725,000		52,230,000		46,627,000
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									130,013,000	[1]	142,402,000	[1]	117,562,000	[1]
UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									16,360,000		7,669,000		4,690,000
Industrial Property [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									477,788,000		368,921,000		309,810,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Carolinas [Member]
Revenue from External Customer [Line Items]
Operating revenue									35,870,000		30,243,000		26,818,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									33,068,000		18,083,000		6,908,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									49,309,000		37,773,000		30,172,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									115,821,000		98,715,000		94,440,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									25,378,000		32,043,000		27,810,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Orlando [Member]
Revenue from External Customer [Line Items]
Operating revenue									18,635,000		16,535,000		15,840,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									10,072,000		9,534,000		8,356,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]
Revenue from External Customer [Line Items]
Operating revenue									20,924,000		19,073,000		18,490,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | South Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									18,603,000		7,955,000		5,213,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									28,895,000		27,076,000		28,604,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Tampa [Member]
Revenue from External Customer [Line Items]
Operating revenue									25,451,000		24,331,000		17,584,000
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									82,672,000	[1]	43,355,000	[1]	28,268,000	[1]
Industrial Property [Member] | UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									13,090,000		4,205,000		1,307,000
Office Building [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									319,935,000		390,044,000		387,488,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Carolinas [Member]
Revenue from External Customer [Line Items]
Operating revenue									0		0		1,849,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									0		0		2,872,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									0		0		0
Office Building [Member] | North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									2,324,000		2,386,000		2,364,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									29,514,000		30,372,000		29,521,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Orlando [Member]
Revenue from External Customer [Line Items]
Operating revenue									14,039,000		14,865,000		15,004,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									25,166,000		22,156,000		19,797,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]
Revenue from External Customer [Line Items]
Operating revenue									19,987,000		21,174,000		22,905,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | South Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									30,201,000		30,509,000		30,415,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									119,819,000		138,172,000		141,041,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Tampa [Member]
Revenue from External Customer [Line Items]
Operating revenue									28,274,000		27,899,000		29,043,000
Office Building [Member] | North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									47,341,000	[1]	99,047,000	[1]	89,294,000	[1]
Office Building [Member] | UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									$3,270,000		$3,464,000		$3,383,000
[1]	A substantial portion of the buildings contributing to office operating revenue in 2012 and 2013 were sold in conjunction with the Portfolio Sale. See Footnote 19.

Segment_Information_Total_Asse

Segment Information - Total Assets by Segment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets	$6,625,536,000	$6,775,560,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	6,519,578,000	6,542,540,000
Operating Segments [Member] | Carolinas [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	325,690,000	257,230,000
Operating Segments [Member] | Chicago Milwaukee [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	422,531,000	413,585,000
Operating Segments [Member] | Houston [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	418,154,000	380,248,000
Operating Segments [Member] | Lehigh Central PA [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	1,023,641,000	938,824,000
Operating Segments [Member] | Minnesota [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	333,506,000	335,613,000
Operating Segments [Member] | Orlando [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	160,899,000	253,888,000
Operating Segments [Member] | Philadelphia [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	366,577,000	316,810,000
Operating Segments [Member] | Richmond Hampton Roads [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	250,205,000	250,008,000
Operating Segments [Member] | South Florida [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	400,034,000	380,138,000
Operating Segments [Member] | Southeastern PA [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	698,163,000	695,966,000
Operating Segments [Member] | Tampa [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	335,652,000	337,301,000
Operating Segments [Member] | United Kingdom [Member] | UNITED KINGDOM
Segment Reporting Information [Line Items]
Assets	231,276,000	247,537,000
Operating Segments [Member] | Other Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	1,553,250,000	1,735,392,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Assets	$105,958,000	$233,020,000

Segment_Information_Real_Estat

Segment Information - Real Estate Assets by Segment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]
Real estate assets	$5,897,569	$5,658,248
North America [Member] | Operating Segments [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Real estate assets	309,822	245,938
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Real estate assets	383,494	371,149
North America [Member] | Operating Segments [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Real estate assets	398,080	360,779
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Real estate assets	958,886	877,969
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Real estate assets	307,970	308,272
North America [Member] | Operating Segments [Member] | Orlando [Member]
Segment Reporting Information [Line Items]
Real estate assets	139,218	228,182
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Real estate assets	255,313	229,769
North America [Member] | Operating Segments [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Real estate assets	238,670	238,129
North America [Member] | Operating Segments [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Real estate assets	378,398	358,492
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Real estate assets	636,280	630,460
North America [Member] | Operating Segments [Member] | Tampa [Member]
Segment Reporting Information [Line Items]
Real estate assets	317,106	320,495
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Real estate assets	1,391,744	1,300,915
UNITED KINGDOM | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Real estate assets	$182,588	$187,699

Segment_Information_Costs_Incu

Segment Information - Costs Incurred on Long-lived Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$615,487	$1,895,449	$512,017
Operating Segments [Member] | North America [Member] | Carolinas [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	72,252	15,582	26,860
Operating Segments [Member] | North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	21,698	248,640	49,941
Operating Segments [Member] | North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	70,903	116,024	46,003
Operating Segments [Member] | North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	105,725	161,925	86,245
Operating Segments [Member] | North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	28,966	38,434	41,821
Operating Segments [Member] | North America [Member] | Orlando [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	7,827	10,953	10,122
Operating Segments [Member] | North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	32,012	17,941	93,673
Operating Segments [Member] | North America [Member] | Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	10,348	15,880	8,612
Operating Segments [Member] | North America [Member] | South Florida [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	30,063	148,165	3,337
Operating Segments [Member] | North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	39,638	39,590	11,577
Operating Segments [Member] | North America [Member] | Tampa [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	7,262	28,655	74,304
Operating Segments [Member] | North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	172,495	897,831	53,412
Operating Segments [Member] | UNITED KINGDOM | United Kingdom [Member]
Segment Reporting Information [Line Items]
Segments, Cost incurred on Long-lived Assets	$16,298	$155,829	$6,110

Accounting_for_the_Impairment_3

Accounting for the Impairment or Disposal of Long-Lived Assets - Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2013	Jan. 31, 2014
												sqft
												properties
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Gain on property dispositions									$46,631,000	$95,384,000	$12,426,000
Income from discontinued operations	306,000	133,000	296,000	47,846,000	51,832,000	6,544,000	13,633,000	49,830,000	48,581,000	121,839,000	51,004,000
Discontinued Operations [Member]
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Revenues									4,728,000	113,586,000	137,476,000
Operating expenses									-2,258,000	-41,875,000	-48,956,000
Interest and other income									37,000	213,000	580,000
Interest expense									-557,000	-15,903,000	-19,783,000
Depreciation and amortization									0	-29,566,000	-30,739,000
Income before property dispositions									1,950,000	26,455,000	38,578,000
Gain on property dispositions									46,631,000	95,384,000	12,426,000
Income from discontinued operations									48,581,000	121,839,000	51,004,000
Other Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties	1								1
Square Footage of Real Estate Property	83,000								83,000
Portfolio Sale, Total [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties												97
Square Footage of Real Estate Property												6,600,000
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds												697,300,000
Number of Real Estate Settlements					2					2
Area of Land					159					159
Portfolio Sale, first settlement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties					49					49
Square Footage of Real Estate Property					4,000,000					4,000,000
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds					367,700,000					367,700,000
Area of Land					140					140
Portfolio Sale, Second Settlement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds													329,600,000
Portfolio Sale, Second Settlement [Member] | Other Segments [Member] | Maryland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties													23
Square Footage of Real Estate Property													1,400,000
Area of Land													19
Portfolio Sale, Second Settlement [Member] | Other Segments [Member] | New Jersey [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties													24
Square Footage of Real Estate Property													1,200,000
Portfolio Sale, Second Settlement [Member] | Southeastern PA [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties													1
Square Footage of Real Estate Property													37,000
Other Properties [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Property, Plant, and Equipment										$136,700,000	$228,500,000

Accounting_for_the_Impairment_4

Accounting for the Impairment or Disposal of Long-Lived Assets Accounting for the Impairment or Disposal of Long-Lived Assets - Assets Held for Sale (Details) (Other Segments [Member])	Dec. 31, 2014
	sqft
	bldg
Other Segments [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of Real Estate Properties	1
Square Footage of Real Estate Property	83,000

Accounting_for_the_Impairment_5

Accounting for the Impairment or Disposal of Long-Lived Assets - Asset Impairments in Reportable Segments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Asset Impairment Charges	$117,000	$1,904,000	$6,851,000
Tangible Asset Impairment Charges [Abstract]
Land Impairment		200,000
Impairment Losses Related to Real Estate Partnerships		800,000	4,600,000
Impairment of Real Estate	100,000	900,000	2,300,000
Carolinas [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	36,000
Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	514,000
Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	27,000
South Florida [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	-51,000	[1]
Southeastern PA [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	106,000		1,699,000
Tampa [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	248,000	0
United Kingdom [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	784,000	4,597,000
Other Segments [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	$11,000	$872,000	$29,000
[1]	Represents recovery of estimated sales costs on properties sold.

Business_Combination_Business_1

Business Combination Business Combination (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 08, 2013
												sqft
Business Combination, Costs Incurred or to be Incurred [Abstract]
Deferred financing costs	$38,445,000				$36,883,000				$38,445,000	$36,883,000
Proceeds from unsecured notes									0	448,646,000	700,000,000
Business Acquisition, Pro Forma Information [Abstract]
Operating revenue	203,685,000	198,356,000	192,960,000	197,630,000	192,427,000	155,349,000	151,026,000	147,128,000	792,631,000	645,930,000	560,279,000
Operating Income (Loss)									257,423,000	203,047,000	189,942,000
Senior Notes [Member] | 4.40% senior unsecured note [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Proceeds from unsecured notes										450,000,000
Common Stock [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Number of common shares issued									0	1,900,000	0
Common Shares Equity Offering [Member] | Common Stock [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Number of common shares issued										24,200,000
Cabot Industrial Value Fund III [Member]
Business Combination, Description [Abstract]
Name of Acquired Entity										Cabot Industrial Fund III Operating Partnership, L.P.
Percentage of Voting Interests Acquired												100.00%
Square Footage of Real Estate Property												23,000,000
Business Acquisition, Date of Acquisition [Abstract]
Date of Acquisition									8-Oct-13
Business Combination, Consideration Transferred [Abstract]
Total purchase price of acquisition												1,469,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Land and land improvements												247,393,000
Building and improvements												1,152,717,000
Operating real estate												1,400,110,000
Intangible - in-place leases/market rent												97,396,000
Other assets												4,953,000
Total assets												1,502,459,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Mortgage loans					243,200,000					243,200,000		243,230,000
Other liabilities												32,958,000
Intangible market rent												5,737,000
Total liabilities												281,925,000
Net assets acquired												1,220,534,000
Business Combination, Costs Incurred or to be Incurred [Abstract]
Acquisition costs										7,600,000
Financing fees										4,200,000
Deferred financing costs					2,000,000					2,000,000
Mortgage loans acquired before fair value adjustment					229,800,000					229,800,000
Stock issuance costs										35,300,000
Business Acquisition, Pro Forma Information [Abstract]
Total operating revenue										750,896,000	692,583,000
Net income available to common shareholders										211,601,000	134,295,000
Operating revenue										31,400,000
Operating Income (Loss)										22,000,000
Cabot Industrial Value Fund III [Member] | Mortgages [Member]
Business Combination, Consideration Transferred [Abstract]
Assumption of mortgage debt from acquisition												229,800,000
Cabot Industrial Value Fund III [Member] | Senior Notes [Member] | 4.40% senior unsecured note [Member]
Business Combination, Costs Incurred or to be Incurred [Abstract]
Deferred financing costs					$3,900,000					$3,900,000
Cabot Industrial Value Fund III [Member] | Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Abstract]
Weighted average useful life of acquired of in-place lease intangible assets										4 years 5 months 0 days
Industrial Property [Member] | Cabot Industrial Value Fund III [Member]
Business Combination, Description [Abstract]
Number of Real Estate Properties												177

Derivative_Instruments_Derivat

Derivative Instruments Derivative Instruments (Details) (USD $)	1 Months Ended		12 Months Ended
	Dec. 31, 2013	Nov. 21, 2013	Dec. 31, 2014
Interest Rate Derivatives [Abstract]
Number of interest rate swaps			3
Aggregate notional amount	$105,200,000		$103,600,000
Change in fair value of interest rate swaps in earnings before cash flow hedge designation		813,000
Termination value of interest rate swap, including accrued interest			8,500,000
Interest Rate Cash Flow Hedges [Abstract]
Change in fair value of swaps in other comprehensive income	-1,600,000		3,400,000
Loss Reclassified from Accumulated OCI into Income			1,500,000
Loss on Interest Rate Cash Flow Hedge Ineffectiveness	-266,000		82,000
Fair value of swaps in other liabilities	8,400,000		8,500,000
Amount to be reclassified from accumulated other comprehensive income to increase interest expense over next twelve months			$1,200,000

Supplemental_Disclosure_to_Sta2

Supplemental Disclosure to Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Disclosure to Statements of Cash Flows [Abstract]
Write-off of fully depreciated property and deferred costs	$38,131	$22,269	$31,069
Write-off of depreciated property and deferred costs due to sale	173,083	202,695	106,698
Write-off of preferred units costs due to redemption	0	1,214	2,806
Assumption of mortgage loans in connection with the acquisition of properties	0	229,751	12,537
Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity	-11,948	0	0
Changes in accrued development capital expenditures	6,264	17,053	2,297
Unrealized (loss) gain on cash flow hedge	($3,419)	$1,584	$0

Schedule_II_Details

Schedule II (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	$7,761	$7,014	$7,453
Additions	4,983	3,320	2,812
Deductions	-5,344	-2,573	-3,251
Balance at End of the Year	7,400	7,761	7,014
Allowance for Trade Receivable, Straight Line Rent [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	823	798	1,311
Additions	1,097	815	350
Deductions	-1,010	-790	-863
Balance at End of the Year	910	823	798
Allowance for Trade Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	6,938	6,216	6,142
Additions	3,886	2,505	2,462
Deductions	-4,334	-1,783	-2,388
Balance at End of the Year	$6,490	$6,938	$6,216

Schedule_III_Details

Schedule III (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,080,138,000		6,709,841,000	5,375,440,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,182,569,000		1,051,593,000	1,067,272,000
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,709,841,000		5,375,440,000	4,873,875,000
Real Estate Additions	602,586,000		1,888,229,000	505,602,000
Real Estate, Cost of Real Estate Sold	-232,289,000		-553,828,000	-4,037,000
Real Estate, Gross	7,080,138,000		6,709,841,000	5,375,440,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,051,593,000		1,067,272,000	953,573,000
Real Estate Accumulated Depreciation, Depreciation Expense	179,143,000		162,546,000	140,570,000
Real Estate Accumulated Depreciation, Real Estate Sold	-48,167,000		-178,225,000	-26,871,000
Real Estate Accumulated Depreciation	1,182,569,000		1,051,593,000	1,067,272,000
Total Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	424,200,000
Total Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	60,746,274
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,413,189,571
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,838,135,653
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,817,731,432
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,458,817,640
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,621,318,481
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,080,136,121
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,182,568,534
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,080,136,121
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,182,568,534
Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	60,746,274
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,121,456,221
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,838,135,653
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,574,074,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,189,759,562
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,343,907,106
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,533,666,668
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,182,568,534
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,533,666,668
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,182,568,534
Operating Properties [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Aberdeen, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	12,052,635
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	35,325,281
Real Estate and Accumulated Depreciation, Carrying Amount of Land	12,334,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	35,043,886
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	47,377,916
Real Estate and Accumulated Depreciation, Accumulated Depreciation	422,091
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	47,377,916
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	422,091
Operating Properties [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Aberdeen, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,813,324
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,874,059
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,355,385
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,816,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,225,929
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	30,042,768
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,166,945
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	30,042,768
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,166,945
Operating Properties [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Addison, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,194,223
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,201,881
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	81,639
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,194,223
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,283,521
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,477,744
Real Estate and Accumulated Depreciation, Accumulated Depreciation	163,088
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,477,744
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	163,088
Operating Properties [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Addison, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,055,066
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,984,093
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	331,843
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,055,066
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,315,936
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,371,002
Real Estate and Accumulated Depreciation, Accumulated Depreciation	243,610
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,371,002
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	243,610
Operating Properties [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,722,683
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,922,645
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	620,045
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,722,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,542,690
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,265,373
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,189,398
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,265,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,189,398
Operating Properties [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,599,936
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,099,145
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,149,322
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,717,733
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,130,670
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,848,403
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,208,971
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,848,403
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,208,971
Operating Properties [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,065,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	27,612,516
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,184,096
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,493,920
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	35,678,016
Real Estate and Accumulated Depreciation, Accumulated Depreciation	13,473,371
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	35,678,016
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	13,473,371
Operating Properties [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,208,248
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	31,999,219
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,961,788
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,245,679
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	37,207,467
Real Estate and Accumulated Depreciation, Accumulated Depreciation	8,276,803
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	37,207,467
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	8,276,803
Operating Properties [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,308,646
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,689,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,308,646
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,689,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,998,488
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,349,337
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	21,998,488
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,349,337
Operating Properties [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,473,120
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	20,186,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,174,970
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,484,470
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,659,440
Real Estate and Accumulated Depreciation, Accumulated Depreciation	9,474,166
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,659,440
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	9,474,166
Operating Properties [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,594,027
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	28,536,883
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,596,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	28,534,143
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	39,130,910
Real Estate and Accumulated Depreciation, Accumulated Depreciation	10,949,295
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	39,130,910
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	10,949,295
Operating Properties [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	792,999
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,594,584
Real Estate and Accumulated Depreciation, Carrying Amount of Land	804,848
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,582,735
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,387,583
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,735,546
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,387,583
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,735,546
Operating Properties [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,670,849
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,307,408
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,536,663
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,670,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,844,247
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,514,920
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,872,299
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,514,920
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,872,299
Operating Properties [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,187,776
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,592,257
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,197,447
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,582,586
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,780,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,389,185
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,780,033
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,389,185
Operating Properties [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	717,488
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,022,413
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,376,237
Real Estate and Accumulated Depreciation, Carrying Amount of Land	726,651
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,389,486
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,116,137
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,726,618
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1976
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,116,137
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,726,618
Operating Properties [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,019,258
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,900,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,645,117
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,274,664
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,919,781
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,646,042
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,919,781
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,646,042
Operating Properties [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,564,167
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,919,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,571,466
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,912,668
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,484,134
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,887,452
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,484,134
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,887,452
Operating Properties [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,025,667
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,010,938
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,035,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,000,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,036,605
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,557,249
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,036,605
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,557,249
Operating Properties [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,725,948
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	27,161,555
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,521,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	26,366,292
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	33,887,503
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,109,054
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	33,887,503
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,109,054
Operating Properties [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	531,268
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,572,086
Real Estate and Accumulated Depreciation, Carrying Amount of Land	532,047
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,571,307
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,103,354
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,457,545
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,103,354
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,457,545
Operating Properties [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	360,027
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,028,297
Real Estate and Accumulated Depreciation, Carrying Amount of Land	560,691
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,827,633
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,388,324
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,275,548
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,388,324
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,275,548
Operating Properties [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	540,795
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,959,133
Real Estate and Accumulated Depreciation, Carrying Amount of Land	541,459
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,958,469
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,499,928
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,151,166
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,499,928
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,151,166
Operating Properties [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	707,203
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,000,621
Real Estate and Accumulated Depreciation, Carrying Amount of Land	707,867
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,999,957
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,707,824
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,725,562
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,707,824
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,725,562
Operating Properties [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	453,315
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,712,509
Real Estate and Accumulated Depreciation, Carrying Amount of Land	484,361
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,681,463
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,165,824
Real Estate and Accumulated Depreciation, Accumulated Depreciation	944,248
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,165,824
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	944,248
Operating Properties [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	422,042
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,012,192
Real Estate and Accumulated Depreciation, Carrying Amount of Land	422,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,011,504
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,434,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,648,926
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,434,234
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,648,926
Operating Properties [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	458,281
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,805,111
Real Estate and Accumulated Depreciation, Carrying Amount of Land	458,945
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,804,447
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,263,392
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,906,340
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,263,392
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,906,340
Operating Properties [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	388,328
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,782,863
Real Estate and Accumulated Depreciation, Carrying Amount of Land	389,081
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,782,110
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,171,191
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,636,788
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,171,191
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,636,788
Operating Properties [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Allentown, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,091,806
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,851,456
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	258,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,093,724
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,107,678
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,201,402
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,031,249
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,201,402
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,031,249
Operating Properties [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Atlanta, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	200,351
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,729,161
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	197,738
Real Estate and Accumulated Depreciation, Carrying Amount of Land	200,351
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,926,899
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,127,250
Real Estate and Accumulated Depreciation, Accumulated Depreciation	78,787
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,127,250
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	78,787
Operating Properties [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Atlanta, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	188,680
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,721,048
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	83,383
Real Estate and Accumulated Depreciation, Carrying Amount of Land	188,680
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,804,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,993,111
Real Estate and Accumulated Depreciation, Accumulated Depreciation	88,681
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,993,111
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	88,681
Operating Properties [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Atlanta, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	919,850
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,051,340
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	620,926
Real Estate and Accumulated Depreciation, Carrying Amount of Land	919,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,672,266
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,592,116
Real Estate and Accumulated Depreciation, Accumulated Depreciation	228,707
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,592,116
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	228,707
Operating Properties [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Barton Under Needwood, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,196,955
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,643,981
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-935,703
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,067,184
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,838,049
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,905,233
Real Estate and Accumulated Depreciation, Accumulated Depreciation	461,655
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,905,233
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	461,655
Operating Properties [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Batavia, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	727,294
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,367,529
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	158,908
Real Estate and Accumulated Depreciation, Carrying Amount of Land	727,294
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,526,437
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,253,731
Real Estate and Accumulated Depreciation, Accumulated Depreciation	119,118
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,253,731
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	119,118
Operating Properties [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Belcamp, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	299,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,818,861
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	712,788
Real Estate and Accumulated Depreciation, Carrying Amount of Land	299,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,531,649
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,831,249
Real Estate and Accumulated Depreciation, Accumulated Depreciation	977,674
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,831,249
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	977,674
Operating Properties [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,769,962
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,829,028
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	232,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,769,962
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,061,270
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,831,232
Real Estate and Accumulated Depreciation, Accumulated Depreciation	111,856
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,831,232
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	111,856
Operating Properties [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,595,044
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,415,132
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	272,977
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,595,044
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,688,109
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,283,153
Real Estate and Accumulated Depreciation, Accumulated Depreciation	180,373
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,283,153
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	180,373
Operating Properties [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,492,036
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,024,038
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	447,214
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,492,036
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,471,252
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,963,288
Real Estate and Accumulated Depreciation, Accumulated Depreciation	184,955
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,963,288
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	184,955
Operating Properties [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,021,752
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,503,802
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	391,474
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,021,752
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,895,276
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,917,028
Real Estate and Accumulated Depreciation, Accumulated Depreciation	212,784
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,917,028
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	212,784
Operating Properties [Member] | 12140 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,196,726
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,949,555
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	118,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,196,726
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,068,424
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,265,150
Real Estate and Accumulated Depreciation, Accumulated Depreciation	89,485
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,265,150
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	89,485
Operating Properties [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,347,882
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,460,291
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	216,607
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,347,882
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,676,898
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,024,780
Real Estate and Accumulated Depreciation, Accumulated Depreciation	71,156
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,024,780
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	71,156
Operating Properties [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Beltsville,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,479,307
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,159,997
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	253,923
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,479,307
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,413,921
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,893,228
Real Estate and Accumulated Depreciation, Accumulated Depreciation	101,243
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,893,228
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	101,243
Operating Properties [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bensenville,IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,173,006
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,280,788
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	234,091
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,173,006
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,514,879
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,687,885
Real Estate and Accumulated Depreciation, Accumulated Depreciation	154,631
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,687,885
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	154,631
Operating Properties [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bensenville,IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,298,560
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,020,382
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	358,604
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,298,560
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,378,986
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,677,546
Real Estate and Accumulated Depreciation, Accumulated Depreciation	229,722
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,677,546
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	229,722
Operating Properties [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bensenville,IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,903,423
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,563,953
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	300,151
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,903,423
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,864,104
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,767,527
Real Estate and Accumulated Depreciation, Accumulated Depreciation	199,086
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,767,527
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	199,086
Operating Properties [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bensenville,IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,958,756
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,959,013
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	564,918
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,958,756
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,523,931
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,482,687
Real Estate and Accumulated Depreciation, Accumulated Depreciation	402,589
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,482,687
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	402,589
Operating Properties [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bethlehem, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,591,216
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	32,941,818
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,354,111
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,945,327
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	32,941,818
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	41,887,145
Real Estate and Accumulated Depreciation, Accumulated Depreciation	34,885
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	41,887,145
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	34,885
Operating Properties [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bethlehem, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	11,961,623
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	46,473,202
Real Estate and Accumulated Depreciation, Carrying Amount of Land	12,009,985
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	46,424,840
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	58,434,825
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,713,528
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	58,434,825
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,713,528
Operating Properties [Member] | 74 West Broad Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bethlehem, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,096,127
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,432,830
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,099,079
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,429,878
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,528,957
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,235,792
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,528,957
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,235,792
Operating Properties [Member] | 10801 Nesbitt Avenue South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	784,577
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,010,219
Real Estate and Accumulated Depreciation, Carrying Amount of Land	786,382
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,008,414
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,794,796
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,620,711
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,794,796
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,620,711
Operating Properties [Member] | 5705 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,113,223
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,052,334
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,148,571
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,016,986
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,165,557
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,886,077
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,165,557
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,886,077
Operating Properties [Member] | 5715 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,263,226
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,360,782
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,310,183
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,264,758
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,669,433
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,934,191
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,697,547
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,934,191
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,697,547
Operating Properties [Member] | 5735 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,263,226
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,360,782
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,090,289
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,264,758
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,449,539
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,714,297
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,001,168
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,714,297
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,001,168
Operating Properties [Member] | 5775 West Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,052,018
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,849,649
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,670,618
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,060,644
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,511,641
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,572,285
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,087,327
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,572,285
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,087,327
Operating Properties [Member] | 6161 Green Valley Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	740,378
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,311,602
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,680,574
Real Estate and Accumulated Depreciation, Carrying Amount of Land	709,961
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,022,593
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,732,554
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,088,791
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1992
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,732,554
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,088,791
Operating Properties [Member] | 6601-6625 W. 78th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bloomington, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,263,060
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	41,737,014
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,310,246
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	41,689,828
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	44,000,074
Real Estate and Accumulated Depreciation, Accumulated Depreciation	16,555,948
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	44,000,074
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	16,555,948
Operating Properties [Member] | 750 Park of Commerce Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Boca Raton, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,430,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	22,129,358
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,473,406
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,085,952
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,559,358
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,353,261
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,559,358
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,353,261
Operating Properties [Member] | 777 Yamato Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Boca Raton, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,101,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,077,347
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,792,033
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,501,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,469,380
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,970,627
Real Estate and Accumulated Depreciation, Accumulated Depreciation	9,450,754
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,970,627
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	9,450,754
Operating Properties [Member] | 951 Broken Sound Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Boca Raton, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,426,251
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,098,952
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,990,222
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,426,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,089,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,515,425
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,683,396
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,515,425
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,683,396
Operating Properties [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bolingbrook, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,501,294
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,704,719
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,501,294
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,704,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,206,013
Real Estate and Accumulated Depreciation, Accumulated Depreciation	589,578
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,206,013
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	589,578
Operating Properties [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bolingbrook, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,078,949
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,143,377
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	845,243
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,078,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,988,620
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	18,067,569
Real Estate and Accumulated Depreciation, Accumulated Depreciation	681,812
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	18,067,569
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	681,812
Operating Properties [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bolingbrook, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,764,831
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,109,947
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,016,526
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,764,831
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,126,473
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	19,891,304
Real Estate and Accumulated Depreciation, Accumulated Depreciation	830,092
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	19,891,304
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	830,092
Operating Properties [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Breinigsville, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,859,106
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,599,615
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,865,575
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,593,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,458,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,810,834
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,458,721
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,810,834
Operating Properties [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Breinigsville, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,089,719
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,353,910
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,222,168
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,221,461
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,443,629
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,836,038
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,443,629
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,836,038
Operating Properties [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Breinigsville, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,752,708
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	39,845,367
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,511,499
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	37,086,576
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	48,598,075
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,869,714
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	48,598,075
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,869,714
Operating Properties [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Breinigsville, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,118,881
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,885,486
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,400,855
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,118,881
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	26,286,341
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	34,405,222
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,806,275
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	34,405,222
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,806,275
Operating Properties [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carlisle, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,249,868
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,886,039
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,314,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,095,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,354,708
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,449,970
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,401,702
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,449,970
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,401,702
Operating Properties [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carlisle, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	7,981,850
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	32,774,046
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,081,272
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	32,674,624
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	40,755,896
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,837,960
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	40,755,896
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,837,960
Operating Properties [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carol Stream, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,873,094
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,430,320
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	661,228
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,873,094
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,091,548
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,964,642
Real Estate and Accumulated Depreciation, Accumulated Depreciation	418,477
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,964,642
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	418,477
Operating Properties [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carol Stream, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,523,427
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,581,705
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	202,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,523,427
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,784,382
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,307,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation	495,025
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,307,809
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	495,025
Operating Properties [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carrollton, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	247,477
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,028,322
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	83,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land	247,477
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,111,845
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,359,322
Real Estate and Accumulated Depreciation, Accumulated Depreciation	97,622
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,359,322
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	97,622
Operating Properties [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Carrollton, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,042,453
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,027,974
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	401,254
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,042,453
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,429,228
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,471,681
Real Estate and Accumulated Depreciation, Accumulated Depreciation	360,866
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,471,681
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	360,866
Operating Properties [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chambersburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	7,081,007
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	39,002,011
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,091,556
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,081,007
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	41,093,567
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	48,174,574
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,805,946
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	48,174,574
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,805,946
Operating Properties [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chambersburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,695,501
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	34,926,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,407,871
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	34,214,219
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	43,622,090
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,767,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	43,622,090
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,767,870
Operating Properties [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Champlain, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,251,043
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,662,995
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	119,919
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,251,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,782,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,033,957
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,144,351
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,033,957
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,144,351
Operating Properties [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,054,621
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,356,151
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	631,251
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,054,621
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,987,401
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,042,022
Real Estate and Accumulated Depreciation, Accumulated Depreciation	580,952
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,042,022
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	580,952
Operating Properties [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	475,368
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,367,586
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	706,208
Real Estate and Accumulated Depreciation, Carrying Amount of Land	476,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,072,899
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,549,161
Real Estate and Accumulated Depreciation, Accumulated Depreciation	294,635
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,549,161
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	294,635
Operating Properties [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	912,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,721,259
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	293,785
Real Estate and Accumulated Depreciation, Carrying Amount of Land	912,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,015,044
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,927,544
Real Estate and Accumulated Depreciation, Accumulated Depreciation	460,922
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,927,544
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	460,922
Operating Properties [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,275,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,649,750
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	651,875
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,275,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,301,625
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,576,625
Real Estate and Accumulated Depreciation, Accumulated Depreciation	495,724
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,576,625
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	495,724
Operating Properties [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,878,750
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,129,499
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	30,657
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,878,750
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,160,156
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,038,906
Real Estate and Accumulated Depreciation, Accumulated Depreciation	885,076
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,038,906
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	885,076
Operating Properties [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,065,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,975,250
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	211,801
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,065,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,187,051
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,252,051
Real Estate and Accumulated Depreciation, Accumulated Depreciation	656,037
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,252,051
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	656,037
Operating Properties [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,831,250
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,779,412
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	179,996
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,831,250
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,959,408
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,790,658
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,026,986
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,790,658
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,026,986
Operating Properties [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,990,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,561,540
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	442,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,990,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,004,217
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,994,217
Real Estate and Accumulated Depreciation, Accumulated Depreciation	648,233
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,994,217
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	648,233
Operating Properties [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,418,928
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,511,050
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,510
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,418,928
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,519,560
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,938,488
Real Estate and Accumulated Depreciation, Accumulated Depreciation	790,434
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,938,488
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	790,434
Operating Properties [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,279,004
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,396,981
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,279,004
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,396,981
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,675,985
Real Estate and Accumulated Depreciation, Accumulated Depreciation	490,797
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,675,985
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	490,797
Operating Properties [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	841,250
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,279,315
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	313,661
Real Estate and Accumulated Depreciation, Carrying Amount of Land	837,144
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,597,082
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,434,226
Real Estate and Accumulated Depreciation, Accumulated Depreciation	492,662
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,434,226
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	492,662
Operating Properties [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	4,055,621
Real Estate and Accumulated Depreciation, Initial Cost of Land	690,750
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,086,388
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	182,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land	690,750
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,268,429
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,959,179
Real Estate and Accumulated Depreciation, Accumulated Depreciation	465,537
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,959,179
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	465,537
Operating Properties [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	4,011,687
Real Estate and Accumulated Depreciation, Initial Cost of Land	603,003
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,969,011
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	31,500
Real Estate and Accumulated Depreciation, Carrying Amount of Land	603,003
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,000,511
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,603,514
Real Estate and Accumulated Depreciation, Accumulated Depreciation	392,055
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,603,514
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	392,055
Operating Properties [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	3,521,593
Real Estate and Accumulated Depreciation, Initial Cost of Land	509,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,710,218
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	193,375
Real Estate and Accumulated Depreciation, Carrying Amount of Land	613,962
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,798,878
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,412,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation	306,891
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,412,840
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	306,891
Operating Properties [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,027,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,172,807
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	20,992
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,027,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,193,799
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,221,299
Real Estate and Accumulated Depreciation, Accumulated Depreciation	41,665
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,221,299
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	41,665
Operating Properties [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	527,873
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,959,206
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	51,226
Real Estate and Accumulated Depreciation, Carrying Amount of Land	527,873
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,010,432
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,538,305
Real Estate and Accumulated Depreciation, Accumulated Depreciation	440,808
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,538,305
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	440,808
Operating Properties [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	557,730
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,785,333
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	345,123
Real Estate and Accumulated Depreciation, Carrying Amount of Land	557,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,130,456
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,688,186
Real Estate and Accumulated Depreciation, Accumulated Depreciation	537,610
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,688,186
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	537,610
Operating Properties [Member] | 1301 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	997,570
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,090,852
Real Estate and Accumulated Depreciation, Carrying Amount of Land	970,151
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,118,271
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,088,422
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,070,574
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,088,422
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,070,574
Operating Properties [Member] | 1305 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	861,020
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,317,649
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,129,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,048,819
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,178,669
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,470,458
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,178,669
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,470,458
Operating Properties [Member] | 1309 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	926,125
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,098,066
Real Estate and Accumulated Depreciation, Carrying Amount of Land	955,374
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,068,817
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,024,191
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,755,796
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,024,191
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,755,796
Operating Properties [Member] | 1313 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,180,036
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,146,319
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,708,050
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,618,305
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,326,355
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,661,772
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,326,355
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,661,772
Operating Properties [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,711,746
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,418,032
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	433,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,711,746
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,851,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,562,920
Real Estate and Accumulated Depreciation, Accumulated Depreciation	488,122
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,562,920
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	488,122
Operating Properties [Member] | 500 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	864,150
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,427,285
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	660,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land	866,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,085,068
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,951,677
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,647,398
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,951,677
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,647,398
Operating Properties [Member] | 501 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,202,556
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,975,538
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,588,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,292,273
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,474,566
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,766,839
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,047,049
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,766,839
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,047,049
Operating Properties [Member] | 505 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,292,062
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,456,515
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,413,739
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,292,254
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,870,061
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,162,315
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,014,499
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,162,315
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,014,499
Operating Properties [Member] | 510 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,012,149
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,546,882
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,015,278
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,014,689
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,559,621
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,574,310
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,462,068
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,574,310
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,462,068
Operating Properties [Member] | 676 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,527,303
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,380,921
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,562,903
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,345,321
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,908,224
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,668,090
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,908,224
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,668,090
Operating Properties [Member] | 700 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Chesapeake, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,950,375
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,236,994
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	663,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,951,135
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,899,408
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,850,543
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,560,770
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,850,543
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,560,770
Operating Properties [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Cicero, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,540,236
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,130,552
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	927,655
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,540,236
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	21,058,207
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,598,443
Real Estate and Accumulated Depreciation, Accumulated Depreciation	872,113
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,598,443
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	872,113
Operating Properties [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Cinncinnati, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,030,242
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,003,024
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	150,831
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,030,242
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,153,854
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,184,096
Real Estate and Accumulated Depreciation, Accumulated Depreciation	191,841
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,184,096
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	191,841
Operating Properties [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Cinncinnati, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,138,166
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,914,789
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	197,670
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,138,166
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,112,459
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,250,625
Real Estate and Accumulated Depreciation, Accumulated Depreciation	305,507
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,250,625
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	305,507
Operating Properties [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Columbia, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,915,960
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,461,228
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	320,391
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,915,960
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,781,619
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,697,579
Real Estate and Accumulated Depreciation, Accumulated Depreciation	318,937
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,697,579
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	318,937
Operating Properties [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Columbus, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	540,601
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,129,342
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	169,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land	540,601
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,298,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,839,275
Real Estate and Accumulated Depreciation, Accumulated Depreciation	220,056
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,839,275
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	220,056
Operating Properties [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Columbus, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	549,393
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,643,302
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	181,695
Real Estate and Accumulated Depreciation, Carrying Amount of Land	549,393
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,824,997
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,374,390
Real Estate and Accumulated Depreciation, Accumulated Depreciation	223,841
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,374,390
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	223,841
Operating Properties [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Coppell, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	312,701
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,311,531
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	742,190
Real Estate and Accumulated Depreciation, Carrying Amount of Land	312,701
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,053,721
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,366,422
Real Estate and Accumulated Depreciation, Accumulated Depreciation	202,145
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,366,422
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	202,145
Operating Properties [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Crofton, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,172,032
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,350,782
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	418,907
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,172,032
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,769,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,941,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation	345,403
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,941,721
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	345,403
Operating Properties [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Dayton, NJ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,039,559
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,863,051
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,217,455
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,039,559
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,080,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	27,120,065
Real Estate and Accumulated Depreciation, Accumulated Depreciation	895,237
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	27,120,065
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	895,237
Operating Properties [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Deer Park, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	829,570
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,778,327
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	47,399
Real Estate and Accumulated Depreciation, Carrying Amount of Land	831,611
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,823,685
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,655,296
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,053,460
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,655,296
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,053,460
Operating Properties [Member] | 301-321 S Goolsby Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Deerfield Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	498,136
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,781,180
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	162,422
Real Estate and Accumulated Depreciation, Carrying Amount of Land	498,136
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,943,602
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,441,738
Real Estate and Accumulated Depreciation, Accumulated Depreciation	105,281
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,441,738
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	105,281
Operating Properties [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duluth, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,928,412
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,651,819
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	569,167
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,928,412
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,220,986
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,149,398
Real Estate and Accumulated Depreciation, Accumulated Depreciation	331,184
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,149,398
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	331,184
Operating Properties [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duluth, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,082,072
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,496,599
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	444,944
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,082,072
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,941,543
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,023,615
Real Estate and Accumulated Depreciation, Accumulated Depreciation	166,657
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,023,615
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	166,657
Operating Properties [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duluth, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,676,415
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,567,592
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	637,896
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,676,415
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,205,489
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,881,904
Real Estate and Accumulated Depreciation, Accumulated Depreciation	301,450
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,881,904
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	301,450
Operating Properties [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duncan, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	598,348
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,643,756
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	205,725
Real Estate and Accumulated Depreciation, Carrying Amount of Land	598,918
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,848,911
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,447,829
Real Estate and Accumulated Depreciation, Accumulated Depreciation	971,351
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,447,829
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	971,351
Operating Properties [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duncan, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	551,663
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,310,993
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	249,227
Real Estate and Accumulated Depreciation, Carrying Amount of Land	552,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,559,671
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,111,882
Real Estate and Accumulated Depreciation, Accumulated Depreciation	773,710
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,111,882
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	773,710
Operating Properties [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duncan, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	901,444
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,751,389
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	190,639
Real Estate and Accumulated Depreciation, Carrying Amount of Land	902,374
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,941,098
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,843,472
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,591,923
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,843,472
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,591,923
Operating Properties [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Duncan, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	975,433
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,851,990
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	358,457
Real Estate and Accumulated Depreciation, Carrying Amount of Land	976,393
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,209,487
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,185,880
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,389,150
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,185,880
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,389,150
Operating Properties [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,229,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,064,506
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-6,132
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,229,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,058,374
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,287,374
Real Estate and Accumulated Depreciation, Accumulated Depreciation	141,180
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,287,374
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	141,180
Operating Properties [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,440,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,932,265
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	119,316
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,440,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,051,581
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,491,581
Real Estate and Accumulated Depreciation, Accumulated Depreciation	147,601
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,491,581
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	147,601
Operating Properties [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,624,030
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	20,889
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,500,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,644,918
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,144,918
Real Estate and Accumulated Depreciation, Accumulated Depreciation	94,358
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,144,918
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	94,358
Operating Properties [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,440,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,356,161
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-5,933
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,440,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,350,228
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,790,228
Real Estate and Accumulated Depreciation, Accumulated Depreciation	141,372
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,790,228
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	141,372
Operating Properties [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,576,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,240,961
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,576,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,240,961
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,817,461
Real Estate and Accumulated Depreciation, Accumulated Depreciation	75,792
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,817,461
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	75,792
Operating Properties [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eagan, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	988,594
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,586,907
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	988,594
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,586,907
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,575,501
Real Estate and Accumulated Depreciation, Accumulated Depreciation	538,170
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,575,501
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	538,170
Operating Properties [Member] | 3255 Neil Armstrong Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eagan, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,131,017
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,366,267
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,103,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,393,424
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,497,284
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,361,295
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,497,284
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,361,295
Operating Properties [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eagan, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	999,702
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,042,589
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	312,232
Real Estate and Accumulated Depreciation, Carrying Amount of Land	999,702
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,354,821
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,354,523
Real Estate and Accumulated Depreciation, Accumulated Depreciation	567,528
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,354,523
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	567,528
Operating Properties [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eagan, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,493,115
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,120,455
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	711,446
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,493,115
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,831,901
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,325,016
Real Estate and Accumulated Depreciation, Accumulated Depreciation	387,420
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,325,016
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	387,420
Operating Properties [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	120,622
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,085,226
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	209,456
Real Estate and Accumulated Depreciation, Carrying Amount of Land	118,300
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,297,004
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,415,304
Real Estate and Accumulated Depreciation, Accumulated Depreciation	540,055
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,415,304
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	540,055
Operating Properties [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	145,198
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,305,700
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	571,300
Real Estate and Accumulated Depreciation, Carrying Amount of Land	142,399
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,879,799
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,022,198
Real Estate and Accumulated Depreciation, Accumulated Depreciation	741,150
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,022,198
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	741,150
Operating Properties [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	110,746
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	995,868
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	395,071
Real Estate and Accumulated Depreciation, Carrying Amount of Land	108,610
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,393,075
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,501,685
Real Estate and Accumulated Depreciation, Accumulated Depreciation	686,758
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,501,685
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	686,758
Operating Properties [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	275,903
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,481,666
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	790,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land	270,584
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,277,730
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,548,314
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,473,755
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,548,314
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,473,755
Operating Properties [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	291,077
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,618,194
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	905,655
Real Estate and Accumulated Depreciation, Carrying Amount of Land	285,464
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,529,462
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,814,926
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,470,536
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,814,926
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,470,536
Operating Properties [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	269,618
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,423,318
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,397,727
Real Estate and Accumulated Depreciation, Carrying Amount of Land	264,419
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,826,244
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,090,663
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,356,626
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,090,663
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,356,626
Operating Properties [Member] | 10400 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,912,391
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	23,631,155
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,938,372
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,605,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,543,546
Real Estate and Accumulated Depreciation, Accumulated Depreciation	10,312,893
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,543,546
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	10,312,893
Operating Properties [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,232,831
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,855,851
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	53,338
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,243,977
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,898,042
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,142,019
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,135,275
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	21,142,019
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,135,275
Operating Properties [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	343,093
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,085,795
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,528,369
Real Estate and Accumulated Depreciation, Carrying Amount of Land	336,481
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,620,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,957,257
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,037,707
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,957,257
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,037,707
Operating Properties [Member] | 7615 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,011,517
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,042,963
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,000,555
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,053,925
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,054,480
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,509,222
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,054,480
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,509,222
Operating Properties [Member] | 7625 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,500,641
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,282,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,916,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,866,092
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,782,701
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,366,800
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,782,701
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,366,800
Operating Properties [Member] | 7695-7699 Anagram Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	760,525
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,254,758
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,171,692
Real Estate and Accumulated Depreciation, Carrying Amount of Land	760,525
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,426,450
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,186,975
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,103,041
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,186,975
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,103,041
Operating Properties [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	993,101
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,136,862
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,299,413
Real Estate and Accumulated Depreciation, Carrying Amount of Land	993,101
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,436,274
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,429,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,399,635
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,429,375
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,399,635
Operating Properties [Member] | 7800 Equitable Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,188,525
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,788,762
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	573,212
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,188,525
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,361,973
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,550,498
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,608,943
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1993
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,550,498
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,608,943
Operating Properties [Member] | 7905 Fuller Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,229,862
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,075,167
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,980,136
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,230,965
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,054,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,285,165
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,258,697
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1994
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,285,165
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,258,697
Operating Properties [Member] | 8855 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,400,925
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,199,574
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,599,757
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,000,742
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,600,499
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,322,395
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,600,499
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,322,395
Operating Properties [Member] | 8911 Columbine Road (B2) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	916,687
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,444,635
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,718,407
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,642,915
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,361,322
Real Estate and Accumulated Depreciation, Accumulated Depreciation	913,476
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,361,322
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	913,476
Operating Properties [Member] | 8937 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,325,829
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,872,477
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,739,966
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,458,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,198,306
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,468,530
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,198,306
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,468,530
Operating Properties [Member] | 8967 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,450,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,536,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,450,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,536,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,986,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,565,519
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,986,312
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,565,519
Operating Properties [Member] | 8995 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,087,594
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,610,464
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,055,296
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,642,762
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,698,058
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,122,150
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,698,058
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,122,150
Operating Properties [Member] | 9023 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Prairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,956,273
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,223,935
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,956,273
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,223,935
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,180,208
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,262,205
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,180,208
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,262,205
Operating Properties [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elk Grove, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,403,196
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,386,396
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	51,263
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,403,196
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,437,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,840,855
Real Estate and Accumulated Depreciation, Accumulated Depreciation	110,507
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,840,855
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	110,507
Operating Properties [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elkridge, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,680,220
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,671,910
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	395,304
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,680,220
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	15,067,214
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	18,747,434
Real Estate and Accumulated Depreciation, Accumulated Depreciation	564,896
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	18,747,434
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	564,896
Operating Properties [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elkridge, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,421,854
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,730,192
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	271,090
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,421,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,001,282
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,423,136
Real Estate and Accumulated Depreciation, Accumulated Depreciation	383,902
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,423,136
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	383,902
Operating Properties [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elkridge, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,897,044
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,287,620
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,023,417
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,161,247
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,184,664
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,466,278
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,184,664
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,466,278
Operating Properties [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elwood, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,594,259
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	30,329,802
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	892,439
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,594,259
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	31,222,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	41,816,501
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,850,990
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	41,816,501
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,850,990
Operating Properties [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Elwood, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,022,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,612,934
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	316,780
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,022,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,929,714
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,951,714
Real Estate and Accumulated Depreciation, Accumulated Depreciation	585,497
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,951,714
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	585,497
Operating Properties [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Erlanger, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,211,604
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	616,661
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,828,265
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,828,265
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,076,746
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,828,265
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,076,746
Operating Properties [Member] | 180 Sheree Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Exton, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,647,861
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,334,403
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,771,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,649,426
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,103,856
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,753,282
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,581,319
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,753,282
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,581,319
Operating Properties [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fairfield, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	412,136
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,029,177
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	74,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land	412,136
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,103,922
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,516,058
Real Estate and Accumulated Depreciation, Accumulated Depreciation	129,645
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,516,058
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	129,645
Operating Properties [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fairfield, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	367,925
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,205,817
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	79,892
Real Estate and Accumulated Depreciation, Carrying Amount of Land	367,925
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,285,709
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,653,634
Real Estate and Accumulated Depreciation, Accumulated Depreciation	105,435
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,653,634
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	105,435
Operating Properties [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Forest Park, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	756,221
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,115,626
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	499,723
Real Estate and Accumulated Depreciation, Carrying Amount of Land	756,221
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,615,349
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,371,570
Real Estate and Accumulated Depreciation, Accumulated Depreciation	426,230
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,371,570
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	426,230
Operating Properties [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fort Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	545,480
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,540,210
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	66,119
Real Estate and Accumulated Depreciation, Carrying Amount of Land	545,480
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,606,329
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,151,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation	98,750
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,151,809
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	98,750
Operating Properties [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fort Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,064,734
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	275,929
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,340,663
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,340,663
Real Estate and Accumulated Depreciation, Accumulated Depreciation	149,571
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,340,663
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	149,571
Operating Properties [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fort Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	519,984
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,677,465
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	51,998
Real Estate and Accumulated Depreciation, Carrying Amount of Land	519,984
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,729,463
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,249,447
Real Estate and Accumulated Depreciation, Accumulated Depreciation	109,792
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,249,447
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	109,792
Operating Properties [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fort Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,988,181
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	184,139
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,172,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,172,320
Real Estate and Accumulated Depreciation, Accumulated Depreciation	144,246
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,172,320
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	144,246
Operating Properties [Member] | 5400 Alliance Gateway Freeway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fort Worth, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,515,860
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,710,118
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	403,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,515,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,113,787
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,629,647
Real Estate and Accumulated Depreciation, Accumulated Depreciation	385,887
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,629,647
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	385,887
Operating Properties [Member] | 101 Constitution Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Franklin, MA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	532,339
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,206,412
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	362,342
Real Estate and Accumulated Depreciation, Carrying Amount of Land	532,339
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,568,754
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,101,093
Real Estate and Accumulated Depreciation, Accumulated Depreciation	289,771
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,101,093
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	289,771
Operating Properties [Member] | 20 Liberty Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Franklin, MA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	618,521
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,570,341
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	366,408
Real Estate and Accumulated Depreciation, Carrying Amount of Land	618,521
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,936,749
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,555,270
Real Estate and Accumulated Depreciation, Accumulated Depreciation	257,465
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,555,270
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	257,465
Operating Properties [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Fredericksburg, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	475,262
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,917,234
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	242,595
Real Estate and Accumulated Depreciation, Carrying Amount of Land	475,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,159,829
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,635,091
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,034,337
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,635,091
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,034,337
Operating Properties [Member] | 200 W Cypress Creek Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Ft. Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,414,989
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,399,738
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,526,679
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,414,989
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,926,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,341,406
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,514,829
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,341,406
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,514,829
Operating Properties [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Ft. Lauderdale, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	603,776
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,176,238
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,476,816
Real Estate and Accumulated Depreciation, Carrying Amount of Land	625,111
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,631,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,256,830
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,437,758
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,256,830
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,437,758
Operating Properties [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Garden Grove, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,048,143
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,088,697
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	70,518
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,048,143
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,159,215
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,207,358
Real Estate and Accumulated Depreciation, Accumulated Depreciation	91,839
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,207,358
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	91,839
Operating Properties [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Garden Grove, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,766,822
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,539,214
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	132,812
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,766,822
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,672,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,438,848
Real Estate and Accumulated Depreciation, Accumulated Depreciation	121,987
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,438,848
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	121,987
Operating Properties [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Garden Grove, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,221,102
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,225,596
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-1,521
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,220,148
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,225,029
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,445,177
Real Estate and Accumulated Depreciation, Accumulated Depreciation	56,969
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,445,177
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	56,969
Operating Properties [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Garland, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	799,707
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,122,065
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	402,188
Real Estate and Accumulated Depreciation, Carrying Amount of Land	799,707
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,524,253
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,323,960
Real Estate and Accumulated Depreciation, Accumulated Depreciation	263,880
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,323,960
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	263,880
Operating Properties [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Grand Prairie, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,785,741
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,158,818
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	988,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,785,741
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,147,067
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,932,808
Real Estate and Accumulated Depreciation, Accumulated Depreciation	668,776
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,932,808
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	668,776
Operating Properties [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Grapevine, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,165,780
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,799,270
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	420,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,165,780
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,219,529
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,385,309
Real Estate and Accumulated Depreciation, Accumulated Depreciation	384,152
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,385,309
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	384,152
Operating Properties [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenville, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,547,811
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,181,664
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,712,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,016,792
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,729,475
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,982,229
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,729,475
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,982,229
Operating Properties [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenville, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	288,823
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,441,512
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	28,405
Real Estate and Accumulated Depreciation, Carrying Amount of Land	288,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,469,917
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,758,740
Real Estate and Accumulated Depreciation, Accumulated Depreciation	126,648
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,758,740
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	126,648
Operating Properties [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenville, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	818,114
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,468,582
Real Estate and Accumulated Depreciation, Carrying Amount of Land	825,529
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,461,167
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,286,696
Real Estate and Accumulated Depreciation, Accumulated Depreciation	847,825
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,286,696
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	847,825
Operating Properties [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenwood, IN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	223,702
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,574,142
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	310,465
Real Estate and Accumulated Depreciation, Carrying Amount of Land	223,702
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,884,607
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,108,309
Real Estate and Accumulated Depreciation, Accumulated Depreciation	215,974
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,108,309
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	215,974
Operating Properties [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenwood, IN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	272,823
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,606,920
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	411,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land	272,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,018,729
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,291,552
Real Estate and Accumulated Depreciation, Accumulated Depreciation	269,601
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,291,552
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	269,601
Operating Properties [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greenwood, IN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,374,664
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,963,830
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,540,221
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,374,664
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	31,504,051
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	32,878,715
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,328,513
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	32,878,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,328,513
Operating Properties [Member] | 100 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	555,549
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,305,563
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,228,880
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,632,232
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,861,112
Real Estate and Accumulated Depreciation, Accumulated Depreciation	30,651
Real Estate and Accumulated Depreciation, Date Acquired or Developed
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,861,112
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	30,651
Operating Properties [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	464,237
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,829,595
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,301,738
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,992,094
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,293,832
Real Estate and Accumulated Depreciation, Accumulated Depreciation	745,613
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,293,832
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	745,613
Operating Properties [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Groveport, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,875,607
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,937,935
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	334,714
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,875,607
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,272,649
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,148,256
Real Estate and Accumulated Depreciation, Accumulated Depreciation	598,991
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,148,256
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	598,991
Operating Properties [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hagerstown, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,356,207
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	30,555,105
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,741,685
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,169,627
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	33,911,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,362,445
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	33,911,312
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,362,445
Operating Properties [Member] | 1 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	974,675
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,579,869
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,727,218
Real Estate and Accumulated Depreciation, Carrying Amount of Land	974,675
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,307,087
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,281,762
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,390,357
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,281,762
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,390,357
Operating Properties [Member] | 1317 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,650,423
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,950,516
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,128,829
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,472,110
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,600,939
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,755,394
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,600,939
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,755,394
Operating Properties [Member] | 21 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	263,668
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,167,118
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,128,297
Real Estate and Accumulated Depreciation, Carrying Amount of Land	265,719
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,293,364
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,559,083
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,548,369
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,559,083
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,548,369
Operating Properties [Member] | 22 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,097,368
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,760,778
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,519,852
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,097,368
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,280,630
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,377,998
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,629,037
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,377,998
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,629,037
Operating Properties [Member] | 5 Manhattan Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	207,368
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,540,748
Real Estate and Accumulated Depreciation, Carrying Amount of Land	212,694
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,535,422
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,748,116
Real Estate and Accumulated Depreciation, Accumulated Depreciation	543,511
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,748,116
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	543,511
Operating Properties [Member] | 521 Butler Farm Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	750,769
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,911,149
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	266,469
Real Estate and Accumulated Depreciation, Carrying Amount of Land	710,486
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,217,901
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,928,387
Real Estate and Accumulated Depreciation, Accumulated Depreciation	957,344
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,928,387
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	957,344
Operating Properties [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover Park, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,639,734
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,310,741
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	578,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,639,734
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,889,400
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,529,134
Real Estate and Accumulated Depreciation, Accumulated Depreciation	543,284
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,529,134
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	543,284
Operating Properties [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover Park, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,293,284
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,235,926
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	836,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,293,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,072,893
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,366,177
Real Estate and Accumulated Depreciation, Accumulated Depreciation	767,470
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	21,366,177
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	767,470
Operating Properties [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,245,187
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,391,010
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,822,710
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,813,487
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,636,197
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,201,335
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,636,197
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,201,335
Operating Properties [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Harrisburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,194,872
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,991,436
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,541,093
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,687,013
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,040,388
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	29,727,401
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,143,282
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	29,727,401
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,143,282
Operating Properties [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Harrisburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	7,743,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	29,161,032
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,368,557
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,536,275
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	36,904,832
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,033,344
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	36,904,832
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,033,344
Operating Properties [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Harrisburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	464,534
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,066,272
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	189,405
Real Estate and Accumulated Depreciation, Carrying Amount of Land	464,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,255,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,720,211
Real Estate and Accumulated Depreciation, Accumulated Depreciation	246,920
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,720,211
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	246,920
Operating Properties [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Harrisburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	954,130
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,585,367
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	339,743
Real Estate and Accumulated Depreciation, Carrying Amount of Land	954,130
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,925,110
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,879,240
Real Estate and Accumulated Depreciation, Accumulated Depreciation	407,825
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,879,240
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	407,825
Operating Properties [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hawthorne, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,203,194
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,758,809
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	94,181
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,203,194
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,852,990
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,056,184
Real Estate and Accumulated Depreciation, Accumulated Depreciation	214,142
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,056,184
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	214,142
Operating Properties [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hebron, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	305,471
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,434,505
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	306,564
Real Estate and Accumulated Depreciation, Carrying Amount of Land	305,471
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,741,069
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,046,540
Real Estate and Accumulated Depreciation, Accumulated Depreciation	248,502
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,046,540
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	248,502
Operating Properties [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hebron, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	401,410
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,087,899
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	466,391
Real Estate and Accumulated Depreciation, Carrying Amount of Land	401,410
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,554,290
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,955,700
Real Estate and Accumulated Depreciation, Accumulated Depreciation	198,999
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,955,700
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	198,999
Operating Properties [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hebron, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	292,096
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,502,486
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	156,556
Real Estate and Accumulated Depreciation, Carrying Amount of Land	292,096
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,659,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,951,137
Real Estate and Accumulated Depreciation, Accumulated Depreciation	134,921
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,951,137
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	134,921
Operating Properties [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hebron, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	370,149
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,095,116
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	223,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land	370,149
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,318,552
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,688,701
Real Estate and Accumulated Depreciation, Accumulated Depreciation	195,790
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,688,701
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	195,790
Operating Properties [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hebron, KY
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	444,318
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,811,889
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	257,404
Real Estate and Accumulated Depreciation, Carrying Amount of Land	444,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,069,293
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,513,611
Real Estate and Accumulated Depreciation, Accumulated Depreciation	202,478
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,513,611
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	202,478
Operating Properties [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	94,274
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,219,495
Real Estate and Accumulated Depreciation, Carrying Amount of Land	791,880
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,521,889
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,313,769
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,175,122
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,313,769
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,175,122
Operating Properties [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	122,203
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,309,887
Real Estate and Accumulated Depreciation, Carrying Amount of Land	526,266
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,905,824
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,432,090
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,093,077
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,432,090
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,093,077
Operating Properties [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	100,106
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,608,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land	431,106
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,277,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,708,954
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,355,746
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,708,954
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,355,746
Operating Properties [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	107,586
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,582,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land	505,700
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,184,650
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,690,350
Real Estate and Accumulated Depreciation, Accumulated Depreciation	912,889
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,690,350
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	912,889
Operating Properties [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,548,668
Real Estate and Accumulated Depreciation, Initial Cost of Land	521,122
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,525,947
Real Estate and Accumulated Depreciation, Carrying Amount of Land	825,092
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,221,977
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,047,069
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,564,462
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,047,069
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,564,462
Operating Properties [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	484,001
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,071,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land	173,623
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,381,795
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,555,418
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,577,538
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,555,418
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,577,538
Operating Properties [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	282,996
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,160,892
Real Estate and Accumulated Depreciation, Carrying Amount of Land	283,368
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,160,520
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,443,888
Real Estate and Accumulated Depreciation, Accumulated Depreciation	984,864
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,443,888
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	984,864
Operating Properties [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	143,661
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,213,832
Real Estate and Accumulated Depreciation, Carrying Amount of Land	132,655
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,224,838
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,357,493
Real Estate and Accumulated Depreciation, Accumulated Depreciation	533,759
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,357,493
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	533,759
Operating Properties [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	748,693
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,805,541
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,525,421
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,028,813
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,554,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation	977,259
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,554,234
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	977,259
Operating Properties [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	230,622
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,758,237
Real Estate and Accumulated Depreciation, Carrying Amount of Land	231,692
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,757,167
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,988,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,300,726
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,988,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,300,726
Operating Properties [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	319,289
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,156,348
Real Estate and Accumulated Depreciation, Carrying Amount of Land	320,450
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,155,187
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,475,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,618,112
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,475,637
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,618,112
Operating Properties [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	234,564
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,338,836
Real Estate and Accumulated Depreciation, Carrying Amount of Land	235,698
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,337,702
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,573,400
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,964,835
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,573,400
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,964,835
Operating Properties [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	182,810
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,700,754
Real Estate and Accumulated Depreciation, Carrying Amount of Land	183,888
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,699,676
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,883,564
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,547,668
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,883,564
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,547,668
Operating Properties [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hinckley, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,547,677
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,691,911
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-2,376,899
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,924,640
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,938,049
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	37,862,689
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,028,220
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	37,862,689
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,028,220
Operating Properties [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hopkins,MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	813,036
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,503,075
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	364,382
Real Estate and Accumulated Depreciation, Carrying Amount of Land	813,036
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,867,457
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,680,493
Real Estate and Accumulated Depreciation, Accumulated Depreciation	148,094
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,680,493
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	148,094
Operating Properties [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hopkins,MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	339,336
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,106,454
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	80,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land	339,336
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,187,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,526,585
Real Estate and Accumulated Depreciation, Accumulated Depreciation	89,465
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,526,585
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	89,465
Operating Properties [Member] | 100 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	38,729
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	349,811
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	59,073
Real Estate and Accumulated Depreciation, Carrying Amount of Land	38,729
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	408,884
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	447,613
Real Estate and Accumulated Depreciation, Accumulated Depreciation	170,127
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	447,613
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	170,127
Operating Properties [Member] | 100 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,102,784
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	20,391,485
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,764,784
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,729,485
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,494,269
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,044,882
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,494,269
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,044,882
Operating Properties [Member] | 100-107 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	239,528
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,163,498
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	617,512
Real Estate and Accumulated Depreciation, Carrying Amount of Land	255,528
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,765,010
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,020,538
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,164,464
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,020,538
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,164,464
Operating Properties [Member] | 101 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	651,990
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,888,989
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,076,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	732,552
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,885,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,617,821
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,577,353
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1977
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,617,821
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,577,353
Operating Properties [Member] | 101-111 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	350,561
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,166,389
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,200,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land	452,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,264,712
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,716,963
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,015,331
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,716,963
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,015,331
Operating Properties [Member] | 102 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,110,209
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,301,302
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,203,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,185,635
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,429,717
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,615,352
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,226,377
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,615,352
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,226,377
Operating Properties [Member] | 103-109 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	270,906
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,448,500
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	459,093
Real Estate and Accumulated Depreciation, Carrying Amount of Land	270,906
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,907,592
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,178,498
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,259,056
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,178,498
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,259,056
Operating Properties [Member] | 104 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,248,148
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	593,447
Real Estate and Accumulated Depreciation, Carrying Amount of Land	189,793
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,651,802
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,841,595
Real Estate and Accumulated Depreciation, Accumulated Depreciation	686,901
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,841,595
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	686,901
Operating Properties [Member] | 110 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	673,041
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,776,369
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,953,408
Real Estate and Accumulated Depreciation, Carrying Amount of Land	673,041
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,729,777
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,402,818
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,295,384
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,402,818
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,295,384
Operating Properties [Member] | 111-159 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	489,032
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,126,151
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,275,890
Real Estate and Accumulated Depreciation, Carrying Amount of Land	489,032
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,402,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,891,073
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,540,177
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,891,073
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,540,177
Operating Properties [Member] | 113-123 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	351,072
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,171,001
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	471,717
Real Estate and Accumulated Depreciation, Carrying Amount of Land	451,731
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,542,059
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,993,790
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,488,391
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,993,790
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,488,391
Operating Properties [Member] | 120 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	533,142
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,830,515
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,896,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land	558,142
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,702,132
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,260,274
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,840,804
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,260,274
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,840,804
Operating Properties [Member] | 123-135 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	292,360
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,411,677
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,125,649
Real Estate and Accumulated Depreciation, Carrying Amount of Land	393,019
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,436,667
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,829,686
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,971,553
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,829,686
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,971,553
Operating Properties [Member] | 132 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,333,642
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,856,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,408,041
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,781,673
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,189,714
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,658,898
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,189,714
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,658,898
Operating Properties [Member] | 161-175 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	294,673
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,663,722
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	957,148
Real Estate and Accumulated Depreciation, Carrying Amount of Land	294,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,620,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,915,543
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,661,733
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1976
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,915,543
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,661,733
Operating Properties [Member] | 181-187 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	360,549
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,259,984
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	787,154
Real Estate and Accumulated Depreciation, Carrying Amount of Land	360,549
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,047,138
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,407,687
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,951,593
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,407,687
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,951,593
Operating Properties [Member] | 2 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,281,870
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,767,374
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,630,465
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,265,363
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,414,346
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,679,709
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,306,233
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,679,709
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,306,233
Operating Properties [Member] | 200 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	638,513
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,811,323
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,190,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land	638,513
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,001,496
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,640,009
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,588,279
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,640,009
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,588,279
Operating Properties [Member] | 200-264 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	502,705
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,540,597
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,297,906
Real Estate and Accumulated Depreciation, Carrying Amount of Land	502,705
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,838,503
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,341,208
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,983,479
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,341,208
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,983,479
Operating Properties [Member] | 201 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	380,127
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,433,433
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,324,673
Real Estate and Accumulated Depreciation, Carrying Amount of Land	380,802
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,757,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,138,233
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,469,255
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,138,233
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,469,255
Operating Properties [Member] | 210-223 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	270,282
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,441,276
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,098,514
Real Estate and Accumulated Depreciation, Carrying Amount of Land	270,282
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,539,790
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,810,072
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,888,542
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1972
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,810,072
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,888,542
Operating Properties [Member] | 220 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	629,944
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,733,228
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,917,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land	629,944
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,650,477
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,280,421
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,058,488
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,280,421
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,058,488
Operating Properties [Member] | 231-237 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	436,952
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,948,963
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,323,981
Real Estate and Accumulated Depreciation, Carrying Amount of Land	436,952
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,272,944
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,709,896
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,317,867
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,709,896
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,317,867
Operating Properties [Member] | 240 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	629,944
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,733,234
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,999,990
Real Estate and Accumulated Depreciation, Carrying Amount of Land	629,944
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,733,224
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,363,168
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,841,222
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,363,168
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,841,222
Operating Properties [Member] | 261-283 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	464,871
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,951,972
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,830,425
Real Estate and Accumulated Depreciation, Carrying Amount of Land	464,871
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,782,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,247,268
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,644,978
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,247,268
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,644,978
Operating Properties [Member] | 300 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	696,061
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,339,991
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	640,370
Real Estate and Accumulated Depreciation, Carrying Amount of Land	696,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,980,360
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,676,421
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,823,181
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,676,421
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,823,181
Operating Properties [Member] | 300 Welsh Road - Building 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	180,459
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,441,473
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	633,163
Real Estate and Accumulated Depreciation, Carrying Amount of Land	180,459
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,074,635
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,255,094
Real Estate and Accumulated Depreciation, Accumulated Depreciation	920,446
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,255,094
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	920,446
Operating Properties [Member] | 300 Welsh Road - Building 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	282,493
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,256,508
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,769,703
Real Estate and Accumulated Depreciation, Carrying Amount of Land	282,493
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,026,211
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,308,704
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,907,245
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,308,704
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,907,245
Operating Properties [Member] | 300-309 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	369,475
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,338,761
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,834,004
Real Estate and Accumulated Depreciation, Carrying Amount of Land	376,475
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,165,765
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,542,240
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,736,644
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,542,240
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,736,644
Operating Properties [Member] | 4 Walnut Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,515,115
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,809,109
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,515,115
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,809,109
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,324,224
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,046,256
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,324,224
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,046,256
Operating Properties [Member] | 400-445 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	543,628
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,910,226
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,849,211
Real Estate and Accumulated Depreciation, Carrying Amount of Land	583,628
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,719,437
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,303,065
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,791,088
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,303,065
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,791,088
Operating Properties [Member] | 455 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,351,011
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,503,449
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,982,282
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,322,317
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,514,425
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,836,742
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,405,567
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,836,742
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,405,567
Operating Properties [Member] | 5 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,065,951
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,357,952
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,939,712
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,484,191
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,423,903
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,689,060
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,423,903
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,689,060
Operating Properties [Member] | 506 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	208,140
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	895,470
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	894,621
Real Estate and Accumulated Depreciation, Carrying Amount of Land	208,140
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,790,091
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,998,231
Real Estate and Accumulated Depreciation, Accumulated Depreciation	878,782
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1973
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,998,231
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	878,782
Operating Properties [Member] | 507 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	644,900
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,804,100
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,408,030
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,131,380
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,725,650
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,857,030
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,683,111
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,857,030
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,683,111
Operating Properties [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plymouth, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	392,026
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,433,678
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	747,609
Real Estate and Accumulated Depreciation, Carrying Amount of Land	384,235
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,189,078
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,573,313
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,667,699
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,573,313
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,667,699
Operating Properties [Member] | 555 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	727,420
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,353,650
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,483,904
Real Estate and Accumulated Depreciation, Carrying Amount of Land	709,967
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,855,008
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,564,975
Real Estate and Accumulated Depreciation, Accumulated Depreciation	562,069
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,564,975
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	562,069
Operating Properties [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plymouth, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,616,360
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,487,462
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	487,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,616,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,974,487
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,590,847
Real Estate and Accumulated Depreciation, Accumulated Depreciation	246,351
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,590,847
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	246,351
Operating Properties [Member] | 680 Blair Mill Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,527,151
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,513,692
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,138,577
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,902,266
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,040,843
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,001,289
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	21,040,843
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,001,289
Operating Properties [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plymouth, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,327,017
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,527,404
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	476,115
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,327,017
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,003,519
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,330,536
Real Estate and Accumulated Depreciation, Accumulated Depreciation	235,723
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,330,536
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	235,723
Operating Properties [Member] | 7 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,631,696
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	18,432,489
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,631,956
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,432,229
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,064,185
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,441,129
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	21,064,185
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,441,129
Operating Properties [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,157,049
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,620,956
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,332,594
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,157,049
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,953,550
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,110,599
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,364,597
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,110,599
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,364,597
Operating Properties [Member] | 700 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,551,777
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,020,638
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,596,408
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,565,140
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,603,683
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,168,823
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,485,966
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,168,823
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,485,966
Operating Properties [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	392,138
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,565,787
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	444,197
Real Estate and Accumulated Depreciation, Carrying Amount of Land	392,138
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,009,985
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,402,123
Real Estate and Accumulated Depreciation, Accumulated Depreciation	929,892
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,402,123
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	929,892
Operating Properties [Member] | 747 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,607,238
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,032,964
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,607,977
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,032,225
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,640,202
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,120,360
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,640,202
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,120,360
Operating Properties [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	972,232
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,892,085
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	587,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land	972,232
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,479,259
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,451,491
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,890,450
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1957
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,451,491
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,890,450
Operating Properties [Member] | 767 Electronic Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,229,685
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,436,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,241,970
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,424,112
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,666,082
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,433,977
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,666,082
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,433,977
Operating Properties [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	203,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	811,093
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	364,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land	203,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,175,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,379,117
Real Estate and Accumulated Depreciation, Accumulated Depreciation	456,473
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,379,117
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	456,473
Operating Properties [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	509,351
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,549,504
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	395,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land	509,351
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,945,222
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,454,573
Real Estate and Accumulated Depreciation, Accumulated Depreciation	203,455
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,454,573
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	203,455
Operating Properties [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	203,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	811,093
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	96,949
Real Estate and Accumulated Depreciation, Carrying Amount of Land	203,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	908,043
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,111,290
Real Estate and Accumulated Depreciation, Accumulated Depreciation	387,208
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,111,290
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	387,208
Operating Properties [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	558,491
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,740,552
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	129,761
Real Estate and Accumulated Depreciation, Carrying Amount of Land	558,491
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,870,313
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,428,804
Real Estate and Accumulated Depreciation, Accumulated Depreciation	218,761
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,428,804
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	218,761
Operating Properties [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	203,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	811,093
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	183,052
Real Estate and Accumulated Depreciation, Carrying Amount of Land	203,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	994,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,197,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation	405,613
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,197,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	405,613
Operating Properties [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	426,927
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,460,513
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	234,333
Real Estate and Accumulated Depreciation, Carrying Amount of Land	426,927
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,694,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,121,773
Real Estate and Accumulated Depreciation, Accumulated Depreciation	174,611
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,121,773
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	174,611
Operating Properties [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,120,328
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,427,358
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	99,226
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,120,328
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,526,584
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,646,912
Real Estate and Accumulated Depreciation, Accumulated Depreciation	149,765
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,646,912
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	149,765
Operating Properties [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	545,501
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,927,700
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,014,387
Real Estate and Accumulated Depreciation, Carrying Amount of Land	545,501
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,942,086
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,487,587
Real Estate and Accumulated Depreciation, Accumulated Depreciation	306,335
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,487,587
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	306,335
Operating Properties [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	993,015
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,423,174
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	108,273
Real Estate and Accumulated Depreciation, Carrying Amount of Land	993,015
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,531,447
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,524,462
Real Estate and Accumulated Depreciation, Accumulated Depreciation	117,804
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,524,462
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	117,804
Operating Properties [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,340,609
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,489,720
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,358,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,340,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,848,527
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,189,136
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,387,761
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,189,136
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,387,761
Operating Properties [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	906,947
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,157,802
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	158,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land	906,947
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,316,429
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,223,376
Real Estate and Accumulated Depreciation, Accumulated Depreciation	102,313
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,223,376
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	102,313
Operating Properties [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	201,469
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,631,561
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	175,697
Real Estate and Accumulated Depreciation, Carrying Amount of Land	201,469
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,807,259
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,008,728
Real Estate and Accumulated Depreciation, Accumulated Depreciation	78,814
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,008,728
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	78,814
Operating Properties [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,268,707
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,079,811
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	153,822
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,268,707
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,233,633
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,502,340
Real Estate and Accumulated Depreciation, Accumulated Depreciation	149,476
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,502,340
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	149,476
Operating Properties [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,110,988
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,351,946
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,271,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,135,483
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,598,514
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,733,997
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,691,079
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,733,997
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,691,079
Operating Properties [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,087,554
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,897,117
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	155,731
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,087,554
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,052,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,140,402
Real Estate and Accumulated Depreciation, Accumulated Depreciation	151,869
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,140,402
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	151,869
Operating Properties [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	797,931
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,950,894
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	401,107
Real Estate and Accumulated Depreciation, Carrying Amount of Land	799,560
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,350,372
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,149,932
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,003,943
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,149,932
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,003,943
Operating Properties [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,548,542
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,512,041
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	271,076
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,548,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,783,118
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,331,660
Real Estate and Accumulated Depreciation, Accumulated Depreciation	174,062
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,331,660
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	174,062
Operating Properties [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,006,194
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,412,584
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,777,537
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,008,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,187,773
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,196,315
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,018,474
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,196,315
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,018,474
Operating Properties [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	80,730
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	870,656
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	145,476
Real Estate and Accumulated Depreciation, Carrying Amount of Land	80,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,016,132
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,096,862
Real Estate and Accumulated Depreciation, Accumulated Depreciation	48,433
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,096,862
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	48,433
Operating Properties [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	146,654
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,620,780
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	59,710
Real Estate and Accumulated Depreciation, Carrying Amount of Land	146,654
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,680,489
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,827,143
Real Estate and Accumulated Depreciation, Accumulated Depreciation	90,144
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,827,143
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	90,144
Operating Properties [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	510,102
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,129,042
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	441,345
Real Estate and Accumulated Depreciation, Carrying Amount of Land	510,102
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,570,387
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,080,489
Real Estate and Accumulated Depreciation, Accumulated Depreciation	203,222
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,080,489
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	203,222
Operating Properties [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	218,850
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,639,902
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	329,902
Real Estate and Accumulated Depreciation, Carrying Amount of Land	218,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,969,803
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,188,653
Real Estate and Accumulated Depreciation, Accumulated Depreciation	82,673
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,188,653
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	82,673
Operating Properties [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	211,279
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,554,156
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	111,783
Real Estate and Accumulated Depreciation, Carrying Amount of Land	211,279
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,665,939
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,877,218
Real Estate and Accumulated Depreciation, Accumulated Depreciation	78,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,877,218
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	78,870
Operating Properties [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,396,794
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,855,857
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,699,632
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,553,019
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,252,651
Real Estate and Accumulated Depreciation, Accumulated Depreciation	303,736
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,252,651
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	303,736
Operating Properties [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	283,107
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,077,323
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	284,788
Real Estate and Accumulated Depreciation, Carrying Amount of Land	283,107
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,362,111
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,645,218
Real Estate and Accumulated Depreciation, Accumulated Depreciation	110,954
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,645,218
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	110,954
Operating Properties [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	367,446
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,952,453
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	133,350
Real Estate and Accumulated Depreciation, Carrying Amount of Land	367,446
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,085,802
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,453,248
Real Estate and Accumulated Depreciation, Accumulated Depreciation	101,311
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,453,248
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	101,311
Operating Properties [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,377,193
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,497,809
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,405,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,469,103
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,875,002
Real Estate and Accumulated Depreciation, Accumulated Depreciation	159,872
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,875,002
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	159,872
Operating Properties [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,830,419
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,063,858
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,861,540
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,032,737
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,894,277
Real Estate and Accumulated Depreciation, Accumulated Depreciation	442,923
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,894,277
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	442,923
Operating Properties [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	755,121
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,155,774
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	247,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land	755,121
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,403,171
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,158,292
Real Estate and Accumulated Depreciation, Accumulated Depreciation	170,031
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,158,292
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	170,031
Operating Properties [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	418,580
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,564,587
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	295,011
Real Estate and Accumulated Depreciation, Carrying Amount of Land	418,580
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,859,598
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,278,178
Real Estate and Accumulated Depreciation, Accumulated Depreciation	88,933
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,278,178
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	88,933
Operating Properties [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,540,109
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,524,625
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,966,472
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,098,262
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,064,734
Real Estate and Accumulated Depreciation, Accumulated Depreciation	204,640
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,064,734
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	204,640
Operating Properties [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	438,853
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,030,396
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	506,207
Real Estate and Accumulated Depreciation, Carrying Amount of Land	438,853
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,536,603
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,975,456
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,604,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,975,456
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,604,732
Operating Properties [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	529,876
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,267,872
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	149,476
Real Estate and Accumulated Depreciation, Carrying Amount of Land	529,876
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,417,348
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,947,224
Real Estate and Accumulated Depreciation, Accumulated Depreciation	133,420
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,947,224
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	133,420
Operating Properties [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	363,339
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,509,186
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	266,552
Real Estate and Accumulated Depreciation, Carrying Amount of Land	363,339
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,775,738
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,139,077
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,200,463
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,139,077
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,200,463
Operating Properties [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	329,961
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,944,959
Real Estate and Accumulated Depreciation, Carrying Amount of Land	592,234
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,682,686
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,274,920
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,002,826
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,274,920
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,002,826
Operating Properties [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	197,226
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	935,036
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	474,198
Real Estate and Accumulated Depreciation, Carrying Amount of Land	197,226
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,409,234
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,606,460
Real Estate and Accumulated Depreciation, Accumulated Depreciation	57,052
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,606,460
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	57,052
Operating Properties [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	289,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,559,857
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,281,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land	289,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,841,118
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,130,118
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,631,421
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,130,118
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,631,421
Operating Properties [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	284,403
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,953,014
Real Estate and Accumulated Depreciation, Carrying Amount of Land	503,779
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,733,638
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,237,417
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,075,204
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,237,417
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,075,204
Operating Properties [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	298,999
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,417,513
Real Estate and Accumulated Depreciation, Carrying Amount of Land	496,186
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,220,326
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,716,512
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,014,594
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,716,512
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,014,594
Operating Properties [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	452,439
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,016,585
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	57,074
Real Estate and Accumulated Depreciation, Carrying Amount of Land	452,439
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,073,658
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,526,097
Real Estate and Accumulated Depreciation, Accumulated Depreciation	81,921
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,526,097
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	81,921
Operating Properties [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	311,952
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,165,907
Real Estate and Accumulated Depreciation, Carrying Amount of Land	492,869
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,984,990
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,477,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,028,469
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,477,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,028,469
Operating Properties [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	414,691
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,459,484
Real Estate and Accumulated Depreciation, Carrying Amount of Land	414,691
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,459,484
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,874,175
Real Estate and Accumulated Depreciation, Accumulated Depreciation	643,446
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,874,175
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	643,446
Operating Properties [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	293,534
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,036,269
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	724,255
Real Estate and Accumulated Depreciation, Carrying Amount of Land	306,147
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,747,911
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,054,058
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,217,765
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,054,058
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,217,765
Operating Properties [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	226,973
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,174,979
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	77,965
Real Estate and Accumulated Depreciation, Carrying Amount of Land	226,973
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,252,944
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,479,917
Real Estate and Accumulated Depreciation, Accumulated Depreciation	64,788
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,479,917
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	64,788
Operating Properties [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	244,240
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,412,622
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	75,463
Real Estate and Accumulated Depreciation, Carrying Amount of Land	244,240
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,488,085
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,732,325
Real Estate and Accumulated Depreciation, Accumulated Depreciation	120,514
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,732,325
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	120,514
Operating Properties [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	252,907
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,504,053
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	55,906
Real Estate and Accumulated Depreciation, Carrying Amount of Land	252,907
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,559,959
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,812,866
Real Estate and Accumulated Depreciation, Accumulated Depreciation	125,078
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,812,866
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	125,078
Operating Properties [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,519,458
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,135,548
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,649,598
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,520,074
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,784,530
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,304,604
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,575,531
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,304,604
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,575,531
Operating Properties [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,173,287
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,868,256
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,740,727
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,173,942
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,608,328
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,782,270
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,362,379
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,782,270
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,362,379
Operating Properties [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,243,541
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,452,951
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,513,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,183,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,696,492
Real Estate and Accumulated Depreciation, Accumulated Depreciation	570,606
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,696,492
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	570,606
Operating Properties [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	900,953
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,323,727
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	91,219
Real Estate and Accumulated Depreciation, Carrying Amount of Land	900,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,414,946
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,315,899
Real Estate and Accumulated Depreciation, Accumulated Depreciation	203,059
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,315,899
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	203,059
Operating Properties [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	530,494
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,108,626
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	255,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land	530,494
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,364,132
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,894,626
Real Estate and Accumulated Depreciation, Accumulated Depreciation	191,504
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,894,626
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	191,504
Operating Properties [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	450,422
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,304,942
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	637,280
Real Estate and Accumulated Depreciation, Carrying Amount of Land	450,422
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,942,222
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,392,644
Real Estate and Accumulated Depreciation, Accumulated Depreciation	162,469
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,392,644
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	162,469
Operating Properties [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,515,862
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	26,894,221
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,083,514
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,326,569
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,410,083
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,209,471
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	31,410,083
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,209,471
Operating Properties [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,893,405
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,593,197
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,849,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,899,861
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,435,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,335,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,562,574
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,335,637
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,562,574
Operating Properties [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,399,365
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,344,650
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,579,558
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,374,012
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,949,561
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,323,573
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,490,162
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,323,573
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,490,162
Operating Properties [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,290,001
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,297,141
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,023,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,290,002
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,321,010
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	19,611,012
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,164,247
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	19,611,012
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,164,247
Operating Properties [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,774,995
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,364,767
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,362,915
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,775,021
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,727,655
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,502,676
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,342,008
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,502,676
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,342,008
Operating Properties [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	638,453
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,258,815
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	694,831
Real Estate and Accumulated Depreciation, Carrying Amount of Land	638,477
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,953,621
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,592,098
Real Estate and Accumulated Depreciation, Accumulated Depreciation	962,028
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,592,098
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	962,028
Operating Properties [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	504,317
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,878,351
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,054,230
Real Estate and Accumulated Depreciation, Carrying Amount of Land	504,341
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,932,557
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,436,898
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,467,037
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,436,898
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,467,037
Operating Properties [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,748,348
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,388,335
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,120,319
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,016,364
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,136,683
Real Estate and Accumulated Depreciation, Accumulated Depreciation	493,289
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,136,683
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	493,289
Operating Properties [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Isle of Man, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	11,888,058
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,003,668
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-2,769,630
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,185,846
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	32,936,250
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	44,122,096
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,170,109
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	44,122,096
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,170,109
Operating Properties [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Itasca, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	842,043
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	984,087
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	85,979
Real Estate and Accumulated Depreciation, Carrying Amount of Land	842,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,070,066
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,912,109
Real Estate and Accumulated Depreciation, Accumulated Depreciation	41,246
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,912,109
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	41,246
Operating Properties [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Itasca, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	875,172
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,071,051
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	52,042
Real Estate and Accumulated Depreciation, Carrying Amount of Land	875,172
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,123,094
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,998,266
Real Estate and Accumulated Depreciation, Accumulated Depreciation	90,707
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,998,266
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	90,707
Operating Properties [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Itasca, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,339,627
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,763,288
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	184,424
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,339,627
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,947,711
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,287,338
Real Estate and Accumulated Depreciation, Accumulated Depreciation	157,326
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,287,338
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	157,326
Operating Properties [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Itasca, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	866,378
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,112,616
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	46,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land	866,378
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,159,361
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,025,739
Real Estate and Accumulated Depreciation, Accumulated Depreciation	82,105
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,025,739
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	82,105
Operating Properties [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Itasca, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	945,251
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,010,181
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	46,316
Real Estate and Accumulated Depreciation, Carrying Amount of Land	945,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,056,497
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,001,748
Real Estate and Accumulated Depreciation, Accumulated Depreciation	76,319
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,001,748
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	76,319
Operating Properties [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Jessup, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,246,618
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,844,393
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	424,643
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,246,618
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,269,035
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,515,653
Real Estate and Accumulated Depreciation, Accumulated Depreciation	283,274
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,515,653
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	283,274
Operating Properties [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Jessup, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,488,746
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,072,440
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,118,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,488,746
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,190,780
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,679,526
Real Estate and Accumulated Depreciation, Accumulated Depreciation	385,761
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,679,526
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	385,761
Operating Properties [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Jessup, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	590,922
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,374,522
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	93,541
Real Estate and Accumulated Depreciation, Carrying Amount of Land	590,922
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,468,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,058,985
Real Estate and Accumulated Depreciation, Accumulated Depreciation	140,981
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,058,985
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	140,981
Operating Properties [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Kennesaw, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	808,159
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,712,959
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	613,490
Real Estate and Accumulated Depreciation, Carrying Amount of Land	808,159
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,326,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,134,608
Real Estate and Accumulated Depreciation, Accumulated Depreciation	319,389
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,134,608
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	319,389
Operating Properties [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Kennesaw, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,612,924
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,771,680
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,387,503
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,612,924
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,159,183
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,772,107
Real Estate and Accumulated Depreciation, Accumulated Depreciation	620,142
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,772,107
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	620,142
Operating Properties [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Kennesaw, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	716,860
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,962,212
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	433,426
Real Estate and Accumulated Depreciation, Carrying Amount of Land	716,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,395,639
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,112,499
Real Estate and Accumulated Depreciation, Accumulated Depreciation	362,293
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,112,499
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	362,293
Operating Properties [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Kettering, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,849,890
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,219,855
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-2,780,348
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,209,001
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	34,080,396
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	44,289,397
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,221,467
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	44,289,397
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,221,467
Operating Properties [Member] | 151 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,218,086
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,937,866
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,834,149
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,187,900
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,802,201
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,990,101
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,179,231
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,990,101
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,179,231
Operating Properties [Member] | 170 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	547,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,137,400
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,612,558
Real Estate and Accumulated Depreciation, Carrying Amount of Land	458,232
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,839,526
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,297,758
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,172,026
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,297,758
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,172,026
Operating Properties [Member] | 180 South Warner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	995,393
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,781,614
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,777,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,777,007
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,128,905
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2009
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,777,007
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,128,905
Operating Properties [Member] | 190 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	552,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,162,600
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,545,816
Real Estate and Accumulated Depreciation, Carrying Amount of Land	461,909
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,798,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,260,616
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,231,829
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,260,616
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,231,829
Operating Properties [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,110,111
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	12,322,939
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,132,519
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,300,531
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,433,050
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,289,689
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,433,050
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,289,689
Operating Properties [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,370,895
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	15,284,223
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,413,514
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	15,241,604
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,655,118
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,061,755
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,655,118
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,061,755
Operating Properties [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	509,580
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,057,624
Real Estate and Accumulated Depreciation, Carrying Amount of Land	574,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,993,052
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,567,204
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,541,908
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,567,204
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,541,908
Operating Properties [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,645,246
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	30,080,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,581,649
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,144,035
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,725,684
Real Estate and Accumulated Depreciation, Accumulated Depreciation	10,753,365
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	31,725,684
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	10,753,365
Operating Properties [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	509,580
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,663,076
Real Estate and Accumulated Depreciation, Carrying Amount of Land	592,886
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,579,770
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,172,656
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,236,260
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,172,656
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,236,260
Operating Properties [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,020,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,649,705
Real Estate and Accumulated Depreciation, Carrying Amount of Land	978,402
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,691,303
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,669,705
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,406,070
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,669,705
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,406,070
Operating Properties [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	607,210
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,122,044
Real Estate and Accumulated Depreciation, Carrying Amount of Land	649,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,079,462
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,729,254
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,433,510
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,729,254
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,433,510
Operating Properties [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	764,370
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,646,466
Real Estate and Accumulated Depreciation, Carrying Amount of Land	867,815
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,543,021
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,410,836
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,670,057
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,410,836
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,670,057
Operating Properties [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	679,440
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,503,074
Real Estate and Accumulated Depreciation, Carrying Amount of Land	774,096
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,408,418
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,182,514
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,597,991
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,182,514
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,597,991
Operating Properties [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,191,449
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,476,299
Real Estate and Accumulated Depreciation, Carrying Amount of Land	946,703
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,721,045
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,667,748
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,111,514
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,667,748
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,111,514
Operating Properties [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	601,956
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,192,852
Real Estate and Accumulated Depreciation, Carrying Amount of Land	611,436
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,183,372
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,794,808
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,008,387
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,794,808
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,008,387
Operating Properties [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	928,637
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,882,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,210,137
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,600,769
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,810,906
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,562,017
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,810,906
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,562,017
Operating Properties [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	776,496
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,139,068
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,537,958
Real Estate and Accumulated Depreciation, Carrying Amount of Land	776,496
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,677,025
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,453,521
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,945,285
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,453,521
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,945,285
Operating Properties [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,204,839
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,830,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,223,875
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,811,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,034,911
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,276,539
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,034,911
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,276,539
Operating Properties [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	236,432
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,856,252
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	820,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land	236,432
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,676,701
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,913,133
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,127,390
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,913,133
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,127,390
Operating Properties [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	217,734
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,759,489
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	406,692
Real Estate and Accumulated Depreciation, Carrying Amount of Land	217,809
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,166,106
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,383,915
Real Estate and Accumulated Depreciation, Accumulated Depreciation	990,639
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,383,915
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	990,639
Operating Properties [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	397,178
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,836,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land	350,874
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,882,573
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,233,447
Real Estate and Accumulated Depreciation, Accumulated Depreciation	894,044
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,233,447
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	894,044
Operating Properties [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	717,001
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,816,121
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,824,138
Real Estate and Accumulated Depreciation, Carrying Amount of Land	717,001
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,640,259
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,357,260
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,859,492
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,357,260
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,859,492
Operating Properties [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	705,317
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,737,487
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,227,341
Real Estate and Accumulated Depreciation, Carrying Amount of Land	705,317
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,964,828
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,670,145
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,739,395
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,670,145
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,739,395
Operating Properties [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	952,911
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,722,830
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,145,922
Real Estate and Accumulated Depreciation, Carrying Amount of Land	952,911
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,868,752
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,821,663
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,073,206
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1971
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,821,663
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,073,206
Operating Properties [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	King of Prussia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	952,361
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,722,830
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,217,277
Real Estate and Accumulated Depreciation, Carrying Amount of Land	952,361
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,940,107
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,892,468
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,688,897
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1971
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,892,468
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,688,897
Operating Properties [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lakeland, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	650,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,444,220
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	650,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,444,220
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,094,220
Real Estate and Accumulated Depreciation, Accumulated Depreciation	321,337
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,094,220
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	321,337
Operating Properties [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Landover,MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,187,620
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,598,346
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	182,789
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,187,620
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,781,135
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,968,755
Real Estate and Accumulated Depreciation, Accumulated Depreciation	207,464
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,968,755
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	207,464
Operating Properties [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	LaPorte, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	975,974
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,409,036
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	51,385
Real Estate and Accumulated Depreciation, Carrying Amount of Land	977,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,458,852
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,436,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation	799,109
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,436,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	799,109
Operating Properties [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	LaPorte, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,561,931
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,695,493
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	237,274
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,566,047
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,928,651
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,494,698
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,191,065
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,494,698
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,191,065
Operating Properties [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lebanon,IN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,612,787
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,065,552
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,213,251
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,612,787
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,278,803
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,891,590
Real Estate and Accumulated Depreciation, Accumulated Depreciation	872,383
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,891,590
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	872,383
Operating Properties [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lehigh, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	893,441
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,510,457
Real Estate and Accumulated Depreciation, Carrying Amount of Land	779,330
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,624,568
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,403,898
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,808,110
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,403,898
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,808,110
Operating Properties [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lehigh, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	11,249,550
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	45,456,591
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,254,716
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	45,451,425
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	56,706,141
Real Estate and Accumulated Depreciation, Accumulated Depreciation	10,329,485
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	56,706,141
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	10,329,485
Operating Properties [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lehigh, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,008,569
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,398,815
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	21,928,341
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,734,826
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	20,592,330
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,327,156
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,602,697
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	28,327,156
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,602,697
Operating Properties [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lithia Springs, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	445,493
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,160,616
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	558,420
Real Estate and Accumulated Depreciation, Carrying Amount of Land	445,493
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,719,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,164,529
Real Estate and Accumulated Depreciation, Accumulated Depreciation	451,773
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,164,529
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	451,773
Operating Properties [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lower Macungie, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,603,460
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,807,987
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,434,039
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,603,460
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	21,242,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,845,486
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,675,692
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,845,486
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,675,692
Operating Properties [Member] | 1 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,600,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,322,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land	406,421
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,916,028
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,322,449
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,920,320
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,322,449
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,920,320
Operating Properties [Member] | 1 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	419,460
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,792,570
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,457,280
Real Estate and Accumulated Depreciation, Carrying Amount of Land	419,460
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,249,850
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,669,310
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,184,617
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,669,310
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,184,617
Operating Properties [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	823,540
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,341,376
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	459,973
Real Estate and Accumulated Depreciation, Carrying Amount of Land	832,244
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,792,645
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,624,889
Real Estate and Accumulated Depreciation, Accumulated Depreciation	661,691
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,624,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	661,691
Operating Properties [Member] | 10 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	509,075
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,699,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land	509,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,698,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,208,316
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,859,067
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,208,316
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,859,067
Operating Properties [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	724,058
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,944,127
Real Estate and Accumulated Depreciation, Carrying Amount of Land	724,846
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,943,339
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,668,185
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,677,124
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,668,185
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,677,124
Operating Properties [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,320,625
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,509,345
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,977,935
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,852,035
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,829,970
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,504,664
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,829,970
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,504,664
Operating Properties [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,436,814
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	16,319,176
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,676,470
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,079,520
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,755,990
Real Estate and Accumulated Depreciation, Accumulated Depreciation	8,046,092
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,755,990
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	8,046,092
Operating Properties [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	496,297
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,962,685
Real Estate and Accumulated Depreciation, Carrying Amount of Land	708,331
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,750,651
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,458,982
Real Estate and Accumulated Depreciation, Accumulated Depreciation	956,089
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,458,982
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	956,089
Operating Properties [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,837,050
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,960,110
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,837,878
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,959,282
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,797,160
Real Estate and Accumulated Depreciation, Accumulated Depreciation	11,823,804
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,797,160
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	11,823,804
Operating Properties [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	130,689
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,326,294
Real Estate and Accumulated Depreciation, Carrying Amount of Land	128,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,328,216
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,456,983
Real Estate and Accumulated Depreciation, Accumulated Depreciation	943,797
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,456,983
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	943,797
Operating Properties [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	664,282
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,829,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land	643,892
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,850,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,493,989
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,799,033
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,493,989
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,799,033
Operating Properties [Member] | 155 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	625,147
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,640,082
Real Estate and Accumulated Depreciation, Carrying Amount of Land	626,068
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,639,161
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,265,229
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,021,418
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,265,229
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,021,418
Operating Properties [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	394,036
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,976,221
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	68,969
Real Estate and Accumulated Depreciation, Carrying Amount of Land	397,293
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,041,933
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,439,226
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,604,030
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,439,226
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,604,030
Operating Properties [Member] | 2 West Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,405,041
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,905,100
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,405,042
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,905,099
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,310,141
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,553,154
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,310,141
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,553,154
Operating Properties [Member] | 20 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	465,539
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,376,881
Real Estate and Accumulated Depreciation, Carrying Amount of Land	466,413
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,376,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,842,420
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,639,774
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,842,420
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,639,774
Operating Properties [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	495,893
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,739,093
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	692,113
Real Estate and Accumulated Depreciation, Carrying Amount of Land	812,745
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,114,354
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,927,099
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,480,908
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,927,099
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,480,908
Operating Properties [Member] | 257-275 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	504,611
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,074,448
Real Estate and Accumulated Depreciation, Carrying Amount of Land	505,458
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,073,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,579,059
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,594,060
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,579,059
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,594,060
Operating Properties [Member] | 27-43 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	448,775
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,409,325
Real Estate and Accumulated Depreciation, Carrying Amount of Land	449,447
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,408,653
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,858,100
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,890,813
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1977
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,858,100
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,890,813
Operating Properties [Member] | 277-293 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	530,729
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,341,016
Real Estate and Accumulated Depreciation, Carrying Amount of Land	531,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,340,211
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,871,745
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,602,008
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,871,745
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,602,008
Operating Properties [Member] | 3 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	814,278
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,142,433
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,128,881
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,827,830
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,956,711
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,009,687
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,956,711
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,009,687
Operating Properties [Member] | 30 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	128,126
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	578,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land	128,783
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	578,189
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	706,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation	404,423
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	706,972
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	404,423
Operating Properties [Member] | 300 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	368,626
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,483,233
Real Estate and Accumulated Depreciation, Carrying Amount of Land	374,497
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,477,362
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,851,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation	919,452
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,851,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	919,452
Operating Properties [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	937,212
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,299,779
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,402,795
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,834,196
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,236,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,943,609
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,236,991
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,943,609
Operating Properties [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	397,131
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,710,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land	397,948
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,709,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,107,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,874,760
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,107,637
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,874,760
Operating Properties [Member] | 333 Phoenixville Pike [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	523,530
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,708,843
Real Estate and Accumulated Depreciation, Carrying Amount of Land	524,230
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,708,143
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,232,373
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,402,798
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,232,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,402,798
Operating Properties [Member] | 375 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	191,114
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,625,516
Real Estate and Accumulated Depreciation, Carrying Amount of Land	234,922
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,581,708
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,816,630
Real Estate and Accumulated Depreciation, Accumulated Depreciation	682,324
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,816,630
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	682,324
Operating Properties [Member] | 40 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,241,137
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,737,090
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,964,825
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,241,167
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	20,701,884
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,943,051
Real Estate and Accumulated Depreciation, Accumulated Depreciation	8,848,962
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,943,051
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	8,848,962
Operating Properties [Member] | 40 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	322,918
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,325,030
Real Estate and Accumulated Depreciation, Carrying Amount of Land	325,775
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,322,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,647,948
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,596,173
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,647,948
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,596,173
Operating Properties [Member] | 420 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,054,418
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,897,631
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,055,243
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,896,806
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,952,049
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,686,877
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,952,049
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,686,877
Operating Properties [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,847,501
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	44,772,891
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,953,208
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	38,667,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	48,620,392
Real Estate and Accumulated Depreciation, Accumulated Depreciation	335,169
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	48,620,392
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	335,169
Operating Properties [Member] | 425 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	191,114
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,708,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land	321,473
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,578,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,899,737
Real Estate and Accumulated Depreciation, Accumulated Depreciation	716,843
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,899,737
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	716,843
Operating Properties [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,380,221
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	15,322,821
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,749,748
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,953,294
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	19,703,042
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,549,963
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	19,703,042
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,549,963
Operating Properties [Member] | 45-67 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	795,143
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,811,065
Real Estate and Accumulated Depreciation, Carrying Amount of Land	795,831
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,810,377
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,606,208
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,085,878
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1974
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,606,208
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,085,878
Operating Properties [Member] | 5 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	785,168
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,678,632
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	220,136
Real Estate and Accumulated Depreciation, Carrying Amount of Land	786,235
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,897,701
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,683,936
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,663,371
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,683,936
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,663,371
Operating Properties [Member] | 5 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	684,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,181,661
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,261,679
Real Estate and Accumulated Depreciation, Carrying Amount of Land	684,200
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,443,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,127,540
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,617,433
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,127,540
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,617,433
Operating Properties [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	849,576
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,095,935
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,337,076
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,608,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,945,511
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,831,325
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,945,511
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,831,325
Operating Properties [Member] | 50 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	323,971
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,100,515
Real Estate and Accumulated Depreciation, Carrying Amount of Land	323,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,100,694
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,424,486
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,605,810
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,424,486
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,605,810
Operating Properties [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	472,364
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,162,401
Real Estate and Accumulated Depreciation, Carrying Amount of Land	762,370
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,872,395
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,634,765
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,748,571
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,634,765
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,748,571
Operating Properties [Member] | 508 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	331,392
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,661,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land	332,216
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,660,607
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,992,823
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,174,148
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,992,823
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,174,148
Operating Properties [Member] | 510 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	356,950
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	926,587
Real Estate and Accumulated Depreciation, Carrying Amount of Land	357,751
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	925,786
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,283,537
Real Estate and Accumulated Depreciation, Accumulated Depreciation	745,524
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,283,537
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	745,524
Operating Properties [Member] | 55 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	215,005
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,674,159
Real Estate and Accumulated Depreciation, Carrying Amount of Land	215,818
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,673,346
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,889,164
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,077,100
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,889,164
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,077,100
Operating Properties [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	865,424
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,285,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,182,805
Real Estate and Accumulated Depreciation, Carrying Amount of Land	884,974
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,448,255
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,333,229
Real Estate and Accumulated Depreciation, Accumulated Depreciation	9,348,321
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,333,229
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	9,348,321
Operating Properties [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,013,750
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,218,329
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,798,565
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,433,514
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,232,079
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,134,849
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,232,079
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,134,849
Operating Properties [Member] | 65 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	381,544
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,371,688
Real Estate and Accumulated Depreciation, Carrying Amount of Land	382,361
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,370,871
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,753,232
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,287,217
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1983
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,753,232
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,287,217
Operating Properties [Member] | 7 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	176,435
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,966,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land	177,317
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,965,178
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,142,495
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,382,814
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,142,495
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,382,814
Operating Properties [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,013,750
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,957,984
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,785,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,185,911
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,971,734
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,093,141
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,971,734
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,093,141
Operating Properties [Member] | 75 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	143,074
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	618,372
Real Estate and Accumulated Depreciation, Carrying Amount of Land	143,811
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	617,635
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	761,446
Real Estate and Accumulated Depreciation, Accumulated Depreciation	517,897
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1977
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	761,446
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	517,897
Operating Properties [Member] | 77-123 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	887,664
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,415,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land	888,359
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,414,906
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,303,265
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,973,746
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,303,265
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,973,746
Operating Properties [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Marietta, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,232,219
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,897,326
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	435,643
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,232,219
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,332,969
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	19,565,188
Real Estate and Accumulated Depreciation, Accumulated Depreciation	698,307
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	19,565,188
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	698,307
Operating Properties [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Mauldin, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	557,174
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,854,015
Real Estate and Accumulated Depreciation, Carrying Amount of Land	506,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,904,871
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,411,189
Real Estate and Accumulated Depreciation, Accumulated Depreciation	709,233
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,411,189
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	709,233
Operating Properties [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Mauldin, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	419,731
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,341,542
Real Estate and Accumulated Depreciation, Carrying Amount of Land	430,909
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,330,364
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,761,273
Real Estate and Accumulated Depreciation, Accumulated Depreciation	634,095
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,761,273
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	634,095
Operating Properties [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	McDonough, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	600,666
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,184,131
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	543,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land	600,666
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,727,330
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,327,996
Real Estate and Accumulated Depreciation, Accumulated Depreciation	319,917
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,327,996
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	319,917
Operating Properties [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	McDonough, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	660,420
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,785,127
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	547,148
Real Estate and Accumulated Depreciation, Carrying Amount of Land	660,420
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,332,275
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,992,695
Real Estate and Accumulated Depreciation, Accumulated Depreciation	311,978
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,992,695
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	311,978
Operating Properties [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Medley, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,558,619
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,678,237
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	896,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,558,619
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,575,079
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,133,698
Real Estate and Accumulated Depreciation, Accumulated Depreciation	797,567
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,133,698
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	797,567
Operating Properties [Member] | 3824-3960 Crowfarn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Memphis, TN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	291,223
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,044,953
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	74,204
Real Estate and Accumulated Depreciation, Carrying Amount of Land	291,223
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,119,156
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,410,379
Real Estate and Accumulated Depreciation, Accumulated Depreciation	83,033
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,410,379
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	83,033
Operating Properties [Member] | 12501 & 12701 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minnetonka, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,175,209
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,948,085
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,735,905
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,177,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,681,246
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,859,199
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,995,333
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,859,199
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,995,333
Operating Properties [Member] | 12800 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minnetonka, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,273,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,158,737
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,090,734
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,273,731
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,249,339
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,523,070
Real Estate and Accumulated Depreciation, Accumulated Depreciation	408,984
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,523,070
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	408,984
Operating Properties [Member] | 12900 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minnetonka, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,236,560
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,762,325
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,468,108
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,236,687
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,230,306
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,466,993
Real Estate and Accumulated Depreciation, Accumulated Depreciation	337,484
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,466,993
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	337,484
Operating Properties [Member] | 5400-5500 Feltl Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minnetonka, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	883,895
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,983,345
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,579,074
Real Estate and Accumulated Depreciation, Carrying Amount of Land	883,895
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,562,419
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,446,314
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,883,003
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,446,314
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,883,003
Operating Properties [Member] | 6000 Clearwater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minnetonka, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	985,016
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,091,371
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,503,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land	985,117
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,594,277
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,579,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation	439,175
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,579,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	439,175
Operating Properties [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Minooka, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,862,683
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,357,981
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,801,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,862,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,159,895
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,022,578
Real Estate and Accumulated Depreciation, Accumulated Depreciation	792,052
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,022,578
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	792,052
Operating Properties [Member] | 3100 SW 145th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Miramar, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,204,407
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	16,723,386
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,265,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,662,793
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,927,793
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,643,402
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	22,927,793
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,643,402
Operating Properties [Member] | 3350 SW 148th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Miramar, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,960,511
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,616,594
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,980,689
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,596,416
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,577,105
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,988,133
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,577,105
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,988,133
Operating Properties [Member] | 3400 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Miramar, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,022,153
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,345,881
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,116,685
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,022,153
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,462,566
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,484,719
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,734,572
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,484,719
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,734,572
Operating Properties [Member] | 3450 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Miramar, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,022,152
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,357,143
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,408,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,022,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,765,817
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,787,969
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,526,825
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,787,969
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,526,825
Operating Properties [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Monroe Township, NJ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,097,170
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,715,401
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	560,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,097,170
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,275,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,372,883
Real Estate and Accumulated Depreciation, Accumulated Depreciation	495,630
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,372,883
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	495,630
Operating Properties [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Monroe Township, NJ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,263,153
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,261,759
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	599,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,263,153
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,860,785
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,123,938
Real Estate and Accumulated Depreciation, Accumulated Depreciation	475,968
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,123,938
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	475,968
Operating Properties [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Moreno Valley, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	9,404,283
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,380,934
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,851,865
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,408,276
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	26,228,806
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	35,637,082
Real Estate and Accumulated Depreciation, Accumulated Depreciation	490,170
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	35,637,082
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	490,170
Operating Properties [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Morrisville, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,534,078
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,071,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,397,807
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,028,987
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,071,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,426,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,498,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation	902,673
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,498,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	902,673
Operating Properties [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Morrisville, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,449,092
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,424,932
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	321,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,449,450
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,746,334
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,195,784
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,005,152
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,195,784
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,005,152
Operating Properties [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Morrisville, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,031,430
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,655,167
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	226,631
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,031,685
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,881,543
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,913,228
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,176,421
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,913,228
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,176,421
Operating Properties [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Morrisville, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,061,370
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,152,110
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	595,652
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,061,632
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,747,500
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,809,132
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,220,446
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,809,132
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,220,446
Operating Properties [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Morrisville, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,300,889
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,313,226
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	207,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,301,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,520,088
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,821,299
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,123,136
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,821,299
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,123,136
Operating Properties [Member] | 220 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Newark, DE
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	566,650
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,099,337
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	782,233
Real Estate and Accumulated Depreciation, Carrying Amount of Land	566,650
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,881,570
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,448,220
Real Estate and Accumulated Depreciation, Accumulated Depreciation	287,917
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,448,220
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	287,917
Operating Properties [Member] | 222 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Newark, DE
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,045,238
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,975,553
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	149,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,045,238
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,124,565
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,169,803
Real Estate and Accumulated Depreciation, Accumulated Depreciation	122,058
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,169,803
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	122,058
Operating Properties [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Odenton, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,976,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,099,579
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,469,160
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,011,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,533,709
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,544,739
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,155,743
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,544,739
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,155,743
Operating Properties [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Odenton, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,778,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,289,165
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,074,288
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,809,927
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,331,926
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,141,853
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,561,604
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,141,853
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,561,604
Operating Properties [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Ontario, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,686,533
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,125,772
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	408,877
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,686,533
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,534,649
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,221,182
Real Estate and Accumulated Depreciation, Accumulated Depreciation	437,422
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,221,182
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	437,422
Operating Properties [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	415,906
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,824,930
Real Estate and Accumulated Depreciation, Carrying Amount of Land	435,400
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,805,436
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,240,836
Real Estate and Accumulated Depreciation, Accumulated Depreciation	500,344
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,240,836
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	500,344
Operating Properties [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	680,312
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,120,754
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,343,847
Real Estate and Accumulated Depreciation, Carrying Amount of Land	680,312
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,464,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,144,913
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,132,887
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,144,913
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,132,887
Operating Properties [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	517,554
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,568,186
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	692,668
Real Estate and Accumulated Depreciation, Carrying Amount of Land	522,991
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,255,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,778,408
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,390,788
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,778,408
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,390,788
Operating Properties [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	664,605
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,513,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land	685,383
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,492,235
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,177,618
Real Estate and Accumulated Depreciation, Accumulated Depreciation	768,667
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,177,618
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	768,667
Operating Properties [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	878,320
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,558,833
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,438,037
Real Estate and Accumulated Depreciation, Carrying Amount of Land	878,320
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,996,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,875,190
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,142,230
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,875,190
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,142,230
Operating Properties [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	518,043
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,561,938
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	976,217
Real Estate and Accumulated Depreciation, Carrying Amount of Land	518,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,538,155
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,056,198
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,542,263
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1962
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,056,198
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,542,263
Operating Properties [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	523,512
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,191,790
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,515,373
Real Estate and Accumulated Depreciation, Carrying Amount of Land	538,512
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,692,163
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,230,675
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,952,861
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,230,675
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,952,861
Operating Properties [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	913,201
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,818,610
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	241,819
Real Estate and Accumulated Depreciation, Carrying Amount of Land	913,201
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,060,429
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,973,630
Real Estate and Accumulated Depreciation, Accumulated Depreciation	311,083
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,973,630
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	311,083
Operating Properties [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,283,713
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,181,368
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,283,713
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,181,368
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,465,081
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,501,397
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,465,081
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,501,397
Operating Properties [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	467,296
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,855,024
Real Estate and Accumulated Depreciation, Carrying Amount of Land	825,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,496,647
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,322,320
Real Estate and Accumulated Depreciation, Accumulated Depreciation	656,682
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,322,320
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	656,682
Operating Properties [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,261,924
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,496,249
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,545,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,271,785
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,031,406
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,303,191
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,860,842
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,303,191
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,860,842
Operating Properties [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	385,964
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,215,820
Real Estate and Accumulated Depreciation, Carrying Amount of Land	642,427
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,959,357
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,601,784
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,053,814
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,601,784
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,053,814
Operating Properties [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,236,819
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,243,314
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	708,578
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,244,667
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,944,044
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,188,711
Real Estate and Accumulated Depreciation, Accumulated Depreciation	268,566
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,188,711
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	268,566
Operating Properties [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	535,964
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,830,135
Real Estate and Accumulated Depreciation, Carrying Amount of Land	704,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,661,299
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,366,099
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,020,666
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,366,099
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,020,666
Operating Properties [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,435,301
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,174,642
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	694,147
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,435,301
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,868,789
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,304,090
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,568,189
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,304,090
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,568,189
Operating Properties [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	903,701
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,660,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land	925,671
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,638,790
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,564,461
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,886,420
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,564,461
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,886,420
Operating Properties [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	872,550
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,526,043
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	283,738
Real Estate and Accumulated Depreciation, Carrying Amount of Land	872,550
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,809,781
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,682,331
Real Estate and Accumulated Depreciation, Accumulated Depreciation	132,760
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,682,331
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	132,760
Operating Properties [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	903,701
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,790,427
Real Estate and Accumulated Depreciation, Carrying Amount of Land	830,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,863,175
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,694,128
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,001,454
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,694,128
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,001,454
Operating Properties [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,443,510
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,775,194
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	486,102
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,457,286
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,247,521
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,704,807
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,546,051
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,704,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,546,051
Operating Properties [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,431,489
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,002,539
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	815,640
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,445,807
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,803,861
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,249,668
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,910,017
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,249,668
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,910,017
Operating Properties [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,553,537
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,702,243
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	409,929
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,570,863
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,094,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,665,709
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,305,001
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,665,709
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,305,001
Operating Properties [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,931,697
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,388,203
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,052,761
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,932,004
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,440,657
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,372,661
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,137,431
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,372,661
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,137,431
Operating Properties [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,295,972
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,564,905
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,370,731
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,295,972
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,935,637
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,231,609
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,695,236
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	24,231,609
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,695,236
Operating Properties [Member] | 8201 Chancellor Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	332,992
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,825,284
Real Estate and Accumulated Depreciation, Carrying Amount of Land	373,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,784,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,158,276
Real Estate and Accumulated Depreciation, Accumulated Depreciation	499,506
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,158,276
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	499,506
Operating Properties [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	443,989
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,907,134
Real Estate and Accumulated Depreciation, Carrying Amount of Land	464,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,886,323
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,351,123
Real Estate and Accumulated Depreciation, Accumulated Depreciation	504,060
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,351,123
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	504,060
Operating Properties [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	574,831
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,763,949
Real Estate and Accumulated Depreciation, Carrying Amount of Land	587,319
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,751,461
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,338,780
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,175,031
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,338,780
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,175,031
Operating Properties [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	252,850
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,297,923
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	141,775
Real Estate and Accumulated Depreciation, Carrying Amount of Land	252,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,439,698
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,692,548
Real Estate and Accumulated Depreciation, Accumulated Depreciation	587,158
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,692,548
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	587,158
Operating Properties [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	405,362
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,146,546
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	367,265
Real Estate and Accumulated Depreciation, Carrying Amount of Land	405,362
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,513,811
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,919,173
Real Estate and Accumulated Depreciation, Accumulated Depreciation	602,972
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,919,173
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	602,972
Operating Properties [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	838,853
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,084,540
Real Estate and Accumulated Depreciation, Carrying Amount of Land	767,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,155,440
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,923,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,068,841
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,923,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,068,841
Operating Properties [Member] | 13 Centennial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Peabody, MA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,203,464
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,752,384
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	489,439
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,203,464
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,241,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,445,287
Real Estate and Accumulated Depreciation, Accumulated Depreciation	564,671
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,445,287
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	564,671
Operating Properties [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	567,280
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,532,238
Real Estate and Accumulated Depreciation, Carrying Amount of Land	347,892
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,751,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,099,518
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,320,612
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,099,518
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,320,612
Operating Properties [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	567,531
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	13,999,552
Real Estate and Accumulated Depreciation, Carrying Amount of Land	569,349
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,997,734
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,567,083
Real Estate and Accumulated Depreciation, Accumulated Depreciation	916,894
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,567,083
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	916,894
Operating Properties [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	214,726
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	22,969,180
Real Estate and Accumulated Depreciation, Carrying Amount of Land	417,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,766,083
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,183,906
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,161,332
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,183,906
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,161,332
Operating Properties [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	46,301
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,019,911
Real Estate and Accumulated Depreciation, Carrying Amount of Land	616,670
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,449,542
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,066,212
Real Estate and Accumulated Depreciation, Accumulated Depreciation	532,259
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,066,212
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	532,259
Operating Properties [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	402,673
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	34,847,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land	413,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	34,837,356
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	35,250,386
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,791,398
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	35,250,386
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,791,398
Operating Properties [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	992,965
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	331,924
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,619,754
Real Estate and Accumulated Depreciation, Carrying Amount of Land	613,248
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,331,395
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,944,643
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,283,334
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,944,643
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,283,334
Operating Properties [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	891,892
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,534,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land	366,982
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,059,733
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,426,715
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,140,706
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,426,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,140,706
Operating Properties [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,765,341
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	75,019,430
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,897,303
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	74,887,468
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	76,784,771
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,922,424
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	76,784,771
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,922,424
Operating Properties [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	43,066,058
Real Estate and Accumulated Depreciation, Initial Cost of Land	734,275
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	45,262,758
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	45,997,033
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	45,997,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,390,925
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	45,997,033
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,390,925
Operating Properties [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,519,510
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,798,560
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,422,003
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,519,510
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,220,563
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,740,073
Real Estate and Accumulated Depreciation, Accumulated Depreciation	583,306
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,740,073
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	583,306
Operating Properties [Member] | 4207 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,409,908
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,680,808
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,100,202
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,410,248
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,780,670
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,190,918
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,587,802
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,190,918
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,587,802
Operating Properties [Member] | 4217 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,920,980
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,045,599
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,757,067
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,690,321
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,033,325
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,723,646
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,476,778
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,723,646
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,476,778
Operating Properties [Member] | 4303 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,619,964
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,675,711
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	43,651
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,619,964
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,719,362
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,339,326
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,134,793
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,339,326
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,134,793
Operating Properties [Member] | 4313 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,895,539
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,724,283
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,467,793
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,895,539
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,192,076
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,087,615
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,356,375
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	22,087,615
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,356,375
Operating Properties [Member] | 4405 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,646,318
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,697,439
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	841,102
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,646,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,538,541
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,184,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,256,929
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,184,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,256,929
Operating Properties [Member] | 4410 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,758,484
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,559,563
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,592,969
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,765,172
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,145,844
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,911,016
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,912,801
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,911,016
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,912,801
Operating Properties [Member] | 4415 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,749,957
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,667,748
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	465,844
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,749,957
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,133,592
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,883,549
Real Estate and Accumulated Depreciation, Accumulated Depreciation	976,217
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,883,549
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	976,217
Operating Properties [Member] | 4425 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	7,318,457
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,549,401
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	-413,426
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,318,457
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,135,975
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,454,432
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,581,188
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	31,454,432
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,581,188
Operating Properties [Member] | 4435 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,910,584
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,954,020
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,166,648
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,911,045
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,120,208
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,031,253
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,223,552
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,031,253
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,223,552
Operating Properties [Member] | 4450 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,380,972
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,257,593
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,391,283
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,247,282
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,638,565
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,562,671
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,638,565
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,562,671
Operating Properties [Member] | 4610 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,539,310
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,331,533
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,827,288
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,043,555
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,870,843
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,077,725
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,870,843
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,077,725
Operating Properties [Member] | 4750 S. 44th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,756,307
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,336,400
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,190,610
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,761,587
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,521,730
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,283,317
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,536,167
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,283,317
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,536,167
Operating Properties [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,523,427
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,581,705
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,217,040
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,636,070
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,686,102
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,322,172
Real Estate and Accumulated Depreciation, Accumulated Depreciation	844,574
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	28,322,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	844,574
Operating Properties [Member] | 9801 South 51st Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,225,839
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,059,235
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,396,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,225,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,455,307
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,681,146
Real Estate and Accumulated Depreciation, Accumulated Depreciation	510,995
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,681,146
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	510,995
Operating Properties [Member] | Cotton Center Building 18 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	11,222,938
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	15,263,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,318,033
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	15,168,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,486,217
Real Estate and Accumulated Depreciation, Accumulated Depreciation	844,115
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,486,217
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	844,115
Operating Properties [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	706,660
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,894,330
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	248,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land	706,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,142,391
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,849,051
Real Estate and Accumulated Depreciation, Accumulated Depreciation	254,236
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,849,051
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	254,236
Operating Properties [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	555,168
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,401,789
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	379,756
Real Estate and Accumulated Depreciation, Carrying Amount of Land	555,168
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,781,545
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,336,713
Real Estate and Accumulated Depreciation, Accumulated Depreciation	306,374
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,336,713
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	306,374
Operating Properties [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	551,706
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,797,440
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	312,150
Real Estate and Accumulated Depreciation, Carrying Amount of Land	551,706
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,109,590
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,661,296
Real Estate and Accumulated Depreciation, Accumulated Depreciation	291,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,661,296
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	291,732
Operating Properties [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,047,996
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,218,748
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	360,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,047,996
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,578,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,626,756
Real Estate and Accumulated Depreciation, Accumulated Depreciation	408,139
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,626,756
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	408,139
Operating Properties [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	877,564
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,460,686
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	334,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land	877,564
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,795,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,673,165
Real Estate and Accumulated Depreciation, Accumulated Depreciation	339,796
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,673,165
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	339,796
Operating Properties [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	580,456
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,681,283
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	271,462
Real Estate and Accumulated Depreciation, Carrying Amount of Land	580,456
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,952,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,533,201
Real Estate and Accumulated Depreciation, Accumulated Depreciation	258,314
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,533,201
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	258,314
Operating Properties [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plano, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	723,534
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,004,923
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	349,690
Real Estate and Accumulated Depreciation, Carrying Amount of Land	723,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,354,613
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,078,147
Real Estate and Accumulated Depreciation, Accumulated Depreciation	287,366
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,078,147
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	287,366
Operating Properties [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pleasant Prairie, WI
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,692,077
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,934,794
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	336,795
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,689,726
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,273,940
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,963,666
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,403,243
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1994
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,963,666
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,403,243
Operating Properties [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Plymouth, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	198,205
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,793,422
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	965,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land	198,205
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,759,172
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,957,377
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,165,832
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,957,377
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,165,832
Operating Properties [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,112,781
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,763,862
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	199,220
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,112,781
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,963,081
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,075,862
Real Estate and Accumulated Depreciation, Accumulated Depreciation	130,093
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,075,862
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	130,093
Operating Properties [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	359,933
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,437,116
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	720,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land	359,933
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,157,365
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,517,298
Real Estate and Accumulated Depreciation, Accumulated Depreciation	949,834
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,517,298
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	949,834
Operating Properties [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	164,413
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	655,933
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	279,326
Real Estate and Accumulated Depreciation, Carrying Amount of Land	164,413
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	935,259
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,099,672
Real Estate and Accumulated Depreciation, Accumulated Depreciation	463,027
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,099,672
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	463,027
Operating Properties [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Pompano Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	310,778
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,238,324
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	421,172
Real Estate and Accumulated Depreciation, Carrying Amount of Land	310,178
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,660,096
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,970,274
Real Estate and Accumulated Depreciation, Accumulated Depreciation	703,981
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1965
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,970,274
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	703,981
Operating Properties [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rialto, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	9,361,943
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,970,709
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	149,839
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,413,332
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,069,159
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	27,482,491
Real Estate and Accumulated Depreciation, Accumulated Depreciation	60,280
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	27,482,491
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	60,280
Operating Properties [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	659,456
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,836,010
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	159,898
Real Estate and Accumulated Depreciation, Carrying Amount of Land	659,456
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,995,908
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,655,364
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,504,321
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,655,364
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,504,321
Operating Properties [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	310,854
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,279,597
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,094,160
Real Estate and Accumulated Depreciation, Carrying Amount of Land	310,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,373,757
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,684,611
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,641,297
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1973
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,684,611
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,641,297
Operating Properties [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	693,203
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,083,493
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,937,811
Real Estate and Accumulated Depreciation, Carrying Amount of Land	693,203
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,021,304
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,714,507
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,545,615
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,714,507
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,545,615
Operating Properties [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	256,203
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,549,649
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,213,314
Real Estate and Accumulated Depreciation, Carrying Amount of Land	256,203
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,762,963
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,019,166
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,149,744
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1976
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,019,166
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,149,744
Operating Properties [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	91,476
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,884,374
Real Estate and Accumulated Depreciation, Carrying Amount of Land	91,599
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,884,251
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,975,850
Real Estate and Accumulated Depreciation, Accumulated Depreciation	862,218
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,975,850
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	862,218
Operating Properties [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	223,696
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,640,435
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,738,782
Real Estate and Accumulated Depreciation, Carrying Amount of Land	223,696
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,379,217
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,602,913
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,701,198
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,602,913
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,701,198
Operating Properties [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	325,303
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,385,557
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,430,286
Real Estate and Accumulated Depreciation, Carrying Amount of Land	325,303
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,815,843
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,141,146
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,930,047
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,141,146
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,930,047
Operating Properties [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	615,038
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,510,272
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	506,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	615,038
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,017,114
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,632,152
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,486,608
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,632,152
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,486,608
Operating Properties [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	454,056
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,729,742
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	446,660
Real Estate and Accumulated Depreciation, Carrying Amount of Land	454,056
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,176,402
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,630,458
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,665,452
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,630,458
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,665,452
Operating Properties [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	486,166
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,565,211
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	553,422
Real Estate and Accumulated Depreciation, Carrying Amount of Land	486,166
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,118,633
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,604,799
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,015,290
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,604,799
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,015,290
Operating Properties [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	474,360
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,478,646
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	984,318
Real Estate and Accumulated Depreciation, Carrying Amount of Land	474,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,462,964
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,937,324
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,268,592
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,937,324
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,268,592
Operating Properties [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	652,455
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,784,675
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	794,310
Real Estate and Accumulated Depreciation, Carrying Amount of Land	652,455
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,578,985
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,231,440
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,970,780
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,231,440
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,970,780
Operating Properties [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	404,616
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,967,187
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	541,284
Real Estate and Accumulated Depreciation, Carrying Amount of Land	404,616
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,508,471
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,913,087
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,739,814
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,913,087
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,739,814
Operating Properties [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	449,447
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,294,697
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,230,770
Real Estate and Accumulated Depreciation, Carrying Amount of Land	452,263
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,522,651
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,974,914
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,518,602
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,974,914
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,518,602
Operating Properties [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	261,961
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,110,874
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	381,903
Real Estate and Accumulated Depreciation, Carrying Amount of Land	262,210
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,492,528
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,754,738
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,179,196
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,754,738
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,179,196
Operating Properties [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	486,118
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,083,582
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	703,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land	486,598
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,786,533
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,273,131
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,068,460
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,273,131
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,068,460
Operating Properties [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	266,883
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,599,777
Real Estate and Accumulated Depreciation, Carrying Amount of Land	334,772
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,531,888
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,866,660
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,085,121
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,866,660
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,085,121
Operating Properties [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	742,300
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,415,233
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,066,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,090,694
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,157,533
Real Estate and Accumulated Depreciation, Accumulated Depreciation	901,938
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,157,533
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	901,938
Operating Properties [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	489,941
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,592,900
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	595,652
Real Estate and Accumulated Depreciation, Carrying Amount of Land	489,941
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,188,552
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,678,493
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,923,946
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,678,493
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,923,946
Operating Properties [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	705,660
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,921,067
Real Estate and Accumulated Depreciation, Carrying Amount of Land	720,100
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,906,627
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,626,727
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,395,221
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,626,727
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,395,221
Operating Properties [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	644,384
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,025,480
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	353,257
Real Estate and Accumulated Depreciation, Carrying Amount of Land	644,384
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,378,737
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,023,121
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,149,329
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,023,121
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,149,329
Operating Properties [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	408,729
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,697,348
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	748,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land	408,729
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,445,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,854,346
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,921,311
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,854,346
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,921,311
Operating Properties [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	694,644
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,983,122
Real Estate and Accumulated Depreciation, Carrying Amount of Land	700,503
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,977,263
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,677,766
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,290,808
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,677,766
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,290,808
Operating Properties [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	676,661
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,988,588
Real Estate and Accumulated Depreciation, Carrying Amount of Land	687,898
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,977,351
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,665,249
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,353,402
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,665,249
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,353,402
Operating Properties [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	872,901
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,486,258
Real Estate and Accumulated Depreciation, Carrying Amount of Land	901,666
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,457,493
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,359,159
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,273,473
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,359,159
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,273,473
Operating Properties [Member] | 2020 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Riverview, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,233,639
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,608,485
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	341,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,233,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,949,759
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,183,559
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,112,479
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,183,559
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,112,479
Operating Properties [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rock Creek, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	305,821
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,967,815
Real Estate and Accumulated Depreciation, Carrying Amount of Land	335,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,938,575
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,273,636
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,973,748
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,273,636
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,973,748
Operating Properties [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rock Creek, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	354,903
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,017,099
Real Estate and Accumulated Depreciation, Carrying Amount of Land	399,988
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,972,014
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,372,002
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,752,125
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,372,002
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,752,125
Operating Properties [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rogers, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	895,811
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,004,189
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	645,566
Real Estate and Accumulated Depreciation, Carrying Amount of Land	895,811
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,649,755
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,545,566
Real Estate and Accumulated Depreciation, Accumulated Depreciation	857,364
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,545,566
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	857,364
Operating Properties [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rogers, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	508,532
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,083,540
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,396,324
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,195,748
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,592,072
Real Estate and Accumulated Depreciation, Accumulated Depreciation	282,319
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,592,072
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	282,319
Operating Properties [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Rogers, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,048,093
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,389,897
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,066,159
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,371,831
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,437,990
Real Estate and Accumulated Depreciation, Accumulated Depreciation	167,178
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,437,990
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	167,178
Operating Properties [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Romeoville, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,672,143
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,144,864
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	870,108
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,672,143
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	25,014,972
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	33,687,115
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,258,059
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	33,687,115
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,258,059
Operating Properties [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Roselle, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,884,492
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,439,793
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	484,562
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,884,492
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,924,355
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,808,847
Real Estate and Accumulated Depreciation, Accumulated Depreciation	517,282
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,808,847
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	517,282
Operating Properties [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	San Fernando, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,035,034
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,844,962
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	460,618
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,035,034
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,305,580
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,340,614
Real Estate and Accumulated Depreciation, Accumulated Depreciation	136,765
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,340,614
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	136,765
Operating Properties [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Savage, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,263,237
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,633,210
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	99,509
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,263,237
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,732,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,995,956
Real Estate and Accumulated Depreciation, Accumulated Depreciation	116,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,995,956
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	116,732
Operating Properties [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Scottsdale, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,076,412
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	27,621,159
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,115,137
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,582,434
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,697,571
Real Estate and Accumulated Depreciation, Accumulated Depreciation	7,982,111
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	31,697,571
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	7,982,111
Operating Properties [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Shakopee, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,126,865
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,684,178
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,126,865
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,684,178
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,811,043
Real Estate and Accumulated Depreciation, Accumulated Depreciation	320,809
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,811,043
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	320,809
Operating Properties [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Shakopee, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	887,285
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,321,200
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	206,165
Real Estate and Accumulated Depreciation, Carrying Amount of Land	887,285
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,527,365
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,414,650
Real Estate and Accumulated Depreciation, Accumulated Depreciation	332,861
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,414,650
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	332,861
Operating Properties [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sharonville, OH
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,337,271
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,135,118
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	489,270
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,337,271
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,624,389
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,961,660
Real Estate and Accumulated Depreciation, Accumulated Depreciation	601,653
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,961,660
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	601,653
Operating Properties [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Shippensburg, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	10,232,633
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	84,019,815
Real Estate and Accumulated Depreciation, Carrying Amount of Land	13,183,027
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	81,069,421
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	94,252,448
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,152,144
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	94,252,448
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,152,144
Operating Properties [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Simi Valley, CA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,964,140
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,667,267
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	345,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,964,140
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,012,956
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,977,096
Real Estate and Accumulated Depreciation, Accumulated Depreciation	431,004
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,977,096
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	431,004
Operating Properties [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Charles, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	643,639
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,645,058
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	141,970
Real Estate and Accumulated Depreciation, Carrying Amount of Land	643,639
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,787,028
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,430,667
Real Estate and Accumulated Depreciation, Accumulated Depreciation	94,498
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,430,667
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	94,498
Operating Properties [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Charles, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	672,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,288,924
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	117,765
Real Estate and Accumulated Depreciation, Carrying Amount of Land	672,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,406,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,079,189
Real Estate and Accumulated Depreciation, Accumulated Depreciation	79,036
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,079,189
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	79,036
Operating Properties [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Charles, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	851,080
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,027,753
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	149,571
Real Estate and Accumulated Depreciation, Carrying Amount of Land	851,080
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,177,324
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,028,404
Real Estate and Accumulated Depreciation, Accumulated Depreciation	148,467
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,028,404
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	148,467
Operating Properties [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Petersburg, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	283,474
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,230,868
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	165,205
Real Estate and Accumulated Depreciation, Carrying Amount of Land	283,474
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,396,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,679,546
Real Estate and Accumulated Depreciation, Accumulated Depreciation	100,561
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,679,546
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	100,561
Operating Properties [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Petersburg, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	374,284
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,987,226
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	207,177
Real Estate and Accumulated Depreciation, Carrying Amount of Land	374,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,194,403
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,568,687
Real Estate and Accumulated Depreciation, Accumulated Depreciation	133,429
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,568,687
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	133,429
Operating Properties [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	St. Petersburg, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	699,797
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,214,438
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	540,106
Real Estate and Accumulated Depreciation, Carrying Amount of Land	699,797
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,754,544
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,454,341
Real Estate and Accumulated Depreciation, Accumulated Depreciation	228,445
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,454,341
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	228,445
Operating Properties [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Suffolk, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	904,052
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,778,897
Real Estate and Accumulated Depreciation, Carrying Amount of Land	807,006
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,875,943
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,682,949
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,004,053
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,682,949
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,004,053
Operating Properties [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Suffolk, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	603,391
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,707,341
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,628,635
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,682,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,310,732
Real Estate and Accumulated Depreciation, Accumulated Depreciation	383,147
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,310,732
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	383,147
Operating Properties [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Suffolk, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	929,844
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,499,290
Real Estate and Accumulated Depreciation, Carrying Amount of Land	794,848
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,634,286
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,429,134
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,539,151
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,429,134
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,539,151
Operating Properties [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sumner, WA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,675,402
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,079,543
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	301,095
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,675,402
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,380,638
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,056,040
Real Estate and Accumulated Depreciation, Accumulated Depreciation	289,202
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,056,040
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	289,202
Operating Properties [Member] | 1301 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sunrise, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,100,162
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,219,956
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,125,865
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,100,791
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	31,345,192
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	36,445,983
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,226,037
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	36,445,983
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,226,037
Operating Properties [Member] | 13621 NW 12th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sunrise, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,570,820
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,454,900
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,667,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,570,820
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,122,164
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,692,984
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,493,510
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,692,984
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,493,510
Operating Properties [Member] | 13630 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sunrise, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	659,797
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,596,275
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	455,772
Real Estate and Accumulated Depreciation, Carrying Amount of Land	659,825
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,052,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,711,843
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,212,332
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1991
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,711,843
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,212,332
Operating Properties [Member] | 13650 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sunrise, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	558,223
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,171,930
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	321,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land	558,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,493,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,051,920
Real Estate and Accumulated Depreciation, Accumulated Depreciation	999,846
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1991
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,051,920
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	999,846
Operating Properties [Member] | 111 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	359,540
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,461,850
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,582,199
Real Estate and Accumulated Depreciation, Carrying Amount of Land	359,540
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,044,049
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,403,589
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,069,477
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,403,589
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,069,477
Operating Properties [Member] | 131 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	511,463
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,437,886
Real Estate and Accumulated Depreciation, Carrying Amount of Land	559,527
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,389,822
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,949,349
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,531,005
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,949,349
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,531,005
Operating Properties [Member] | 150-182 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	403,541
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,260,899
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,181,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,482,831
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,664,440
Real Estate and Accumulated Depreciation, Accumulated Depreciation	848,617
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,664,440
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	848,617
Operating Properties [Member] | 200-34 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	330,097
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,385,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land	933,362
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,782,067
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,715,429
Real Estate and Accumulated Depreciation, Accumulated Depreciation	638,646
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,715,429
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	638,646
Operating Properties [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	503,767
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,787,585
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,308,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land	503,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,096,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,600,198
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,982,773
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,600,198
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,982,773
Operating Properties [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	556,952
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,849,236
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,948
Real Estate and Accumulated Depreciation, Carrying Amount of Land	556,952
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,852,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,409,136
Real Estate and Accumulated Depreciation, Accumulated Depreciation	203,074
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,409,136
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	203,074
Operating Properties [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	201,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,263,131
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	50,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land	201,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,313,273
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,514,873
Real Estate and Accumulated Depreciation, Accumulated Depreciation	70,591
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,514,873
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	70,591
Operating Properties [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	936,336
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,155,520
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,313
Real Estate and Accumulated Depreciation, Carrying Amount of Land	936,336
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,156,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,093,169
Real Estate and Accumulated Depreciation, Accumulated Depreciation	413,118
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,093,169
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	413,118
Operating Properties [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	650,384
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,764,301
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	32,287
Real Estate and Accumulated Depreciation, Carrying Amount of Land	650,384
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,796,588
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,446,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation	262,219
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,446,972
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	262,219
Operating Properties [Member] | 4502 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,035,422
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,547,955
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,071,535
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,511,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,583,377
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,386,489
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,583,377
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,386,489
Operating Properties [Member] | 4503 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	619,913
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,751,187
Real Estate and Accumulated Depreciation, Carrying Amount of Land	619,913
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,751,187
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,371,100
Real Estate and Accumulated Depreciation, Accumulated Depreciation	925,297
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,371,100
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	925,297
Operating Properties [Member] | 4505 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	516,594
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,443,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land	716,594
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,243,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,960,032
Real Estate and Accumulated Depreciation, Accumulated Depreciation	864,064
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,960,032
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	864,064
Operating Properties [Member] | 4508 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	498,598
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,307,705
Real Estate and Accumulated Depreciation, Carrying Amount of Land	556,887
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,249,416
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,806,303
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,221,367
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,806,303
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,221,367
Operating Properties [Member] | 4511 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	516,594
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,311,508
Real Estate and Accumulated Depreciation, Carrying Amount of Land	686,594
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,141,508
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,828,102
Real Estate and Accumulated Depreciation, Accumulated Depreciation	718,070
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,828,102
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	718,070
Operating Properties [Member] | 4520 Seedling Circle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	854,797
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	42,131
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,773,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land	854,797
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,815,395
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,670,192
Real Estate and Accumulated Depreciation, Accumulated Depreciation	745,181
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,670,192
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	745,181
Operating Properties [Member] | 4630 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	943,169
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,177,882
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,560,099
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,560,952
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,121,051
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,177,038
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,121,051
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,177,038
Operating Properties [Member] | 4631 Woodland Corporate Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,453,367
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	13,806,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,908,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,350,817
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,259,609
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,062,168
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,259,609
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,062,168
Operating Properties [Member] | 501 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	898,884
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,438,023
Real Estate and Accumulated Depreciation, Carrying Amount of Land	900,508
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,436,399
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,336,907
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,056,691
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,336,907
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,056,691
Operating Properties [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	952,860
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,472,043
Real Estate and Accumulated Depreciation, Carrying Amount of Land	952,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,472,043
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,424,903
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,409,987
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,424,903
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,409,987
Operating Properties [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	162,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,613,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	974,528
Real Estate and Accumulated Depreciation, Carrying Amount of Land	262,416
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,487,112
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,749,528
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,199,849
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,749,528
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,199,849
Operating Properties [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	181,923
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,812,496
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,024,573
Real Estate and Accumulated Depreciation, Carrying Amount of Land	181,923
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,837,069
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,018,992
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,089,555
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,018,992
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,089,555
Operating Properties [Member] | 701-725 South US Hwy 301 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	419,683
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,932,756
Real Estate and Accumulated Depreciation, Carrying Amount of Land	661,680
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,690,759
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,352,439
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,389,384
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,352,439
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,389,384
Operating Properties [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	716,580
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	132,773
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	605,762
Real Estate and Accumulated Depreciation, Carrying Amount of Land	447,498
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,007,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,455,115
Real Estate and Accumulated Depreciation, Accumulated Depreciation	287,125
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,455,115
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	287,125
Operating Properties [Member] | 7724 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	235,893
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,247,071
Real Estate and Accumulated Depreciation, Carrying Amount of Land	235,894
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,247,070
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,482,964
Real Estate and Accumulated Depreciation, Accumulated Depreciation	850,183
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,482,964
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	850,183
Operating Properties [Member] | 7725 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	553,335
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,723,937
Real Estate and Accumulated Depreciation, Carrying Amount of Land	771,501
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,505,771
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,277,272
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,280,776
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,277,272
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,280,776
Operating Properties [Member] | 7802-50 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	357,364
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,061,920
Real Estate and Accumulated Depreciation, Carrying Amount of Land	506,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,912,335
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,419,284
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,069,963
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,419,284
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,069,963
Operating Properties [Member] | 7851-7861 Woodland Center Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	548,905
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,241,627
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	273,640
Real Estate and Accumulated Depreciation, Carrying Amount of Land	548,905
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,515,267
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,064,172
Real Estate and Accumulated Depreciation, Accumulated Depreciation	603,840
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,064,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	603,840
Operating Properties [Member] | 7852-98 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	357,364
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,773,785
Real Estate and Accumulated Depreciation, Carrying Amount of Land	506,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,624,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,131,149
Real Estate and Accumulated Depreciation, Accumulated Depreciation	934,043
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,131,149
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	934,043
Operating Properties [Member] | 7920 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,082,648
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,445,444
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	434,554
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,082,648
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,879,998
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,962,646
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,134,463
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,962,646
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,134,463
Operating Properties [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,408,478
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,247,246
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,124,428
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,408,478
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,371,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,780,152
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,846,537
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,780,152
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,846,537
Operating Properties [Member] | 8001 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	350,406
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,298,881
Real Estate and Accumulated Depreciation, Carrying Amount of Land	438,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,211,226
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,649,287
Real Estate and Accumulated Depreciation, Accumulated Depreciation	862,026
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,649,287
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	862,026
Operating Properties [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	912,663
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,425,143
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	261,295
Real Estate and Accumulated Depreciation, Carrying Amount of Land	912,663
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,686,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,599,101
Real Estate and Accumulated Depreciation, Accumulated Depreciation	310,710
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,599,101
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	310,710
Operating Properties [Member] | 8112-42 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	513,263
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,230,239
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	649,274
Real Estate and Accumulated Depreciation, Carrying Amount of Land	513,263
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,879,513
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,392,776
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,910,874
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,392,776
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,910,874
Operating Properties [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	655,668
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,132,076
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	63,891
Real Estate and Accumulated Depreciation, Carrying Amount of Land	655,668
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,195,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,851,635
Real Estate and Accumulated Depreciation, Accumulated Depreciation	267,542
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,851,635
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	267,542
Operating Properties [Member] | 8154-8198 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	399,088
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,868,834
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	899,472
Real Estate and Accumulated Depreciation, Carrying Amount of Land	399,088
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,768,306
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,167,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,627,975
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,167,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,627,975
Operating Properties [Member] | 8212 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	820,882
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,322,720
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	488,973
Real Estate and Accumulated Depreciation, Carrying Amount of Land	820,882
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,811,693
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,632,575
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,045,591
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,632,575
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,045,591
Operating Properties [Member] | 8401-8408 Benjamin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	789,651
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,454,648
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	301,268
Real Estate and Accumulated Depreciation, Carrying Amount of Land	611,626
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,933,941
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,545,567
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,599,279
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,545,567
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,599,279
Operating Properties [Member] | 8705 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,303,870
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,688,409
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	306,814
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,304,102
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,994,992
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,299,094
Real Estate and Accumulated Depreciation, Accumulated Depreciation	6,074,130
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	28,299,094
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	6,074,130
Operating Properties [Member] | 8715 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,343,910
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,325,599
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	487,389
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,344,090
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,812,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,156,898
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,458,387
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	22,156,898
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,458,387
Operating Properties [Member] | 8725 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,167,787
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,126,318
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	632,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,167,958
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	19,758,347
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,926,305
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,503,373
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	22,926,305
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,503,373
Operating Properties [Member] | 8735 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,166,130
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,735,573
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,292,137
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,166,300
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	20,027,540
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,193,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation	5,508,513
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,193,840
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	5,508,513
Operating Properties [Member] | 8745 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,050,439
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,173,008
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	93,869
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,050,548
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,266,768
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,317,316
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,293,301
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,317,316
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,293,301
Operating Properties [Member] | 8900-34 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	537,194
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,962,378
Real Estate and Accumulated Depreciation, Carrying Amount of Land	978,019
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,521,553
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,499,572
Real Estate and Accumulated Depreciation, Accumulated Depreciation	951,035
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,499,572
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	951,035
Operating Properties [Member] | 8921 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	224,369
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,063,882
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	939,473
Real Estate and Accumulated Depreciation, Carrying Amount of Land	254,493
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,973,231
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,227,724
Real Estate and Accumulated Depreciation, Accumulated Depreciation	777,596
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,227,724
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	777,596
Operating Properties [Member] | 9001-9015 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	209,841
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,811,678
Real Estate and Accumulated Depreciation, Carrying Amount of Land	364,514
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,657,005
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,021,519
Real Estate and Accumulated Depreciation, Accumulated Depreciation	744,344
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,021,519
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	744,344
Operating Properties [Member] | 9002-9036 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	492,320
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,511,381
Real Estate and Accumulated Depreciation, Carrying Amount of Land	899,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,104,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,003,701
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,109,566
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,003,701
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,109,566
Operating Properties [Member] | 901-933 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	500,391
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,254,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land	840,314
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,914,250
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,754,564
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,671,876
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,754,564
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,671,876
Operating Properties [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,718,496
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,697,381
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	872,478
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,718,496
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,569,859
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,288,355
Real Estate and Accumulated Depreciation, Accumulated Depreciation	669,758
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,288,355
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	669,758
Operating Properties [Member] | 910-926 Chad Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	201,771
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,616,963
Real Estate and Accumulated Depreciation, Carrying Amount of Land	628,237
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,190,497
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,818,734
Real Estate and Accumulated Depreciation, Accumulated Depreciation	412,480
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,818,734
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	412,480
Operating Properties [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,203,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,979,540
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	221,983
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,203,200
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,201,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,404,723
Real Estate and Accumulated Depreciation, Accumulated Depreciation	492,958
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,404,723
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	492,958
Operating Properties [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	754,832
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,966,864
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	92,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land	754,832
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,059,113
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,813,945
Real Estate and Accumulated Depreciation, Accumulated Depreciation	405,712
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,813,945
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	405,712
Operating Properties [Member] | 9306-24 East Broadway Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	450,440
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,303,369
Real Estate and Accumulated Depreciation, Carrying Amount of Land	486,004
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,267,805
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,753,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation	565,618
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,753,809
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	565,618
Operating Properties [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	612,536
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,168,473
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,700
Real Estate and Accumulated Depreciation, Carrying Amount of Land	612,536
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,178,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,790,709
Real Estate and Accumulated Depreciation, Accumulated Depreciation	224,848
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,790,709
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	224,848
Operating Properties [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	374,548
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,354,800
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	128,373
Real Estate and Accumulated Depreciation, Carrying Amount of Land	374,548
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,483,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,857,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation	79,076
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,857,721
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	79,076
Operating Properties [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,134,286
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,241,807
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	380,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,134,286
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,622,639
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,756,925
Real Estate and Accumulated Depreciation, Accumulated Depreciation	404,236
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,756,925
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	404,236
Operating Properties [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	877,611
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,485,427
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	190,934
Real Estate and Accumulated Depreciation, Carrying Amount of Land	877,611
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,676,361
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,553,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation	215,576
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,553,972
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	215,576
Operating Properties [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,112,245
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,260,348
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	134,556
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,112,245
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,394,904
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,507,149
Real Estate and Accumulated Depreciation, Accumulated Depreciation	124,956
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,507,149
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	124,956
Operating Properties [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,192,820
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,580,155
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	477,881
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,192,820
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,058,037
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,250,857
Real Estate and Accumulated Depreciation, Accumulated Depreciation	215,318
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,250,857
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	215,318
Operating Properties [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tolleson, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,295,090
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,079,811
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,224,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,295,090
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,303,908
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,598,998
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,172,179
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	14,598,998
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,172,179
Operating Properties [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tolleson, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,574,912
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,308,021
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	274,301
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,574,912
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,582,322
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,157,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation	557,915
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,157,234
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	557,915
Operating Properties [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tolleson, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,524,603
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,352,070
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	926,360
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,524,603
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,278,430
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,803,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation	596,068
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,803,033
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	596,068
Operating Properties [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tucker, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	435,776
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,875,685
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	375,872
Real Estate and Accumulated Depreciation, Carrying Amount of Land	435,776
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,251,558
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,687,334
Real Estate and Accumulated Depreciation, Accumulated Depreciation	126,111
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,687,334
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	126,111
Operating Properties [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tucker, GA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	345,061
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,428,840
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	203,538
Real Estate and Accumulated Depreciation, Carrying Amount of Land	345,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,632,378
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,977,439
Real Estate and Accumulated Depreciation, Accumulated Depreciation	105,687
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,977,439
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	105,687
Operating Properties [Member] | 1457 Miller Store Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	473,689
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,663,045
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	376,763
Real Estate and Accumulated Depreciation, Carrying Amount of Land	474,746
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,038,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,513,497
Real Estate and Accumulated Depreciation, Accumulated Depreciation	953,946
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,513,497
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	953,946
Operating Properties [Member] | 200 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,116,693
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,770,480
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,239,720
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,116,693
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,010,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,126,893
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,839,287
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,126,893
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,839,287
Operating Properties [Member] | 208 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	965,177
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,728,717
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,174,995
Real Estate and Accumulated Depreciation, Carrying Amount of Land	965,177
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,903,712
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,868,889
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,840,691
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,868,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,840,691
Operating Properties [Member] | 2809 South Lynnhaven Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	953,590
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,142,742
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,944,512
Real Estate and Accumulated Depreciation, Carrying Amount of Land	953,590
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,087,254
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,040,844
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,219,121
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,040,844
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,219,121
Operating Properties [Member] | 484 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	891,753
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,607,890
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	614,231
Real Estate and Accumulated Depreciation, Carrying Amount of Land	891,753
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,222,120
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,113,873
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,756,749
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,113,873
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,756,749
Operating Properties [Member] | 629 Phoenix Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Virginia Beach, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	371,694
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,108,097
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	224,602
Real Estate and Accumulated Depreciation, Carrying Amount of Land	371,694
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,332,699
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,704,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,022,536
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,704,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,022,536
Operating Properties [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Washington, DC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	16,558,660
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	32,223,978
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,393,698
Real Estate and Accumulated Depreciation, Carrying Amount of Land	16,558,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	33,617,676
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	50,176,336
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,209,304
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	50,176,336
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,209,304
Operating Properties [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Washington, DC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	70,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	55,123,783
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	187,024
Real Estate and Accumulated Depreciation, Carrying Amount of Land	70,000,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	55,310,807
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	125,310,807
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,154,200
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	125,310,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,154,200
Operating Properties [Member] | 1200 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wayne, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,215,667
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,363,338
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,223,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,355,345
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,579,005
Real Estate and Accumulated Depreciation, Accumulated Depreciation	4,284,684
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	15,579,005
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	4,284,684
Operating Properties [Member] | 1500 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wayne, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,287,555
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	32,195,630
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,636,499
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	28,846,687
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	40,483,186
Real Estate and Accumulated Depreciation, Accumulated Depreciation	9,511,047
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	40,483,186
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	9,511,047
Operating Properties [Member] | 825 Duportail Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wayne, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,536,619
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,179,213
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,024,029
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,539,281
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	21,200,581
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,739,862
Real Estate and Accumulated Depreciation, Accumulated Depreciation	8,512,691
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,739,862
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	8,512,691
Operating Properties [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Chester, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	845,846
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,809,025
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	656,822
Real Estate and Accumulated Depreciation, Carrying Amount of Land	845,846
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,465,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,311,694
Real Estate and Accumulated Depreciation, Accumulated Depreciation	3,244,935
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,311,694
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	3,244,935
Operating Properties [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Chester, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	664,899
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,352,410
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	889,805
Real Estate and Accumulated Depreciation, Carrying Amount of Land	664,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,242,216
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,907,115
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,747,719
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,907,115
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,747,719
Operating Properties [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Chicago, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	578,314
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,448,562
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	72,418
Real Estate and Accumulated Depreciation, Carrying Amount of Land	578,314
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,520,981
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,099,295
Real Estate and Accumulated Depreciation, Accumulated Depreciation	98,567
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,099,295
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	98,567
Operating Properties [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Malling, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,288,389
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,705,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,898,275
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,095,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,993,710
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,233,844
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	13,993,710
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,233,844
Operating Properties [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Malling, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,397,739
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	12,477,732
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,232,077
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,643,395
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,875,472
Real Estate and Accumulated Depreciation, Accumulated Depreciation	2,587,023
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,875,472
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	2,587,023
Operating Properties [Member] | Liberty Square Retail Blocks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Malling, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	559,590
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,113,902
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,397,215
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,121,039
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,949,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,070,708
Real Estate and Accumulated Depreciation, Accumulated Depreciation	1,871,518
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,070,708
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,871,518
Operating Properties [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Palm Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,454,972
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,312,829
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	276,501
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,454,972
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,589,331
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,044,303
Real Estate and Accumulated Depreciation, Accumulated Depreciation	293,340
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,044,303
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	293,340
Operating Properties [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Palm Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,177,064
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,102,451
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	125,705
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,177,064
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,228,157
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,405,221
Real Estate and Accumulated Depreciation, Accumulated Depreciation	111,003
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,405,221
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	111,003
Operating Properties [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	West Palm Beach, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,029,595
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,728,187
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	123,734
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,029,595
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,851,922
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,881,517
Real Estate and Accumulated Depreciation, Accumulated Depreciation	84,638
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,881,517
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	84,638
Operating Properties [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Weston, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,682,521
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,905,125
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	558,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,682,521
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	26,463,458
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,145,979
Real Estate and Accumulated Depreciation, Accumulated Depreciation	959,558
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	31,145,979
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	959,558
Operating Properties [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Weston, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,345,242
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,973,765
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	273,455
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,345,242
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,247,221
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,592,463
Real Estate and Accumulated Depreciation, Accumulated Depreciation	510,298
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	16,592,463
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	510,298
Operating Properties [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wheeling, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0	[1]
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,051,093
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,283,479
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	536,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,051,093
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,820,323
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,871,416
Real Estate and Accumulated Depreciation, Accumulated Depreciation	719,097
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,871,416
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	719,097
Operating Properties [Member] | 10 Cornell Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wilmington, MA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	598,120
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,142,735
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	232,897
Real Estate and Accumulated Depreciation, Carrying Amount of Land	598,120
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,375,632
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,973,752
Real Estate and Accumulated Depreciation, Accumulated Depreciation	127,256
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,973,752
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	127,256
Operating Properties [Member] | 265 Ballardvale Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Wilmington, MA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	868,433
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,358,997
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	345,915
Real Estate and Accumulated Depreciation, Carrying Amount of Land	868,433
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,704,913
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,573,346
Real Estate and Accumulated Depreciation, Accumulated Depreciation	352,364
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,573,346
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	352,364
Operating Properties [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	51,784
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,097,969
Real Estate and Accumulated Depreciation, Carrying Amount of Land	616,467
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,533,286
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,149,753
Real Estate and Accumulated Depreciation, Accumulated Depreciation	430,422
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,149,753
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	430,422
Operating Properties [Member] | Maximum [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12140 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 74 West Broad Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10801 Nesbitt Avenue South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5705 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5715 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5735 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5775 West Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6161 Green Valley Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6601-6625 W. 78th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 750 Park of Commerce Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 777 Yamato Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 951 Broken Sound Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1301 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1305 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1309 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1313 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 500 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 501 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 505 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 510 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 676 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 700 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 301-321 S Goolsby Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3255 Neil Armstrong Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10400 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7615 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7625 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7695-7699 Anagram Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7800 Equitable Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7905 Fuller Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8855 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8911 Columbine Road (B2) [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8937 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8967 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8995 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9023 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 180 Sheree Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5400 Alliance Gateway Freeway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 101 Constitution Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 20 Liberty Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200 W Cypress Creek Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 100 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1317 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 21 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 22 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5 Manhattan Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 521 Butler Farm Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 100 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 100 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 100-107 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 101 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 101-111 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 102 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 103-109 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 104 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 110 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 111-159 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 113-123 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 120 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 123-135 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 132 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 161-175 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 181-187 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200-264 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 201 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 210-223 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 220 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 231-237 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 240 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 261-283 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300 Welsh Road - Building 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300 Welsh Road - Building 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300-309 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4 Walnut Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 400-445 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 455 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 506 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 507 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 555 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 680 Blair Mill Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 700 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 747 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 767 Electronic Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 151 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 170 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 180 South Warner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 190 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 155 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2 West Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 20 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 257-275 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 27-43 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 277-293 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 30 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 333 Phoenixville Pike [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 375 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 40 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 40 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 420 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 425 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 45-67 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 50 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 508 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 510 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 55 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 65 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 75 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 77-123 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3824-3960 Crowfarn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12501 & 12701 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12800 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 12900 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5400-5500 Feltl Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6000 Clearwater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3100 SW 145th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3350 SW 148th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3400 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3450 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 220 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 222 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8201 Chancellor Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13 Centennial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4207 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4217 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4303 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4313 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4405 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4410 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4415 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4425 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4435 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4450 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4610 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4750 S. 44th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9801 South 51st Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Cotton Center Building 18 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2020 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1301 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13621 NW 12th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13630 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 13650 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 111 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 131 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 150-182 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200-34 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4502 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4503 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4505 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4508 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4511 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4520 Seedling Circle [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4630 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4631 Woodland Corporate Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 501 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 701-725 South US Hwy 301 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7724 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7725 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7802-50 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7851-7861 Woodland Center Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7852-98 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7920 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8001 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8112-42 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8154-8198 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8212 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8401-8408 Benjamin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8705 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8715 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8725 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8735 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8745 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8900-34 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8921 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9001-9015 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9002-9036 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 901-933 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 910-926 Chad Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9306-24 East Broadway Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1457 Miller Store Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 200 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 208 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2809 South Lynnhaven Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 484 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 629 Phoenix Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1200 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1500 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 825 Duportail Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | Liberty Square Retail Blocks [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 10 Cornell Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 265 Ballardvale Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Maximum [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Operating Properties [Member] | Minimum [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12140 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 74 West Broad Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10801 Nesbitt Avenue South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5705 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5715 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5735 Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5775 West Old Shakopee Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6161 Green Valley Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6601-6625 W. 78th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 750 Park of Commerce Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 777 Yamato Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 951 Broken Sound Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1301 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1305 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1309 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1313 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 500 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 501 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 505 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 510 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 676 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 700 Independence Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 301-321 S Goolsby Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3255 Neil Armstrong Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10400 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7615 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7625 Smetana Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7695-7699 Anagram Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7800 Equitable Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7905 Fuller Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8855 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8911 Columbine Road (B2) [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8937 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8967 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8995 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9023 Columbine Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 180 Sheree Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5400 Alliance Gateway Freeway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 101 Constitution Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 20 Liberty Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200 W Cypress Creek Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 100 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1317 Executive Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 21 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 22 Enterprise Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5 Manhattan Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 521 Butler Farm Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 100 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 100 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 100-107 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 101 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 101-111 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 102 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 103-109 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 104 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 110 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 111-159 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 113-123 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 120 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 123-135 Rock Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 132 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 161-175 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 181-187 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200-264 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 201 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 210-223 Witmer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 220 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 231-237 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 240 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 261-283 Gibraltar Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300 Welsh Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300 Welsh Road - Building 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300 Welsh Road - Building 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300-309 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4 Walnut Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 400-445 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 455 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 506 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 507 Prudential Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 555 Business Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 680 Blair Mill Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7 Walnut Grove Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 700 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 747 Dresher Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 767 Electronic Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 151 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 170 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 180 South Warner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 190 South Warner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 155 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2 West Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 20 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 257-275 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 27-43 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 277-293 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 30 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 333 Phoenixville Pike [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 375 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 40 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 40 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 420 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 425 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 45-67 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5 Country View Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 50 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 508 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 510 Lapp Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 55 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 65 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 75 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 77-123 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3824-3960 Crowfarn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12501 & 12701 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12800 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 12900 Whitewater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5400-5500 Feltl Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6000 Clearwater Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3100 SW 145th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3350 SW 148th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3400 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3450 Lakeside Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 220 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 222 Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8201 Chancellor Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13 Centennial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4207 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4217 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4303 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4313 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4405 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4410 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4415 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4425 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4435 E. Cotton Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4450 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4610 South 44th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4750 S. 44th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9801 South 51st Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Cotton Center Building 18 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2020 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1301 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13621 NW 12th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13630 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 13650 NW 8th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 111 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 131 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 150-182 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200-34 Kelsey Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4502 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4503 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4505 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4508 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4511 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4520 Seedling Circle [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4630 Woodland Corporate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4631 Woodland Corporate Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 501 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 701-725 South US Hwy 301 [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7724 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7725 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7802-50 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7851-7861 Woodland Center Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7852-98 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7920 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8001 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8112-42 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8154-8198 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8212 Woodland Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8401-8408 Benjamin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8705 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8715 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8725 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8735 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8745 Henderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8900-34 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8921 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9001-9015 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9002-9036 Brittany Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 901-933 US Highway 301 South [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 910-926 Chad Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9306-24 East Broadway Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1457 Miller Store Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 200 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 208 Golden Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2809 South Lynnhaven Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 484 Viking Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 629 Phoenix Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1200 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1500 Liberty Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 825 Duportail Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | Liberty Square Retail Blocks [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 10 Cornell Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 265 Ballardvale Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Operating Properties [Member] | Minimum [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	5 years
Development in Progress [Member] | 330 South Royal Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Coppell, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,091,426
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,958,079
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,049,505
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,049,505
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,049,505
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11020 Holly Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Dayton, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,536,731
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,271,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,808,507
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,808,507
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,808,507
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 333 Howard Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Des Plaines, IL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	7,928,724
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,619,989
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,548,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,548,713
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,548,713
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 120 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,243,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,263,759
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,506,859
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,506,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,506,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 130 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,171,160
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	628,480
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,799,640
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,799,640
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,799,640
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 140 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,243,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,249,949
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,493,049
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,493,049
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,493,049
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11835 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hagerstown, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	14,121,622
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,631,418
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	28,753,040
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,753,040
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	28,753,040
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 7460 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,785,446
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,118,710
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,904,156
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,904,156
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,904,156
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 7462 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,059,337
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,115,061
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,174,398
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,174,398
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,174,398
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 1050 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	973,482
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,588,294
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,561,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,561,776
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,561,776
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 10720 West Sam Houston Parkway North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,871,875
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	21,894,894
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	25,766,769
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	25,766,769
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	25,766,769
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11220 Ella Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,505,855
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,268,433
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,774,288
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,774,288
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,774,288
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 8303 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,613,370
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	13,220,947
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,834,317
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,834,317
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,834,317
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11150 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Medley, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,627,899
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	412,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,040,500
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,040,500
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,040,500
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11250 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Medley, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,798,886
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,641,003
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,439,889
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,439,889
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	10,439,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 11500 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Miami, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,623,293
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,917,535
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,540,828
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,540,828
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,540,828
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 10020 South Reinhart Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Oak Creek, WI
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,516,764
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	6,341,820
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,858,584
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,858,584
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,858,584
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 1200 Intrepid Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	16,169
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,752,441
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,768,610
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,768,610
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,768,610
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 201 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	243,905
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	22,485,941
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,729,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,729,846
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	22,729,846
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,255,507
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,402,214
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,657,721
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,657,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	9,657,721
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 4701 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Philadelphia, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	419,107
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,143,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,562,349
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,562,349
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,562,349
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 5800 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Richmond, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	604,146
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,974,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,578,425
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,578,425
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,578,425
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 1720 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,629,020
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	577,191
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,206,211
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,206,211
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,206,211
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 1850 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,975,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	19,642,158
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,617,758
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,617,758
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	23,617,758
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | 1910 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tempe, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,693,504
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	12,742,133
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,435,637
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	17,435,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	17,435,637
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Development in Progress [Member] | Total Development in Progress [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	77,549,028
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	199,862,347
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	277,411,375
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	277,411,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	277,411,375
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 4551 New York Avenue Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Arlington, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,754,659
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	24,126
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,778,784
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,778,784
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,778,784
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Mill Creek Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Bethlehem, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	18,548,585
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,815,956
Real Estate and Accumulated Depreciation, Carrying Amount of Land	20,364,541
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,364,541
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,364,541
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Boca Colannade Yamato Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Boca Raton, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,039,735
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	554,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,594,558
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,594,558
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,594,558
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 12912 Virkler Drive Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	208,646
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,086
Real Estate and Accumulated Depreciation, Carrying Amount of Land	218,732
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	218,732
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	218,732
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Charlotte Distribution Center Land-Lot 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	654,713
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	654,713
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	654,713
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	654,713
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Shopton Ridge Business Park Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Charlotte, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,058,588
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,058,588
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,058,588
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,058,588
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Holly Lane North Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Dayton, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	889,205
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	889,205
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	889,205
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	889,205
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 1951 TW Alexander Drive Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Durham, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,027,176
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	142,782
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,169,958
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,169,958
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,169,958
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Flying Cloud Drive Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Eden Pairie, MN
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,051,631
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	26,366
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,077,997
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,077,997
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,077,997
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Camelback 303 Business Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Goodyear, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	16,857,556
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,219,563
Real Estate and Accumulated Depreciation, Carrying Amount of Land	20,077,119
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,077,119
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	20,077,119
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Pleasant Ridge Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greensboro, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	564,535
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,841,863
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,406,398
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,406,398
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,406,398
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Caliber Ridge Ind. Park Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Greer, SC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	16,338
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	43,596
Real Estate and Accumulated Depreciation, Carrying Amount of Land	59,934
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	59,934
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	59,934
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Lakefront Plaza II Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hampton, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	138,101
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	102,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land	240,865
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	240,865
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	240,865
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Ridge Road & Hanover Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,875,203
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	211,720
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,086,923
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,086,923
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	4,086,923
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Ridge Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Hanover, MD
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,371,183
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	443,379
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,814,562
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,814,562
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,814,562
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Piedmond Centre Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	High Point, NC
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	913,276
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	896,066
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,809,342
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,809,342
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,809,342
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Commonwealth Corporate Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Horsham, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,043,938
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	24,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,068,597
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,068,597
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,068,597
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Interwood Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,160,668
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,362
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,175,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,175,030
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,175,030
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Rankin Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,756,865
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,417,911
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,174,776
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,174,776
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	7,174,776
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Richey Road Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	26,135,466
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	707,105
Real Estate and Accumulated Depreciation, Carrying Amount of Land	26,842,571
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,842,571
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	26,842,571
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Taub Beltway 8 Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Houston, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,611,474
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	628,497
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,239,971
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,239,971
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,239,971
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Frye Road and Valley View Lane Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Irving, TX
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,901,634
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	24,398
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,926,032
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,926,032
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,926,032
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Kent County, UK [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Kent, UK
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,079,465
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,079,465
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,079,465
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Commodore Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Logan, NJ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	792,118
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,126,107
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,918,225
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,918,225
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,918,225
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Spring Creek Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Lower Macungie Twp, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	25,615,668
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,189,074
Real Estate and Accumulated Depreciation, Carrying Amount of Land	42,804,742
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	42,804,742
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	42,804,742
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 380 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,344,809
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,344,809
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,344,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	1,344,809
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Quarry Ridge Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Malvern, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	675,499
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	141,517
Real Estate and Accumulated Depreciation, Carrying Amount of Land	817,016
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	817,016
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	817,016
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Miami International Tradeport Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Medley, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	16,739,632
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,947,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land	19,686,774
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	19,686,774
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	19,686,774
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Monarch Towne Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Mirarar, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,085,337
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	405,663
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,491,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,491,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,491,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 557 Nazareth Pike Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Nazareth, PA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	4,667,646
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	343,645
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,011,291
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	5,011,291
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,011,291
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | South 27th Street Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Oak Creek, WI
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	427,838
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	427,838
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	427,838
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	427,838
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Beachline Industrial Park Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Orlando, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	267,468
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	95,810
Real Estate and Accumulated Depreciation, Carrying Amount of Land	363,278
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	363,278
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	363,278
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Southern Boulevard Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Palm Beach County, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	12,042,368
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	200,186
Real Estate and Accumulated Depreciation, Carrying Amount of Land	12,242,554
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,242,554
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	12,242,554
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Buckeye Logistics Center West Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	11,203,594
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	65,658
Real Estate and Accumulated Depreciation, Carrying Amount of Land	11,269,252
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,269,252
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	11,269,252
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Cotton Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Phoenix, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	8,237,744
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	702
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,238,446
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,238,446
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,238,446
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Woodlands Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Sandston, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	148,314
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	21,283
Real Estate and Accumulated Depreciation, Carrying Amount of Land	169,597
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	169,597
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	1996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	169,597
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Northsight Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Scottsdale, AZ
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	6,176,464
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,160,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,337,053
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,337,053
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,337,053
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Suffolk Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Suffolk, VA
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,715,714
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	793,572
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,509,286
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,509,286
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	3,509,286
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | 6119 W. Linebaugh Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	180,136
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	29,890
Real Estate and Accumulated Depreciation, Carrying Amount of Land	210,026
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	210,026
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	210,026
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Legacy Park Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,289,423
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,908,708
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,198,131
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,198,131
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	8,198,131
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Renaissance Park Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Location of Property	Tampa, FL
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,995,375
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	214,724
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,210,099
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,210,099
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired or Developed	2007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	2,210,099
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	0
Land Held for Development [Member] | Total Land Held for Development [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	214,184,322
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	43,794,292
Real Estate and Accumulated Depreciation, Carrying Amount of Land	269,058,078
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	269,058,078
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	269,058,078
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$0
[1]	Denotes property is collateralized under mortgages with Allianz, John Hancock, LaSalle Bank, Athene, New York Life and Wells Fargo totaling $424.2 million.