Liberty Property Trust (LPT) 10-K 1 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2016	Feb. 24, 2017	Jun. 30, 2016
Document Information [Line Items]
Entity Registrant Name	LIBERTY PROPERTY TRUST
Entity Central Index Key	921,112
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		146,992,276
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 5.7
Liberty Property Limited Partnership [Member]
Document Information [Line Items]
Entity Registrant Name	LIBERTY PROPERTY LIMITED PARTNERSHIP
Entity Central Index Key	921,113

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Real estate:
Land and land improvements	$ 1,094,470	$ 1,184,927
Building and improvements	4,501,921	5,131,648
Less accumulated depreciation	(940,115)	(1,148,928)
Operating real estate	4,656,276	5,167,647
Development in progress	267,450	360,948
Land held for development	336,569	336,967
Net real estate	5,260,295	5,865,562
Cash and cash equivalents	43,642	35,353
Restricted cash	12,383	9,018
Accounts receivable, net	13,994	14,343
Deferred rent receivable, net	109,245	118,787
Deferred financing and leasing costs, net	153,393	192,109
Investments in and advances to unconsolidated joint ventures	245,078	218,454
Assets held for sale	4,548	4,954
Prepaid expenses and other assets	150,235	99,049
Total assets	5,992,813	6,557,629
LIABILITIES
Mortgage loans, net	276,650	307,908
Unsecured notes, net	2,280,286	2,580,108
Credit facility	0	259,000
Accounts payable	65,914	51,382
Accrued interest	21,878	26,154
Dividend and distributions payable	71,501	71,787
Other liabilities	206,124	223,499
Total liabilities	2,922,353	3,519,838
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of December 31, 2016 and December 31, 2015	7,537	7,537
EQUITY
Common shares of beneficial interest, $.001 par value, 283,987,000 shares authorized; 146,993,018 and 147,577,984 shares issued and outstanding as of December 31, 2016 and December 31, 2015, respectively	147	148
Additional paid-in capital	3,655,910	3,669,627
Accumulated other comprehensive loss	(56,031)	(22,506)
Distributions in excess of net income	(596,635)	(674,688)
Total Liberty Property Trust shareholders’ equity	3,003,391	2,972,581
Noncontrolling interest – operating partnership
3,530,031 and 3,539,075 common units outstanding as of December 31, 2016 and December 31, 2015, respectively	54,631	53,754
Noncontrolling interest – consolidated joint ventures	4,901	3,919
Total equity	3,062,923	3,030,254
Total liabilities, noncontrolling interest - operating partnership and equity	5,992,813	6,557,629
Liberty Property Limited Partnership [Member]
Real estate:
Land and land improvements	1,094,470	1,184,927
Building and improvements	4,501,921	5,131,648
Less accumulated depreciation	(940,115)	(1,148,928)
Operating real estate	4,656,276	5,167,647
Development in progress	267,450	360,948
Land held for development	336,569	336,967
Net real estate	5,260,295	5,865,562
Cash and cash equivalents	43,642	35,353
Restricted cash	12,383	9,018
Accounts receivable, net	13,994	14,343
Deferred rent receivable, net	109,245	118,787
Deferred financing and leasing costs, net	153,393	192,109
Investments in and advances to unconsolidated joint ventures	245,078	218,454
Assets held for sale	4,548	4,954
Prepaid expenses and other assets	150,235	99,049
Total assets	5,992,813	6,557,629
LIABILITIES
Mortgage loans, net	276,650	307,908
Unsecured notes, net	2,280,286	2,580,108
Credit facility	0	259,000
Accounts payable	65,914	51,382
Accrued interest	21,878	26,154
Dividend and distributions payable	71,501	71,787
Other liabilities	206,124	223,499
Total liabilities	2,922,353	3,519,838
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of December 31, 2016 and December 31, 2015	7,537	7,537
EQUITY
General partner’s equity - 146,993,018 and 147,577,984 common units outstanding as of December 31, 2016 and December 31, 2015, respectively	3,003,391	2,972,581
Limited partners’ equity – 3,530,031 and 3,539,075 common units outstanding as of December 31, 2016 and December 31, 2015, respectively	54,631	53,754
Noncontrolling interest – operating partnership
Noncontrolling interest – consolidated joint ventures	4,901	3,919
Total equity	3,062,923	3,030,254
Total liabilities, noncontrolling interest - operating partnership and equity	$ 5,992,813	$ 6,557,629

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Par value (USD per share)	$ 0.001	$ 0.001
Common shares authorized	283,987,000	283,987,000
Common shares issued	146,993,018	147,577,984
Common shares outstanding	146,993,018	147,577,984
Redeemable Preferred Stock [Member]
Redeemable stock, preferred units outstanding	301,483	301,483
Liberty Property Limited Partnership [Member]
Common shares outstanding	146,993,018	147,577,984
Common units outstanding	3,530,031	3,539,075
Liberty Property Limited Partnership [Member] | Redeemable Preferred Stock [Member]
Redeemable stock, preferred units outstanding	301,483	301,483

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING REVENUE
Rental	$ 543,410	$ 584,165	$ 568,346
Operating expense reimbursement	190,357	224,608	224,285
Development service fee income	12,941	0	0
Total operating revenue	746,708	808,773	792,631
OPERATING EXPENSE
Rental property	102,481	132,702	138,124
Real estate taxes	99,793	105,410	101,814
General and administrative	68,198	68,710	63,327
Depreciation and amortization	205,090	226,575	231,943
Development service fee expense	12,165	0	0
Impairment - real estate assets	3,879	18,244	117
Total operating expense	491,606	551,641	535,325
Operating income	255,102	257,132	257,306
OTHER INCOME (EXPENSE)
Interest and other income	13,950	23,781	17,600
Loss on debt extinguishment	(27,099)	0	0
Interest expense	(115,077)	(135,779)	(151,887)
Total other income (expense)	(128,226)	(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures	126,876	145,134	123,019
Gain on property dispositions	219,270	100,314	45,147
Income taxes	(1,971)	(2,673)	(2,590)
Equity in earnings of unconsolidated joint ventures	21,970	3,149	10,314
Income from continuing operations	366,145	245,924	175,890
Discontinued operations (including net gain on property dispositions of $46,631 for the year ended December 31, 2014)	0	0	48,581
Net income	366,145	245,924	224,471
Noncontrolling interest – operating partnership	(9,070)	(6,192)	(5,713)
Noncontrolling interest – consolidated joint ventures	(258)	(249)	(547)
Income available to common shareholders	356,817	239,483	218,211
Comprehensive income attributable to common shareholders
Net income	366,145	245,924	224,471
Other comprehensive (loss) income - foreign currency translation	(34,744)	(12,540)	(15,671)
Other comprehensive income (loss) - derivative instruments	410	(488)	(1,961)
Other comprehensive loss	(34,334)	(13,028)	(17,632)
Total comprehensive income	331,811	232,896	206,839
Less: comprehensive income attributable to noncontrolling interest	(8,519)	(6,135)	(5,878)
Comprehensive income attributable to common shareholders	$ 323,292	$ 226,761	$ 200,961
Weighted average number of common shares outstanding
Basic (shares)	146,204	148,243	147,216
Diluted (shares)	146,889	148,843	147,886
Amounts attributable to common shareholders
Income from continuing operations	$ 356,817	$ 239,483	$ 170,772
Discontinued operations	0	0	47,439
Net income available to common shareholders	$ 356,817	$ 239,483	$ 218,211
Common shares [Member]
Basic:
Income from continuing operations (USD per share/unit)	$ 2.44	$ 1.62	$ 1.16
Income from discontinued operations (USD per share/unit)	0	0	0.32
Income per common share - basic (USD per share/unit)	2.44	1.62	1.48
Diluted:
Income from continuing operations (USD per share/unit)	2.43	1.61	1.16
Income from discontinued operations (USD per share/unit)	0	0	0.32
Income per common share - diluted (USD per share/unit)	$ 2.43	$ 1.61	$ 1.48
Liberty Property Limited Partnership [Member]
OPERATING REVENUE
Rental	$ 543,410	$ 584,165	$ 568,346
Operating expense reimbursement	190,357	224,608	224,285
Development service fee income	12,941	0	0
Total operating revenue	746,708	808,773	792,631
OPERATING EXPENSE
Rental property	102,481	132,702	138,124
Real estate taxes	99,793	105,410	101,814
General and administrative	68,198	68,710	63,327
Depreciation and amortization	205,090	226,575	231,943
Development service fee expense	12,165	0	0
Impairment - real estate assets	3,879	18,244	117
Total operating expense	491,606	551,641	535,325
Operating income	255,102	257,132	257,306
OTHER INCOME (EXPENSE)
Interest and other income	13,950	23,781	17,600
Loss on debt extinguishment	(27,099)	0	0
Interest expense	(115,077)	(135,779)	(151,887)
Total other income (expense)	(128,226)	(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures	126,876	145,134	123,019
Gain on property dispositions	219,270	100,314	45,147
Income taxes	(1,971)	(2,673)	(2,590)
Equity in earnings of unconsolidated joint ventures	21,970	3,149	10,314
Income from continuing operations	366,145	245,924	175,890
Discontinued operations (including net gain on property dispositions of $46,631 for the year ended December 31, 2014)	0	0	48,581
Net income	366,145	245,924	224,471
Noncontrolling interest – consolidated joint ventures	(258)	(249)	(547)
Preferred unit distributions	(472)	(472)	(472)
Income available to common shareholders	365,415	245,203	223,452
Comprehensive income attributable to common shareholders
Net income	366,145	245,924	224,471
Other comprehensive (loss) income - foreign currency translation	(34,744)	(12,540)	(15,671)
Other comprehensive income (loss) - derivative instruments	410	(488)	(1,961)
Other comprehensive loss	(34,334)	(13,028)	(17,632)
Total comprehensive income	$ 331,811	$ 232,896	$ 206,839
Weighted average number of common shares outstanding
Basic (shares)	149,740	151,783	150,770
Diluted (shares)	150,425	152,383	151,440
Net Income Allocated to General Partners	$ 356,817	$ 239,483	$ 218,211
Net Income Allocated to Limited Partners	9,070	6,192	5,713
Amounts attributable to common shareholders
Income from continuing operations	365,887	245,675	175,343
Net income available to common shareholders	$ 365,415	$ 245,203	$ 223,452
Liberty Property Limited Partnership [Member] | Common units [Member]
Basic:
Income from continuing operations (USD per share/unit)	$ 2.44	$ 1.62	$ 1.16
Income from discontinued operations (USD per share/unit)	0	0	0.32
Income per common share - basic (USD per share/unit)	2.44	1.62	1.48
Diluted:
Income from continuing operations (USD per share/unit)	2.43	1.61	1.16
Income from discontinued operations (USD per share/unit)	0	0	0.32
Income per common share - diluted (USD per share/unit)	$ 2.43	$ 1.61	$ 1.48

Consolidated Statements of Com5

Consolidated Statements of Comprehensive Income (Parentheticals) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Discontinued operations, net gain on property dispositions	$ 46,631
Liberty Property Limited Partnership [Member]
Discontinued operations, net gain on property dispositions	$ 46,631

Consolidated Statement of Equit

Consolidated Statement of Equity - USD ($) $ in Thousands		Total		Liberty Property Limited Partnership [Member]		Liberty Property Limited Partnership [Member]Noncontrolling Interest-Consolidated Joint Ventures [Member]		Liberty Property Limited Partnership [Member]General Partner [Member]		Liberty Property Limited Partnership [Member]Limited Partner [Member]		Common shares [Member]	Common units [Member]Liberty Property Limited Partnership [Member]General Partner [Member]	Common units [Member]Liberty Property Limited Partnership [Member]Limited Partner [Member]	Common Shares Of Beneficial Interest [Member]		Additional Paid-In Capital [Member]		Accumulated Other Comprehensive Income (Loss) [Member]		Distributions in Excess of Net Income [Member]		Total Liberty Property Trust Shareholders' Equity [Member]		Noncontrolling Interest- Operating Partnership - Common		Noncontrolling Interest-Consolidated Joint Ventures [Member]
Beginning Balance at Dec. 31, 2013		$ 3,117,062	[1]	$ 3,117,062	[2]	$ 3,622	[2]	$ 3,056,059	[2]	$ 57,381	[2]				$ 147	[1]	$ 3,617,668	[1]	$ 7,437	[1]	$ (569,193)	[1]	$ 3,056,059	[1]	$ 57,381	[1]	$ 3,622	[1]
Common shares outstanding - Beginning Balance (shares) at Dec. 31, 2013	[1]											146,596,892
General Partner's units outstanding - Beginning Balance (shares) at Dec. 31, 2013	[2]												146,596,892
Limited Partners' units outstanding - Beginning Balance (shares) at Dec. 31, 2013	[2]													3,556,566
Increase (Decrease) in Stockholders' Equity
Net proceeds from the issuance of common shares		58,473													2		58,471						58,473
Net proceeds from the issuance of common shares (shares)												1,957,378
Net income		223,999		223,999		547		218,211		5,241											218,211		218,211		5,241		547
Distributions		(288,047)																			(281,066)		(281,066)		(6,731)		(250)
Share-based compensation		12,457															12,457						12,457
Contributions from partners				70,930				70,930
Contributions from partners (shares)													1,957,378
Distributions to partners				(288,047)		(250)		(281,066)		(6,731)
Other comprehensive (loss) income - foreign currency translation		(15,671)		(15,671)				(15,306)		(365)									(15,306)				(15,306)		(365)
Other comprehensive (loss) income - derivative instruments		(1,961)		(1,961)				(1,915)		(46)									(1,915)				(1,915)		(46)
Redemption of noncontrolling interests – common units																	48						48		(48)
Redemption of noncontrolling interests – common units (shares)												3,000	3,000
Redemption of limited partners common units for common shares								48		(48)
Redemption of limited partners common units for common shares (shares)														(3,000)
Common shares outstanding - Ending Balance (shares) at Dec. 31, 2014												148,557,270
Limited Partners' units outstanding - Ending Balance (shares) at Dec. 31, 2014														3,553,566
General Partner's units outstanding - Ending Balance (shares) at Dec. 31, 2014													148,557,270
Ending Balance at Dec. 31, 2014		3,106,312		3,106,312		3,919		3,046,961		55,432					149		3,688,644		(9,784)		(632,048)		3,046,961		55,432		3,919
Noncontrolling interest - operating partnership (mezzanine) - Beginning of Period at Dec. 31, 2013		7,537	[1]	7,537	[2]
Increase (Decrease) in Limited Partners' Equity
Temporary Equity, Net Income		472		472
Temporary Equity, Distributions		(472)		(472)
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2014		7,537		7,537
Increase (Decrease) in Stockholders' Equity
Net proceeds from the issuance of common shares		38,797															38,797						38,797
Net proceeds from the issuance of common shares (shares)												1,328,017
Net income		245,452		245,452		249		239,483		5,720											239,483		239,483		5,720		249
Distributions		(289,240)																			(282,123)		(282,123)		(6,868)		(249)
Share-based compensation		13,763															13,763						13,763
Contributions from partners				52,560				52,560
Contributions from partners (shares)													1,328,017
Distributions to partners				(289,240)		(249)		(282,123)		(6,868)
Other comprehensive (loss) income - foreign currency translation		(12,540)		(12,540)				(12,245)		(295)									(12,245)				(12,245)		(295)
Other comprehensive (loss) income - derivative instruments		(488)		(488)				(477)		(11)									(477)				(477)		(11)
Redemption of noncontrolling interests – common units																	224						224		(224)
Redemption of noncontrolling interests – common units (shares)												14,491	14,491
Redemption of limited partners common units for common shares								224		(224)
Redemption of limited partners common units for common shares (shares)														(14,491)
Share repurchase		$ (71,802)		$ (71,802)				(71,802)							(1)		(71,801)						(71,802)
Share repurchase (shares)												(2,321,794)	(2,321,794)
Common shares outstanding - Ending Balance (shares) at Dec. 31, 2015		147,577,984		147,577,984								147,577,984
Limited Partners' units outstanding - Ending Balance (shares) at Dec. 31, 2015				3,539,075										3,539,075
General Partner's units outstanding - Ending Balance (shares) at Dec. 31, 2015													147,577,984
Ending Balance at Dec. 31, 2015		$ 3,030,254		$ 3,030,254		3,919		2,972,581		53,754					148		3,669,627		(22,506)		(674,688)		2,972,581		53,754		3,919
Increase (Decrease) in Limited Partners' Equity
Temporary Equity, Net Income		472		472
Temporary Equity, Distributions		(472)		(472)
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2015		7,537		7,537
Increase (Decrease) in Stockholders' Equity
Net proceeds from the issuance of common shares		13,029															13,029						13,029
Net proceeds from the issuance of common shares (shares)												802,834
Net income		365,673		365,673		258		356,817		8,598											356,817		356,817		8,598		258
Distributions		(285,802)																			(278,764)		(278,764)		(6,780)		(258)
Share-based compensation		15,699															15,699						15,699
Contributions from partners				28,728				28,728
Contributions from partners (shares)													802,834
Distributions to partners				(285,802)		(258)		(278,764)		(6,780)
Other comprehensive (loss) income - foreign currency translation		(34,744)		(34,744)				(33,925)		(819)									(33,925)				(33,925)		(819)
Other comprehensive (loss) income - derivative instruments		410		410				400		10									400				400		10
Redemption of noncontrolling interests – common units																	132						132		(132)
Redemption of noncontrolling interests – common units (shares)												9,044	9,044
Redemption of limited partners common units for common shares								132		(132)
Redemption of limited partners common units for common shares (shares)														(9,044)
Share repurchase		(40,896)		(40,896)				(40,896)							(1)		(40,895)						(40,896)
Share repurchase (shares)												(1,396,844)	(1,396,844)
Acquisition of noncontrolling interests		$ (700)		$ (700)		982		(1,682)									(1,682)						(1,682)				982
Common shares outstanding - Ending Balance (shares) at Dec. 31, 2016		146,993,018		146,993,018								146,993,018
Limited Partners' units outstanding - Ending Balance (shares) at Dec. 31, 2016				3,530,031										3,530,031
General Partner's units outstanding - Ending Balance (shares) at Dec. 31, 2016													146,993,018
Ending Balance at Dec. 31, 2016		$ 3,062,923		$ 3,062,923		$ 4,901		$ 3,003,391		$ 54,631					$ 147		$ 3,655,910		$ (56,031)		$ (596,635)		$ 3,003,391		$ 54,631		$ 4,901
Increase (Decrease) in Limited Partners' Equity
Temporary Equity, Net Income		472		472
Temporary Equity, Distributions		(472)		(472)
Noncontrolling interest - operating partnership (mezzanine) - End of Period at Dec. 31, 2016		$ 7,537		$ 7,537
[1]	The Company adjusted the January 1, 2014 balances of Accumulated Other Comprehensive (Loss) Income, Distributions in Excess of Net Income, and Noncontrolling Interest - Operating Partnership - Common from previous filings. See Note 2.
[2]	The Company adjusted the January 1, 2014 balances of General Partner's Equity and Limited Partners' Equity - Common Units from previous filings. See Note 2.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 366,145	$ 245,924	$ 224,471
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	207,673	229,779	236,075
Amortization of deferred financing costs	3,974	4,395	4,811
Impairment - real estate assets	3,879	18,244	117
Loss on debt extinguishment	27,099	0	0
Equity in earnings of unconsolidated joint ventures	(21,970)	(3,149)	(10,314)
Distributions from unconsolidated joint ventures	0	2,444	0
Gain on property dispositions	(219,270)	(100,314)	(91,778)
Share-based compensation	14,478	12,919	12,457
Other	(6,128)	(9,937)	(7,935)
Changes in operating assets and liabilities:
Restricted cash	4,352	10,478	30,286
Accounts receivable	421	1,009	(1,770)
Deferred rent receivable	(16,927)	(23,167)	(15,263)
Prepaid expenses and other assets	(16,766)	(14,540)	(28,360)
Accounts payable	8,943	1,822	5,299
Accrued interest	(4,276)	1,641	(1,264)
Other liabilities	(18,606)	7,818	(20,348)
Net cash provided by operating activities	333,021	385,366	336,484
INVESTING ACTIVITIES
Investment in properties – acquisitions	(9,216)	(111,811)	(124,962)
Investment in properties – other	(54,249)	(77,626)	(102,466)
Investments in and advances to unconsolidated joint ventures	(70,581)	(43,676)	(22,243)
Distributions from unconsolidated joint ventures	63,048	33,195	15,330
Net proceeds from disposition of properties/land	1,192,918	530,440	559,322
Investment in development in progress	(342,489)	(210,677)	(288,375)
Investment in land held for development	(110,082)	(150,523)	(105,324)
Payment of deferred leasing costs	(32,682)	(48,672)	(40,123)
Other	(23,265)	(10,310)	2,504
Net cash provided by (used in) investing activities	613,402	(89,660)	(106,337)
FINANCING ACTIVITIES
Net proceeds from issuance of common shares	13,029	38,797	58,473
Share repurchase	(40,896)	(71,802)	0
Proceeds from unsecured notes	396,648	398,576	0
Repayments of unsecured notes including prepayment premium	(723,368)	(316,000)	(200,000)
Repayments of mortgage loans	(29,538)	(175,364)	(56,156)
Proceeds from credit facility	591,300	1,122,700	517,550
Repayments on credit facility	(850,300)	(1,030,700)	(350,550)
Payment of deferred financing costs	(3,550)	(3,656)	(3,629)
Distribution paid on common shares	(279,248)	(282,582)	(280,136)
Distribution paid on units/noncontrolling interests	(8,212)	(7,596)	(7,453)
Net cash used in financing activities	(934,135)	(327,627)	(321,901)
Net (decrease) increase in cash and cash equivalents	12,288	(31,921)	(91,754)
Decrease in cash and cash equivalents related to foreign currency translation	(3,999)	(2,072)	(2,314)
Cash and cash equivalents at beginning of year	35,353	69,346	163,414
Cash and cash equivalents at end of year	43,642	35,353	69,346
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	366,145	245,924	224,471
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	207,673	229,779	236,075
Amortization of deferred financing costs	3,974	4,395	4,811
Impairment - real estate assets	3,879	18,244	117
Loss on debt extinguishment	27,099	0	0
Equity in earnings of unconsolidated joint ventures	(21,970)	(3,149)	(10,314)
Distributions from unconsolidated joint ventures	0	2,444	0
Gain on property dispositions	(219,270)	(100,314)	(91,778)
Share-based compensation	14,478	12,919	12,457
Other	(6,128)	(9,937)	(7,935)
Changes in operating assets and liabilities:
Restricted cash	4,352	10,478	30,286
Accounts receivable	421	1,009	(1,770)
Deferred rent receivable	(16,927)	(23,167)	(15,263)
Prepaid expenses and other assets	(16,766)	(14,540)	(28,360)
Accounts payable	8,943	1,822	5,299
Accrued interest	(4,276)	1,641	(1,264)
Other liabilities	(18,606)	7,818	(20,348)
Net cash provided by operating activities	333,021	385,366	336,484
INVESTING ACTIVITIES
Investment in properties – acquisitions	(9,216)	(111,811)	(124,962)
Investment in properties – other	(54,249)	(77,626)	(102,466)
Investments in and advances to unconsolidated joint ventures	(70,581)	(43,676)	(22,243)
Distributions from unconsolidated joint ventures	63,048	33,195	15,330
Net proceeds from disposition of properties/land	1,192,918	530,440	559,322
Investment in development in progress	(342,489)	(210,677)	(288,375)
Investment in land held for development	(110,082)	(150,523)	(105,324)
Payment of deferred leasing costs	(32,682)	(48,672)	(40,123)
Other	(23,265)	(10,310)	2,504
Net cash provided by (used in) investing activities	613,402	(89,660)	(106,337)
FINANCING ACTIVITIES
Proceeds from unsecured notes	396,648	398,576	0
Repayments of unsecured notes including prepayment premium	(723,368)	(316,000)	(200,000)
Repayments of mortgage loans	(29,538)	(175,364)	(56,156)
Proceeds from credit facility	591,300	1,122,700	517,550
Repayments on credit facility	(850,300)	(1,030,700)	(350,550)
Payment of deferred financing costs	(3,550)	(3,656)	(3,629)
Capital contributions	13,029	38,797	58,473
Distributions to partners/noncontrolling interest holders	(328,356)	(361,980)	(287,589)
Net cash used in financing activities	(934,135)	(327,627)	(321,901)
Net (decrease) increase in cash and cash equivalents	12,288	(31,921)	(91,754)
Decrease in cash and cash equivalents related to foreign currency translation	(3,999)	(2,072)	(2,314)
Cash and cash equivalents at beginning of year	35,353	69,346	163,414
Cash and cash equivalents at end of year	$ 43,642	$ 35,353	$ 69,346

Organization

Organization	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [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, 2016 . 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. As of January 1, 2016 under the revised accounting standard Topic 810 (see Recently Issued Accounting Standards below), the Operating Partnership is a variable interest entity ("VIE") of the Trust as the limited partners do not have substantive kick-out or participating rights. The Trust is the primary beneficiary of the Operating Partnership as it has the power to direct the activities of the Operating Partnership and the rights to absorb 97.7% of the net income of the Operating Partnership. The Trust has no significant assets or liabilities other than its investment in the Operating Partnership. As the Operating Partnership is already consolidated in the balance sheets of the Trust, the identification of this entity as a VIE has no impact on the consolidated financial statements of the Trust. In addition, the Company holds a 20% interest in Liberty/Comcast 1701 JFK Boulevard, LP which was determined to be a VIE. The Company determined that it is not the primary beneficiary as the Company and its third party partner share control of the joint venture. The Company's maximum exposure to loss is equal to its equity investment in the joint venture which was $18.7 million and $20.5 million as of December 31, 2016 and 2015, respectively. All square footage amounts are unaudited.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	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. The Company consolidates joint ventures that are considered to be variable interest entities (“VIEs”) where we are the primary beneficiary. The Company (i) evaluates the sufficiency of the total equity investment at risk, (ii) reviews the voting rights and decision-making authority of the equity investment holders as a group and whether there are any guaranteed returns, protection against losses, or capping of residual returns within the group and (iii) establishes whether activities within the venture are on behalf of an investor with disproportionately few voting rights in making this VIE determination. To the extent that the Company (i) is the sole entity that has the power to direct the activities of the VIE and (ii) has the obligation or rights to absorb the VIE's losses or receive its benefits, then the Company would be the primary beneficiary and would consolidate the VIE. All significant intercompany transactions and accounts have been eliminated. 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 development and 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. The total of capitalized compensation costs directly related to the development of property for the years ended December 31, 2016 , 2015 and 2014 was $7.2 million , $5.5 million and $5.1 million , respectively. Construction related payables at December 31, 2016 and 2015 were $37.1 million and $42.9 million , respectively. The Company allocates the purchase price of real estate acquired to land, building and improvements and intangibles at 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 vacant properties are capitalized and included in net real estate at cost. Beginning on October 1, 2016, with the Company's adoption of ASU 2017-01 (see below), acquisition-related costs for properties with in-place leases are also capitalized and included in net real estate at cost. 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 amortizes 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. No impairment losses on the Company's investments in unconsolidated joint ventures were recognized during the years ended December 31, 2014, 2015 or 2016. 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, 2016 and 2015 was $7.3 million and $6.9 million , respectively. The Company recognized bad debt expense of $0.6 million , $2.0 million and $1.7 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. Revenue Recognition 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. In the fourth quarter of 2016, the Company entered into an agreement relating to the fee development of an office building at its Camden Waterfront project in Camden, NJ. Project revenues and related costs and expenses are presented on a gross basis as "Development service fee income" and "Development service fee expense" in the Consolidated Statements of Comprehensive Income. Additionally, at the same time, the Company began classifying development fees and expenses relating to its fee development arrangements for certain unconsolidated joint venture projects in a manner consistent with the Camden project described above. Previously, development service fee income relating to its unconsolidated joint ventures had been classified as other income and development service fee expense had been classified as general and administrative expense in amounts as follows: Nine months ended Year ended December 31, September 30, 2016 (unaudited) 2015 2014 Other income $ 3,789 $ 6,159 $ 2,456 General and administrative expense $ 3,210 $ 3,730 $ 1,608 Revenue and expense associated with service fee development is accounted for under the percentage of completion method. Revenues are recognized on the percentage of completion method based on applicable costs incurred with respect to each development agreement. The Company uses the relative sales value method to allocate costs and recognize profits from service fee development. Under the relative sales value method, estimates of aggregate project revenues and aggregate project costs are used to determine the allocation of project cost of sales and the resulting profit in each accounting period. In subsequent periods, cost of sale allocations and the resulting profits are adjusted to reflect changes in the actual and estimated costs and revenues of each project. Provisions for estimated losses on uncompleted contracts are recognized immediately in the period in which such losses are determined. Deferred Financing and Leasing Costs Costs incurred in connection with the financing of the credit facility or leasing are capitalized and amortized on a straight line basis over the term of the related loan or lease. Costs incurred in connection with the financing of mortgage loans or unsecured notes are reported as a deduction from the face amount of that liability and amortized on a straight line basis over the term of the related loan. 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. The total of this capitalized compensation was $3.8 million , $4.6 million and $3.9 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. Fair Value of Financial Instruments ASC 820, Fair Value Measurements and Disclosures, gives guidance on the fair value measurement of a financial asset or liability. Inputs used to develop fair value are classified in one of three categories: Level 1 inputs (quoted prices (unadjusted) in active markets for identical assets or liabilities), Level 2 inputs (inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly) and Level 3 inputs (unobservable inputs for the asset or liability). 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, 2016 and December 31, 2015 . 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 20 - Derivative Instruments. The Company used a discounted cash flow model to determine the estimated fair value of its debt as of December 31, 2016 and December 31, 2015 . 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 at December 31, 2015 and December 31, 2016 (in thousands): Mortgage Loans Unsecured Notes Carrying Value Fair Value Carrying Value Fair Value As of December 31, 2015 $ 307,908 $ 306,334 $ 2,580,108 $ 2,616,395 As of December 31, 2016 $ 276,650 $ 286,684 $ 2,280,286 $ 2,340,762 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 still 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 and state income taxes separate from the Company. 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 itself is also subject to tax in certain states and the United Kingdom. Accordingly, the Company recognizes 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, 2016 , 2015 and 2014 and no interest and penalties accrued at December 31, 2016 or December 31, 2015 which related to any uncertain tax positions or significant unrecognized tax benefits. Certain of the Company's taxable REIT subsidiaries had net operating loss carryforwards available of approximately $30.8 million as of December 31, 2016 . 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 (in prior years) Luxembourg. With few exceptions, the Company and its subsidiaries are no longer subject to examination by taxing authorities in these jurisdictions for years prior to 2010. The Federal tax cost basis of the wholly owned real estate was $6.5 billion and $7.6 billion at December 31, 2016 and 2015 , 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 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 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 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, 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 August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) ("ASU 2014-15"), which gives guidance regarding management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and provide related footnote disclosures. If conditions or events raise substantial doubt about an entity’s ability to continue as a going concern, and substantial doubt is not alleviated after consideration of management’s plans, an entity should include a statement in the footnotes indicating that there is substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or available to be issued). The new standard is effective for fiscal years ending after December 15, 2016 and for annual and interim periods thereafter. The Company adopted ASU 2014-15 during the fourth quarter of 2016. No additional disclosures were necessary as a result of this adoption. 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 (except revenue in the scope of other accounting standards, including standards related to leasing). The standard clarifies the required factors that an entity must consider when recognizing revenue and requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. The standard also provides guidance regarding the measurement of gains and losses relative to the sale of certain nonfinancial assets, including real estate. ASU 2014-09 is effective for the Company beginning January 1, 2018. The Company has performed an initial assessment of ASU 2014-09 and plans to adopt the standard using the modified retrospective approach. Upon adoption of ASU 2016-02 (see below), the majority of our revenue will be subject to the allocation provisions outlined within the revenue standard. The Company is currently evaluating the specific implementation requirements for allocating the consideration within our contracts in accordance with ASU 2014-09 as well as other transactions subject to ASU 2014-09. The Company does not expect the new standard to have a material impact on the measurement and recognition of gains and losses on the sale of properties. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810) ("ASU 2015-02"). The standard requires that all entities re-evaluate and revise consolidation documentation for limited partnerships and similar legal entities. It makes changes to both the variable interest model and voting model. The Company adopted ASU 2015-02 on January 1, 2016. The adoption of ASU 2015-02 did not have a material impact on the Company's financial position and results of operations. In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For leases in which the Company is the lessor, the standard requires that the lease and non-lease components of the lease agreement should be separated. Revenue related to the lease component of the contract will be recognized on a straight-line basis, while revenue related to the non-lease component will be recognized under the provisions of ASU 2014-09 (see above). For lease agreements longer than one year in which the Company is the lessee, the Company will measure the present value of the future lease payments and recognize a right-of-use asset and corresponding lease liability on its balance sheet. In addition, the new standard states that only direct leasing costs may be capitalized. The Company is evaluating the impact ASU 2016-02 will have on its financial position and results of operations. In March 2016, the FASB issued ASU 2016-05, Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships ("ASU 2016-05"). ASU 2016-05 states that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under FASB Topic 815 does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. ASU 2016-05 is effective for the Company beginning January 1, 2017. Early adoption of ASU 2016-05 is permitted. The standard allows application on a prospective or modified retrospective basis. The Company does not believe that ASU 2016-05 will have a material impact on its financial position and results of operations. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 is designed to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for the Company beginning January 1, 2017. Early adoption of ASU 2016-09 is permitted. Certain amendments in the standard are to be applied retrospectively and certain amendments are to be applied prospectively. The Company does not believe that ASU 2016-09 will have a material impact on its financial position and results of operations. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 is designed to clarify how entities should classify cash receipts and cash payments in the statement of cash flows. ASU 2016-15 is effective for the Company beginning January 1, 2018. Early adoption of ASU 2016-15 is permitted. The standard requires retrospective application unless it is impracticable to do so. The Company is evaluating the impact ASU 2016-15 will have on its statement of cash flows. In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business (“ASU 2017-01”). ASU 2017-01 is designed to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses with application of the standard applied on a prospective basis upon adoption. Early adoption is permitted, including for interim or annual periods for which the financial statements have not been issued or made available for issuance. The Company has elected to early adopt ASU 2017-01 beginning on October 1, 2016. The adoption of ASU 2017-01 did not have a material impact on the Company's financial position or results of operations. Adjustment of previously reported financial information The Company became a party to a land development agreement in the United Kingdom also known as Kings Hill in 2003. The agreement between the Company and Kent County Council (“KCC”) provides for the Company’s participation in profits realized from the development and sale of primarily residential land and infrastructure. This development has proceeded in phases with Phase 1 of the project complete, and with Phase 2 of the project nearing completion as of the end of 2016. In August 2015, the Company also received planning permission to convert, develop and sell certain commercial land at Kings Hill as residential. This additional residential development is known as Phase 3. The Company has recognized its profit participation from the Kings Hill development as Other Income as KCC’s land has been sold and all related rights and obligations have lapsed over the course of the project. As Phase 2 was coming nearer to completion by the end of 2016, the Company determined that net profit from Kings Hill was not properly recognized in prior periods. The Company determined that the errors resulted largely from incorrect assumptions in its accounting model used to calculate the cost of sales to be recognized when land was sold and all related rights and obligations lapsed and in establishing its UK income tax provision beginning in 2003. In the

Income per Common Share of the

Income per Common Share of the Trust	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Income per Common Share of the Trust	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): 2016 2015 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income (Numerator) Weighted Average Shares (Denominator) Per Share Net income available to common shareholders - basic $ 356,817 146,204 $ 2.44 $ 239,483 148,243 $ 1.62 Dilutive shares for long-term compensation plans — 685 — 600 Net income available to common shareholders - diluted $ 356,817 146,889 $ 2.43 $ 239,483 148,843 $ 1.61 2014 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income from continuing operations net of noncontrolling interest - basic $ 170,772 147,216 $ 1.16 Dilutive shares for long-term compensation plans — 670 Income from continuing operations net of noncontrolling interest - diluted $ 170,772 147,886 $ 1.16 Discontinued operations net of noncontrolling interest - basic $ 47,439 147,216 $ 0.32 Dilutive shares for long-term compensation plans — 670 Discontinued operations net of noncontrolling interest - diluted $ 47,439 147,886 $ 0.32 Net income available to common shareholders - basic $ 218,211 147,216 $ 1.48 Dilutive shares for long-term compensation plans — 670 Net income available to common shareholders - diluted $ 218,211 147,886 $ 1.48 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 2016 , 2015 and 2014 were 755,000 , 1.5 million and 850,000 , respectively. During the years ended December 31, 2016 , 2015 and 2014 , 369,000 , 65,000 and 44,000 common shares, respectively, were issued upon the exercise of options. During the years ended December 31, 2016 , 2015 and 2014 , individuals acquired 9,044 , 14,491 and 3,000 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, 2016 , 2015 and 2014 , distributions per common share were $1.90 for each period.

Income per Common Unit of the O

Income per Common Unit of the Operating Partnership	12 Months Ended
	Dec. 31, 2016
Earnings Per Unit, Basic and Diluted [Line Items]
Income per Common Unit of the Operating Partnership	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): 2016 2015 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income (Numerator) Weighted Average Shares (Denominator) Per Share Net income available to common shareholders - basic $ 356,817 146,204 $ 2.44 $ 239,483 148,243 $ 1.62 Dilutive shares for long-term compensation plans — 685 — 600 Net income available to common shareholders - diluted $ 356,817 146,889 $ 2.43 $ 239,483 148,843 $ 1.61 2014 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income from continuing operations net of noncontrolling interest - basic $ 170,772 147,216 $ 1.16 Dilutive shares for long-term compensation plans — 670 Income from continuing operations net of noncontrolling interest - diluted $ 170,772 147,886 $ 1.16 Discontinued operations net of noncontrolling interest - basic $ 47,439 147,216 $ 0.32 Dilutive shares for long-term compensation plans — 670 Discontinued operations net of noncontrolling interest - diluted $ 47,439 147,886 $ 0.32 Net income available to common shareholders - basic $ 218,211 147,216 $ 1.48 Dilutive shares for long-term compensation plans — 670 Net income available to common shareholders - diluted $ 218,211 147,886 $ 1.48 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 2016 , 2015 and 2014 were 755,000 , 1.5 million and 850,000 , respectively. During the years ended December 31, 2016 , 2015 and 2014 , 369,000 , 65,000 and 44,000 common shares, respectively, were issued upon the exercise of options. During the years ended December 31, 2016 , 2015 and 2014 , individuals acquired 9,044 , 14,491 and 3,000 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, 2016 , 2015 and 2014 , distributions per common share were $1.90 for each period.
Liberty Property Limited Partnership [Member]
Earnings Per Unit, Basic and Diluted [Line Items]
Income per Common Unit of the Operating Partnership	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): 2016 2015 Income (Numerator) Weighted Average Units (Denominator) Per Unit Income (Numerator) Weighted Average Units (Denominator) Per Unit Income - net of noncontrolling interest - consolidated joint ventures $ 365,887 $ 245,675 Less: Preferred unit distributions (472 ) (472 ) Income available to common unitholders - basic $ 365,415 149,740 $ 2.44 $ 245,203 151,783 $ 1.62 Dilutive units for long-term compensation plans — 685 — 600 Income available to common unitholders - diluted $ 365,415 150,425 $ 2.43 $ 245,203 152,383 $ 1.61 2014 Income (Numerator) Weighted Average Units (Denominator) Per Unit Income from continuing operations net of noncontrolling interest - consolidated joint ventures $ 175,343 Less: Preferred unit distributions (472 ) Income from continuing operations available to common unitholders - basic $ 174,871 150,770 $ 1.16 Dilutive units for long-term compensation plans — 670 Income from continuing operations available to common unitholders - diluted $ 174,871 151,440 $ 1.16 Income from discontinued operations - basic $ 48,581 150,770 $ 0.32 Dilutive units for long-term compensation plans — 670 Income from discontinued operations - diluted $ 48,581 151,440 $ 0.32 Income available to common unitholders - basic $ 223,452 150,770 $ 1.48 Dilutive units for long-term compensation plans — 670 Income available to common unitholders - diluted $ 223,452 151,440 $ 1.48 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 2016 , 2015 and 2014 were 755,000 , 1.5 million and 850,000 , respectively. During the years ended December 31, 2016 , 2015 and 2014 , 369,000 , 65,000 and 44,000 common units, respectively, were issued upon the exercise of options. During the years ended December 31, 2016 , 2015 and 2014 , individuals acquired 9,044 , 14,491 and 3,000 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, 2016 , 2015 and 2014 , distributions per common unit were $1.90 for each period.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table sets forth the components of Accumulated Other Comprehensive Loss (in thousands): December 31, 2016 2015 Foreign Currency Translation: Beginning balance $ (22,023 ) $ (9,483 ) Translation adjustment (34,744 ) (12,540 ) Ending balance (56,767 ) (22,023 ) Derivative Instruments: Beginning balance (865 ) (377 ) Unrealized loss (659 ) (1,884 ) Reclassification adjustment (1) 1,069 1,396 Ending balance (455 ) (865 ) Total accumulated other comprehensive loss (57,222 ) (22,888 ) Less: portion included in noncontrolling interest – operating partnership 1,191 382 Total accumulated other comprehensive loss included in shareholders' equity $ (56,031 ) $ (22,506 ) (1) Amounts reclassified out of Accumulated Other Comprehensive Loss/General & Limited Partner's Equity into contractual interest expense.

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2016
Real Estate [Abstract]
Real Estate	REAL ESTATE The Company owns and operates industrial and office properties. The carrying value of these properties by type as of December 31, 2016 and 2015 is as follows (in thousands): Land Building and Land and Accumulated Improvements Improvements Total Depreciation 2016 Industrial properties $ 919,951 $ 3,757,063 $ 4,677,014 $ 734,595 Office properties 174,519 744,858 919,377 205,520 2016 Total $ 1,094,470 $ 4,501,921 $ 5,596,391 $ 940,115 2015 Industrial properties $ 824,140 $ 3,637,484 $ 4,461,624 $ 698,456 Office properties 360,787 1,494,164 1,854,951 450,472 2015 Total $ 1,184,927 $ 5,131,648 $ 6,316,575 $ 1,148,928 Depreciation expense was $166.8 million , $181.0 million and $179.1 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. Information on the operating properties the Company sold during the years ended December 31, 2016 and 2015 is as follows: 2016 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Chicago/Milwaukee 1 5 171,114 $ 10,625 Florida 51 12 3,509,641 505,828 Lehigh/Central PA 1 — 120,777 11,200 Minnesota 23 — 1,866,161 189,200 Philadelphia — 1 — 2,640 Southeastern PA 31 — 2,165,002 266,821 Other 18 18 1,631,295 224,241 Total 125 36 9,463,990 $ 1,210,555 2015 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Carolinas/Richmond 22 3 1,319,299 $ 110,054 Florida 4 — 874,125 55,425 Minnesota 2 — 222,642 25,700 Southeastern PA 46 20 2,724,489 316,583 Other 7 — 569,618 37,371 Total 81 23 5,710,173 $ 545,133 Included in the sales for the year ended December 31, 2015 are 22 properties and three acres of land in the Carolinas/Richmond segment that the Company sold for $110.3 million to a firm in which the brother of David L. Lingerfelt, a member of the Company's Board of Trustees, has an equity interest. During the year ended December 31, 2015, the Company completed a portfolio sale consisting of 41 properties and 20 acres of land in the Southeastern PA segment. As of December 31, 2016 and 2015 the Company had deferred gain recognition related to this sale in the amount of $14.3 million which is recorded in other liabilities on the accompanying consolidated balance sheets. Information on the operating properties and land parcels the Company acquired during the years ended December 31, 2016 and 2015 is as follows: 2016 Acquisitions Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Purchase Price (in thousands) Carolinas/Richmond — 13 — $ 2,251 Chicago/Milwaukee 1 6 73,160 11,064 Lehigh/Central PA — 76 — 15,395 Philadelphia — 6 — 13,943 Southeastern PA — 8 — 3,344 Other — 108 — 14,895 Total 1 217 73,160 $ 60,892 2015 Acquisitions Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Purchase Price (in thousands) Carolinas/Richmond — 94 — $ 1,727 Houston 3 139 921,196 86,497 Lehigh/Central PA — 281 — 62,402 Minnesota 1 188 197,956 24,541 Other 1 56 410,059 45,248 Total 5 758 1,529,211 $ 220,415

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Joint Ventures	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 generally included in interest and other income in the accompanying consolidated statements of comprehensive income. For the three months ended December 31, 2016, the Company began including development-related fees in development service income in the 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. On a periodic basis, management assesses whether there are any indicators that the value of the properties owned by the unconsolidated joint ventures may be impaired. As detailed below, management has determined that certain assets are impaired as the unconsolidated joint ventures dispose of and anticipate the potential disposition of certain properties prior to the end of their remaining useful lives. Liberty Venture I, LP As of December 31, 2016 , 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, 2016 , the joint venture owned 28 industrial properties totaling 4.5 million square feet. The joint venture also had one property under development, which is expected to comprise, upon completion, 302,000 square feet and is expected to represent a Total Investment of $20.5 million . During the year ended December 31, 2015, the joint venture realized gross proceeds of $8.5 million from the sale of one property totaling 198,000 square feet. The Company had a receivable from Liberty Venture I, LP for $250,000 and $451,000 as of December 31, 2016 and 2015, respectively. This related party receivable is reflected as prepaid expenses and other assets in the Company's consolidated balance sheets. 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 a gain of $2.5 million on this transaction. This gain is included in gain on property dispositions in the Company's consolidated statements of comprehensive income. The Company recognized $2.3 million , $1.6 million and $1.4 million in fees for services during the years ended December 31, 2016 , 2015 and 2014 , respectively. Kings Hill Unit Trust As of December 31, 2016 , 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, 2016 , 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 $4.1 million and $4.7 million as of December 31, 2016 and 2015 , respectively. The note receivable bears interest at a rate of 10% and is due in November 2020. 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 $121,000 and $271,000 as of December 31, 2016 and 2015, respectively. This related party receivable is reflected as prepaid expenses and other assets in the Company's consolidated balance sheets. The Company recognized $293,000 , $304,000 and $285,000 in fees for services during the years ended December 31, 2016 , 2015 and 2014 , respectively. Liberty Illinois, LP As of December 31, 2016 , 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, 2016 , the joint venture owned 12 industrial properties totaling 4.9 million square feet and 248 acres of developable land. During the year ended December 31, 2016, the joint venture sold four properties containing 636,000 square feet for $32.5 million . The Company's share of gain on property dispositions was $1.0 million and is included in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income. The Company had a receivable from Liberty Illinois, LP for $132,000 of December 31, 2016 . This related party receivable is reflected as prepaid expenses and other assets in the Company's consolidated balance sheets. The Company recognized $1.0 million , $1.3 million and $1.0 million in fees for services during the years ended December 31, 2016 , 2015 and 2014 , respectively. Liberty Washington, LP As of December 31, 2016 , the Company had a 25% interest in Liberty Washington, LP, an entity engaged in the ownership of office properties in Washington, D.C (and formerly Northern Virginia). This joint venture's properties are part of the Company's DC Metro reportable segment. During the year ended December 31, 2016, the Company divested itself of properties in this joint venture that were located in Northern Virginia (see below). These properties had been part of a reportable segment classified as Other. As of December 31, 2016 , the joint venture owned two office properties totaling 451,000 square feet. During the year ended December 31, 2016, the joint venture sold 12 properties located in Northern Virginia containing 1.2 million square feet and 6.0 acres of land for $187.2 million . During the year ended December 31, 2016, due to adverse conditions in the Northern Virginia office market, six properties containing 698,000 square feet were transferred to mortgage lenders in satisfaction of an aggregate of $112.5 million in nonrecourse mortgage loans that were secured by the properties. The book values of these properties had been written down to fair value in prior periods. Because these loans were nonrecourse, the Company believes that the transfers described above will not have an ongoing effect on its operating results or financial condition. The Company's share of gain from property dispositions and extinguishment of debt is included in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income. During the year ended December 31, 2016, the Company's share of gain from extinguishment of debt was $4.2 million . The Company's share of gain on property dispositions for the year ended December 31, 2016 was $6.0 million . During the year ended December 31, 2015, the joint venture realized gross proceeds of $5.0 million from the sale of one property totaling 80,000 square feet. The Company had a receivable from Liberty Washington, LP for $322,000 and $693,000 as of December 31, 2016 and 2015 , respectively. This related party receivable is reflected as prepaid expenses and other assets in the Company's consolidated balance sheets. During the year ended December 31, 2015, the Company concluded that certain of the properties owned by this joint venture were impaired and the joint venture recorded impairment charges of $56.8 million . The Company's share of this impairment charge was $11.5 million . The impairment charges were related to the Company's Northern Virginia reportable segment and the Company's share was included in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income. The Company determined these impairments based on third party offer prices. This is a Level 2 fair value calculation. During the year ended December 31, 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 of unconsolidated joint ventures 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 $2.0 million , $4.8 million and $4.4 million in fees for services during the years ended December 31, 2016 , 2015 and 2014 , respectively. Liberty/Comcast 1701 JFK Boulevard, LP As of December 31, 2016 , the Company had a 20% interest in Liberty/Comcast 1701 JFK Boulevard LP ("Liberty/Comcast"), formerly known as Liberty/Commerz 1701 JFK Boulevard, LP, an entity engaged in the ownership of a 1.25 million square foot office tower in Philadelphia, Pennsylvania. During the year ended December 31, 2015, the limited partnership agreement was amended to replace the general partner and admit a new general partner. As a result of this amendment the Company determined that this joint venture is a VIE. Because the Company and its third party partner share control of the joint venture as both parties have the power to direct its activities, the Company determined that it is not the primary beneficiary and that the equity method of accounting is appropriate. 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, 2016 and 2015 . 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 $401,000 and $407,000 as of December 31, 2016 and 2015 , respectively. This related party receivable is reflected in prepaid expenses and other assets in the Company's consolidated balance sheets. The Company recognized $2.7 million , $2.7 million and $2.4 million in fees for services during the years ended December 31, 2016 , 2015 and 2014 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 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 leasable office space (the "Office") and a 222 -room Four Seasons Hotel (the "Hotel") (collectively, "Liberty Property 18th and Arch"). 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 $932 million . The Company's investment in the project is expected to be approximately $186 million with 20% ownership interests in both joint ventures. As of December 31, 2016 , the Company's investment in these joint ventures was $133.0 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, 2016 , the total development in progress for the joint ventures was $671.0 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. The Company is accounting for the development of this project using the percentage of completion method. During the years ended December 31, 2016 , 2015 and 2014, the Company recognized $4.8 million , $5.1 million and $1.8 million , respectively, in developer and other fees related to the project. The Company had a receivable from this joint venture of $1.3 million as of December 31, 2016. This receivable is included in prepaid expenses and other assets in the Company's consolidated balance sheets. The Company had a payable to this joint venture of $1.2 million as of December 31, 2015. This payable is included in other liabilities in the Company's consolidated balance sheets. During the year ended December 31, 2016, the joint venture sold three residential condominium units located on the 45 th floor containing 14,700 square feet for $14.3 million . The Company's share of gain on property dispositions was $0.3 million and is included in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income. The Company will manage and lease the Office and Four Seasons Hotels Limited will manage the Hotel. Other Joint Ventures As of December 31, 2016 , the Company had a 50% ownership interest in three additional unconsolidated joint ventures. One of these joint ventures has six operating properties and an investment in land held for development and is part of the Company's Orlando reportable segment. One of these joint ventures sold its real estate assets in 2016 and was part of the Company's United Kingdom reportable segment. The sales price was $13.7 million and the Company's share of the loss on sale was $6,000 . This amount is included in in equity in earnings of unconsolidated joint ventures in the accompanying consolidated statements of comprehensive income. One 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 $2.3 million and $2.7 million as of December 31, 2016 and 2015 , 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. Additionally, as of December 31, 2016 , the Company had a 20% ownership interest in an unconsolidated joint venture that owns one acre of developable land and is part of the Company's Philadelphia reportable segment. 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, 2016 and 2015 and condensed statements of operations for the years ended December 31, 2016 , 2015 and 2014 for Liberty Venture I LP, Kings Hill Unit Trust, Liberty Illinois, LP, Liberty Washington LP, Liberty/Comcast, Liberty Property 18th & Arch, and the other unconsolidated joint ventures are as follows (in thousands): Condensed Balance Sheets: December 31, 2016 Liberty Kings Hill Liberty Liberty Liberty/ Liberty Property Venture I, LP Unit Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other Total Real estate assets $ 226,313 $ 137,960 $ 251,765 $ 289,627 $ 495,842 $ — $ 71,722 $ 1,473,229 Accumulated depreciation (42,779 ) (26,872 ) (51,901 ) (44,235 ) (125,014 ) — (9,702 ) (300,503 ) Real estate assets, net 183,534 111,088 199,864 245,392 370,828 — 62,020 1,172,726 Development in progress 6,886 — — — — 671,032 — 677,918 Land held for development — — 31,567 — — — 42,259 73,826 Other assets 23,494 9,603 19,036 18,749 48,074 52,053 29,654 200,663 Total assets $ 213,914 $ 120,691 $ 250,467 $ 264,141 $ 418,902 $ 723,085 $ 133,933 $ 2,125,133 Debt $ 154,386 $ 83,846 $ 137,294 $ 103,667 $ 309,475 $ — $ 57,660 $ 846,328 Other liabilities 6,673 24,513 8,433 4,385 9,964 95,574 17,155 166,697 Equity 52,855 12,332 104,740 156,089 99,463 627,511 59,118 1,112,108 Total liabilities and equity $ 213,914 $ 120,691 $ 250,467 $ 264,141 $ 418,902 $ 723,085 $ 133,933 $ 2,125,133 Company's net investment in unconsolidated joint ventures (1) $ 11,175 $ 5,349 $ 15,339 $ 38,863 $ 18,688 $ 132,952 $ 22,712 $ 245,078 December 31, 2015 Liberty Kings Hill Liberty Liberty Liberty/ Liberty Property Venture I, LP Unit Trust Illinois, LP Washington, LP Comcast 18th and Arch (2) Other Total Real estate assets $ 168,690 $ 164,603 $ 263,552 $ 534,132 $ 495,248 $ — $ 67,940 $ 1,694,165 Accumulated depreciation (37,473 ) (28,513 ) (54,308 ) (43,224 ) (111,067 ) — (10,950 ) (285,535 ) Real estate assets, net 131,217 136,090 209,244 490,908 384,181 — 56,990 1,408,630 Development in progress 34,878 — 22,998 — — 323,615 17,401 398,892 Land held for development 4,471 — 28,590 2,000 — — 42,495 77,556 Other assets 14,860 8,967 20,668 52,429 47,441 15,594 49,312 209,271 Total assets $ 185,426 $ 145,057 $ 281,500 $ 545,337 $ 431,622 $ 339,209 $ 166,198 $ 2,094,349 Debt $ 121,793 $ 99,603 $ 155,601 $ 314,080 $ 313,402 $ — $ 56,739 $ 1,061,218 Other liabilities 10,571 27,408 8,594 10,634 9,618 40,958 29,064 136,847 Equity 53,062 18,046 117,305 220,623 108,602 298,251 80,395 896,284 Total liabilities and equity $ 185,426 $ 145,057 $ 281,500 $ 545,337 $ 431,622 $ 339,209 $ 166,198 $ 2,094,349 Company's net investment in unconsolidated joint ventures (1) $ 11,563 $ 6,789 $ 18,221 $ 55,552 $ 20,465 $ 62,677 $ 43,187 $ 218,454 Condensed Statements of Operations: Year Ended December 31, 2016 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust (4) Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) Total Total revenue $ 25,149 $ 11,926 $ 26,599 $ 39,727 $ 65,587 $ — $ 9,888 $ 178,876 Operating expense 6,835 4,854 9,961 15,935 26,761 280 2,801 67,427 18,314 7,072 16,638 23,792 38,826 (280 ) 7,087 111,449 Interest (4,182 ) (2,554 ) (7,243 ) (10,866 ) (19,737 ) — (2,462 ) (47,044 ) Depreciation and amortization (6,375 ) (3,557 ) (7,589 ) (10,750 ) (14,513 ) — (1,925 ) (44,709 ) Other income (expense) 50 (77 ) 64 257 (213 ) 1,270 7,123 8,474 Gain (loss) on sale/impairment — — 4,068 40,943 — — (11 ) 45,000 Net income (loss) $ 7,807 $ 884 $ 5,938 $ 43,376 $ 4,363 $ 990 $ 9,812 $ 73,170 Company's equity in earnings (loss) of unconsolidated joint ventures $ 2,332 $ 275 $ 2,065 $ 10,857 $ 1,594 $ 213 $ 4,634 $ 21,970 Year Ended December 31, 2015 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) Total Total revenue $ 23,708 $ 12,602 $ 26,085 $ 71,101 $ 68,444 $ — $ 9,387 $ 211,327 Operating expense 7,977 5,261 9,303 27,384 29,692 221 2,727 82,565 15,731 7,341 16,782 43,717 38,752 (221 ) 6,660 128,762 Interest (5,415 ) (6,116 ) (8,441 ) (17,353 ) (19,936 ) — (2,248 ) (59,509 ) Depreciation and amortization (6,399 ) (3,954 ) (7,406 ) (20,725 ) (14,442 ) — (1,840 ) (54,766 ) Other income (expense) 68 45,604 29 531 (227 ) 30 9,925 55,960 Gain (loss) on sale/impairment 760 — — (56,792 ) — — — (56,032 ) Net income (loss) $ 4,745 $ 42,875 $ 964 $ (50,622 ) $ 4,147 $ (191 ) $ 12,497 $ 14,415 Company's equity in earnings (loss) of unconsolidated joint ventures $ 1,540 $ (425 ) $ 807 $ (7,314 ) $ 2,053 $ (29 ) $ 6,517 $ 3,149 Year Ended December 31, 2014 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) 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 Loss from discontinued operations — — 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 (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 reducing the Company's investments in unconsolidated joint ventures by $1.4 million and $4.5 million as of December 31, 2016 and 2015 , respectively. 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) Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia. (3) Other income/(expense) for this group of joint ventures reflects gains related to the sales of land leasehold interests totaling $7.1 million , $9.9 million and $9.1 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Deferred Financing and Leasing

Deferred Financing and Leasing Costs	12 Months Ended
	Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Deferred Financing and Leasing Costs	DEFERRED FINANCING AND LEASING COSTS Deferred financing and leasing costs were comprised of the following as of December 31, 2016 and 2015 (in thousands): December 31, 2016 2015 Deferred financing costs $ 11,917 $ 11,917 Deferred leasing costs 190,849 229,798 Market value intangible 19,451 20,178 Origination value intangible 83,485 106,014 305,702 367,907 Accumulated amortization: Deferred financing costs 10,152 8,713 Deferred leasing costs 76,174 97,840 Market value intangible 12,626 10,358 Origination value intangible 53,357 58,887 152,309 175,798 Deferred financing and leasing costs, net $ 153,393 $ 192,109 Amortization of deferred financing costs was $4.0 million , $4.4 million and $4.8 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. Amortization of deferred leasing costs and origination value intangible was $37.1 million , $44.2 million and $51.3 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. As of December 31, 2016 , the remaining weighted-average amortization period was 3.7 years for market value intangible and 4.6 years for origination value intangible. The table above includes market value intangible assets. There were also $4.4 million and $6.1 million of unamortized market value intangible liabilities as of December 31, 2016 and 2015 , 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 market value intangible was an expense of $1.6 million , $1.9 million and $2.8 million for the years ended December 31, 2016 , 2015 , and 2014 , respectively. These amounts were included as a decrease in rental revenue in the accompanying consolidated statements of comprehensive income. The aggregate amortization of net market value intangible assets and liabilities is a decrease (increase) in rental revenue over the next five years and thereafter as follows (in thousands): 2017 $ 1,446 2018 1,425 2019 900 2020 5 2021 (142 ) Thereafter (1,181 ) Total $ 2,453 The aggregate amortization expense for origination value intangible asset for the next five years and thereafter is as follows (in thousands): 2017 $ 10,985 2018 7,310 2019 4,316 2020 2,164 2021 1,450 Thereafter 3,903 Total $ 30,128

Indebtedness

Indebtedness	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Indebtedness	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, 2016 , 2015 and 2014 were 4.3% , 4.6% and 5.0% , respectively. Interest costs during the years ended December 31, 2016 , 2015 and 2014 in the amount of $24.1 million , $16.7 million and $13.2 million , respectively, were capitalized. Cash paid for interest for the years ended December 31, 2016 , 2015 and 2014 was $142.7 million , $149.6 million and $164.9 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, 2016 , 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, 2016 are as follows (in thousands, except percentages): Weighted Mortgages Average Principal Principal Unsecured Credit Interest Amortization Maturities Notes Facility Total Rate 2017 $ 7,896 $ — $ — $ — $ 7,896 4.94 % 2018 6,470 27,102 — — 33,572 4.96 % 2019 6,666 50,043 — — 56,709 4.03 % 2020 3,351 67,370 350,000 — 420,721 4.93 % 2021 2,326 65,091 — — 67,417 4.06 % 2022 2,172 — 400,000 — 402,172 4.13 % 2023 2,281 — 300,000 — 302,281 3.39 % 2024 2,385 — 450,000 — 452,385 4.40 % 2025 2,513 — 400,000 — 402,513 3.76 % 2026 and thereafter 22,294 1,946 400,000 — 424,240 3.34 % Subtotal $ 58,354 $ 211,552 $ 2,300,000 $ — $ 2,569,906 4.04 % Reconciling items (1) 6,744 — (19,714 ) — (12,970 ) Total for consolidated balance sheet $ 65,098 $ 211,552 $ 2,280,286 $ — $ 2,556,936 (1) Includes deferred financing costs, premium/discount and market adjustments. Mortgage Loans and Unsecured Notes Mortgage loans with maturities ranging from 2017 to 2033 were collateralized by and in some instances cross-collateralized by properties with a net book value of $540.9 million as of December 31, 2016 . The interest rates on $2,569.9 million of mortgage loans (including $98.9 million fixed via a swap arrangement - see Footnote 20 - Derivative Instruments) and unsecured notes are fixed and range from 3.0% to 6.4% . The weighted average remaining term for the mortgage loans and unsecured notes is 6.7 years. Credit Facility The Company has maintained an unsecured credit facility throughout 2014 , 2015 and 2016 . 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, 2016, borrowings under the Credit Facility currently bear interest at LIBOR plus 105 basis points. There is also a 20 basis point annual facility fee on the current borrowing capacity. The Credit Facility provides for the interest rate and facility fee rate to be adjusted up or down based on changes in the credit ratings on the Company's senior unsecured debt. 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 no borrowings outstanding under the Credit Facility at December 31, 2016. As of December 31, 2016, letters of credit to third parties totaling $6.9 million had been issued for the account of the Company under this Credit Facility. The total borrowing capacity for the Credit Facility is $800 million and there is an accordion feature for an additional $400 million . 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 March 2015, the Company used proceeds from its Credit Facility together with available cash on hand to repay its $300 million 5.125% senior unsecured notes due March 2015. In March 2015, the Company issued $400 million of 3.75% senior unsecured notes due 2025. The net proceeds from this issuance were used to repay borrowings under the Company's Credit Facility and for general corporate purposes. In August 2015, the Company used proceeds from its Credit Facility to prepay in full without penalty a $105.8 million 7.0% mortgage loan due February 2016. In December 2015, the Company used proceeds from its Credit Facility to prepay in full without penalty a $59.7 million 7.5% mortgage loan due March 2016. In December 2015, the Company used proceeds from its Credit Facility to satisfy $16.0 million in unsecured notes bearing interest at 3.4% due December 2015. In September 2016, the Company issued $400 million of 3.25% senior unsecured notes due 2026. The Company used a substantial portion of the net proceeds from these notes to prepay its 5.5% Senior Notes due December 2016 in the amount of $300 million . This prepayment resulted in a $3.8 million loss on debt extinguishment. In November 2016, the Company used cash generated by the sale of properties (see Note 6) to prepay its 6.625% senior notes due October 2017 in the amount of $296.5 million and its 7.5% medium term notes due January 2018 in the amount of $100.0 million . This prepayment resulted in a $23.6 million loss on debt extinguishment.

Leasing Activity

Leasing Activity	12 Months Ended
	Dec. 31, 2016
Operating Leases, Future Minimum Payments Receivable [Abstract]
Leasing Activity	LEASING ACTIVITY Future minimum rental payments due from tenants under noncancelable operating leases as of December 31, 2016 are as follows (in thousands): 2017 $ 441,839 2018 403,254 2019 353,110 2020 287,720 2021 236,993 Thereafter 891,413 Total $ 2,614,329 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 - Opera

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units	12 Months Ended
	Dec. 31, 2016
Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract]
Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units	NONCONTROLLING INTEREST - OPERATING PARTNERSHIP / LIMITED PARTNERS' EQUITY - PREFERRED UNITS As of December 31, 2016 , the Company had outstanding the following cumulative preferred units of the Operating Partnership: ISSUE AMOUNT UNITS LIQUIDATION PREFERENCE DIVIDEND 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, 2016 , 2015 and 2014 .

Shareholders' Equity - Trust

Shareholders' Equity - Trust	12 Months Ended
	Dec. 31, 2016
Shareholders' Equity [Abstract]
Shareholders' Equity - Trust	SHAREHOLDERS' EQUITY - TRUST Common Shares The Company paid to holders of its common shares and holders of its common units distributions of $285.9 million , $289.3 million and $286.9 million during the years ended December 31, 2016 , 2015 and 2014 , 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, 2016 , 2015 and 2014 . The following unaudited table summarizes the taxability of common share distributions (taxability for 2016 is estimated): 2016 2015 2014 Ordinary dividend $ 1.0319 $ 1.4348 $ 1.2556 Qualified dividend 0.0013 — — Capital gain - 20% — 0.1112 — IRC Sec 1250 unrecaptured gain - 25% 0.6176 0.3372 0.3712 Return of capital 0.2492 0.0168 0.2732 Total $ 1.9000 $ 1.9000 $ 1.9000 The Company's tax return for the year ended December 31, 2016 has not been filed. The taxability information presented for the 2016 distributions is based upon the best available data at the time of this filing. In addition, certain of the Company's prior federal income tax returns may still be subject to examination by various taxing authorities. Because the application of tax laws and regulations is susceptible to varying interpretations, the taxability of distributions being reported here could be changed at a later date as a result of an examination and final determination by such taxing authorities. Common units The common units of the Operating Partnership not held by the Trust outstanding as of December 31, 2016 have the same economic characteristics as common shares of the Trust. The 3,530,031 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 3,530,031 outstanding common units based on the closing price of the common shares of the Company at December 31, 2016 was $ 139.4 million . No common units were issued in connection with acquisitions during 2016 , 2015 or 2014 . 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, 2016 , 2015 , and 2014 , 56,426 , 1,036,437 , and 1,643,536 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, of which $125 million remains available. The Company did no t sell any common shares pursuant to its continuous equity offering program during 2016, 2015 or 2014. Noncontrolling Interest - Consolidated Joint Ventures Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments. Share Repurchase In August 2015, the Company’s Board of Trustees authorized a share repurchase plan under which the Company may purchase up to $250 million of the Company’s outstanding common shares. Purchases made pursuant to the program will be made in either the open market or in privately negotiated transactions from time to time as permitted by securities laws and other legal requirements. During the years ended December 31, 2016 and 2015, the Company purchased an aggregate of 1.4 million and 2.3 million common shares, respectively, for $40.9 million and $71.8 million , respectively, as part of the share repurchase plan.

Owners' Equity - Operating Part

Owners' Equity - Operating Partnership	12 Months Ended
	Dec. 31, 2016
Liberty Property Limited Partnership [Member]
Class of Stock [Line Items]
Owners' Equity - Operating Partnership	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, 2016 have the same economic characteristics as common shares of the Trust. The 3,530,031 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 3,530,031 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 3,530,031 outstanding common units at December 31, 2016 based on the closing price of the common shares of the Company at December 31, 2016 was $ 139.4 million . No common units were issued in connection with acquisitions during 2016 , 2015 or 2014 . 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, 2016, 2015, and 2014, 56,426 , 1,036,437 , and 1,643,536 common shares, respectively, were issued through the Dividend Reinvestment and Share Purchase Plan. A corresponding number of common units were issued by the Operating Partnership. The Company used the proceeds to pay down outstanding borrowings under the Company's Credit Facility and for general corporate purposes. Noncontrolling Interest - Consolidated Joint Ventures Noncontrolling interest - consolidated joint ventures includes third-party ownership interests in consolidated joint venture investments. Share Repurchase In August 2015, the Company’s Board of Trustees authorized a share repurchase plan under which the Company may purchase up to $250 million of the Company’s outstanding common shares. Purchases made pursuant to the program will be made in either the open market or in privately negotiated transactions from time to time as permitted by securities laws and other legal requirements. During the years ended December 31, 2016 and 2015, the Company purchased an aggregate of 1.4 million and 2.3 million common shares, respectively, for $40.9 million and $71.8 million , respectively, as part of the share repurchase plan. In connection with these repurchases, an equal number of common units were repurchased by the Operating Partnership from the Trust.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
Employee Benefit Plans [Abstract]
Employee Benefit Plans	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 $874,000 , $1,038,000 and $943,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
Share-based Compensation [Abstract]
Share-Based Compensation	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. The plan was last amended and restated in 2014. Pursuant to the 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 of up to 21.1 million common shares of the Company. The Company capitalized $1.2 million , $0.9 million and $1.0 million in share-based compensation costs for the years ended December 31, 2016, 2015, and 2014, respectively. 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, 2016 , 2015 and 2014 was $165,000 , $1.5 million and $1.8 million , respectively. No new options were issued during the year ended December 31, 2016. 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, 2015 2014 Risk-free interest rate 1.8% 1.6% Dividend yield 5.2% 5.2% Historical volatility factor 0.24 0.236 Weighted-average expected life 7 years 6 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, 2016 follows: Options (000s) Weighted Average Exercise Price Outstanding January 1, 2016 2,609 $ 36.08 Exercised (451 ) 31.90 Forfeited (231 ) 44.42 Outstanding December 31, 2016 1,927 $ 36.02 Exercisable at December 31, 2016 1,436 $ 35.99 The weighted average fair value of options granted during the years ended December 31, 2015 and 2014 was $4.11 and $4.09 , respectively. Exercise prices for options outstanding as of December 31, 2016 ranged from $20.32 to $49.74 . At December 31, 2016 , the weighted average remaining contractual life of the options outstanding and exercisable was 5.3 years and 4.4 years, respectively. During the years ended December 31, 2016 , 2015 and 2014 , 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 $3.5 million , $364,000 and $310,000 , respectively. As of December 31, 2016 , 316,000 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, 2016 , 1.1 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 $6.4 million at that date. The total cash received from the exercise of options for the years ended December 31, 2016 , 2015 and 2014 was $14.4 million , $2.1 million and $1.4 million , respectively. As of December 31, 2016 , there was $85,000 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 0.5 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 either a 3 -year or 5 -year period beginning with the first anniversary of the grant and subject to certain accelerated vesting due to the age and years of service of certain employees. During 2016 , 2015 and 2014 , the Company granted restricted stock units to the executive officers pursuant to the 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 other executives, a portion of the restricted stock units will vest up to 200% at the end of a 3 -year period. 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 174% , 110% and 157% of the market value of a common share as of the grant date ("Market Value") for the chief executive officer and 136% , 90% and 125% of the Market Value for the other executives for the 2016, 2015 and 2014 grants, respectively. A separate grant was made to the Company's incoming Chief Financial Officer when he joined the Company, and the grant date fair value of this award's First Portion was determined to be 160% of the Market Value as of the grant date. 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. For the 2014 and 2015 grants, another 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 this 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. This component of the award was discontinued with the 2016 award. For the 2016 award, the second portion of the award for the executive officers, other than the incoming Chief Financial Officer, vests at the end of three years based on continued employment. The second portion of the Chief Financial Officer's award vests ratably over three years. The key assumptions used in the Monte Carlo simulations are as follows: Year Ended December 31, 2016 2015 2014 Risk-free interest rate 1.01% 0.99% 0.68% Volatility 19% 17% 24% 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, 2016 , 2015 and 2014 was $12.2 million , $10.0 million and $9.0 million , respectively. The Company's restricted LTI share activity for the year ended December 31, 2016 is as follows: Shares (000s) Weighted Avg. Grant Date Fair value Nonvested at January 1, 2016 723 $ 36.75 Granted 388 32.48 Vested (242 ) 37.07 Forfeited (57 ) 35.39 Nonvested at December 31, 2016 812 $ 34.71 The weighted average fair value of restricted shares granted during the years ended December 31, 2016 , 2015 and 2014 was $32.48 , $35.14 and $37.13 per share, respectively. As of December 31, 2016 , there was $8.6 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 1.2 years. The total fair value of restricted shares vested during the years ended December 31, 2016 , 2015 and 2014 was $9.0 million , $7.4 million and $9.3 million , respectively. Bonus Shares During the years ended December 31, 2016, 2015 and 2014, the Plan provided that employees of the Company could elect to receive bonuses or commissions in the form of common shares in lieu of cash ("Bonus Shares"). By making such election, the employee received 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, 2016 , 2015 and 2014 were 140,376 , 111,700 and 103,834 , respectively. Share-based compensation cost related to Bonus Shares for the years ended December 31, 2016 , 2015 and 2014 was $4.7 million , $3.9 million and $3.9 million , respectively. Profit Sharing 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, 2016 , 2015 and 2014 was $669,000 , $965,000 and $543,000 respectively. Remaining Reserved Common Shares under the Plan An additional 5,264,285 , 5,574,605 and 6,100,098 common shares were reserved for issuance for future grants under the Plan at December 31, 2016 , 2015 and 2014 , 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 11,022 , 13,127 and 12,612 shares issued, in accordance with the ESPP, during the years ended December 31, 2016 , 2015 and 2014 , respectively. Share-based compensation cost related to the ESPP for the years ended December 31, 2016 , 2015 and 2014 was $122,000 , $62,000 and $104,000 , respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
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, 2016 , were as follows (in thousands): Year Amount 2017 $ 1,339 2018 1,595 2019 1,595 2020 1,595 2021 1,595 2022 though 2067 34,379 Total $ 42,098 Operating ground lease expense incurred by the Company during the years December 31, 2016 , 2015 and 2014 totaled $1.0 million , $815,000 and $454,000 , 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, 2016 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, 2016 , the Company had letter of credit obligations of $6.9 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, 2016 , the Company had 25 buildings under development. These buildings are expected to contain a total of 5.6 million square feet of leaseable space and represent an anticipated aggregate investment of $537.1 million . At December 31, 2016 , Development in Progress totaled $267.5 million . In addition, as of December 31, 2016 , the Company had invested $7.5 million in deferred leasing costs related to these development buildings. As of December 31, 2016 , the Company was committed to $15.0 million in improvements on certain buildings and land parcels. As of December 31, 2016 , the Company was obligated to pay for tenant improvements not yet completed for a maximum of $31.3 million . As of December 31, 2016 , the Company was committed to $11.3 million in future land purchases. The Company expects to complete these purchases during the year ended December 31, 2017. As of December 31, 2016, the Company was committed to fund up to $4 million for tenant improvements and leasing commissions under a loan to the buyer of certain of the Company's properties. Unconsolidated joint ventures in which the Company holds an interest, and in another case an unrelated third party, have engaged the Company as the developer of its development properties pursuant to development agreements. The Company agrees, in consideration for a development fee, to be responsible for all aspects of the development of the properties and to guarantee the timely lien-free completion of construction of the properties and the payment, subject to certain exceptions, of any cost overruns incurred in the development of the properties. The Company is currently developing two buildings for its unconsolidated joint ventures which represent an anticipated aggregate investment by the joint ventures of $952.5 million . As of December 31, 2016, the Company was also committed to approximately $132.6 million in costs related to its agreement to develop, on a fee basis, an office building and infrastructure improvements for American Water Works in Camden, New Jersey. As of December 31, 2016, $17.2 million of these costs had been incurred. 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 Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) A summary of quarterly results of operations for the years ended December 31, 2016 and 2015 follows (in thousands, except for per share data): QUARTER ENDED DEC. 31, SEPT. 30, JUNE 30, MAR. 31, DEC. 31, SEPT. 30, JUNE 30, MAR. 31, 2016 (2) 2016 2016 2016 2015 (2) 2015 2015 2015 Operating revenue $ 179,057 $ 190,857 $ 186,654 $ 190,140 $ 199,382 $ 198,972 $ 203,518 $ 206,901 Net income 200,291 55,734 51,057 59,063 83,841 93,695 36,526 31,862 Income per common share - basic (1) 1.33 0.37 0.34 0.39 0.56 0.61 0.24 0.21 Income per common share - diluted (1) 1.33 0.37 0.34 0.39 0.55 0.61 0.24 0.21 (1) The sum of quarterly financial data may vary from the annual data due to rounding. (2) Amounts include adjustment of previously reported financial information as discussed in Note 2.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment Information	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. At December 31, 2016 , the Company's reportable segments were based on the Company's method of internal reporting and were as follows: • Carolinas/Richmond; • Chicago/Milwaukee; • Florida • Houston; • Lehigh/Central PA; • Minnesota; • Philadelphia; • Southeastern PA; and • United Kingdom. Certain other segments are aggregated into an "Other" category which includes the reportable segments: Arizona; Atlanta; Cincinnati/Columbus/Indianapolis; Dallas; DC Metro; New Jersey; Southern California; 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, 2016 2015 2014 Operating revenue Carolinas/Richmond $ 66,270 $ 71,950 $ 76,781 Chicago/Milwaukee 42,836 37,431 33,068 Florida 99,733 127,184 135,203 Houston 59,582 54,031 49,309 Lehigh/Central PA 141,046 133,473 118,145 Minnesota 41,192 47,932 54,892 Philadelphia 41,838 40,490 35,238 Southeastern PA 91,656 147,712 148,714 United Kingdom 13,376 15,135 16,360 Other 136,521 133,345 130,013 Segment-level operating revenue 734,050 808,683 797,723 Reconciliation to total operating revenues Development service fee income (1) 12,941 — — Discontinued operations — — (4,728 ) Other (283 ) 90 (364 ) Total operating revenue $ 746,708 $ 808,773 $ 792,631 Net operating income Carolinas/Richmond $ 46,170 $ 47,849 $ 48,935 Chicago/Milwaukee 28,199 24,851 20,856 Florida 62,177 77,283 83,195 Houston 32,499 31,159 29,134 Lehigh/Central PA 102,209 94,972 82,050 Minnesota 17,059 20,112 26,464 Philadelphia 30,862 29,679 26,722 Southeastern PA 53,947 80,458 81,183 United Kingdom 6,390 10,486 10,704 Other 89,274 87,925 83,991 Segment-level net operating income 468,786 504,774 493,234 Reconciliation to income from continuing operations Interest expense (2) (115,077 ) (135,779 ) (152,444 ) Loss on debt extinguishment (27,099 ) — — Depreciation/amortization expense (2) (3) (152,556 ) (166,500 ) (177,715 ) Impairment - real estate assets (3,879 ) (18,244 ) (117 ) Gain on property dispositions 219,270 100,314 45,147 Equity in earnings of unconsolidated joint ventures 21,970 3,149 10,314 General and administrative expense (2) (3) (45,357 ) (44,529 ) (38,041 ) Discontinued operations excluding gain on property dispositions — — (1,950 ) Income taxes (3) 47 (2,351 ) (2,404 ) Other 40 5,090 (134 ) Income from continuing operations $ 366,145 $ 245,924 $ 175,890 (1) Prior to the fourth quarter of 2016, development service fee income had been classified as other income and development service fee expense had been classified as general and administrative expense. See Note 2. (2) Includes activity on discontinued operations. (3) 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 (in thousands): Year ended December 31, 2016 2015 2014 Carolinas/Richmond $ 4,944 $ 5,307 $ 6,607 Chicago/Milwaukee 2,026 1,161 466 Florida 6,605 9,407 9,324 Houston 4,713 4,466 3,988 Lehigh/Central PA 12,262 11,641 10,157 Minnesota 3,832 4,986 4,478 Philadelphia 2,706 2,220 1,803 Southeastern PA 6,134 12,346 12,272 United Kingdom 259 292 177 Other 9,792 8,249 5,631 Depreciation and amortization of tenant improvement and lease transaction costs $ 53,273 $ 60,075 $ 54,903 The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2016 , 2015 and 2014 is as follows (in thousands): Year Ended December 31, 2016 December 31, 2015 December 31, 2014 Industrial Office Total Industrial Office Total Industrial Office Total Carolinas/Richmond $ 66,270 $ — $ 66,270 $ 62,075 $ 9,875 $ 71,950 $ 56,794 $ 19,987 $ 76,781 Chicago/Milwaukee 42,836 — 42,836 37,431 — 37,431 33,068 — 33,068 Florida 66,028 33,705 99,733 67,149 60,035 127,184 62,689 72,514 135,203 Houston 58,370 1,212 59,582 53,802 229 54,031 49,309 — 49,309 Lehigh/Central PA 138,766 2,280 141,046 131,168 2,305 133,473 115,821 2,324 118,145 Minnesota 22,171 19,021 41,192 24,721 23,211 47,932 25,378 29,514 54,892 Philadelphia 12,842 28,996 41,838 11,809 28,681 40,490 10,072 25,166 35,238 Southeastern PA 19,448 72,208 91,656 28,457 119,255 147,712 28,895 119,819 148,714 United Kingdom 10,775 2,601 13,376 12,104 3,031 15,135 13,090 3,270 16,360 Other (1) 91,762 44,759 136,521 86,180 47,165 133,345 82,672 47,341 130,013 $ 529,268 $ 204,782 734,050 $ 514,896 $ 293,787 808,683 $ 477,788 $ 319,935 797,723 Reconciliation to total operating revenue Development service fee income 12,941 — — Discontinued operations — — (4,728 ) Corporate other (283 ) 90 (364 ) Total operating revenue $ 746,708 $ 808,773 $ 792,631 The Company's total assets by reportable segment as of December 31, 2016 and 2015 is as follows (in thousands): As of December 31, 2016 2015 Carolinas/Richmond $ 503,920 $ 467,098 Chicago/Milwaukee 423,889 429,390 Florida 514,431 874,352 Houston 530,438 522,285 Lehigh/Central PA 1,311,815 1,157,468 Minnesota 192,409 346,840 Philadelphia 557,510 444,889 Southeastern PA 262,155 448,523 United Kingdom 189,766 215,850 Other 1,403,431 1,586,481 Segment-level total assets 5,889,764 6,493,176 Corporate Other 103,049 64,453 Total assets $ 5,992,813 $ 6,557,629 The Company's real estate assets by reportable segment as of December 31, 2016 and 2015 is as follows (in thousands): As of December 31, 2016 2015 Carolinas/Richmond $ 482,736 $ 446,348 Chicago/Milwaukee 382,325 387,182 Florida 476,046 815,712 Houston 495,817 483,432 Lehigh/Central PA 1,234,090 1,096,195 Minnesota 182,737 322,627 Philadelphia 332,933 282,159 Southeastern PA 236,317 410,195 United Kingdom 149,082 174,390 Other 1,288,212 1,447,322 Total real estate assets $ 5,260,295 $ 5,865,562 The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Costs incurred on long-lived assets Carolinas/Richmond $ 51,647 $ 31,175 $ 82,600 Chicago/Milwaukee 18,294 13,483 21,698 Florida 38,312 43,594 45,152 Houston 25,638 96,681 70,903 Lehigh/Central PA 176,386 165,319 105,725 Minnesota 11,023 41,259 28,966 Philadelphia 57,691 34,122 32,012 Southeastern PA 13,110 9,047 39,638 United Kingdom 11,492 12,960 16,298 Other 107,500 125,412 172,495 Total costs incurred on long-lived assets $ 511,093 $ 573,052 $ 615,487

Accounting for the Impairment o

Accounting for the Impairment or Disposal of Long-Lived Assets	12 Months Ended
	Dec. 31, 2016
Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]
Accounting for the Impairment or Disposal of Long-Lived Assets	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 DC Metro 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 Accounting Standards Update 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") 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. 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. 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 Revenues $ 4,728 Operating expenses (2,258 ) Interest and other income 37 Interest expense (557 ) Depreciation and amortization — Income before gain on property dispositions 1,950 Gain on property dispositions 46,631 Net income $ 48,581 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. In October 2016, the Company completed the sale of a portfolio of 108 properties totaling approximately 7.6 million square feet and 26.7 acres of land for $969 million for a net gain of $179.1 million . As this sale did not represent a strategic shift for the Company, it is not classified as discontinued operations A summary of net income (excluding gain on sale) related to this portfolio is as follows (in thousands): Year Ended December 31, 2016 2015 2014 Net income $ 48,609 $ 58,792 $ 51,898 Noncontrolling interest - operating partnership (1,142 ) (1,370 ) (1,220 ) Income available to common shareholders $ 47,467 $ 57,422 $ 50,678 Assets Held for Sale Two parcels of land in the Company's Florida reportable segment totaling 12.5 acres were considered held for sale as of December 31, 2016. Asset Impairment The Company disposes of and anticipates the potential disposition of certain properties prior to the end of their remaining useful lives. During the years ended December 31, 2016 , 2015 and 2014 , the Company recognized impairment losses of $3.9 million , $18.2 million and $0.1 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 (in thousands): Year Ended December 31, Reportable Segment 2016 2015 2014 Carolinas/Richmond $ — $ 13,755 $ — Minnesota 3,879 — — Southeastern PA — 2,328 106 Other — 2,161 11 Total $ 3,879 $ 18,244 $ 117 The Company determined these impairments based on third party offer prices and quoted offer prices for comparable transactions which are Level 2 and Level 3 inputs, respectively, according to the fair value hierarchy established in ASC 820. These measurements have occurred throughout the respective periods as circumstances arise, and the resulting estimates of fair value are not necessarily reflective of measurements at the period’s end. The Company has evaluated each of its properties and land held for development and has determined that there were no additional valuation adjustments necessary at December 31, 2016 . The Company applied reasonable estimates and judgments in determining the level of impairments recognized. Should external or internal circumstances change requiring the need to shorten the holding periods or adjust the estimated future cash flows of the Company’s assets, the Company could be required to record impairment charges in the future.

Dervative Instruments

Dervative Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS The Company borrows funds at a combination of fixed and variable rates. Borrowings under the Company's revolving credit facility and certain bank mortgage loans bear interest at variable rates. Our long-term debt typically bears interest at fixed rates. The Company's interest rate risk management objectives are to limit generally the impact of interest rate changes on earnings and cash flows and to lower the Company's overall borrowing costs. To achieve these objectives, from time to time, the Company enters 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. The Company generally does not hold or issue these derivative contracts for trading or speculative purposes. The interest rate on all of the Company's 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 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. 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. The Company holds an 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 aggregate notional amounts of $98.9 million and $101.4 million at December 31, 2016 and 2015 , respectively, and expire at various dates between 2018 and 2020 . The Company accounts for the effective portion of changes in the fair value of a derivative in accumulated other comprehensive loss and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the ineffective portion of changes in the fair value of a derivative directly in earnings. The following table presents the location in the financial statements of the gains or losses recognized related to the Company’s cash flow hedges for the year ended December 31, 2016 , 2015, and 2014 (in thousands): Year Ended December 31, 2016 December 31, 2015 December 31, 2014 Amount of loss related to the effective portion recognized in other comprehensive (loss) income $ (648 ) $ (1,884 ) $ (3,400 ) Amount of loss related to the effective portion reclassified to interest expense $ (1,069 ) $ (1,396 ) $ (1,500 ) Amount of loss related to the ineffective portion recognized in interest expense $ (48 ) $ (91 ) $ (82 ) The fair value of the interest rate swaps in the amount of $4.9 million and $7.1 million as of December 31, 2016 and 2015 , respectively, is included in other liabilities in the accompanying consolidated balance sheets. The Company estimates that $0.6 million will be reclassified from accumulated other comprehensive loss 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 defaults 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 $4.9 million .

Supplemental Disclosure to Stat

Supplemental Disclosure to Statements of Cash Flows	12 Months Ended
	Dec. 31, 2016
Supplemental Disclosure to Statements of Cash Flows [Abstract]
Supplemental Disclosure to Statements of Cash Flows	SUPPLEMENTAL DISCLOSURE TO CONSOLIDATED STATEMENT OF CASH FLOWS The following are supplemental disclosures to the statements of cash flows for the years ended December 31, 2016 , 2015 and 2014 (amounts in thousands): 2016 2015 2014 Write-off of fully depreciated/amortized property and deferred costs $ 41,406 $ 42,339 $ 38,131 Write-off of depreciated property and deferred costs due to sale/demolition 461,480 252,017 173,083 Write-off of costs related to early debt extinguishment 219 — — Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity — — (11,948 ) Changes in accrued development capital expenditures (11,368 ) 11,964 6,264 Unrealized gain (loss) on cash flow hedge 410 (488 ) (3,419 ) Capitalized equity-based compensation 1,221 876 1,045 Redemption of noncontrolling interests - common units 132 — — 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, 2016
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure	Liberty Property Trust and Liberty Property Limited Partnership Schedule II (in thousands) The following table details the activity for the allowance for doubtful accounts. Balance at December 31, 2015 Additions Deductions Balance at December 31, 2016 Allowance for Doubtful Accounts - Straight Line Rent $ 581 $ 824 $ (875 ) $ 530 Allowance for Doubtful Accounts - Accounts Receivable 6,317 4,950 (4,465 ) 6,802 Total $ 6,898 $ 5,774 $ (5,340 ) $ 7,332 Balance at December 31, 2014 Additions Deductions Balance at December 31, 2015 Allowance for Doubtful Accounts - Straight Line Rent $ 910 $ 1,233 $ (1,562 ) $ 581 Allowance for Doubtful Accounts - Accounts Receivable 6,490 4,246 (4,419 ) 6,317 Total $ 7,400 $ 5,479 $ (5,981 ) $ 6,898 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

Schedule III

Schedule III	12 Months Ended
	Dec. 31, 2016
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate and Accumulated Depreciation	LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 1467 Perryman Road Aberdeen, MD $ — $ 12,052,635 $ — $ 35,350,875 $ 12,334,030 $ 35,069,480 $ 47,403,510 $ 2,319,303 1984 5 - 40 1501 Perryman Road Aberdeen, MD — 5,813,324 18,874,059 6,232,539 5,816,839 25,103,083 30,919,922 6,723,493 1985 5 - 40 869 S Route 53 Addison, IL — 1,194,223 4,201,881 77,652 1,194,223 4,279,534 5,473,757 424,062 1985 5 - 40 901 S Route 53 Addison, IL — 2,055,066 5,984,093 863,926 2,055,066 6,848,019 8,903,085 691,088 1985 5 - 40 8620 Congdon Hill Drive Alburtis, PA — 38,328,000 — 36,272,373 38,328,000 36,272,373 74,600,373 176,452 2007 5 - 40 200 Boulder Drive Allentown, PA — 4,722,683 18,922,645 942,589 4,722,683 19,865,234 24,587,917 6,156,414 1985 5 - 40 250 Boulder Drive Allentown, PA — 3,599,936 12,099,145 2,149,322 3,717,733 14,130,670 17,848,403 5,107,522 2000 5 - 40 400 Nestle Way Allentown, PA — 8,065,500 — 27,983,513 8,184,096 27,864,917 36,049,013 14,944,604 2013 5 - 40 650 Boulder Drive Allentown, PA — 5,208,248 — 32,429,833 9,961,788 27,676,293 37,638,081 9,833,900 2013 5 - 40 651 Boulder Drive Allentown, PA — 4,308,646 — 17,844,894 4,308,646 17,844,894 22,153,540 8,892,782 2013 5 - 40 700 Nestle Way Allentown, PA — 3,473,120 — 20,222,715 4,174,970 19,520,865 23,695,835 10,529,674 2006 5 - 40 705 Boulder Drive Allentown, PA — 10,594,027 — 28,813,401 10,596,767 28,810,661 39,407,428 14,298,681 2011 5 - 40 7165 Ambassador Drive Allentown, PA — 792,999 — 4,644,609 804,848 4,632,760 5,437,608 2,031,336 2011 5 - 40 7248 Industrial Boulevard Allentown, PA — 2,670,849 13,307,408 4,759,556 2,670,673 18,067,140 20,737,813 9,018,935 2013 5 - 40 7339 Industrial Boulevard Allentown, PA — 1,187,776 — 7,592,257 1,197,447 7,582,586 8,780,033 3,913,214 2013 5 - 40 7437 Industrial Boulevard Allentown, PA — 717,488 5,022,413 3,449,601 726,651 8,462,850 9,189,501 5,213,645 2013 5 - 40 8014 Industrial Boulevard Allentown, PA — 4,019,258 — 10,000,352 3,645,117 10,374,493 14,019,610 5,143,974 2015 5 - 40 8150 Industrial Boulevard Allentown, PA — 2,564,167 — 9,479,952 2,571,466 9,472,653 12,044,119 3,528,379 2013 5 - 40 8250 Industrial Boulevard Allentown, PA — 1,025,667 — 5,066,872 1,035,854 5,056,685 6,092,539 1,799,894 2013 5 - 40 8400 Industrial Boulevard Allentown, PA — 6,725,948 — 27,402,564 7,521,211 26,607,301 34,128,512 7,412,738 2013 5 - 40 6330 Hedgewood Drive Allentown, PA — 531,268 — 6,074,622 532,047 6,073,843 6,605,890 3,836,591 2013 5 - 40 6350 Hedgewood Drive Allentown, PA — 360,027 — 4,526,060 560,691 4,325,396 4,886,087 2,458,586 2013 5 - 40 6370 Hedgewood Drive Allentown, PA — 540,795 — 4,121,035 541,459 4,120,371 4,661,830 2,427,731 2016 5 - 40 6390 Hedgewood Drive Allentown, PA — 707,203 — 3,138,461 707,867 3,137,797 3,845,664 1,903,126 1995 5 - 40 6520 Stonegate Drive Allentown, PA — 453,315 — 1,873,771 484,361 1,842,725 2,327,086 1,050,115 1985 5 - 40 6540 Stonegate Drive Allentown, PA — 422,042 — 5,271,389 422,730 5,270,701 5,693,431 2,904,488 2013 5 - 40 6560 Stonegate Drive Allentown, PA — 458,281 — 3,812,638 458,945 3,811,974 4,270,919 2,117,790 2013 5 - 40 6580 Snowdrift Road Allentown, PA — 388,328 — 4,876,767 389,081 4,876,014 5,265,095 3,025,010 2014 5 - 40 7620 Cetronia Road Allentown, PA — 1,091,806 3,851,456 445,980 1,093,724 4,295,518 5,389,242 2,265,098 2013 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 700 Uline Way Allentown, PA — 26,311,300 — 75,988,219 30,712,602 71,586,917 102,299,519 519,191 2013 5 - 40 800 Uline Way Allentown, PA — 14,754,000 — 41,114,385 17,126,315 38,742,070 55,868,385 376,857 2013 5 - 40 3095 Presidential Drive Atlanta, GA — 200,351 1,729,161 244,810 200,351 1,973,971 2,174,322 244,124 2006 5 - 40 3097 Presidential Drive Atlanta, GA — 188,680 1,721,048 166,204 188,680 1,887,252 2,075,932 203,086 2014 5 - 40 7030 Buford Highway NE Atlanta, GA — * 919,850 4,051,340 937,692 919,850 4,989,032 5,908,882 646,951 2006 5 - 40 Barton 150 Barton Under Needwood, UK — 2,196,955 13,643,981 (4,029,838 ) 1,638,063 10,173,035 11,811,098 995,308 2013 5 - 40 1055-1071 Kingsland Drive Batavia, IL — 727,294 2,367,529 686,568 727,294 3,054,097 3,781,391 366,744 2013 5 - 40 4606 Richlynn Drive Belcamp, MD — 299,600 1,818,861 712,788 299,600 2,531,649 2,831,249 1,104,502 2013 5 - 40 11800 Baltimore Avenue Beltsville,MD — 2,769,962 1,829,028 278,794 2,663,725 2,214,060 4,877,785 313,325 2014 5 - 40 11850 Baltimore Avenue Beltsville,MD — 3,595,044 2,415,132 145,949 3,457,162 2,698,963 6,156,125 477,203 2016 5 - 40 11900 Baltimore Avenue Beltsville,MD — 3,492,036 2,024,038 366,205 3,358,104 2,524,175 5,882,279 524,742 2016 5 - 40 12104 Indian Creek Court Beltsville,MD — 2,021,752 2,503,802 397,174 2,021,752 2,900,976 4,922,728 581,288 2013 5 - 40 12200 Indian Creek Court Beltsville,MD — 1,347,882 1,460,291 614,057 1,347,882 2,074,348 3,422,230 266,439 2007 5 - 40 12240 Indian Creek Court Beltsville,MD — 1,479,307 2,159,997 781,160 1,479,307 2,941,158 4,420,465 343,319 2013 5 - 40 1071 Thorndale Avenue Bensenville,IL — 2,173,006 2,280,788 279,776 2,016,715 2,716,855 4,733,570 362,273 2014 5 - 40 1260-1274 Ellis Street Bensenville,IL — * 2,298,560 4,020,382 360,126 2,298,560 4,380,508 6,679,068 578,737 2008 5 - 40 371-377 Meyer Road Bensenville,IL — * 1,903,423 3,563,953 264,360 1,903,423 3,828,313 5,731,736 478,694 2013 5 - 40 850-880 Devon Ave Bensenville,IL — * 2,958,756 7,959,013 780,065 2,958,756 8,739,078 11,697,834 1,049,558 2013 5 - 40 10 Emery Street Bethlehem, PA — 5,591,216 32,941,818 7,265,580 8,947,574 36,851,040 45,798,614 2,929,841 2004 5 - 40 2785 Commerce Center Boulevard Bethlehem, PA — 11,961,623 — 46,707,077 12,009,985 46,658,715 58,668,700 4,358,917 2013 5 - 40 1455 Remington Boulevard Bolingbrook, IL — 2,501,294 10,704,719 1,170 2,501,294 10,705,889 13,207,183 1,169,697 2013 5 - 40 150 E Crossroads Parkway Bolingbrook, IL — * 3,078,949 14,143,377 1,124,578 3,078,949 15,267,955 18,346,904 1,712,589 2005 5 - 40 553 S Joliet Ave Bolingbrook, IL — * 3,764,831 15,109,947 1,469,069 3,764,831 16,579,016 20,343,847 2,205,965 2005 5 - 40 400 Boulder Drive Breinigsville, PA — 2,859,106 — 10,599,615 2,865,575 10,593,146 13,458,721 3,358,912 2013 5 - 40 8201 Industrial Boulevard Breinigsville, PA — 2,089,719 — 8,353,910 2,222,168 8,221,461 10,443,629 2,235,927 2013 5 - 40 8500 Industrial Boulevard Breinigsville, PA — 8,752,708 — 40,133,665 11,511,499 37,374,874 48,886,373 10,316,766 2013 5 - 40 860 Nestle Way Breinigsville, PA — 8,118,881 18,885,486 7,520,945 8,118,881 26,406,431 34,525,312 9,758,985 2013 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 1485 W. Commerce Avenue Carlisle, PA — 4,249,868 13,886,039 2,344,063 4,095,262 16,384,708 20,479,970 6,463,352 2013 5 - 40 40 Logistics Drive Carlisle, PA — 7,981,850 — 33,016,988 8,081,272 32,917,566 40,998,838 4,140,856 2013 5 - 40 135-195 East Elk Trail Carol Stream, IL — 4,873,094 12,430,320 2,229,287 4,873,094 14,659,607 19,532,701 1,144,752 2013 5 - 40 515 Kehoe Boulevard Carol Stream, IL — 5,523,427 14,581,705 1,016,882 5,523,427 15,598,587 21,122,014 1,366,471 2013 5 - 40 1413 Bradley Lane Carrollton, TX — * 247,477 2,028,322 83,523 247,477 2,111,845 2,359,322 256,594 2005 5 - 40 3200 Belmeade Drive Carrollton, TX — 1,042,453 8,027,974 424,957 1,042,453 8,452,931 9,495,384 917,970 2001 5 - 40 1475 Nitterhouse Dr Chambersburg, PA — 7,081,007 39,002,011 2,091,556 7,081,007 41,093,567 48,174,574 4,663,680 2001 5 - 40 95 Kriner Road Chambersburg, PA — 8,695,501 — 35,058,041 9,407,871 34,345,671 43,753,542 8,074,404 2004 5 - 40 9000 109th Street Champlin, MN — 1,251,043 11,662,995 119,919 1,251,043 11,782,914 13,033,957 1,803,401 1995 5 - 40 11701 Goodrich Drive Charlotte, NC — 2,054,621 6,356,151 847,042 2,054,621 7,203,192 9,257,813 1,429,290 1996 5 - 40 12810 Virkler Drive Charlotte, NC — 475,368 2,367,586 803,884 476,262 3,170,575 3,646,837 469,072 1997 5 - 40 2700 Hutchinson McDonald Road Charlotte, NC — 912,500 4,721,259 322,907 912,500 5,044,166 5,956,666 771,151 1997 5 - 40 2701 Hutchinson McDonald Road Charlotte, NC — 1,275,000 4,649,750 630,260 1,275,000 5,280,010 6,555,010 846,716 2006 5 - 40 2730 Hutchinson McDonald Road Charlotte, NC — 1,878,750 10,129,499 32,484 1,878,750 10,161,983 12,040,733 1,440,018 2015 5 - 40 2801 Hutchinson McDonald Road Charlotte, NC — 1,065,000 6,975,250 605,167 1,065,000 7,580,417 8,645,417 1,104,601 1989 5 - 40 3000 Crosspoint Center Lane Charlotte, NC — 1,831,250 10,779,412 1,100,142 1,831,250 11,879,554 13,710,804 1,710,855 1989 5 - 40 3005 Crosspoint Center Lane Charlotte, NC — 1,990,000 6,561,540 1,171,719 1,990,000 7,733,259 9,723,259 1,040,722 1988 5 - 40 4045 Perimeter West Drive Charlotte, NC — 1,418,928 7,511,050 183,383 1,418,928 7,694,433 9,113,361 1,198,063 1989 5 - 40 4047 Perimeter West Drive Charlotte, NC — 1,279,004 — 6,399,096 1,279,004 6,399,096 7,678,100 886,370 2013 5 - 40 4525 Statesville Road Charlotte, NC — 841,250 5,279,315 316,750 837,144 5,600,171 6,437,315 807,037 2013 5 - 40 4835 Sirona Drive Charlotte, NC 3,429,062 690,750 5,086,388 132,973 690,750 5,219,361 5,910,111 618,965 2013 5 - 40 4925 Sirona Drive Charlotte, NC 3,445,719 603,003 4,969,011 146,835 603,003 5,115,846 5,718,849 686,589 2013 5 - 40 5032 Sirona Drive Charlotte, NC — 1,416,763 — 9,029,649 1,416,763 9,029,649 10,446,412 162,570 2013 5 - 40 5033 Sirona Drive Charlotte, NC 2,931,771 509,247 4,710,218 183,541 613,962 4,789,044 5,403,006 605,740 2013 5 - 40 5039 Sirona Drive Charlotte, NC — 1,027,500 6,172,807 62,651 1,027,500 6,235,458 7,262,958 354,708 2010 5 - 40 8910 Pioneer Avenue Charlotte, NC — 527,873 4,959,206 287,144 527,873 5,246,350 5,774,223 648,191 2010 5 - 40 8916 Pioneer Avenue Charlotte, NC — 557,730 5,785,333 461,744 557,730 6,247,077 6,804,807 923,373 2013 5 - 40 8924 Pioneer Avenue Charlotte, NC — 654,713 5,365,823 — 654,713 5,365,823 6,020,536 5,466 2013 5 - 40 2601 Indian River Road Chesapeake, VA — * 1,711,746 10,418,032 460,727 1,711,746 10,878,759 12,590,505 1,250,668 2016 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 1540 S 54th Avenue Cicero, IL — 3,540,236 20,130,552 928,916 3,540,236 21,059,468 24,599,704 2,292,856 2000 5 - 40 4650 Lake Forest Drive Cincinnati, OH — 1,030,242 4,003,024 224,716 1,030,242 4,227,739 5,257,981 516,067 1999 5 - 40 4750 Lake Forest Drive Cincinnati, OH — 1,138,166 5,914,789 230,172 1,138,166 6,144,961 7,283,127 729,876 2007 5 - 40 9645 Gerwig Lane Columbia, MD — 1,915,960 6,461,228 320,391 1,915,960 6,781,619 8,697,579 838,295 2013 5 - 40 2550 John Glenn Avenue Columbus, OH — 540,601 5,129,342 835,318 540,601 5,964,660 6,505,261 600,700 2013 5 - 40 3800 Twin Creeks Drive Columbus, OH — 549,393 4,643,302 499,543 549,393 5,142,845 5,692,238 538,373 2013 5 - 40 330 South Royal Lane Coppell, TX — 2,091,426 — 11,402,325 2,091,426 11,402,325 13,493,751 463,175 2013 5 - 40 455 Airline Drive Coppell, TX — * 312,701 2,311,531 742,190 312,701 3,053,721 3,366,422 587,157 2013 5 - 40 2130 Baldwin Avenue Crofton, MD — 3,172,032 7,350,782 418,907 3,172,032 7,769,689 10,941,721 908,002 2013 5 - 40 11020 Holly Lane Dayton, MN — 2,536,731 — 12,256,969 2,536,731 12,256,969 14,793,700 157,560 2011 5 - 40 329-333 Herrod Blvd Dayton, NJ — * 4,039,559 20,863,051 2,285,014 4,039,559 23,148,065 27,187,624 2,515,094 2013 5 - 40 1250 Hall Court Deer Park, TX — 829,570 4,778,327 120,899 831,611 4,897,185 5,728,796 1,310,568 2013 5 - 40 333 Howard Avenue Des Plaines, IL — 7,928,724 — 14,263,106 7,928,724 14,263,106 22,191,830 334,384 2014 5 - 40 1680 Executive Drive Duluth, GA — 1,928,412 4,651,819 573,627 1,928,412 5,225,446 7,153,858 831,701 2012 5 - 40 1700 Executive Drive Duluth, GA — 1,082,072 2,496,599 549,432 1,082,072 3,046,031 4,128,103 452,838 2013 5 - 40 2670 Breckinridge Blvd Duluth, GA — 1,676,415 4,567,592 927,127 1,676,415 5,494,720 7,171,135 637,871 2013 5 - 40 170 Parkway West Duncan, SC — 598,348 3,643,756 549,357 598,918 4,192,543 4,791,461 1,205,279 2014 5 - 40 190 Parkway West Duncan, SC — 551,663 3,310,993 251,300 552,211 3,561,744 4,113,955 969,780 1997 5 - 40 265 Parkway East Duncan, SC — 901,444 5,751,389 193,199 902,374 5,943,658 6,846,032 1,915,845 2013 5 - 40 285 Parkway East Duncan, SC — 975,433 5,851,990 413,247 976,393 6,264,277 7,240,670 1,712,719 1997 5 - 40 1000 Parliament Court Durham, NC — 2,229,000 7,064,506 603,830 2,229,000 7,668,336 9,897,336 534,490 2005 5 - 40 4226 Surles Court Durham, NC — 1,440,000 7,932,265 163,047 1,440,000 8,095,312 9,535,312 763,084 2013 5 - 40 4227 Surles Court Durham, NC — 1,500,000 5,624,030 214,857 1,500,000 5,838,886 7,338,886 378,331 1997 5 - 40 4234 Surles Court Durham, NC — 1,440,000 7,356,161 (4,933 ) 1,440,000 7,351,228 8,791,228 649,580 2005 5 - 40 4300 Emperor Center Durham, NC — 1,576,500 4,240,961 (8,916 ) 1,576,500 4,232,045 5,808,545 305,053 2002 5 - 40 1957 TW Alexander Drive Durham, NC — 1,844,943 — 7,938,998 3,091,046 6,692,895 9,783,941 1,131 2013 5 - 40 3169 Dodd Road Eagan, MN — 988,594 6,586,907 6,464 988,594 6,593,371 7,581,965 928,496 2001 5 - 40 3711 Kennebec Drive Eagan, MN — 999,702 4,042,589 325,995 999,702 4,368,584 5,368,286 966,648 2004 5 - 40 917 Lone Oak Road Eagan, MN — * 1,493,115 6,120,455 609,183 1,493,115 6,729,638 8,222,753 873,373 1999 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 10301-10305 West 70th Street Eden Prairie, MN — 120,622 1,085,226 310,312 118,300 1,397,860 1,516,160 643,228 2013 5 - 40 10321 West 70th Street Eden Prairie, MN — 145,198 1,305,700 578,495 142,399 1,886,994 2,029,393 892,182 2013 5 - 40 10333 West 70th Street Eden Prairie, MN — 110,746 995,868 285,802 108,610 1,283,806 1,392,416 611,942 2013 5 - 40 10349-10357 West 70th Street Eden Prairie, MN — 275,903 2,481,666 900,007 270,584 3,386,992 3,657,576 1,712,016 2007 5 - 40 10365-10375 West 70th Street Eden Prairie, MN — 291,077 2,618,194 1,530,128 285,464 4,153,935 4,439,399 1,737,212 2007 5 - 40 10393-10394 West 70th Street Eden Prairie, MN — 269,618 2,423,318 2,269,368 264,419 4,697,885 4,962,304 1,895,959 2011 5 - 40 7075 Flying Cloud Drive Eden Prairie, MN — 10,232,831 10,855,851 4,331,163 10,243,977 15,175,867 25,419,844 2,955,224 2013 5 - 40 7078 Shady Oak Road Eden Prairie, MN — 343,093 3,085,795 1,528,369 336,481 4,620,776 4,957,257 2,436,859 2013 5 - 40 7777 Golden Triangle Drive Eden Prairie, MN — 993,101 2,136,862 881,416 993,101 3,018,277 4,011,378 1,231,573 2013 5 - 40 2250 Arthur Avenue Elk Grove, IL — 1,403,196 2,386,396 149,086 1,403,196 2,535,482 3,938,678 296,511 2006 5 - 40 6600 Business Parkway Elkridge, MD — 3,680,220 14,671,910 701,811 3,680,220 15,373,721 19,053,941 1,493,289 2013 5 - 40 6675 Business Parkway Elkridge, MD — * 2,421,854 9,730,192 566,777 2,421,854 10,296,969 12,718,823 1,042,430 2007 5 - 40 7351 Coca Cola Drive Elkridge, MD — 1,897,044 — 7,410,314 3,023,417 6,283,941 9,307,358 1,815,210 2007 5 - 40 21705-21707 Mississippi Street Elwood, IL — 10,594,259 30,329,802 895,205 10,594,259 31,225,008 41,819,267 4,440,370 2000 5 - 40 27143 S. Baseline Road Elwood, IL — 6,022,000 5,612,934 318,163 6,022,000 5,931,097 11,953,097 925,484 2004 5 - 40 1800 Donaldson Road Erlanger, KY — — 13,211,604 709,891 — 13,921,495 13,921,495 3,004,403 2004 5 - 40 6880 Fairfield Drive Fairfield, OH — 412,136 3,029,177 155,862 412,136 3,185,039 3,597,175 340,785 2004 5 - 40 7000-7018 Fairfield Business Fairfield, OH — 367,925 2,205,817 144,414 386,928 2,331,228 2,718,156 246,535 2012 5 - 40 10721 Jasmine Street Fontana, CA — 11,427,061 23,784,779 2,353,817 11,427,061 26,138,596 37,565,657 1,035,397 2013 5 - 40 2000 Southpointe Dr Forest Park, GA — 756,221 9,115,626 626,719 756,221 9,742,345 10,498,566 1,116,707 2013 5 - 40 1400 NW 65th Place Fort Lauderdale, FL — 545,480 2,540,210 66,119 545,480 2,606,329 3,151,809 259,627 2013 5 - 40 6500 NW 12th Avenue Fort Lauderdale, FL — — 3,064,734 411,144 — 3,475,878 3,475,878 398,203 2013 5 - 40 6501 NW 12th Avenue Fort Lauderdale, FL — 519,984 2,677,465 43,251 519,984 2,720,716 3,240,700 247,442 2013 5 - 40 6600 NW 12th Avenue Fort Lauderdale, FL — — 2,988,181 274,482 — 3,262,663 3,262,663 386,938 2013 5 - 40 11222 Melrose Avenue Franklin Park, IL — 2,999,106 4,658,605 153,158 2,999,106 4,811,763 7,810,869 127,245 2013 5 - 40 9601 Cosner Drive Fredericksburg, VA — 475,262 3,917,234 242,595 475,262 4,159,829 4,635,091 2,250,921 2013 5 - 40 5410 - 5430 Northwest 33rd Avenue Ft. Lauderdale, FL — 603,776 4,176,238 1,976,991 625,111 6,131,894 6,757,005 3,000,812 1985 5 - 40 12601 Industry Street Garden Grove, CA — 2,048,143 1,088,697 70,518 2,048,143 1,159,215 3,207,358 223,297 2013 5 - 40 12641 Industry Street Garden Grove, CA — 3,766,822 2,539,214 132,812 3,766,822 2,672,026 6,438,848 315,709 2013 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 12681-12691 Pala Drive Garden Grove, CA — 5,221,102 3,225,596 83,450 5,220,148 3,310,000 8,530,148 261,465 2014 5 - 40 850 S Jupiter Road Garland, TX — 799,707 6,122,065 505,061 799,707 6,627,126 7,426,833 752,290 2013 5 - 40 2510 W Main Street Grand Prairie, TX — * 1,785,741 11,158,818 882,172 1,785,741 12,040,990 13,826,731 1,646,773 2013 5 - 40 4251 North Highway 121 Grapevine, TX — * 1,165,780 7,799,270 422,213 1,165,780 8,221,482 9,387,262 1,009,876 2013 5 - 40 1150 Pleasant Ridge Road Greensboro, NC — 1,547,811 — 14,208,812 3,712,683 12,043,940 15,756,623 2,616,841 2006 5 - 40 25 Brookfield Oaks Drive Greenville, SC — 288,823 3,441,512 43,182 288,823 3,484,694 3,773,517 374,491 2014 5 - 40 45 Brookfield Oaks Drive Greenville, SC — 818,114 — 4,470,587 825,529 4,463,172 5,288,701 1,144,890 2006 5 - 40 2011 Southtech Drive Greenwood, IN — 223,702 3,574,142 349,736 223,702 3,923,878 4,147,580 515,529 2013 5 - 40 2121 Southtech Drive Greenwood, IN — 272,823 3,606,920 425,965 272,823 4,032,886 4,305,709 674,940 2013 5 - 40 800 Commerce Parkway West Dr Greenwood, IN — 1,374,664 29,963,830 1,616,774 1,374,664 31,580,604 32,955,268 3,605,585 2013 5 - 40 110 Caliber Ridge Dr Greer, SC — 555,549 — 6,331,166 1,228,880 5,657,835 6,886,715 325,933 2014 5 - 40 120 Caliber Ridge Dr Greer, SC — 1,243,100 — 6,590,252 1,243,100 6,590,252 7,833,352 257,972 2016 5 - 40 130 Caliber Ridge Dr Greer, SC — 1,171,160 — 6,034,563 1,171,160 6,034,563 7,205,723 135,801 2016 5 - 40 140 Caliber Ridge Drive Greer, SC — 1,243,100 — 6,426,293 1,243,100 6,426,293 7,669,393 395,610 2015 5 - 40 1487 South Highway 101 Greer, SC — 464,237 — 5,829,595 1,301,738 4,992,094 6,293,832 1,011,407 2007 5 - 40 2727 London Grove Road Groveport, OH — 1,875,607 11,937,935 1,672,294 1,875,607 13,610,229 15,485,836 1,592,762 2013 5 - 40 11835 Newgate Boulevard Hagerstown, MD — 14,121,622 — 23,019,069 14,121,622 23,019,069 37,140,691 1,429,004 2015 5 - 40 11841 Newgate Boulevard Hagerstown, MD — 3,356,207 — 30,566,609 9,741,685 24,181,131 33,922,816 5,846,534 2008 5 - 40 1560 Hunter Road Hanover Park, IL — * 2,639,734 12,310,741 1,125,886 2,639,734 13,436,627 16,076,361 1,418,917 2013 5 - 40 1575 Hunter Road Hanover Park, IL — * 3,293,284 17,235,926 1,159,989 3,293,284 18,395,915 21,689,199 2,021,398 2013 5 - 40 7361 Coca Cola Drive Hanover, MD — 2,245,187 — 9,419,956 3,822,710 7,842,433 11,665,143 1,629,408 2004 5 - 40 7460 New Ridge Road Hanover, MD — 3,785,446 — 7,658,893 3,796,023 7,648,316 11,444,339 333,250 2015 5 - 40 7462 New Ridge Road Hanover, MD — 4,059,337 — 7,481,893 4,070,629 7,470,601 11,541,230 325,162 2015 5 - 40 500 McCarthy Drive Harrisburg, PA — 5,194,872 19,991,436 5,018,136 5,687,013 24,517,431 30,204,444 8,376,356 2005 5 - 40 600 Industrial Drive Harrisburg, PA — 7,743,800 — 29,159,534 9,368,557 27,534,777 36,903,334 8,663,016 2005 5 - 40 7195 Grayson Road Harrisburg, PA — 464,534 6,066,272 243,707 464,534 6,309,979 6,774,513 654,034 2013 5 - 40 7253 Grayson Road Harrisburg, PA — 954,130 10,585,367 547,545 954,130 11,132,912 12,087,042 1,069,407 2013 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 12537 Cerise Avenue Hawthorne, CA — 2,203,194 5,758,809 94,181 2,203,194 5,852,990 8,056,184 649,501 2013 5 - 40 1010 Petersburg Road Hebron, KY — 305,471 5,434,505 (819,916 ) 305,471 4,614,589 4,920,060 627,848 2013 5 - 40 785 Lindbergh Court Hebron, KY — 401,410 3,087,899 511,543 401,410 3,599,442 4,000,852 612,450 2013 5 - 40 805 Lindbergh Court Hebron, KY — 292,096 2,502,486 163,618 292,096 2,666,103 2,958,199 354,922 2013 5 - 40 825 Lindbergh Court Hebron, KY — 370,149 3,095,116 427,153 370,149 3,522,270 3,892,419 469,314 2013 5 - 40 845 Lindbergh Court Hebron, KY — 444,318 3,811,889 257,404 444,318 4,069,293 4,513,611 510,796 2013 5 - 40 1498 Eagle Hill Drive High Point, NC — 94,274 — 6,174,627 791,880 5,477,021 6,268,901 1,470,238 2005 5 - 40 4183 Eagle Hill Drive High Point, NC — 122,203 — 3,216,383 526,266 2,812,320 3,338,586 1,209,332 2001 5 - 40 4189 Eagle Hill Drive High Point, NC — 100,106 — 3,610,018 431,106 3,279,018 3,710,124 1,596,673 2001 5 - 40 4195 Eagle Hill Drive High Point, NC — 107,586 — 3,391,467 505,700 2,993,353 3,499,053 893,968 2004 5 - 40 4328, 4336 Federal Drive High Point, NC 539,575 521,122 — 5,278,965 825,092 4,974,995 5,800,087 2,396,029 1995 5 - 40 4344 Federal Drive High Point, NC — 484,001 — 3,113,990 173,623 3,424,368 3,597,991 1,769,967 1996 5 - 40 4380 Federal Drive High Point, NC — 282,996 — 2,209,513 283,368 2,209,141 2,492,509 1,125,857 1997 5 - 40 4388 Federal Drive High Point, NC — 143,661 — 1,214,707 132,655 1,225,713 1,358,368 613,784 1997 5 - 40 4475 Premier Drive High Point, NC — 748,693 — 6,806,479 1,525,421 6,029,751 7,555,172 1,279,125 2006 5 - 40 4485 Premier Drive High Point, NC — 1,827,595 — 2,597,239 1,044,288 3,380,546 4,424,834 43,002 2015 5 - 40 4500 Green Point Drive High Point, NC — 230,622 — 2,744,942 231,692 2,743,872 2,975,564 1,509,824 1989 5 - 40 4501 Green Point Drive High Point, NC — 319,289 — 3,110,458 320,450 3,109,297 3,429,747 1,850,162 1989 5 - 40 4523 Green Point Drive High Point, NC — 234,564 — 3,280,376 235,698 3,279,242 3,514,940 2,138,014 1988 5 - 40 4524 Green Point Drive High Point, NC — 182,810 — 2,815,190 183,888 2,814,112 2,998,000 1,690,876 1989 5 - 40 Unit 5 Logix Road Hinckley, UK — 10,547,677 29,691,911 (10,236,705 ) 7,864,413 22,138,470 30,002,883 2,341,916 2013 5 - 40 1515 6th Street South Hopkins,MN — 813,036 1,503,075 362,817 813,036 1,865,892 2,678,928 384,705 2013 5 - 40 1600 5th Street South Hopkins,MN — 339,336 2,106,454 80,794 339,336 2,187,249 2,526,585 229,679 2013 5 - 40 1000 South Loop West Houston, TX — * 509,351 3,549,504 871,341 509,351 4,420,845 4,930,196 614,631 2013 5 - 40 10241 W Little York Rd Houston, TX — 558,491 5,740,552 133,643 558,491 5,874,195 6,432,686 575,354 2013 5 - 40 10245 W Little York Rd Houston, TX — 426,927 3,460,513 379,988 426,927 3,840,501 4,267,428 595,671 2013 5 - 40 10301 Round Up Lane Houston, TX — 545,501 2,927,700 1,023,687 545,501 3,951,386 4,496,887 543,738 2010 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 10305 Round Up Lane Houston, TX — 1,340,609 7,489,720 2,927,548 1,340,609 10,417,267 11,757,876 1,963,470 2010 5 - 40 1050 Greens Parkway Houston, TX — 973,482 — 3,627,200 992,093 3,608,589 4,600,682 251,402 2015 5 - 40 10607 Haddington Drive Houston, TX — * 201,469 1,631,561 132,607 201,469 1,764,169 1,965,638 215,692 2013 5 - 40 10720 West Sam Houston Pkwy N Houston, TX — 3,871,875 — 28,945,116 3,871,875 28,945,116 32,816,991 737,940 2016 5 - 40 10735 West Little York Road Houston, TX — 1,110,988 6,351,946 3,220,697 1,135,483 9,548,148 10,683,631 3,141,008 2000 5 - 40 10739 West Little York Road Houston, TX — 797,931 5,950,894 527,409 799,560 6,476,674 7,276,234 2,438,811 1999 5 - 40 11201 Greens Crossing Boulevard Houston, TX — 1,006,194 5,412,584 2,609,554 1,008,542 8,019,790 9,028,332 2,309,645 2007 5 - 40 11220 Ella Boulevard Houston, TX — 1,505,855 — 7,397,354 1,534,644 7,368,565 8,903,209 348,583 2015 5 - 40 1283 N Post Oak Rd Houston, TX — * 80,730 870,656 145,476 80,730 1,016,132 1,096,862 135,165 2013 5 - 40 1287 N Post Oak Rd Houston, TX — * 146,654 1,620,780 59,710 146,654 1,680,489 1,827,143 236,879 2013 5 - 40 1291 N Post Oak Rd Houston, TX — * 510,102 4,129,042 561,970 510,102 4,691,012 5,201,114 579,918 2013 5 - 40 1416 N Sam Houston Parkway E Houston, TX — * 218,850 1,639,902 556,292 218,850 2,196,193 2,415,043 301,676 2013 5 - 40 1420 N Sam Houston Parkway E Houston, TX — * 211,279 1,554,156 116,306 211,279 1,670,462 1,881,741 208,672 2013 5 - 40 14200 Hollister Road Houston, TX — 1,396,794 — 4,859,739 1,699,632 4,556,901 6,256,533 531,845 2011 5 - 40 1424 N Sam Houston Parkway E Houston, TX — * 283,107 2,077,323 416,964 283,107 2,494,287 2,777,394 291,827 2013 5 - 40 1428 N Sam Houston Parkway E Houston, TX — * 367,446 1,952,453 183,185 367,446 2,135,637 2,503,083 259,350 2013 5 - 40 14300 Hollister Road Houston, TX — * 1,377,193 — 5,679,691 1,405,899 5,650,985 7,056,884 503,260 2014 5 - 40 14400 Hollister Road Houston, TX — * 1,830,419 — 7,239,740 1,861,540 7,208,619 9,070,159 1,322,096 2012 5 - 40 15102 Sommermeyer St Houston, TX — 755,121 3,155,774 247,397 755,121 3,403,171 4,158,292 446,988 2013 5 - 40 15150 Sommermeyer St Houston, TX — 418,580 1,564,587 230,574 418,580 1,795,161 2,213,741 245,069 2013 5 - 40 16330 Central Green Boulevard Houston, TX — 1,540,109 — 8,528,507 1,966,472 8,102,144 10,068,616 617,774 2014 5 - 40 16405 Air Center Boulevard Houston, TX — 438,853 3,030,396 552,188 438,853 3,582,584 4,021,437 1,828,930 1997 5 - 40 16420 West Hardy Road Houston, TX — 529,876 3,267,872 405,158 529,876 3,673,030 4,202,906 425,317 2013 5 - 40 16445 Air Center Boulevard Houston, TX — 363,339 2,509,186 364,183 363,339 2,873,369 3,236,708 1,339,476 1997 5 - 40 1646 Rankin Road Houston, TX — 329,961 — 5,128,210 592,234 4,865,937 5,458,171 1,424,604 2005 5 - 40 1655 Townhurst Drive Houston, TX — * 197,226 935,036 528,658 197,226 1,463,694 1,660,920 240,071 2013 5 - 40 16580 Air Center Boulevard Houston, TX — 289,000 3,559,857 1,285,142 289,000 4,845,000 5,134,000 1,956,500 1997 5 - 40 LIBERTY PROPERTY TRUST AND LIBERTY PROPERTY LIMITED PARTNERSHIP SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION AS OF DECEMBER 31, 2016 Initial Cost Gross Amount Carried at End of Period Project Location Encumbrances (1) Land Building Costs Capitalized Subsequent to Acquisition (2) Land and Improvements Building and Improvements Total 12/31/2016 Accumulated Depreciation 12/31/2016 Date of Construction or Acquisition Depreciable life (years) OPERATING PROPERTIES 16602 Central Green Boulevard Houston, TX — 284,403 — 5,461,695 503,779 5,242,319 5,746,098 1,435,142 2005 5 - 40 16605 Air Center Boulevard Houston, TX — 298,999 — 3,423,751 496,186 3,226,564 3,722,750 1,190,212 2002 5 - 40 1665 Townhurst Drive Houston, TX — * 452,439 2,016,585 535,863 452,439 2,552,447 3,004,886 217,319 2013 5 - 40 16680 Central Green Boulevard Houston, TX — 311,952 — 3,714,116 492,869 3,533,199 4,026,068 769,315 2001 5 - 40 16685 Air Center Boulevard Houston, TX — 414,691 — 2,455,222 414,691 2,455,222 2,869,913 758,065 2004 5 - 40 1755 Trans Central Drive Houston, TX — 293,534 3,036,269 1,336,826 306,147 4,360,482 4,666,629 1,505,006 1999 5 - 40 4301 S Pinemont Dr Houston, TX — * 226,973 1,174,979 142,562 226,973 1,317,541 1,544,514 196,184 2013 5 - 40 4401 S Pinemont Dr Houston, TX — * 244,240 1,412,622 97,515 244,240 1,510,137 1,754,377 247,437 2013 5 - 40 4501 S Pinemont Dr Houston, TX — * 252,907 1,504,053 68,292 252,907 1,572,345 1,825,252 203,559 2013 5 - 40 5200 N. Sam Houston Parkway Houston, TX — 1,519,458 7,135,548 3,703,478 1,520,074 10,838,410 12,358,484 3,288,143 2007 5 - 40 5250 N. Sam Houston Parkway Houston, TX — 2,173,287 8,868,256 2,296,346 2,173,942 11,163,947 13,337,889 2,648,783 2007 5 - 40 5500 N. Sam Houston Parkway West Houston, TX — 1,243,541 — 6,456,833 1,513,152 6,187,222 7,700,374 1,121,080 2011 5 - 40 8017 Pinemont Drive Houston, TX — 900,953 5,323,727 475,338 900,953 5,799,065 6,700,018 588,757 2013 5 - 40 8272 El Rio Street Houston, TX — * 530,494 4,108,626 302,577 530,494 4,411,203 4,941,697 509,990 2013 5 - 40 8282 El Rio Street Houston, TX — * 450,422 3,304,942 1,076,398 450,422 4,381,340 4,831,762 559,879 2013 5 - 40 8301 Fallbrook Drive Houston, TX — 4,515,862 — 26,930,936 7,083,514 24,363,284 31,446,798 5,575,785 2006 5 - 40 8303 Fallbrook Drive Houston, TX — 4,613,370 — 16,411,802 4,858,863 16,166,309 21,025,172 556,508 2015 5 - 40 850 Greens Parkway Houston, TX — 2,893,405 11,593,197 2,914,238 2,899,861 14,500,978 17,400,839 3,371,778 2007 5 - 40 860 Greens Parkway Houston, TX — 1,399,365 6,344,650 1,583,440 1,374,012 7,953,443 9,327,455 1,899,501 2007 5 - 40 8801-19 & 8821-49 Fallbrook Drive Houston, TX — 2,290,001 15,297,141 3,207,265 2,290,002 18,504,405 20,794,407 6,151,203 2000 5 - 40 8802-8824 Fallbrook Drive Houston, TX — 2,774,995 6,364,767 1,373,297 2,775,021 7,738,037 10,513,058 2,800,334 2004 5 - 40 8825-8839 N Sam Houston Pkwy Houston, TX — 638,453 3,258,815 759,249 638,477 4,018,039 4,656,516 1,273,899 2004 5 - 40 8850-8872 Fallbrook Drive Houston, TX — 504,317 2,878,351 1,342,043 504,341 4,220,370 4,724,711 1,565,437 2004 5 - 40 Liberty 11 at Central Green Houston, TX — 1,748,348 — 9,341,500 2,120,319 8,969,529 11,089,848 1,152,770 2012 5 - 40 Cabot III UK1B01 Isle of Man, UK — 11,888,058 35,003,668 (12,081,249 ) 8,863,808 25,946,669 34,810,477 2,411,261 2013 5 - 40 1011 N Hilltop Drive Itasca, IL

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share, Basic and Diluted [Line Items]
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, 2016 . 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.
Use of Estimates	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	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. The Company consolidates joint ventures that are considered to be variable interest entities (“VIEs”) where we are the primary beneficiary. The Company (i) evaluates the sufficiency of the total equity investment at risk, (ii) reviews the voting rights and decision-making authority of the equity investment holders as a group and whether there are any guaranteed returns, protection against losses, or capping of residual returns within the group and (iii) establishes whether activities within the venture are on behalf of an investor with disproportionately few voting rights in making this VIE determination. To the extent that the Company (i) is the sole entity that has the power to direct the activities of the VIE and (ii) has the obligation or rights to absorb the VIE's losses or receive its benefits, then the Company would be the primary beneficiary and would consolidate the VIE. All significant intercompany transactions and accounts have been eliminated.
Real Estate and Depreciation	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 development and 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. The total of capitalized compensation costs directly related to the development of property for the years ended December 31, 2016 , 2015 and 2014 was $7.2 million , $5.5 million and $5.1 million , respectively. Construction related payables at December 31, 2016 and 2015 were $37.1 million and $42.9 million , respectively. The Company allocates the purchase price of real estate acquired to land, building and improvements and intangibles at 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 vacant properties are capitalized and included in net real estate at cost. Beginning on October 1, 2016, with the Company's adoption of ASU 2017-01 (see below), acquisition-related costs for properties with in-place leases are also capitalized and included in net real estate at cost. 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 amortizes 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	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	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 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	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.
Revenue Recognition	Revenue Recognition 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. In the fourth quarter of 2016, the Company entered into an agreement relating to the fee development of an office building at its Camden Waterfront project in Camden, NJ. Project revenues and related costs and expenses are presented on a gross basis as "Development service fee income" and "Development service fee expense" in the Consolidated Statements of Comprehensive Income. Additionally, at the same time, the Company began classifying development fees and expenses relating to its fee development arrangements for certain unconsolidated joint venture projects in a manner consistent with the Camden project described above. Previously, development service fee income relating to its unconsolidated joint ventures had been classified as other income and development service fee expense had been classified as general and administrative expense in amounts as follows: Nine months ended Year ended December 31, September 30, 2016 (unaudited) 2015 2014 Other income $ 3,789 $ 6,159 $ 2,456 General and administrative expense $ 3,210 $ 3,730 $ 1,608 Revenue and expense associated with service fee development is accounted for under the percentage of completion method. Revenues are recognized on the percentage of completion method based on applicable costs incurred with respect to each development agreement. The Company uses the relative sales value method to allocate costs and recognize profits from service fee development. Under the relative sales value method, estimates of aggregate project revenues and aggregate project costs are used to determine the allocation of project cost of sales and the resulting profit in each accounting period. In subsequent periods, cost of sale allocations and the resulting profits are adjusted to reflect changes in the actual and estimated costs and revenues of each project.
Deferred Financing and Leasing Costs	Deferred Financing and Leasing Costs Costs incurred in connection with the financing of the credit facility or leasing are capitalized and amortized on a straight line basis over the term of the related loan or lease. Costs incurred in connection with the financing of mortgage loans or unsecured notes are reported as a deduction from the face amount of that liability and amortized on a straight line basis over the term of the related loan. 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	Fair Value of Financial Instruments ASC 820, Fair Value Measurements and Disclosures, gives guidance on the fair value measurement of a financial asset or liability. Inputs used to develop fair value are classified in one of three categories: Level 1 inputs (quoted prices (unadjusted) in active markets for identical assets or liabilities), Level 2 inputs (inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly) and Level 3 inputs (unobservable inputs for the asset or liability). 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, 2016 and December 31, 2015 . 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 20 - Derivative Instruments. The Company used a discounted cash flow model to determine the estimated fair value of its debt as of December 31, 2016 and December 31, 2015 . 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 Taxes	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 still 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 and state income taxes separate from the Company. 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 itself is also subject to tax in certain states and the United Kingdom. Accordingly, the Company recognizes 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, 2016 , 2015 and 2014 and no interest and penalties accrued at December 31, 2016 or December 31, 2015 which related to any uncertain tax positions or significant unrecognized tax benefits. Certain of the Company's taxable REIT subsidiaries had net operating loss carryforwards available of approximately $30.8 million as of December 31, 2016 . 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 (in prior years) Luxembourg. With few exceptions, the Company and its subsidiaries are no longer subject to examination by taxing authorities in these jurisdictions for years prior to 2010.
Share-based Compensation	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	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 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	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 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 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 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, 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	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/Unit	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.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) ("ASU 2014-15"), which gives guidance regarding management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and provide related footnote disclosures. If conditions or events raise substantial doubt about an entity’s ability to continue as a going concern, and substantial doubt is not alleviated after consideration of management’s plans, an entity should include a statement in the footnotes indicating that there is substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or available to be issued). The new standard is effective for fiscal years ending after December 15, 2016 and for annual and interim periods thereafter. The Company adopted ASU 2014-15 during the fourth quarter of 2016. No additional disclosures were necessary as a result of this adoption. 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 (except revenue in the scope of other accounting standards, including standards related to leasing). The standard clarifies the required factors that an entity must consider when recognizing revenue and requires additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. The standard also provides guidance regarding the measurement of gains and losses relative to the sale of certain nonfinancial assets, including real estate. ASU 2014-09 is effective for the Company beginning January 1, 2018. The Company has performed an initial assessment of ASU 2014-09 and plans to adopt the standard using the modified retrospective approach. Upon adoption of ASU 2016-02 (see below), the majority of our revenue will be subject to the allocation provisions outlined within the revenue standard. The Company is currently evaluating the specific implementation requirements for allocating the consideration within our contracts in accordance with ASU 2014-09 as well as other transactions subject to ASU 2014-09. The Company does not expect the new standard to have a material impact on the measurement and recognition of gains and losses on the sale of properties. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis (Topic 810) ("ASU 2015-02"). The standard requires that all entities re-evaluate and revise consolidation documentation for limited partnerships and similar legal entities. It makes changes to both the variable interest model and voting model. The Company adopted ASU 2015-02 on January 1, 2016. The adoption of ASU 2015-02 did not have a material impact on the Company's financial position and results of operations. In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For leases in which the Company is the lessor, the standard requires that the lease and non-lease components of the lease agreement should be separated. Revenue related to the lease component of the contract will be recognized on a straight-line basis, while revenue related to the non-lease component will be recognized under the provisions of ASU 2014-09 (see above). For lease agreements longer than one year in which the Company is the lessee, the Company will measure the present value of the future lease payments and recognize a right-of-use asset and corresponding lease liability on its balance sheet. In addition, the new standard states that only direct leasing costs may be capitalized. The Company is evaluating the impact ASU 2016-02 will have on its financial position and results of operations. In March 2016, the FASB issued ASU 2016-05, Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships ("ASU 2016-05"). ASU 2016-05 states that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under FASB Topic 815 does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. ASU 2016-05 is effective for the Company beginning January 1, 2017. Early adoption of ASU 2016-05 is permitted. The standard allows application on a prospective or modified retrospective basis. The Company does not believe that ASU 2016-05 will have a material impact on its financial position and results of operations. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 is designed to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for the Company beginning January 1, 2017. Early adoption of ASU 2016-09 is permitted. Certain amendments in the standard are to be applied retrospectively and certain amendments are to be applied prospectively. The Company does not believe that ASU 2016-09 will have a material impact on its financial position and results of operations. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 is designed to clarify how entities should classify cash receipts and cash payments in the statement of cash flows. ASU 2016-15 is effective for the Company beginning January 1, 2018. Early adoption of ASU 2016-15 is permitted. The standard requires retrospective application unless it is impracticable to do so. The Company is evaluating the impact ASU 2016-15 will have on its statement of cash flows. In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business (“ASU 2017-01”). ASU 2017-01 is designed to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses with application of the standard applied on a prospective basis upon adoption. Early adoption is permitted, including for interim or annual periods for which the financial statements have not been issued or made available for issuance. The Company has elected to early adopt ASU 2017-01 beginning on October 1, 2016. The adoption of ASU 2017-01 did not have a material impact on the Company's financial position or results of operations.
Interest Expense Allocated to Discontinued Operations	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.
Accounting for the Impairment or Disposal of Long-Lived Assets	The Company determined these impairments based on third party offer prices and quoted offer prices for comparable transactions which are Level 2 and Level 3 inputs, respectively, according to the fair value hierarchy established in ASC 820. These measurements have occurred throughout the respective periods as circumstances arise, and the resulting estimates of fair value are not necessarily reflective of measurements at the period’s end. The Company has evaluated each of its properties and land held for development and has determined that there were no additional valuation adjustments necessary at December 31, 2016 . The Company applied reasonable estimates and judgments in determining the level of impairments recognized. Should external or internal circumstances change requiring the need to shorten the holding periods or adjust the estimated future cash flows of the Company’s assets, the Company could be required to record impairment charges in the future.
Liberty Property Limited Partnership [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Earnings Per Share/Unit	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.

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Property Deprecation Schedule	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
Fair Value of Mortgage Loans and Unsecured Notes	The following summarizes the fair value of the Company's mortgage loans and unsecured notes at December 31, 2015 and December 31, 2016 (in thousands): Mortgage Loans Unsecured Notes Carrying Value Fair Value Carrying Value Fair Value As of December 31, 2015 $ 307,908 $ 306,334 $ 2,580,108 $ 2,616,395 As of December 31, 2016 $ 276,650 $ 286,684 $ 2,280,286 $ 2,340,762
Schedule of Adjustment to Previously Reported Consolidated Financial Statements	The tables below summarize the effect of the adjustment to previously reported consolidated financial statements as of December 31, 2015 and for the years ended December 31, 2015 and 2014. Liberty Property Trust Consolidated Balance Sheet (in thousands) December 31, 2015 As previously reported Adjustment As adjusted Other liabilities $ 243,806 $ (20,307 ) $ 223,499 Total liabilities 3,540,145 (20,307 ) 3,519,838 Accumulated other comprehensive loss (17,893 ) (4,613 ) (22,506 ) Distributions in excess of net income (698,954 ) 24,266 (674,688 ) Total Liberty Property Trust shareholders' equity 2,952,928 19,653 2,972,581 Noncontrolling interest - operating partnership 53,100 654 53,754 Total equity 3,009,947 20,307 3,030,254 Liberty Property Limited Partnership Consolidated Balance Sheet (in thousands) December 31, 2015 As previously reported Adjustment As adjusted Other liabilities $ 243,806 $ (20,307 ) $ 223,499 Total liabilities 3,540,145 (20,307 ) 3,519,838 General Partner's equity 2,952,928 19,653 2,972,581 Limited partners' equity 53,100 654 53,754 Total owners' equity 3,009,947 20,307 3,030,254 Liberty Property Trust Consolidated Statements of Comprehensive Income (in thousands except per share amounts) Year ended December 31, 2015 Year ended December 31, 2014 As previously reported Adjustment As adjusted As previously reported Adjustment As adjusted Interest and other income $ 22,863 $ 918 $ 23,781 $ 17,669 $ (69 ) $ 17,600 Total other income (expense) (112,916 ) 918 (111,998 ) (134,218 ) (69 ) (134,287 ) Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures 144,216 918 145,134 123,088 (69 ) 123,019 Income taxes (3,233 ) 560 (2,673 ) (2,967 ) 377 (2,590 ) Income from continuing operations 244,446 1,478 245,924 175,582 308 175,890 Net income 244,446 1,478 245,924 224,163 308 224,471 Noncontrolling interest - operating partnership (6,158 ) (34 ) (6,192 ) (5,706 ) (7 ) (5,713 ) Income available to common shareholders 238,039 1,444 239,483 217,910 301 218,211 Other comprehensive loss - foreign currency translation (11,433 ) (1,107 ) (12,540 ) (14,415 ) (1,256 ) (15,671 ) Other comprehensive loss (11,921 ) (1,107 ) (13,028 ) (16,376 ) (1,256 ) (17,632 ) Total comprehensive income 232,525 371 232,896 207,787 (948 ) 206,839 Less: comprehensive income attributable to noncontrolling interest (6,127 ) (8 ) (6,135 ) (5,870 ) (8 ) (5,878 ) Comprehensive income attributable to common shareholders $ 226,398 $ 363 $ 226,761 $ 201,917 $ (956 ) $ 200,961 Income from continuing operations per common share - basic $ 1.61 $ 0.01 $ 1.62 $ 1.16 $ — $ 1.16 Income per common share - basic $ 1.61 $ 0.01 $ 1.62 $ 1.48 $ — $ 1.48 Income per common share - diluted $ 1.60 $ 0.01 $ 1.61 $ 1.15 $ 0.01 $ 1.16 Income per common share - diluted $ 1.60 $ 0.01 $ 1.61 $ 1.47 $ 0.01 $ 1.48 Liberty Property Limited Partnership Consolidated Statements of Comprehensive Income (in thousands except per share amounts) Year ended December 31, 2015 Year ended December 31, 2014 As previously reported Adjustment As adjusted As previously reported Adjustment As adjusted Interest and other income $ 22,863 $ 918 $ 23,781 $ 17,669 $ (69 ) $ 17,600 Total other income (expense) (112,916 ) 918 (111,998 ) (134,218 ) (69 ) (134,287 ) Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures 144,216 918 145,134 123,088 (69 ) 123,019 Income taxes (3,233 ) 560 (2,673 ) (2,967 ) 377 (2,590 ) Income from continuing operations 244,446 1,478 245,924 175,582 308 175,890 Net income 244,446 1,478 245,924 224,163 308 224,471 Income available to common unitholders 243,725 1,478 245,203 223,144 308 223,452 Other comprehensive loss - foreign currency translation (11,433 ) (1,107 ) (12,540 ) (14,415 ) (1,256 ) (15,671 ) Other comprehensive loss (11,921 ) (1,107 ) (13,028 ) (16,376 ) (1,256 ) (17,632 ) Total comprehensive income 232,525 371 232,896 207,787 (948 ) 206,839 Income from continuing operations per common unit - basic $ 1.61 $ 0.01 $ 1.62 $ 1.16 $ — $ 1.16 Income per common unit - basic $ 1.61 $ 0.01 $ 1.62 $ 1.48 $ — $ 1.48 Income per common unit - diluted $ 1.60 $ 0.01 $ 1.61 $ 1.15 $ 0.01 $ 1.16 Income per common share - diluted $ 1.60 $ 0.01 $ 1.61 $ 1.47 $ 0.01 $ 1.48 Net income allocated to general partners $ 238,039 $ 1,444 $ 239,483 $ 217,910 $ 301 $ 218,211 Net income allocated to limited partners $ 6,158 $ 34 $ 6,192 $ 5,706 $ 7 $ 5,713 Liberty Property Trust Consolidated Statements of Cash Flows (in thousands) Year ended December 31, 2015 Year ended December 31, 2014 As previously reported Adjustment As adjusted As previously reported Adjustment As adjusted Net income $ 244,446 $ 1,478 $ 245,924 $ 224,163 $ 308 $ 224,471 Changes in operating assets and liabilities: Other liabilities 9,296 (1,478 ) 7,818 (20,040 ) (308 ) (20,348 ) Liberty Property Limited Partnership Consolidated Statements of Cash Flows (in thousands) Year ended December 31, 2015 Year ended December 31, 2014 As previously reported Adjustment As adjusted As previously reported Adjustment As adjusted Net income $ 244,446 $ 1,478 $ 245,924 $ 224,163 $ 308 $ 224,471 Changes in operating assets and liabilities: Other liabilities 9,296 (1,478 ) 7,818 (20,040 ) (308 ) (20,348 ) The Company also made changes to the January 1, 2014 balances in the Consolidated Statements of Equity as follows: Liberty Property Trust Consolidated Statements of Equity (in thousands) January 1, 2014 As previously reported Adjustment As adjusted Accumulated other comprehensive income (loss) $ 9,742 $ (2,305 ) $ 7,437 Distributions in excess of net income (591,713 ) 22,520 (569,193 ) Total Liberty Property Trust shareholders' equity 3,035,844 20,215 3,056,059 Noncontrolling interest - operating partnership - common 56,713 668 57,381 Total equity 3,096,179 20,883 3,117,062 Liberty Property Limited Partnership Consolidated Statements of Equity (in thousands) January 1, 2014 As previously reported Adjustment As adjusted General partner's equity $ 3,035,844 $ 20,215 $ 3,056,059 Limited partners' equity 56,713 668 57,381 Total owners' equity 3,096,179 20,883 3,117,062 Previously, development service fee income relating to its unconsolidated joint ventures had been classified as other income and development service fee expense had been classified as general and administrative expense in amounts as follows: Nine months ended Year ended December 31, September 30, 2016 (unaudited) 2015 2014 Other income $ 3,789 $ 6,159 $ 2,456 General and administrative expense $ 3,210 $ 3,730 $ 1,608

Income per Common Share of th33

Income per Common Share of the Trust (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts): 2016 2015 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income (Numerator) Weighted Average Shares (Denominator) Per Share Net income available to common shareholders - basic $ 356,817 146,204 $ 2.44 $ 239,483 148,243 $ 1.62 Dilutive shares for long-term compensation plans — 685 — 600 Net income available to common shareholders - diluted $ 356,817 146,889 $ 2.43 $ 239,483 148,843 $ 1.61 2014 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income from continuing operations net of noncontrolling interest - basic $ 170,772 147,216 $ 1.16 Dilutive shares for long-term compensation plans — 670 Income from continuing operations net of noncontrolling interest - diluted $ 170,772 147,886 $ 1.16 Discontinued operations net of noncontrolling interest - basic $ 47,439 147,216 $ 0.32 Dilutive shares for long-term compensation plans — 670 Discontinued operations net of noncontrolling interest - diluted $ 47,439 147,886 $ 0.32 Net income available to common shareholders - basic $ 218,211 147,216 $ 1.48 Dilutive shares for long-term compensation plans — 670 Net income available to common shareholders - diluted $ 218,211 147,886 $ 1.48

Income per Common Unit of the34

Income per Common Unit of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Unit, Basic and Diluted [Line Items]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts): 2016 2015 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income (Numerator) Weighted Average Shares (Denominator) Per Share Net income available to common shareholders - basic $ 356,817 146,204 $ 2.44 $ 239,483 148,243 $ 1.62 Dilutive shares for long-term compensation plans — 685 — 600 Net income available to common shareholders - diluted $ 356,817 146,889 $ 2.43 $ 239,483 148,843 $ 1.61 2014 Income (Numerator) Weighted Average Shares (Denominator) Per Share Income from continuing operations net of noncontrolling interest - basic $ 170,772 147,216 $ 1.16 Dilutive shares for long-term compensation plans — 670 Income from continuing operations net of noncontrolling interest - diluted $ 170,772 147,886 $ 1.16 Discontinued operations net of noncontrolling interest - basic $ 47,439 147,216 $ 0.32 Dilutive shares for long-term compensation plans — 670 Discontinued operations net of noncontrolling interest - diluted $ 47,439 147,886 $ 0.32 Net income available to common shareholders - basic $ 218,211 147,216 $ 1.48 Dilutive shares for long-term compensation plans — 670 Net income available to common shareholders - diluted $ 218,211 147,886 $ 1.48
Liberty Property Limited Partnership [Member]
Earnings Per Unit, Basic and Diluted [Line Items]
Schedule of Earnings Per Share, Basic and Diluted	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): 2016 2015 Income (Numerator) Weighted Average Units (Denominator) Per Unit Income (Numerator) Weighted Average Units (Denominator) Per Unit Income - net of noncontrolling interest - consolidated joint ventures $ 365,887 $ 245,675 Less: Preferred unit distributions (472 ) (472 ) Income available to common unitholders - basic $ 365,415 149,740 $ 2.44 $ 245,203 151,783 $ 1.62 Dilutive units for long-term compensation plans — 685 — 600 Income available to common unitholders - diluted $ 365,415 150,425 $ 2.43 $ 245,203 152,383 $ 1.61 2014 Income (Numerator) Weighted Average Units (Denominator) Per Unit Income from continuing operations net of noncontrolling interest - consolidated joint ventures $ 175,343 Less: Preferred unit distributions (472 ) Income from continuing operations available to common unitholders - basic $ 174,871 150,770 $ 1.16 Dilutive units for long-term compensation plans — 670 Income from continuing operations available to common unitholders - diluted $ 174,871 151,440 $ 1.16 Income from discontinued operations - basic $ 48,581 150,770 $ 0.32 Dilutive units for long-term compensation plans — 670 Income from discontinued operations - diluted $ 48,581 151,440 $ 0.32 Income available to common unitholders - basic $ 223,452 150,770 $ 1.48 Dilutive units for long-term compensation plans — 670 Income available to common unitholders - diluted $ 223,452 151,440 $ 1.48

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following table sets forth the components of Accumulated Other Comprehensive Loss (in thousands): December 31, 2016 2015 Foreign Currency Translation: Beginning balance $ (22,023 ) $ (9,483 ) Translation adjustment (34,744 ) (12,540 ) Ending balance (56,767 ) (22,023 ) Derivative Instruments: Beginning balance (865 ) (377 ) Unrealized loss (659 ) (1,884 ) Reclassification adjustment (1) 1,069 1,396 Ending balance (455 ) (865 ) Total accumulated other comprehensive loss (57,222 ) (22,888 ) Less: portion included in noncontrolling interest – operating partnership 1,191 382 Total accumulated other comprehensive loss included in shareholders' equity $ (56,031 ) $ (22,506 ) (1) Amounts reclassified out of Accumulated Other Comprehensive Loss/General & Limited Partner's Equity into contractual interest expense.

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2016
Real Estate [Abstract]
Schedule of Carrying Value of Properties	The carrying value of these properties by type as of December 31, 2016 and 2015 is as follows (in thousands): Land Building and Land and Accumulated Improvements Improvements Total Depreciation 2016 Industrial properties $ 919,951 $ 3,757,063 $ 4,677,014 $ 734,595 Office properties 174,519 744,858 919,377 205,520 2016 Total $ 1,094,470 $ 4,501,921 $ 5,596,391 $ 940,115 2015 Industrial properties $ 824,140 $ 3,637,484 $ 4,461,624 $ 698,456 Office properties 360,787 1,494,164 1,854,951 450,472 2015 Total $ 1,184,927 $ 5,131,648 $ 6,316,575 $ 1,148,928
Schedule of Operating Properties	Information on the operating properties the Company sold during the years ended December 31, 2016 and 2015 is as follows: 2016 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Chicago/Milwaukee 1 5 171,114 $ 10,625 Florida 51 12 3,509,641 505,828 Lehigh/Central PA 1 — 120,777 11,200 Minnesota 23 — 1,866,161 189,200 Philadelphia — 1 — 2,640 Southeastern PA 31 — 2,165,002 266,821 Other 18 18 1,631,295 224,241 Total 125 36 9,463,990 $ 1,210,555 2015 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Carolinas/Richmond 22 3 1,319,299 $ 110,054 Florida 4 — 874,125 55,425 Minnesota 2 — 222,642 25,700 Southeastern PA 46 20 2,724,489 316,583 Other 7 — 569,618 37,371 Total 81 23 5,710,173 $ 545,133 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 Revenues $ 4,728 Operating expenses (2,258 ) Interest and other income 37 Interest expense (557 ) Depreciation and amortization — Income before gain on property dispositions 1,950 Gain on property dispositions 46,631 Net income $ 48,581
Schedule of Operating Properties and Land Parcels Acquired	Information on the operating properties and land parcels the Company acquired during the years ended December 31, 2016 and 2015 is as follows: 2016 Acquisitions Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Purchase Price (in thousands) Carolinas/Richmond — 13 — $ 2,251 Chicago/Milwaukee 1 6 73,160 11,064 Lehigh/Central PA — 76 — 15,395 Philadelphia — 6 — 13,943 Southeastern PA — 8 — 3,344 Other — 108 — 14,895 Total 1 217 73,160 $ 60,892 2015 Acquisitions Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Purchase Price (in thousands) Carolinas/Richmond — 94 — $ 1,727 Houston 3 139 921,196 86,497 Lehigh/Central PA — 281 — 62,402 Minnesota 1 188 197,956 24,541 Other 1 56 410,059 45,248 Total 5 758 1,529,211 $ 220,415

Investments in Unconsolidated37

Investments in Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Condensed Balance Sheet of Equity Method Investments	The condensed balance sheets as of December 31, 2016 and 2015 and condensed statements of operations for the years ended December 31, 2016 , 2015 and 2014 for Liberty Venture I LP, Kings Hill Unit Trust, Liberty Illinois, LP, Liberty Washington LP, Liberty/Comcast, Liberty Property 18th & Arch, and the other unconsolidated joint ventures are as follows (in thousands): Condensed Balance Sheets: December 31, 2016 Liberty Kings Hill Liberty Liberty Liberty/ Liberty Property Venture I, LP Unit Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other Total Real estate assets $ 226,313 $ 137,960 $ 251,765 $ 289,627 $ 495,842 $ — $ 71,722 $ 1,473,229 Accumulated depreciation (42,779 ) (26,872 ) (51,901 ) (44,235 ) (125,014 ) — (9,702 ) (300,503 ) Real estate assets, net 183,534 111,088 199,864 245,392 370,828 — 62,020 1,172,726 Development in progress 6,886 — — — — 671,032 — 677,918 Land held for development — — 31,567 — — — 42,259 73,826 Other assets 23,494 9,603 19,036 18,749 48,074 52,053 29,654 200,663 Total assets $ 213,914 $ 120,691 $ 250,467 $ 264,141 $ 418,902 $ 723,085 $ 133,933 $ 2,125,133 Debt $ 154,386 $ 83,846 $ 137,294 $ 103,667 $ 309,475 $ — $ 57,660 $ 846,328 Other liabilities 6,673 24,513 8,433 4,385 9,964 95,574 17,155 166,697 Equity 52,855 12,332 104,740 156,089 99,463 627,511 59,118 1,112,108 Total liabilities and equity $ 213,914 $ 120,691 $ 250,467 $ 264,141 $ 418,902 $ 723,085 $ 133,933 $ 2,125,133 Company's net investment in unconsolidated joint ventures (1) $ 11,175 $ 5,349 $ 15,339 $ 38,863 $ 18,688 $ 132,952 $ 22,712 $ 245,078 December 31, 2015 Liberty Kings Hill Liberty Liberty Liberty/ Liberty Property Venture I, LP Unit Trust Illinois, LP Washington, LP Comcast 18th and Arch (2) Other Total Real estate assets $ 168,690 $ 164,603 $ 263,552 $ 534,132 $ 495,248 $ — $ 67,940 $ 1,694,165 Accumulated depreciation (37,473 ) (28,513 ) (54,308 ) (43,224 ) (111,067 ) — (10,950 ) (285,535 ) Real estate assets, net 131,217 136,090 209,244 490,908 384,181 — 56,990 1,408,630 Development in progress 34,878 — 22,998 — — 323,615 17,401 398,892 Land held for development 4,471 — 28,590 2,000 — — 42,495 77,556 Other assets 14,860 8,967 20,668 52,429 47,441 15,594 49,312 209,271 Total assets $ 185,426 $ 145,057 $ 281,500 $ 545,337 $ 431,622 $ 339,209 $ 166,198 $ 2,094,349 Debt $ 121,793 $ 99,603 $ 155,601 $ 314,080 $ 313,402 $ — $ 56,739 $ 1,061,218 Other liabilities 10,571 27,408 8,594 10,634 9,618 40,958 29,064 136,847 Equity 53,062 18,046 117,305 220,623 108,602 298,251 80,395 896,284 Total liabilities and equity $ 185,426 $ 145,057 $ 281,500 $ 545,337 $ 431,622 $ 339,209 $ 166,198 $ 2,094,349 Company's net investment in unconsolidated joint ventures (1) $ 11,563 $ 6,789 $ 18,221 $ 55,552 $ 20,465 $ 62,677 $ 43,187 $ 218,454
Schedule of Condensed Statements of Operations of Equity Method Investments	Condensed Statements of Operations: Year Ended December 31, 2016 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust (4) Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) Total Total revenue $ 25,149 $ 11,926 $ 26,599 $ 39,727 $ 65,587 $ — $ 9,888 $ 178,876 Operating expense 6,835 4,854 9,961 15,935 26,761 280 2,801 67,427 18,314 7,072 16,638 23,792 38,826 (280 ) 7,087 111,449 Interest (4,182 ) (2,554 ) (7,243 ) (10,866 ) (19,737 ) — (2,462 ) (47,044 ) Depreciation and amortization (6,375 ) (3,557 ) (7,589 ) (10,750 ) (14,513 ) — (1,925 ) (44,709 ) Other income (expense) 50 (77 ) 64 257 (213 ) 1,270 7,123 8,474 Gain (loss) on sale/impairment — — 4,068 40,943 — — (11 ) 45,000 Net income (loss) $ 7,807 $ 884 $ 5,938 $ 43,376 $ 4,363 $ 990 $ 9,812 $ 73,170 Company's equity in earnings (loss) of unconsolidated joint ventures $ 2,332 $ 275 $ 2,065 $ 10,857 $ 1,594 $ 213 $ 4,634 $ 21,970 Year Ended December 31, 2015 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) Total Total revenue $ 23,708 $ 12,602 $ 26,085 $ 71,101 $ 68,444 $ — $ 9,387 $ 211,327 Operating expense 7,977 5,261 9,303 27,384 29,692 221 2,727 82,565 15,731 7,341 16,782 43,717 38,752 (221 ) 6,660 128,762 Interest (5,415 ) (6,116 ) (8,441 ) (17,353 ) (19,936 ) — (2,248 ) (59,509 ) Depreciation and amortization (6,399 ) (3,954 ) (7,406 ) (20,725 ) (14,442 ) — (1,840 ) (54,766 ) Other income (expense) 68 45,604 29 531 (227 ) 30 9,925 55,960 Gain (loss) on sale/impairment 760 — — (56,792 ) — — — (56,032 ) Net income (loss) $ 4,745 $ 42,875 $ 964 $ (50,622 ) $ 4,147 $ (191 ) $ 12,497 $ 14,415 Company's equity in earnings (loss) of unconsolidated joint ventures $ 1,540 $ (425 ) $ 807 $ (7,314 ) $ 2,053 $ (29 ) $ 6,517 $ 3,149 Year Ended December 31, 2014 Liberty Kings Hill Unit Liberty Liberty Liberty/ Liberty Property Venture I, LP Trust Illinois, LP Washington, LP Comcast 18th & Arch (2) Other (3) 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 Loss from discontinued operations — — 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 (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 reducing the Company's investments in unconsolidated joint ventures by $1.4 million and $4.5 million as of December 31, 2016 and 2015 , respectively. 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) Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia. (3) Other income/(expense) for this group of joint ventures reflects gains related to the sales of land leasehold interests totaling $7.1 million , $9.9 million and $9.1 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Deferred Financing and Leasin38

Deferred Financing and Leasing Costs (Tables)	12 Months Ended
	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Schedule of Deferred Financing and Leasing Costs	Deferred financing and leasing costs were comprised of the following as of December 31, 2016 and 2015 (in thousands): December 31, 2016 2015 Deferred financing costs $ 11,917 $ 11,917 Deferred leasing costs 190,849 229,798 Market value intangible 19,451 20,178 Origination value intangible 83,485 106,014 305,702 367,907 Accumulated amortization: Deferred financing costs 10,152 8,713 Deferred leasing costs 76,174 97,840 Market value intangible 12,626 10,358 Origination value intangible 53,357 58,887 152,309 175,798 Deferred financing and leasing costs, net $ 153,393 $ 192,109
Leases, Acquired-in-Place, Market Adjustment [Member]
Finite-Lived Intangible Assets [Line Items]
Schedule of Future Amortization Expense	The aggregate amortization of net market value intangible assets and liabilities is a decrease (increase) in rental revenue over the next five years and thereafter as follows (in thousands): 2017 $ 1,446 2018 1,425 2019 900 2020 5 2021 (142 ) Thereafter (1,181 ) Total $ 2,453
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Schedule of Future Amortization Expense	The aggregate amortization expense for origination value intangible asset for the next five years and thereafter is as follows (in thousands): 2017 $ 10,985 2018 7,310 2019 4,316 2020 2,164 2021 1,450 Thereafter 3,903 Total $ 30,128

Indebtedness (Tables)

Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of Debt	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, 2016 are as follows (in thousands, except percentages): Weighted Mortgages Average Principal Principal Unsecured Credit Interest Amortization Maturities Notes Facility Total Rate 2017 $ 7,896 $ — $ — $ — $ 7,896 4.94 % 2018 6,470 27,102 — — 33,572 4.96 % 2019 6,666 50,043 — — 56,709 4.03 % 2020 3,351 67,370 350,000 — 420,721 4.93 % 2021 2,326 65,091 — — 67,417 4.06 % 2022 2,172 — 400,000 — 402,172 4.13 % 2023 2,281 — 300,000 — 302,281 3.39 % 2024 2,385 — 450,000 — 452,385 4.40 % 2025 2,513 — 400,000 — 402,513 3.76 % 2026 and thereafter 22,294 1,946 400,000 — 424,240 3.34 % Subtotal $ 58,354 $ 211,552 $ 2,300,000 $ — $ 2,569,906 4.04 % Reconciling items (1) 6,744 — (19,714 ) — (12,970 ) Total for consolidated balance sheet $ 65,098 $ 211,552 $ 2,280,286 $ — $ 2,556,936 (1) Includes deferred financing costs, premium/discount and market adjustments.

Leasing Activity (Tables)

Leasing Activity (Tables)	12 Months Ended
	Dec. 31, 2016
Operating Leases, Future Minimum Payments Receivable [Abstract]
Schedule of Future Minimum Rental Payments	Future minimum rental payments due from tenants under noncancelable operating leases as of December 31, 2016 are as follows (in thousands): 2017 $ 441,839 2018 403,254 2019 353,110 2020 287,720 2021 236,993 Thereafter 891,413 Total $ 2,614,329

Noncontrolling Interest - Ope41

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Tables)	12 Months Ended
	Dec. 31, 2016
Noncontrolling Interest - Operating Partnership / LImited Partners' Equity - Preferred Units [Abstract]
Schedule of Preferred Units	As of December 31, 2016 , the Company had outstanding the following cumulative preferred units of the Operating Partnership: ISSUE AMOUNT UNITS LIQUIDATION PREFERENCE DIVIDEND RATE (in 000’s) Series I-2 $ 7,537 301 $25 6.25 %

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Shareholders' Equity [Abstract]
Schedule of Taxability of Common Shares	The following unaudited table summarizes the taxability of common share distributions (taxability for 2016 is estimated): 2016 2015 2014 Ordinary dividend $ 1.0319 $ 1.4348 $ 1.2556 Qualified dividend 0.0013 — — Capital gain - 20% — 0.1112 — IRC Sec 1250 unrecaptured gain - 25% 0.6176 0.3372 0.3712 Return of capital 0.2492 0.0168 0.2732 Total $ 1.9000 $ 1.9000 $ 1.9000

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation [Abstract]
Schedule of Valuation Assumptions	The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated: Year Ended December 31, 2015 2014 Risk-free interest rate 1.8% 1.6% Dividend yield 5.2% 5.2% Historical volatility factor 0.24 0.236 Weighted-average expected life 7 years 6 years
Schedule of Stock Options Activity	A summary of the Company's share option activity and related information for the year ended December 31, 2016 follows: Options (000s) Weighted Average Exercise Price Outstanding January 1, 2016 2,609 $ 36.08 Exercised (451 ) 31.90 Forfeited (231 ) 44.42 Outstanding December 31, 2016 1,927 $ 36.02 Exercisable at December 31, 2016 1,436 $ 35.99
Schedule of Key Assumptions Used in the Monte Carlo Simulation	The key assumptions used in the Monte Carlo simulations are as follows: Year Ended December 31, 2016 2015 2014 Risk-free interest rate 1.01% 0.99% 0.68% Volatility 19% 17% 24%
Schedule of Nonvested Share Activity	The Company's restricted LTI share activity for the year ended December 31, 2016 is as follows: Shares (000s) Weighted Avg. Grant Date Fair value Nonvested at January 1, 2016 723 $ 36.75 Granted 388 32.48 Vested (242 ) 37.07 Forfeited (57 ) 35.39 Nonvested at December 31, 2016 812 $ 34.71

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , were as follows (in thousands): Year Amount 2017 $ 1,339 2018 1,595 2019 1,595 2020 1,595 2021 1,595 2022 though 2067 34,379 Total $ 42,098

Quarterly Results of Operatio45

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	A summary of quarterly results of operations for the years ended December 31, 2016 and 2015 follows (in thousands, except for per share data): QUARTER ENDED DEC. 31, SEPT. 30, JUNE 30, MAR. 31, DEC. 31, SEPT. 30, JUNE 30, MAR. 31, 2016 (2) 2016 2016 2016 2015 (2) 2015 2015 2015 Operating revenue $ 179,057 $ 190,857 $ 186,654 $ 190,140 $ 199,382 $ 198,972 $ 203,518 $ 206,901 Net income 200,291 55,734 51,057 59,063 83,841 93,695 36,526 31,862 Income per common share - basic (1) 1.33 0.37 0.34 0.39 0.56 0.61 0.24 0.21 Income per common share - diluted (1) 1.33 0.37 0.34 0.39 0.55 0.61 0.24 0.21 (1) The sum of quarterly financial data may vary from the annual data due to rounding. (2) Amounts include adjustment of previously reported financial information as discussed in Note 2.

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	The operating information by reportable segment is as follows (in thousands): Year ended December 31, 2016 2015 2014 Operating revenue Carolinas/Richmond $ 66,270 $ 71,950 $ 76,781 Chicago/Milwaukee 42,836 37,431 33,068 Florida 99,733 127,184 135,203 Houston 59,582 54,031 49,309 Lehigh/Central PA 141,046 133,473 118,145 Minnesota 41,192 47,932 54,892 Philadelphia 41,838 40,490 35,238 Southeastern PA 91,656 147,712 148,714 United Kingdom 13,376 15,135 16,360 Other 136,521 133,345 130,013 Segment-level operating revenue 734,050 808,683 797,723 Reconciliation to total operating revenues Development service fee income (1) 12,941 — — Discontinued operations — — (4,728 ) Other (283 ) 90 (364 ) Total operating revenue $ 746,708 $ 808,773 $ 792,631 Net operating income Carolinas/Richmond $ 46,170 $ 47,849 $ 48,935 Chicago/Milwaukee 28,199 24,851 20,856 Florida 62,177 77,283 83,195 Houston 32,499 31,159 29,134 Lehigh/Central PA 102,209 94,972 82,050 Minnesota 17,059 20,112 26,464 Philadelphia 30,862 29,679 26,722 Southeastern PA 53,947 80,458 81,183 United Kingdom 6,390 10,486 10,704 Other 89,274 87,925 83,991 Segment-level net operating income 468,786 504,774 493,234 Reconciliation to income from continuing operations Interest expense (2) (115,077 ) (135,779 ) (152,444 ) Loss on debt extinguishment (27,099 ) — — Depreciation/amortization expense (2) (3) (152,556 ) (166,500 ) (177,715 ) Impairment - real estate assets (3,879 ) (18,244 ) (117 ) Gain on property dispositions 219,270 100,314 45,147 Equity in earnings of unconsolidated joint ventures 21,970 3,149 10,314 General and administrative expense (2) (3) (45,357 ) (44,529 ) (38,041 ) Discontinued operations excluding gain on property dispositions — — (1,950 ) Income taxes (3) 47 (2,351 ) (2,404 ) Other 40 5,090 (134 ) Income from continuing operations $ 366,145 $ 245,924 $ 175,890 (1) Prior to the fourth quarter of 2016, development service fee income had been classified as other income and development service fee expense had been classified as general and administrative expense. See Note 2. (2) Includes activity on discontinued operations. (3) Excludes costs which are included in determining segment-level net operating income.
Schedule of Depreciation and Amortization	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 (in thousands): Year ended December 31, 2016 2015 2014 Carolinas/Richmond $ 4,944 $ 5,307 $ 6,607 Chicago/Milwaukee 2,026 1,161 466 Florida 6,605 9,407 9,324 Houston 4,713 4,466 3,988 Lehigh/Central PA 12,262 11,641 10,157 Minnesota 3,832 4,986 4,478 Philadelphia 2,706 2,220 1,803 Southeastern PA 6,134 12,346 12,272 United Kingdom 259 292 177 Other 9,792 8,249 5,631 Depreciation and amortization of tenant improvement and lease transaction costs $ 53,273 $ 60,075 $ 54,903
Revenue from External Customers by Products and Services	The Company's operating revenue by product type and by reportable segment for the years ended December 31, 2016 , 2015 and 2014 is as follows (in thousands): Year Ended December 31, 2016 December 31, 2015 December 31, 2014 Industrial Office Total Industrial Office Total Industrial Office Total Carolinas/Richmond $ 66,270 $ — $ 66,270 $ 62,075 $ 9,875 $ 71,950 $ 56,794 $ 19,987 $ 76,781 Chicago/Milwaukee 42,836 — 42,836 37,431 — 37,431 33,068 — 33,068 Florida 66,028 33,705 99,733 67,149 60,035 127,184 62,689 72,514 135,203 Houston 58,370 1,212 59,582 53,802 229 54,031 49,309 — 49,309 Lehigh/Central PA 138,766 2,280 141,046 131,168 2,305 133,473 115,821 2,324 118,145 Minnesota 22,171 19,021 41,192 24,721 23,211 47,932 25,378 29,514 54,892 Philadelphia 12,842 28,996 41,838 11,809 28,681 40,490 10,072 25,166 35,238 Southeastern PA 19,448 72,208 91,656 28,457 119,255 147,712 28,895 119,819 148,714 United Kingdom 10,775 2,601 13,376 12,104 3,031 15,135 13,090 3,270 16,360 Other (1) 91,762 44,759 136,521 86,180 47,165 133,345 82,672 47,341 130,013 $ 529,268 $ 204,782 734,050 $ 514,896 $ 293,787 808,683 $ 477,788 $ 319,935 797,723 Reconciliation to total operating revenue Development service fee income 12,941 — — Discontinued operations — — (4,728 ) Corporate other (283 ) 90 (364 ) Total operating revenue $ 746,708 $ 808,773 $ 792,631
Reconciliation of Assets from Segment to Consolidated	The Company's total assets by reportable segment as of December 31, 2016 and 2015 is as follows (in thousands): As of December 31, 2016 2015 Carolinas/Richmond $ 503,920 $ 467,098 Chicago/Milwaukee 423,889 429,390 Florida 514,431 874,352 Houston 530,438 522,285 Lehigh/Central PA 1,311,815 1,157,468 Minnesota 192,409 346,840 Philadelphia 557,510 444,889 Southeastern PA 262,155 448,523 United Kingdom 189,766 215,850 Other 1,403,431 1,586,481 Segment-level total assets 5,889,764 6,493,176 Corporate Other 103,049 64,453 Total assets $ 5,992,813 $ 6,557,629
Schedule of Long-Lived Assets, by Geographical Areas	The Company's real estate assets by reportable segment as of December 31, 2016 and 2015 is as follows (in thousands): As of December 31, 2016 2015 Carolinas/Richmond $ 482,736 $ 446,348 Chicago/Milwaukee 382,325 387,182 Florida 476,046 815,712 Houston 495,817 483,432 Lehigh/Central PA 1,234,090 1,096,195 Minnesota 182,737 322,627 Philadelphia 332,933 282,159 Southeastern PA 236,317 410,195 United Kingdom 149,082 174,390 Other 1,288,212 1,447,322 Total real estate assets $ 5,260,295 $ 5,865,562
Schedule of Expenditures on Long-Lived Assets	The Company incurred the following costs related to its long-lived assets for the years ended December 31, 2016 , 2015 and 2014 (in thousands): Year Ended December 31, 2016 2015 2014 Costs incurred on long-lived assets Carolinas/Richmond $ 51,647 $ 31,175 $ 82,600 Chicago/Milwaukee 18,294 13,483 21,698 Florida 38,312 43,594 45,152 Houston 25,638 96,681 70,903 Lehigh/Central PA 176,386 165,319 105,725 Minnesota 11,023 41,259 28,966 Philadelphia 57,691 34,122 32,012 Southeastern PA 13,110 9,047 39,638 United Kingdom 11,492 12,960 16,298 Other 107,500 125,412 172,495 Total costs incurred on long-lived assets $ 511,093 $ 573,052 $ 615,487

Accounting for the Impairment47

Accounting for the Impairment or Disposal of Long-Lived Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting for the Impairment or Disposal of Long-Lived Assets [Abstract]
Schedule of Operating Properties	Information on the operating properties the Company sold during the years ended December 31, 2016 and 2015 is as follows: 2016 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Chicago/Milwaukee 1 5 171,114 $ 10,625 Florida 51 12 3,509,641 505,828 Lehigh/Central PA 1 — 120,777 11,200 Minnesota 23 — 1,866,161 189,200 Philadelphia — 1 — 2,640 Southeastern PA 31 — 2,165,002 266,821 Other 18 18 1,631,295 224,241 Total 125 36 9,463,990 $ 1,210,555 2015 Sales Reportable Segment Number of Buildings Acres of Developable Land (unaudited) Leaseable Square Feet (unaudited) Gross Proceeds (in thousands) Carolinas/Richmond 22 3 1,319,299 $ 110,054 Florida 4 — 874,125 55,425 Minnesota 2 — 222,642 25,700 Southeastern PA 46 20 2,724,489 316,583 Other 7 — 569,618 37,371 Total 81 23 5,710,173 $ 545,133 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 Revenues $ 4,728 Operating expenses (2,258 ) Interest and other income 37 Interest expense (557 ) Depreciation and amortization — Income before gain on property dispositions 1,950 Gain on property dispositions 46,631 Net income $ 48,581
Significant Sale	A summary of net income (excluding gain on sale) related to this portfolio is as follows (in thousands): Year Ended December 31, 2016 2015 2014 Net income $ 48,609 $ 58,792 $ 51,898 Noncontrolling interest - operating partnership (1,142 ) (1,370 ) (1,220 ) Income available to common shareholders $ 47,467 $ 57,422 $ 50,678
Asset Impairment Charges	The impairment losses are for operating properties or land parcels and were in the reportable segments and for the amounts as indicated below (in thousands): Year Ended December 31, Reportable Segment 2016 2015 2014 Carolinas/Richmond $ — $ 13,755 $ — Minnesota 3,879 — — Southeastern PA — 2,328 106 Other — 2,161 11 Total $ 3,879 $ 18,244 $ 117

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss)	The following table presents the location in the financial statements of the gains or losses recognized related to the Company’s cash flow hedges for the year ended December 31, 2016 , 2015, and 2014 (in thousands): Year Ended December 31, 2016 December 31, 2015 December 31, 2014 Amount of loss related to the effective portion recognized in other comprehensive (loss) income $ (648 ) $ (1,884 ) $ (3,400 ) Amount of loss related to the effective portion reclassified to interest expense $ (1,069 ) $ (1,396 ) $ (1,500 ) Amount of loss related to the ineffective portion recognized in interest expense $ (48 ) $ (91 ) $ (82 )

Supplemental Disclosure to St49

Supplemental Disclosure to Statements of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 and 2014 (amounts in thousands): 2016 2015 2014 Write-off of fully depreciated/amortized property and deferred costs $ 41,406 $ 42,339 $ 38,131 Write-off of depreciated property and deferred costs due to sale/demolition 461,480 252,017 173,083 Write-off of costs related to early debt extinguishment 219 — — Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity — — (11,948 ) Changes in accrued development capital expenditures (11,368 ) 11,964 6,264 Unrealized gain (loss) on cash flow hedge 410 (488 ) (3,419 ) Capitalized equity-based compensation 1,221 876 1,045 Redemption of noncontrolling interests - common units 132 — —

Organization (Details)

Organization (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Ownership interest in operating partnership - Limited Partnership	97.70%
Liberty Comcast 1701 JFK Boulevard, LP [Member]
Variable Interest Entity [Line Items]
Ownership percentage	20.00%
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Investments [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 18.7	$ 20.5

Summary of Significant Accoun51

Summary of Significant Accounting Policies (Real Estate and Depreciation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Construction related payables	$ 37.1	$ 42.9
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful Life	40 years
Capital Improvements [Member[ | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Capital Improvements [Member[ | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Compensation costs, capitalized	$ 7.2	$ 5.5	$ 5.1

Summary of Significant Accoun52

Summary of Significant Accounting Policies (Investments in Unconsolidated Joint Ventures Valuation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment Losses, Investments [Abstract]
Impairment losses	$ 0	$ 0	$ 0

Summary of Significant Accoun53

Summary of Significant Accounting Policies (Accounts Receivable/Deferred Rent Receivable) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Allowance for doubtful accounts receivable	$ 7.3	$ 6.9
Provision for doubtful accounts	$ 0.6	$ 2	$ 1.7

Summary of Significant Accoun54

Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Development service fee expense		$ 12,165	$ 0	$ 0
Previously Reported [Member] | Other Income [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Development service fee income	$ 3,789		6,159	2,456
Previously Reported [Member] | General and Administrative Expense [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Development service fee expense	$ 3,210		$ 3,730	$ 1,608

Summary of Significant Accoun55

Summary of Significant Accounting Policies (Deferred Financing and Leasing Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Capitalized compensation, leasing costs	$ 3.8	$ 4.6	$ 3.9

Summary of Significant Accoun56

Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage loans, net	$ 276,650	$ 307,908
Unsecured notes, net	2,280,286	2,580,108
Secured Debt [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	286,684	306,334
Unsecured Debt [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 2,340,762	$ 2,616,395

Summary of Significant Accoun57

Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Percent distribution of REIT taxable income	100.00%
Income provision	$ 0
Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT	4 years
Uncertain tax positions	$ 0
Penalties and interest	0	$ 0	$ 0
Penalties and interest accrued	0	0
Federal income tax basis	6,500,000,000	$ 7,600,000,000
Taxable REIT Subsidiary [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	30,800,000
Valuation allowance	$ 30,800,000
Expiration dates	Jan. 1, 2018

Summary of Significant Accoun58

Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended			168 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to other income									$ (128,226)	$ (111,998)	$ (134,287)
Decrease to Income taxes									(1,971)	(2,673)	(2,590)
(Increase) decrease to net income	$ 200,291	$ 55,734	$ 51,057	$ 59,063	$ 83,841	$ 93,695	$ 36,526	$ 31,862	366,145	245,924	224,471
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to other income										(111,998)	(134,287)
Decrease to Income taxes										(2,673)	(2,590)
(Increase) decrease to net income										245,924	224,471
Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to other income										918	(69)	$ 12,700
Decrease to Income taxes										560	377	$ 3,900
(Increase) decrease to net income									$ (500)	$ 1,478	$ 308

Summary of Significant Accoun59

Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities	$ 206,124	$ 223,499
Total liabilities	2,922,353	3,519,838
Accumulated other comprehensive loss	(56,031)	(22,506)
Distributions in excess of net income	(596,635)	(674,688)
Total Liberty Property Trust shareholders' equity	3,003,391	2,972,581
Noncontrolling interest - operating partnership	54,631	53,754
Total equity	3,062,923	3,030,254	$ 3,106,312	$ 3,117,062	[1]
Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities	206,124	223,499
Total liabilities	2,922,353	3,519,838
Total equity	3,062,923	3,030,254	$ 3,106,312	3,117,062	[2]
General Partner's equity	3,003,391	2,972,581
Limited partners' equity	$ 54,631	53,754
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		223,499
Total liabilities		3,519,838
Accumulated other comprehensive loss		(22,506)		7,437
Distributions in excess of net income		(674,688)		(569,193)
Total Liberty Property Trust shareholders' equity		2,972,581		3,056,059
Noncontrolling interest - operating partnership		53,754		57,381
Total equity		3,030,254		3,117,062
Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		223,499
Total liabilities		3,519,838
Total equity		3,030,254		3,117,062
General Partner's equity		2,972,581		3,056,059
Limited partners' equity		53,754		57,381
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		243,806
Total liabilities		3,540,145
Accumulated other comprehensive loss		(17,893)		9,742
Distributions in excess of net income		(698,954)		(591,713)
Total Liberty Property Trust shareholders' equity		2,952,928		3,035,844
Noncontrolling interest - operating partnership		53,100		56,713
Total equity		3,009,947		3,096,179
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		243,806
Total liabilities		3,540,145
Total equity		3,009,947		3,096,179
General Partner's equity		2,952,928		3,035,844
Limited partners' equity		53,100		56,713
Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		(20,307)
Total liabilities		(20,307)
Accumulated other comprehensive loss		(4,613)		(2,305)
Distributions in excess of net income		24,266		22,520
Total Liberty Property Trust shareholders' equity		19,653		20,215
Noncontrolling interest - operating partnership		654		668
Total equity		20,307		20,883
Adjustment [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities		(20,307)
Total liabilities		(20,307)
Total equity		20,307		20,883
General Partner's equity		19,653		20,215
Limited partners' equity		$ 654		$ 668
[1]	The Company adjusted the January 1, 2014 balances of Accumulated Other Comprehensive (Loss) Income, Distributions in Excess of Net Income, and Noncontrolling Interest - Operating Partnership - Common from previous filings. See Note 2.
[2]	The Company adjusted the January 1, 2014 balances of General Partner's Equity and Limited Partners' Equity - Common Units from previous filings. See Note 2.

Summary of Significant Accoun60

Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Comprehensive Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended			168 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income									$ 13,950	$ 23,781	$ 17,600
Total other income (expense)									(128,226)	(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures									126,876	145,134	123,019
Income taxes									(1,971)	(2,673)	(2,590)
Income from continuing operations									366,145	245,924	175,890
Net income	$ 200,291	$ 55,734	$ 51,057	$ 59,063	$ 83,841	$ 93,695	$ 36,526	$ 31,862	366,145	245,924	224,471
Noncontrolling interest – operating partnership									(9,070)	(6,192)	(5,713)
Income available to common shareholders									356,817	239,483	218,211
Other comprehensive (loss) income - foreign currency translation									(34,744)	(12,540)	(15,671)
Other comprehensive loss									(34,334)	(13,028)	(17,632)
Total comprehensive income									331,811	232,896	206,839
Less: comprehensive income attributable to noncontrolling interest									(8,519)	(6,135)	(5,878)
Comprehensive income attributable to common shareholders									323,292	226,761	200,961
Income per common share - basic (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.56	$ 0.61	$ 0.24	$ 0.21
Income per common share - diluted (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.55	$ 0.61	$ 0.24	$ 0.21
Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income									13,950	23,781	17,600
Total other income (expense)									(128,226)	(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures									126,876	145,134	123,019
Income taxes									(1,971)	(2,673)	(2,590)
Income from continuing operations									366,145	245,924	175,890
Net income									366,145	245,924	224,471
Income available to common shareholders									365,415	245,203	223,452
Other comprehensive (loss) income - foreign currency translation									(34,744)	(12,540)	(15,671)
Other comprehensive loss									(34,334)	(13,028)	(17,632)
Total comprehensive income									331,811	232,896	206,839
Net income allocated to general partners									356,817	239,483	218,211
Net income allocated to limited partners									9,070	6,192	5,713
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										23,781	17,600
Total other income (expense)										(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										145,134	123,019
Income taxes										(2,673)	(2,590)
Income from continuing operations										245,924	175,890
Net income										245,924	224,471
Noncontrolling interest – operating partnership										(6,192)	(5,713)
Income available to common shareholders										239,483	218,211
Other comprehensive (loss) income - foreign currency translation										(12,540)	(15,671)
Other comprehensive loss										(13,028)	(17,632)
Total comprehensive income										232,896	206,839
Less: comprehensive income attributable to noncontrolling interest										(6,135)	(5,878)
Comprehensive income attributable to common shareholders										$ 226,761	$ 200,961
Income from continuing operations (USD per share/unit)										$ 1.62	$ 1.16
Income per common share - basic (USD per share/unit)										$ 1.62	$ 1.48
Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										$ 23,781	$ 17,600
Total other income (expense)										(111,998)	(134,287)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										145,134	123,019
Income taxes										(2,673)	(2,590)
Income from continuing operations										245,924	175,890
Net income										245,924	224,471
Income available to common shareholders										245,203	223,452
Other comprehensive (loss) income - foreign currency translation										(12,540)	(15,671)
Other comprehensive loss										(13,028)	(17,632)
Total comprehensive income										$ 232,896	$ 206,839
Income from continuing operations (USD per share/unit)										$ 1.62	$ 1.16
Income per common share - basic (USD per share/unit)										$ 1.62	$ 1.48
Net income allocated to general partners										$ 239,483	$ 218,211
Net income allocated to limited partners										6,192	5,713
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										22,863	17,669
Total other income (expense)										(112,916)	(134,218)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										144,216	123,088
Income taxes										(3,233)	(2,967)
Income from continuing operations										244,446	175,582
Net income										244,446	224,163
Noncontrolling interest – operating partnership										(6,158)	(5,706)
Income available to common shareholders										238,039	217,910
Other comprehensive (loss) income - foreign currency translation										(11,433)	(14,415)
Other comprehensive loss										(11,921)	(16,376)
Total comprehensive income										232,525	207,787
Less: comprehensive income attributable to noncontrolling interest										(6,127)	(5,870)
Comprehensive income attributable to common shareholders										$ 226,398	$ 201,917
Income from continuing operations (USD per share/unit)										$ 1.61	$ 1.16
Income per common share - basic (USD per share/unit)										$ 1.61	$ 1.48
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										$ 22,863	$ 17,669
Total other income (expense)										(112,916)	(134,218)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										144,216	123,088
Income taxes										(3,233)	(2,967)
Income from continuing operations										244,446	175,582
Net income										244,446	224,163
Income available to common shareholders										243,725	223,144
Other comprehensive (loss) income - foreign currency translation										(11,433)	(14,415)
Other comprehensive loss										(11,921)	(16,376)
Total comprehensive income										$ 232,525	$ 207,787
Income from continuing operations (USD per share/unit)										$ 1.61	$ 1.16
Income per common share - basic (USD per share/unit)										$ 1.61	$ 1.48
Net income allocated to general partners										$ 238,039	$ 217,910
Net income allocated to limited partners										6,158	5,706
Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										918	(69)
Total other income (expense)										918	(69)	$ 12,700
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										918	(69)
Income taxes										560	377	$ 3,900
Income from continuing operations										1,478	308
Net income									$ (500)	1,478	308
Noncontrolling interest – operating partnership										(34)	(7)
Income available to common shareholders										1,444	301
Other comprehensive (loss) income - foreign currency translation										(1,107)	(1,256)
Other comprehensive loss										(1,107)	(1,256)
Total comprehensive income										371	(948)
Less: comprehensive income attributable to noncontrolling interest										(8)	(8)
Comprehensive income attributable to common shareholders										$ 363	$ (956)
Income from continuing operations (USD per share/unit)										$ 0.01	$ 0
Income per common share - basic (USD per share/unit)										$ 0.01	$ 0
Adjustment [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest and other income										$ 918	$ (69)
Total other income (expense)										918	(69)
Income before gain on property dispositions, income taxes and equity in earnings of unconsolidated joint ventures										918	(69)
Income taxes										560	377
Income from continuing operations										1,478	308
Net income										1,478	308
Income available to common shareholders										1,478	308
Other comprehensive (loss) income - foreign currency translation										(1,107)	(1,256)
Other comprehensive loss										(1,107)	(1,256)
Total comprehensive income										$ 371	$ (948)
Income from continuing operations (USD per share/unit)										$ 0.01	$ 0
Income per common share - basic (USD per share/unit)										$ 0.01	$ 0
Net income allocated to general partners										$ 1,444	$ 301
Net income allocated to limited partners										$ 34	$ 7
Common Stock [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										$ 1.61	$ 1.16
Common Stock [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.61	1.48
Common Stock [Member] | Previously Reported [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.60	1.15
Common Stock [Member] | Previously Reported [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.60	1.47
Common Stock [Member] | Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										0.01	0.01
Common Stock [Member] | Adjustment [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										0.01	0.01
Common Units [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.61	1.48
Common Units [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.61	1.16
Common Units [Member] | Previously Reported [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.60	1.47
Common Units [Member] | Previously Reported [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										1.60	1.15
Common Units [Member] | Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										0.01	0.01
Common Units [Member] | Adjustment [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income per common share - diluted (USD per share/unit)										$ 0.01	$ 0.01

Summary of Significant Accoun61

Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 200,291	$ 55,734	$ 51,057	$ 59,063	$ 83,841	$ 93,695	$ 36,526	$ 31,862	$ 366,145	$ 245,924	$ 224,471
Other liabilities									(18,606)	7,818	(20,348)
Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income									366,145	245,924	224,471
Other liabilities									(18,606)	7,818	(20,348)
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										245,924	224,471
Other liabilities										7,818	(20,348)
Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										245,924	224,471
Other liabilities										7,818	(20,348)
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										244,446	224,163
Other liabilities										9,296	(20,040)
Previously Reported [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										244,446	224,163
Other liabilities										9,296	(20,040)
Adjustment [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income									$ (500)	1,478	308
Other liabilities										(1,478)	(308)
Adjustment [Member] | Restatement of Net Profit (Loss) [Member] | Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										1,478	308
Other liabilities										$ (1,478)	$ (308)

Summary of Significant Accoun62

Summary of Significant Accounting Policies (Adjustment of Previously Reported Financial Information, Equity) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss	$ (56,031)	$ (22,506)
Distributions in excess of net income	(596,635)	(674,688)
Total Liberty Property Trust shareholders' equity	3,003,391	2,972,581
Noncontrolling interest - operating partnership	54,631	53,754
Total equity	3,062,923	3,030,254	$ 3,106,312	$ 3,117,062	[1]
Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(22,506)		7,437
Distributions in excess of net income		(674,688)		(569,193)
Total Liberty Property Trust shareholders' equity		2,972,581		3,056,059
Noncontrolling interest - operating partnership		53,754		57,381
Total equity		3,030,254		3,117,062
Restatement of Net Profit (Loss) [Member] | Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(17,893)		9,742
Distributions in excess of net income		(698,954)		(591,713)
Total Liberty Property Trust shareholders' equity		2,952,928		3,035,844
Noncontrolling interest - operating partnership		53,100		56,713
Total equity		3,009,947		3,096,179
Restatement of Net Profit (Loss) [Member] | Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated other comprehensive loss		(4,613)		(2,305)
Distributions in excess of net income		24,266		22,520
Total Liberty Property Trust shareholders' equity		19,653		20,215
Noncontrolling interest - operating partnership		654		668
Total equity		20,307		20,883
Liberty Property Limited Partnership [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity	3,003,391	2,972,581
Limited partners' equity	54,631	53,754
Total equity	$ 3,062,923	3,030,254	$ 3,106,312	3,117,062	[2]
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		2,972,581		3,056,059
Limited partners' equity		53,754		57,381
Total equity		3,030,254		3,117,062
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member] | Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		2,952,928		3,035,844
Limited partners' equity		53,100		56,713
Total equity		3,009,947		3,096,179
Liberty Property Limited Partnership [Member] | Restatement of Net Profit (Loss) [Member] | Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General Partner's equity		19,653		20,215
Limited partners' equity		654		668
Total equity		$ 20,307		$ 20,883
[1]	The Company adjusted the January 1, 2014 balances of Accumulated Other Comprehensive (Loss) Income, Distributions in Excess of Net Income, and Noncontrolling Interest - Operating Partnership - Common from previous filings. See Note 2.
[2]	The Company adjusted the January 1, 2014 balances of General Partner's Equity and Limited Partners' Equity - Common Units from previous filings. See Note 2.

Income per Common Share of th63

Income per Common Share of the Trust (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income
Income from continuing operations net of noncontrolling interest									$ 356,817	$ 239,483	$ 170,772
Discontinued operations net of noncontrolling interest									0	0	47,439
Income available to common shareholders									$ 356,817	$ 239,483	$ 218,211
Weighted Average Shares
Income from continuing operations net of noncontrolling interest - basic (shares)									146,204	148,243	147,216
Dilutive shares/units for long-term compensation plans (shares)									685	600	670
Income from continuing operations net of noncontrolling interest - diluted (shares)									146,889	148,843	147,886
Per Share/Unit
Net income available to common shareholders - basic (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.56	$ 0.61	$ 0.24	$ 0.21
Per Share
Income per common share - diluted (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.55	$ 0.61	$ 0.24	$ 0.21
Common shares [Member]
Per Share/Unit
Income from continuing operations net of noncontrolling interest - basic (USD per share/unit)									$ 2.44	$ 1.62	$ 1.16
Discontinued operations net of noncontrolling interest - basic (USD per share/unit)									0	0	0.32
Net income available to common shareholders - basic (USD per share/unit)									2.44	1.62	1.48
Per Share
Income from continuing operations net of noncontrolling interest - diluted (USD per share/unit)									2.43	1.61	1.16
Discontinued operations net of noncontrolling interest - diluted (USD per share/unit)									0	0	0.32
Income per common share - diluted (USD per share/unit)									$ 2.43	$ 1.61	$ 1.48

Income per Common Share of th64

Income per Common Share of the Trust (Anti-Dilutive) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Option [Member]
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options that were excluded from the computation of diluted income per common share	755	1,500	850

Income per Common Share of th65

Income per Common Share of the Trust (Exercise of Options) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Option [Member] | Common shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of option exercises in period	369,000	65,000	44,000

Income per Common Share of th66

Income per Common Share of the Trust (Units and Distributions) (Details) - Common shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Increase in shares of the Trust/units of general partner from the conversion of limited partners' units	9,044	14,491	3,000
Distributions per common share	$ 1.90	$ 1.90	$ 1.90

Income per Common Unit of the67

Income per Common Unit of the Operating Partnership (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income
Income from continuing operations net of noncontrolling interest									$ 356,817	$ 239,483	$ 170,772
Income from discontinued operations									0	0	48,581
Income available to common shareholders									$ 356,817	$ 239,483	$ 218,211
Weighted Average Shares
Income from continuing operations net of noncontrolling interest - basic (shares)									146,204	148,243	147,216
Dilutive shares/units for long-term compensation plans (shares)									685	600	670
Income from continuing operations net of noncontrolling interest - diluted (shares)									146,889	148,843	147,886
Per Share/Unit
Net income available to common shareholders - basic (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.56	$ 0.61	$ 0.24	$ 0.21
Per Share
Income per common share - diluted (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.55	$ 0.61	$ 0.24	$ 0.21
Liberty Property Limited Partnership [Member]
Income
Income from continuing operations net of noncontrolling interest									$ 365,887	$ 245,675	$ 175,343
Less: Preferred unit distributions									(472)	(472)	(472)
Income from continuing operations available to common unitholders											174,871
Income from discontinued operations									0	0	48,581
Income available to common shareholders									$ 365,415	$ 245,203	$ 223,452
Weighted Average Shares
Income from continuing operations net of noncontrolling interest - basic (shares)									149,740	151,783	150,770
Dilutive shares/units for long-term compensation plans (shares)									685	600	670
Income from continuing operations net of noncontrolling interest - diluted (shares)									150,425	152,383	151,440
Liberty Property Limited Partnership [Member] | Common units [Member]
Per Share/Unit
Income from continuing operations net of noncontrolling interest - basic (USD per share/unit)									$ 2.44	$ 1.62	$ 1.16
Discontinued operations net of noncontrolling interest - basic (USD per share/unit)									0	0	0.32
Net income available to common shareholders - basic (USD per share/unit)									2.44	1.62	1.48
Per Share
Income from continuing operations net of noncontrolling interest - diluted (USD per share/unit)									2.43	1.61	1.16
Discontinued operations net of noncontrolling interest - diluted (USD per share/unit)									0	0	0.32
Income per common share - diluted (USD per share/unit)									$ 2.43	$ 1.61	$ 1.48

Income per Common Unit of the68

Income per Common Unit of the Operating Partnership (Anti-Dilutive) (Details) - Stock Option [Member] - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options that were excluded from the computation of diluted income per common share	755	1,500	850
Liberty Property Limited Partnership [Member]
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options that were excluded from the computation of diluted income per common share	755	1,500	850

Income per Common Unit of the69

Income per Common Unit of the Operating Partnership (Exercise of Options) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	369,000	65,000	44,000

Income per Common Unit of the70

Income per Common Unit of the Operating Partnership (Units and Distributions) (Details) - Liberty Property Limited Partnership [Member] - Common units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Distributions per common unit	$ 1.90	$ 1.90	$ 1.90
Limited Partner [Member]
Class of Stock [Line Items]
Number of common units converted	9,044	14,491	3,000

Accumulated Other Comprehensi71

Accumulated Other Comprehensive Loss - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	[1]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	$ 3,030,254	$ 3,106,312
Ending Balance	3,062,923	3,030,254
Total equity	3,030,254	3,106,312	$ 3,062,923	$ 3,030,254	$ 3,117,062
Total accumulated other comprehensive loss included in shareholders' equity			3,003,391	2,972,581
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	(22,023)	(9,483)
Other comprehensive income (loss), before reclassifications	(34,744)	(12,540)
Ending Balance	(56,767)	(22,023)
Total equity	(22,023)	(9,483)	(56,767)	(22,023)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	(865)	(377)
Other comprehensive income (loss), before reclassifications	(659)	(1,884)
Reclassification adjustment	1,069	1,396
Ending Balance	(455)	(865)
Total equity	(865)	(377)	(455)	(865)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	(22,888)
Ending Balance	(57,222)	(22,888)
Total equity	(22,888)	(22,888)	(57,222)	(22,888)
AOCI Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	382
Ending Balance	1,191	382
Total equity	382	382	1,191	382
AOCI Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance	(22,506)	(9,784)
Ending Balance	(56,031)	(22,506)
Total equity	$ (22,506)	$ (9,784)	(56,031)	(22,506)	$ 7,437
Total accumulated other comprehensive loss included in shareholders' equity			$ (56,031)	$ (22,506)
[1]	The Company adjusted the January 1, 2014 balances of Accumulated Other Comprehensive (Loss) Income, Distributions in Excess of Net Income, and Noncontrolling Interest - Operating Partnership - Common from previous filings. See Note 2.

Real Estate (Carrying Value of

Real Estate (Carrying Value of Properties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	$ 1,094,470	$ 1,184,927
Building and improvements	4,501,921	5,131,648
Accumulated Depreciation	940,115	1,148,928
Total Real Estate	5,596,391	6,316,575
Depreciation	166,800	181,000	$ 179,100
Industrial Property [Member]
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	919,951	824,140
Building and improvements	3,757,063	3,637,484
Accumulated Depreciation	734,595	698,456
Total Real Estate	4,677,014	4,461,624
Office Building [Member]
Real Estate Investment Property, at Cost [Abstract]
Land and Land Improvements	174,519	360,787
Building and improvements	744,858	1,494,164
Accumulated Depreciation	205,520	450,472
Total Real Estate	$ 919,377	$ 1,854,951

Real Estate (Real Estate Proper

Real Estate (Real Estate Properties Sold) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)aft²bldg	Dec. 31, 2015USD ($)aft²bldg	Dec. 31, 2014USD ($)
Disposition Disclosures [Line Items]
Gross proceeds	$ 1,192,918	$ 530,440	$ 559,322
2015 sales [Member] | Richmond Hampton Roads Sale [Member] | Immediate Family Member of Management or Principal Owner [Member] | Building and Building Improvements [Member] | Carolinas Richmond [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		22
2015 sales [Member] | Richmond Hampton Roads Sale [Member] | Immediate Family Member of Management or Principal Owner [Member] | Land and Land Improvements [Member] | Carolinas Richmond [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		3
2015 sales [Member] | Richmond Hampton Roads Sale [Member] | Immediate Family Member of Management or Principal Owner [Member] | Land, Buildings and Improvements [Member] | Carolinas Richmond [Member]
Disposition Disclosures [Line Items]
Gross proceeds		$ 110,300
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	125
Leaseable square feet | ft²	9,463,990
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Chicago Milwaukee [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	1
Leaseable square feet | ft²	171,114
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	51
Leaseable square feet | ft²	3,509,641
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Lehigh Central PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	1
Leaseable square feet | ft²	120,777
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	23
Leaseable square feet | ft²	1,866,161
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Philadelphia [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	18
Leaseable square feet | ft²	1,631,295
Not Discontinued Operations [Member] | 2016 sales [Member] | Building and Building Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg	31
Leaseable square feet | ft²	2,165,002
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	36
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Chicago Milwaukee [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	5
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	12
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Lehigh Central PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	0
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	0
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Philadelphia [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	1
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	18
Not Discontinued Operations [Member] | 2016 sales [Member] | Land and Land Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a	0
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	$ 1,210,555
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Chicago Milwaukee [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	10,625
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	505,828
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Lehigh Central PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	11,200
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	189,200
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Philadelphia [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	2,640
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	224,241
Not Discontinued Operations [Member] | 2016 sales [Member] | Land, Buildings and Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds	266,821
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		81
Leaseable square feet | ft²		5,710,173
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		4
Leaseable square feet | ft²		874,125
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		2
Leaseable square feet | ft²		222,642
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		7
Leaseable square feet | ft²		569,618
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Southeastern PA [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		41
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		46
Leaseable square feet | ft²		2,724,489
Not Discontinued Operations [Member] | 2015 sales [Member] | Building and Building Improvements [Member] | Carolinas Richmond [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Number of buildings | bldg		22
Leaseable square feet | ft²		1,319,299
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		23
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		0
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		0
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		0
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Southeastern PA [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		20
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		20
Not Discontinued Operations [Member] | 2015 sales [Member] | Land and Land Improvements [Member] | Carolinas Richmond [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Acres of developable land | a		3
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		$ 545,133
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Florida [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		55,425
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Minnesota [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		25,700
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Other Segments [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		37,371
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Southeastern PA [Member]
Disposition Disclosures [Line Items]
Gain on sale of property	$ 14,300	14,300
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Southeastern PA [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		316,583
Not Discontinued Operations [Member] | 2015 sales [Member] | Land, Buildings and Improvements [Member] | Carolinas Richmond [Member] | Operating Segments [Member]
Disposition Disclosures [Line Items]
Gross proceeds		$ 110,054

Real Estate (Real Estate Prop74

Real Estate (Real Estate Properties Acquired) (Details) - Operating Segments [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)aft²bldg	Dec. 31, 2015USD ($)aft²bldg
2016 acquisitions [Member] | Building and Building Improvements [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	1
Leaseable square feet | ft²	73,160
2016 acquisitions [Member] | Building and Building Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
2016 acquisitions [Member] | Building and Building Improvements [Member] | Chicago Milwaukee [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	1
Leaseable square feet | ft²	73,160
2016 acquisitions [Member] | Building and Building Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
2016 acquisitions [Member] | Building and Building Improvements [Member] | Philadelphia [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
2016 acquisitions [Member] | Building and Building Improvements [Member] | Southeastern PA [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
2016 acquisitions [Member] | Building and Building Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Number of buildings | bldg	0
Leaseable square feet | ft²	0
2016 acquisitions [Member] | Land and Land Improvements [Member]
Business Acquisition [Line Items]
Acres of developable land | a	217
2016 acquisitions [Member] | Land and Land Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Acres of developable land | a	13
2016 acquisitions [Member] | Land and Land Improvements [Member] | Chicago Milwaukee [Member]
Business Acquisition [Line Items]
Acres of developable land | a	6
2016 acquisitions [Member] | Land and Land Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Acres of developable land | a	76
2016 acquisitions [Member] | Land and Land Improvements [Member] | Philadelphia [Member]
Business Acquisition [Line Items]
Acres of developable land | a	6
2016 acquisitions [Member] | Land and Land Improvements [Member] | Southeastern PA [Member]
Business Acquisition [Line Items]
Acres of developable land | a	8
2016 acquisitions [Member] | Land and Land Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Acres of developable land | a	108
2016 acquisitions [Member] | Land, Buildings and Improvements [Member]
Business Acquisition [Line Items]
Purchase price | $	$ 60,892
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Purchase price | $	2,251
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Chicago Milwaukee [Member]
Business Acquisition [Line Items]
Purchase price | $	11,064
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Purchase price | $	15,395
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Philadelphia [Member]
Business Acquisition [Line Items]
Purchase price | $	13,943
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Southeastern PA [Member]
Business Acquisition [Line Items]
Purchase price | $	3,344
2016 acquisitions [Member] | Land, Buildings and Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Purchase price | $	$ 14,895
2015 acquisitions [Member] | Building and Building Improvements [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		5
Leaseable square feet | ft²		1,529,211
2015 acquisitions [Member] | Building and Building Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		0
Leaseable square feet | ft²		0
2015 acquisitions [Member] | Building and Building Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		0
Leaseable square feet | ft²		0
2015 acquisitions [Member] | Building and Building Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		1
Leaseable square feet | ft²		410,059
2015 acquisitions [Member] | Building and Building Improvements [Member] | Houston [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		3
Leaseable square feet | ft²		921,196
2015 acquisitions [Member] | Building and Building Improvements [Member] | Minnesota [Member]
Business Acquisition [Line Items]
Number of buildings | bldg		1
Leaseable square feet | ft²		197,956
2015 acquisitions [Member] | Land and Land Improvements [Member]
Business Acquisition [Line Items]
Acres of developable land | a		758
2015 acquisitions [Member] | Land and Land Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Acres of developable land | a		94
2015 acquisitions [Member] | Land and Land Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Acres of developable land | a		281
2015 acquisitions [Member] | Land and Land Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Acres of developable land | a		56
2015 acquisitions [Member] | Land and Land Improvements [Member] | Houston [Member]
Business Acquisition [Line Items]
Acres of developable land | a		139
2015 acquisitions [Member] | Land and Land Improvements [Member] | Minnesota [Member]
Business Acquisition [Line Items]
Acres of developable land | a		188
2015 acquisitions [Member] | Land, Buildings and Improvements [Member]
Business Acquisition [Line Items]
Purchase price | $		$ 220,415
2015 acquisitions [Member] | Land, Buildings and Improvements [Member] | Carolinas Richmond [Member]
Business Acquisition [Line Items]
Purchase price | $		1,727
2015 acquisitions [Member] | Land, Buildings and Improvements [Member] | Lehigh Central PA [Member]
Business Acquisition [Line Items]
Purchase price | $		62,402
2015 acquisitions [Member] | Land, Buildings and Improvements [Member] | Other Segments [Member]
Business Acquisition [Line Items]
Purchase price | $		45,248
2015 acquisitions [Member] | Land, Buildings and Improvements [Member] | Houston [Member]
Business Acquisition [Line Items]
Purchase price | $		86,497
2015 acquisitions [Member] | Land, Buildings and Improvements [Member] | Minnesota [Member]
Business Acquisition [Line Items]
Purchase price | $		$ 24,541

Investments in Unconsolidated75

Investments in Unconsolidated Joint Ventures (Liberty Venture I, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)ft²properties	Dec. 31, 2015USD ($)aproperties	Dec. 31, 2014USD ($)aft²properties
Schedule of Equity Method Investments [Line Items]
Gross proceeds	$ 1,192,918	$ 530,440	$ 559,322
New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Leaseable square feet | ft²	4,500
Building and Building Improvements [Member] | New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | a		198,000
Gross proceeds		$ 8,500
Construction in Progress [Member] | New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	1
Leaseable square feet | ft²	302
Anticipated aggregate investment	$ 20,500
Industrial Property [Member] | Building and Building Improvements [Member] | New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	28
Joint venture sales, 2015 [Member] | Building and Building Improvements [Member] | New Jersey [Member] | Liberty Venture I, LP [Member] | Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties		1
Equity Method Investee [Member] | Liberty Venture I, LP [Member] | New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 2,300	$ 1,600	$ 1,400
Prepaid Expenses and Other Current Assets [Member] | Equity Method Investee [Member] | Liberty Venture I, LP [Member] | New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 250	$ 451
Joint venture acquisitions, 2014 [Member] | General Partner [Member] | Purchase from liberty property limited partnership [Member] | Building and Building Improvements [Member] | New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties			3
Leaseable square feet | ft²			603
Purchases from related party			$ 43,000
Revenue from related parties			$ 2,500
Joint venture acquisitions, 2014 [Member] | General Partner [Member] | Purchase from liberty property limited partnership [Member] | Land and Land Improvements [Member] | New Jersey [Member] | Liberty Venture I, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land | a			51

Investments in Unconsolidated76

Investments in Unconsolidated Joint Ventures (Kings Hill Unit Trust) (Details) - United Kingdom [Member] ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)ft²properties	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Kings Hill Unit Trust [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Note receivable interest rate	10.00%
Management fees revenue	$ 293	$ 304	$ 285
Building and Building Improvements [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | ft²	490
Building and Building Improvements [Member] | Industrial Property [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	3
Building and Building Improvements [Member] | Office Building [Member] | Kings Hill Unit Trust [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	11
Investments in and advances to unconsolidated joint ventures [Member] | Kings Hill Unit Trust [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Notes receivable	$ 4,100	4,700
Prepaid Expenses and Other Current Assets [Member] | Kings Hill Unit Trust [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 121	$ 271

Investments in Unconsolidated77

Investments in Unconsolidated Joint Ventures (Liberty Illinois, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)aft²properties	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of properties	$ 219,270	$ 100,314	$ 91,778
Joint venture, 2016 sales current quarter [Member] | Building and Building Improvements [Member] | Liberty Illinois, LP [Member] | Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	4
Leaseable square feet | ft²	636
Proceeds from sale of property	$ 32,500
Gain (Loss) on Investments [Member] | General Partner [Member] | Joint venture, 2016 sales current quarter [Member] | Building and Building Improvements [Member] | Liberty Illinois, LP [Member] | Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of properties	$ 1,000
Chicago Milwaukee [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Chicago Milwaukee [Member] | Building and Building Improvements [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | ft²	4,900
Chicago Milwaukee [Member] | Building and Building Improvements [Member] | Industrial Property [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	12
Chicago Milwaukee [Member] | Land and Land Improvements [Member] | Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land | a	248
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 1,000	$ 1,300	$ 1,000
Prepaid Expenses and Other Current Assets [Member] | Liberty Illinois, LP [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 132

Investments in Unconsolidated78

Investments in Unconsolidated Joint Ventures (Liberty Washington, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)aft²properties	Dec. 31, 2015USD ($)aproperties	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Gain (loss) on debt extinguishment	$ (27,099)	$ 0	$ 0
Gain (loss) on sale of properties	219,270	100,314	91,778
Gross proceeds	1,192,918	530,440	559,322
Impairment - real estate assets	$ 3,879	18,244	117
Northern Virginia and Washington DC [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Impairment - real estate assets			172,700
Northern Virginia [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Impairment - real estate assets		$ 56,800
Building and Building Improvements [Member] | Northern Virginia and Washington DC [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | ft²	451
Building and Building Improvements [Member] | Northern Virginia and Washington DC [Member] | Office Building [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	2
Joint venture, 2016 sales current quarter [Member] | Building and Building Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations, Disposed of by Sale [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	12
Leaseable square feet | ft²	1,200
Proceeds from sale of property	$ 187,200
Joint venture, 2016 sales current quarter [Member] | Land and Land Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations, Disposed of by Sale [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land | a	6
Joint venture, 2016 transfer to lender [Member] | Building and Building Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations, Disposed of by Means Other than Sale [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties	6
Leaseable square feet | ft²	698
Joint venture sales, 2015 [Member] | Building and Building Improvements [Member] | Northern Virginia [Member] | Liberty Washington, LP [Member] | Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | properties		1
Leaseable square feet | a		80,000
Gross proceeds		$ 5,000
Mortgages [Member] | Joint venture, 2016 transfer to lender [Member] | Building and Building Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations, Disposed of by Means Other than Sale [Member]
Schedule of Equity Method Investments [Line Items]
Extinguishment of debt	$ 112,500
General Partner [Member] | Gain (Loss) on Investments [Member] | Joint venture, 2016 sales current quarter [Member] | Building and Building Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of properties	6,000
General Partner [Member] | Gain (Loss) on Investments [Member] | Mortgages [Member] | Joint venture, 2016 transfer to lender [Member] | Building and Building Improvements [Member] | Liberty Washington, LP [Member] | Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on debt extinguishment	4,200
Liberty Washington, LP [Member] | Equity Method Investee [Member] | Northern Virginia and Washington DC [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	2,000	4,800	$ 4,400
Prepaid Expenses and Other Current Assets [Member] | Liberty Washington, LP [Member] | Equity Method Investee [Member] | Northern Virginia and Washington DC [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 322	693
Investments in and advances to unconsolidated joint ventures [Member] | General Partner [Member] | Northern Virginia [Member] | Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Impairment - real estate assets		$ 11,500

Investments in Unconsolidated79

Investments in Unconsolidated Joint Ventures (Liberty/Comcast 1701 JFK Boulevard, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)ft²	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Philadelphia [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Philadelphia [Member] | Equity Method Investee [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 2,700	$ 2,700	$ 2,400
Philadelphia [Member] | Building and Building Improvements [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | ft²	1,250
Philadelphia [Member] | Investments in and advances to unconsolidated joint ventures [Member] | Equity Method Investee [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties	$ 59	59
Philadelphia [Member] | Prepaid Expenses and Other Current Assets [Member] | Equity Method Investee [Member] | Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 401	$ 407

Investments in Unconsolidated80

Investments in Unconsolidated Joint Ventures (Liberty Property 18th & Arch LP and Liberty Property 18th & Arch Hotel, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)ft²condominium_unit	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Jun. 30, 2014USD ($)ft²roomstoryinvestment
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	$ 245,078	$ 218,454
Development in progress	267,450	360,948
Gain (loss) on sale of properties	219,270	100,314	$ 91,778
Liberty Property 18th & Arch [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	133,000
Philadelphia [Member] | Liberty Property 18th & Arch [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity method investments | investment				2
Anticipated investment in joint ventures				$ 186,000
Ownership percentage				20.00%
Development in progress	$ 671,000
Philadelphia [Member] | Construction in Progress [Member] | Liberty Property 18th & Arch [Member]
Schedule of Equity Method Investments [Line Items]
Number of stories in a high-rise building | story				59
Leaseable square feet | ft²				1,300
Number of hotel rooms | room				222
Anticipated aggregate investment				$ 932,000
Liberty Property 18th & Arch [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet | ft²	15
Number of Residential Condominium Units | condominium_unit	3
Proceeds from sale of property	$ 14,300
Gain (loss) on sale of properties	300
Liberty Property 18th & Arch [Member] | Equity Method Investee [Member] | Prepaid Expenses and Other Current Assets [Member] | Philadelphia [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	1,300
Liberty Property 18th & Arch [Member] | Equity Method Investee [Member] | Other Liabilities [Member] | Philadelphia [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties		1,200
Liberty Property 18th & Arch [Member] | Equity Method Investee [Member] | Other Income [Member] | Philadelphia [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 4,800	$ 5,100	$ 1,800

Investments in Unconsolidated81

Investments in Unconsolidated Joint Ventures (Other Joint Ventures) (Details) - Other Joint Ventures [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)ainvestmentproperties	Dec. 31, 2015USD ($)
Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Building and Building Improvements [Member] | Orlando [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity method investments | investment	3
Number of properties | properties	6
Building and Building Improvements [Member] | United Kingdom [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of joint venture	$ 13,700
Loss on sale of join venture	$ 6
Land and Land Improvements [Member] | Philadelphia [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Acres of developable land | a	1
Investments in and advances to unconsolidated joint ventures [Member] | Cambridge Medipark Ltd [Member] | Equity Method Investee [Member] | United Kingdom [Member]
Schedule of Equity Method Investments [Line Items]
Notes payable	$ 2,300	$ 2,700

Investments in Unconsolidated82

Investments in Unconsolidated Joint Ventures (Summary Financial Data) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Real estate assets	$ 1,473,229	$ 1,694,165
Accumulated depreciation	(300,503)	(285,535)
Real estate assets, net	1,172,726	1,408,630
Development in progress	677,918	398,892
Land held for development	73,826	77,556
Other assets	200,663	209,271
Total assets	2,125,133	2,094,349
Liabilities and Equity
Debt	846,328	1,061,218
Other liabilities	166,697	136,847
Equity	1,112,108	896,284
Total liabilities and equity	2,125,133	2,094,349
Company's net investment in unconsolidated joint ventures	245,078	218,454
Condensed Statements of Operations
Total revenue	178,876	211,327	$ 203,006
Operating expense	67,427	82,565	75,752
Operating income (loss)	111,449	128,762	127,254
Interest	(47,044)	(59,509)	(61,326)
Depreciation and amortization	(44,709)	(54,766)	(60,866)
Other income (expense)	8,474	55,960	9,404
Gain (loss) on sale/impairment	45,000	(56,032)	(172,504)
Net income (loss)	73,170	14,415	(158,038)
Company's equity in earnings (loss) of unconsolidated joint ventures	21,970	3,149	10,314
Difference between carrying amount and underlying equity	1,400	4,500
Liberty Venture I, LP [Member]
Assets
Real estate assets	226,313	168,690
Accumulated depreciation	(42,779)	(37,473)
Real estate assets, net	183,534	131,217
Development in progress	6,886	34,878
Land held for development	0	4,471
Other assets	23,494	14,860
Total assets	213,914	185,426
Liabilities and Equity
Debt	154,386	121,793
Other liabilities	6,673	10,571
Equity	52,855	53,062
Total liabilities and equity	213,914	185,426
Company's net investment in unconsolidated joint ventures	11,175	11,563
Condensed Statements of Operations
Total revenue	25,149	23,708	19,277
Operating expense	6,835	7,977	6,398
Operating income (loss)	18,314	15,731	12,879
Interest	(4,182)	(5,415)	(5,078)
Depreciation and amortization	(6,375)	(6,399)	(5,757)
Other income (expense)	50	68	(17)
Gain (loss) on sale/impairment	0	760	0
Net income (loss)	7,807	4,745	2,027
Company's equity in earnings (loss) of unconsolidated joint ventures	2,332	1,540	788
Kings Hill Unit Trust [Member]
Assets
Real estate assets	137,960	164,603
Accumulated depreciation	(26,872)	(28,513)
Real estate assets, net	111,088	136,090
Development in progress	0	0
Land held for development	0	0
Other assets	9,603	8,967
Total assets	120,691	145,057
Liabilities and Equity
Debt	83,846	99,603
Other liabilities	24,513	27,408
Equity	12,332	18,046
Total liabilities and equity	120,691	145,057
Company's net investment in unconsolidated joint ventures	5,349	6,789
Condensed Statements of Operations
Total revenue	11,926	12,602	13,221
Operating expense	4,854	5,261	5,387
Operating income (loss)	7,072	7,341	7,834
Interest	(2,554)	(6,116)	(6,110)
Depreciation and amortization	(3,557)	(3,954)	(4,135)
Other income (expense)	(77)	45,604	208
Gain (loss) on sale/impairment	0	0	0
Net income (loss)	884	42,875	(2,203)
Company's equity in earnings (loss) of unconsolidated joint ventures	275	(425)	(288)
Liberty Illinois, LP [Member]
Assets
Real estate assets	251,765	263,552
Accumulated depreciation	(51,901)	(54,308)
Real estate assets, net	199,864	209,244
Development in progress	0	22,998
Land held for development	31,567	28,590
Other assets	19,036	20,668
Total assets	250,467	281,500
Liabilities and Equity
Debt	137,294	155,601
Other liabilities	8,433	8,594
Equity	104,740	117,305
Total liabilities and equity	250,467	281,500
Company's net investment in unconsolidated joint ventures	15,339	18,221
Condensed Statements of Operations
Total revenue	26,599	26,085	25,181
Operating expense	9,961	9,303	8,965
Operating income (loss)	16,638	16,782	16,216
Interest	(7,243)	(8,441)	(7,932)
Depreciation and amortization	(7,589)	(7,406)	(7,380)
Other income (expense)	64	29	39
Gain (loss) on sale/impairment	4,068	0	187
Net income (loss)	5,938	964	1,130
Company's equity in earnings (loss) of unconsolidated joint ventures	2,065	807	824
Liberty Washington, LP [Member]
Assets
Real estate assets	289,627	534,132
Accumulated depreciation	(44,235)	(43,224)
Real estate assets, net	245,392	490,908
Development in progress	0	0
Land held for development	0	2,000
Other assets	18,749	52,429
Total assets	264,141	545,337
Liabilities and Equity
Debt	103,667	314,080
Other liabilities	4,385	10,634
Equity	156,089	220,623
Total liabilities and equity	264,141	545,337
Company's net investment in unconsolidated joint ventures	38,863	55,552
Condensed Statements of Operations
Total revenue	39,727	71,101	72,824
Operating expense	15,935	27,384	28,349
Operating income (loss)	23,792	43,717	44,475
Interest	(10,866)	(17,353)	(18,612)
Depreciation and amortization	(10,750)	(20,725)	(27,112)
Other income (expense)	257	531	375
Gain (loss) on sale/impairment	40,943	(56,792)	(172,691)
Net income (loss)	43,376	(50,622)	(173,565)
Company's equity in earnings (loss) of unconsolidated joint ventures	10,857	(7,314)	2,251
Liberty Comcast 1701 JFK Boulevard, LP [Member]
Assets
Real estate assets	495,842	495,248
Accumulated depreciation	(125,014)	(111,067)
Real estate assets, net	370,828	384,181
Development in progress	0	0
Land held for development	0	0
Other assets	48,074	47,441
Total assets	418,902	431,622
Liabilities and Equity
Debt	309,475	313,402
Other liabilities	9,964	9,618
Equity	99,463	108,602
Total liabilities and equity	418,902	431,622
Company's net investment in unconsolidated joint ventures	18,688	20,465
Condensed Statements of Operations
Total revenue	65,587	68,444	63,580
Operating expense	26,761	29,692	23,557
Operating income (loss)	38,826	38,752	40,023
Interest	(19,737)	(19,936)	(20,179)
Depreciation and amortization	(14,513)	(14,442)	(14,591)
Other income (expense)	(213)	(227)	(278)
Gain (loss) on sale/impairment	0	0	0
Net income (loss)	4,363	4,147	4,975
Company's equity in earnings (loss) of unconsolidated joint ventures	1,594	2,053	1,633
Liberty Property 18th & Arch [Member]
Assets
Real estate assets	0	0
Accumulated depreciation	0	0
Real estate assets, net	0	0
Development in progress	671,032	323,615
Land held for development	0	0
Other assets	52,053	15,594
Total assets	723,085	339,209
Liabilities and Equity
Debt	0	0
Other liabilities	95,574	40,958
Equity	627,511	298,251
Total liabilities and equity	723,085	339,209
Company's net investment in unconsolidated joint ventures	132,952	62,677
Condensed Statements of Operations
Total revenue	0	0	0
Operating expense	280	221	199
Operating income (loss)	(280)	(221)	(199)
Interest	0	0	0
Depreciation and amortization	0	0	0
Other income (expense)	1,270	30	(13)
Gain (loss) on sale/impairment	0	0	0
Net income (loss)	990	(191)	(212)
Company's equity in earnings (loss) of unconsolidated joint ventures	213	(29)	(33)
Other Joint Ventures [Member]
Assets
Real estate assets	71,722	67,940
Accumulated depreciation	(9,702)	(10,950)
Real estate assets, net	62,020	56,990
Development in progress	0	17,401
Land held for development	42,259	42,495
Other assets	29,654	49,312
Total assets	133,933	166,198
Liabilities and Equity
Debt	57,660	56,739
Other liabilities	17,155	29,064
Equity	59,118	80,395
Total liabilities and equity	133,933	166,198
Company's net investment in unconsolidated joint ventures	22,712	43,187
Condensed Statements of Operations
Total revenue	9,888	9,387	8,923
Operating expense	2,801	2,727	2,897
Operating income (loss)	7,087	6,660	6,026
Interest	(2,462)	(2,248)	(3,415)
Depreciation and amortization	(1,925)	(1,840)	(1,891)
Other income (expense)	7,123	9,925	9,090
Gain (loss) on sale/impairment	(11)	0	0
Net income (loss)	9,812	12,497	9,810
Company's equity in earnings (loss) of unconsolidated joint ventures	4,634	6,517	5,139
Cambridge Medipark Ltd [Member] | Leaseholds and Leasehold Improvements [Member]
Condensed Statements of Operations
Gain (loss) on sale/impairment	$ 7,100	$ 9,900	$ 9,100

Deferred Financing and Leasin83

Deferred Financing and Leasing Costs (Deferred Financing and Leasing Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-lived intangible assets
Deferred financing costs	$ 11,917	$ 11,917
Deferred leasing costs	190,849	229,798
Market value intangible	19,451	20,178
Origination value intangible	83,485	106,014
Finite-lived intangible assets, gross	305,702	367,907
Accumulated amortization:
Deferred financing costs	(10,152)	(8,713)
Deferred leasing costs	(76,174)	(97,840)
Market value intangible	(12,626)	(10,358)
Origination value intangible	(53,357)	(58,887)
Finite-lived intangible assets, accumulated amortization	(152,309)	(175,798)
Deferred financing and leasing costs, net	153,393	192,109
Amortization of deferred financing costs	3,974	4,395	$ 4,811
Amortization of intangible assets	$ 37,100	$ 44,200	$ 51,300

Deferred Financing and Leasin84

Deferred Financing and Leasing Costs (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Unamortized market value intangible liabilities	$ 4.4	$ 6.1
Amortization of above and below Market Leases	$ (1.6)	$ (1.9)	$ (2.8)
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period	3 years 8 months
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period	4 years 7 months 2 days

Deferred Financing and Leasin85

Deferred Financing and Leasing Costs (Intangible Amortization Schedule) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Deferred financing and leasing costs, net	$ 153,393	$ 192,109
Leases, Acquired-in-Place, Market Adjustment [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,017	1,446
2,018	1,425
2,019	900
2,020	5
2,021	(142)
Thereafter	(1,181)
Deferred financing and leasing costs, net	2,453
Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,017	10,985
2,018	7,310
2,019	4,316
2,020	2,164
2,021	1,450
Thereafter	3,903
Deferred financing and leasing costs, net	$ 30,128

Indebtedness (Overview) (Detail

Indebtedness (Overview) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Weighted average interest rate	4.30%	4.60%	5.00%
Interest costs capitalized	$ 24.1	$ 16.7	$ 13.2
Cash paid for interest	$ 142.7	$ 149.6	$ 164.9

Indebtedness (Amortization and

Indebtedness (Amortization and Maturity Schedule) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
2,017	$ 7,896
2,018	33,572
2,019	56,709
2,020	420,721
2,021	67,417
2,022	402,172
2,023	302,281
2,024	452,385
2,025	402,513
2026 and thereafter	424,240
Subtotal	2,569,906
Reconciling items	(12,970)
Total for consolidated balance sheet	$ 2,556,936
Weighted average interest rate	4.04%
Principal Amortization, Mortgages [Member]
Debt Instrument [Line Items]
2,017	$ 7,896
2,018	6,470
2,019	6,666
2,020	3,351
2,021	2,326
2,022	2,172
2,023	2,281
2,024	2,385
2,025	2,513
2026 and thereafter	22,294
Subtotal	58,354
Reconciling items	6,744
Total for consolidated balance sheet	65,098
Principal Maturities, Mortgages [Member]
Debt Instrument [Line Items]
2,017	0
2,018	27,102
2,019	50,043
2,020	67,370
2,021	65,091
2,022	0
2,023	0
2,024	0
2,025	0
2026 and thereafter	1,946
Subtotal	211,552
Reconciling items	0
Total for consolidated balance sheet	211,552
Unsecured Debt [Member]
Debt Instrument [Line Items]
2,017	0
2,018	0
2,019	0
2,020	350,000
2,021	0
2,022	400,000
2,023	300,000
2,024	450,000
2,025	400,000
2026 and thereafter	400,000
Subtotal	2,300,000
Reconciling items	(19,714)
Total for consolidated balance sheet	2,280,286
Line of Credit [Member]
Debt Instrument [Line Items]
2,017	0
2,018	0
2,019	0
2,020	0
2,021	0
2,022	0
2,023	0
2,024	0
2,025	0
2026 and thereafter	0
Subtotal	0
Reconciling items	0
Total for consolidated balance sheet	$ 0
Due in Next Twelve Months [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.94%
Due in Year Two [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.96%
Due in Year Three [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.03%
Due in Year Four [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.93%
Due in Year Five [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.06%
Due in Year Six [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.13%
Due in Year Seven [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.39%
Due in Year Eight [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.40%
Due in Year Nine [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.76%
Due After Year Nine [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.34%

Indebtedness (Mortgage Loans an

Indebtedness (Mortgage Loans and Unsecured Notes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Aggregate notional amount	$ 98.9	$ 101.4
Mortgages [Member]
Debt Instrument [Line Items]
Maturity date range, start	Jan. 1, 2017
Maturity date range, end	Dec. 31, 2033
Net book value of collateralized real estate properties	$ 540.9
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Percentage bearing fixed interest, amount	2,569.9
Aggregate notional amount	$ 98.9
Fixed Rate Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate	3.00%
Fixed Rate Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate	6.40%
Mortgage Loans and Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted average remaining life	6 years 8 months

Indebtedness (Credit Facility)

Indebtedness (Credit Facility) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)extension	Dec. 31, 2015USD ($)
Line of Credit Facility [Line Items]
Amount outstanding	$ 0	$ 259,000,000
Letter of credit obligations	$ 6,900,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.05%
Commitment fee percentage	0.20%
Expiration date	Mar. 1, 2018
Number of maturity extensions | extension	2
Length of maturity extension	6 months
Competitive bid percentage	50.00%
Letter of credit obligations	$ 6,900,000
Maximum borrowing capacity	800,000,000
Accordion feature borrowing capacity	400,000,000
Borrowed funds for covenant ratio	$ 0.60
Covenant ratio	1.50
Debt covenant percentage	60.00%
Unencumbered net operating income to unsecured interest expense value for debt covenant	175.00%

Indebtedness (Activity) (Detail

Indebtedness (Activity) (Details) - USD ($)	1 Months Ended		12 Months Ended
	Nov. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 31, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,569,906,000
Loss on debt extinguishment			27,099,000	$ 0	$ 0
Senior Notes [Member] | 5.125% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate							5.125%
Repurchased face amount of debt							$ 300,000,000
Senior Notes [Member] | 3.75% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate							3.75%
Debt instrument, face amount							$ 400,000,000
Senior Notes [Member] | 3.25% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		3.25%
Debt instrument, face amount		$ 400,000,000
Senior Notes [Member] | 5.5% Senior Note [Member]
Debt Instrument [Line Items]
Stated interest rate		5.50%
Repurchased face amount of debt		$ 300,000,000
Loss on debt extinguishment		$ 3,800,000
Senior Notes [Member] | 6.625% Senior Note [Member]
Debt Instrument [Line Items]
Stated interest rate	6.625%
Repurchased face amount of debt	$ 296,500,000
Mortgages [Member] | 7.0% Mortgage [Member]
Debt Instrument [Line Items]
Stated interest rate						7.00%
Repurchased face amount of debt						$ 105,800,000
Mortgages [Member] | 7.5% Mortgage [Member]
Debt Instrument [Line Items]
Stated interest rate				7.50%
Repurchased face amount of debt				$ 59,700,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,300,000,000
Unsecured Debt [Member] | 3.435% unsecured notes [Member]
Debt Instrument [Line Items]
Stated interest rate				3.40%
Repurchased face amount of debt				$ 16,000,000
Medium-term Notes [Member] | 7.5% Medium Term Note [Member]
Debt Instrument [Line Items]
Stated interest rate	7.50%
Repurchased face amount of debt	$ 100,000,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 23,600,000

Leasing Activity (Details)

Leasing Activity (Details) $ in Thousands	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2,017	$ 441,839
2,018	403,254
2,019	353,110
2,020	287,720
2,021	236,993
Thereafter	891,413
Total	$ 2,614,329

Noncontrolling Interest - Ope92

Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) - Series I 2 [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Preferred Units [Line Items]
Amount	$ 7,537
Units (in units)	301,483
Liquidation preference	$ 25
Dividend rate	6.25%
Preferred Units, Total Annual Cash Distributions	$ 472	$ 472	$ 472

Shareholders' Equity - Trust (C

Shareholders' Equity - Trust (Common Shares) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Aug. 31, 2015USD ($)
Common Units
Units issued in connection with acquisitions | shares	0	0	0
Continuous Equity Offering
Maximum equity capacity	$ 200,000,000
Equity available	$ 125,000,000
Shares issued during period under continuous equity offerings, shares, new issues | shares	0	0	0
Share Repurchase
Share repurchase, value	$ 40,896,000	$ 71,802,000
Common units [Member]
Common Shares
Common units distributions (USD per share)	$ 285,900,000	$ 289,300,000	$ 286,900,000
Ordinary dividend (USD per share) | $ / shares	$ 1.0319	$ 1.4348	$ 1.2556
Qualified dividend (USD per share) | $ / shares	0.0013	0	0
Capital gain - 20% (USD per share) | $ / shares	0	0.1112	0
IRC Sec 1250 unrecapture gain - 25% (USD per share) | $ / shares	0.6176	0.3372	0.3712
Return of capital (USD per share) | $ / shares	0.2492	0.0168	0.2732
Total (USD per share) | $ / shares	$ 1.9	$ 1.9000	$ 1.9000
Common shares [Member]
Dividend Reinvestment and Share Purchase Plan
Dividend reinvestment plan | shares	56,426	1,036,437	1,643,536
Share Repurchase
Share repurchase, shares | shares	1,396,844	2,321,794
2015 Share Repurchase Program [Member] | Common shares [Member]
Share Repurchase
Stock repurchase program, authorized amount				$ 250,000,000
Share repurchase, shares | shares	1,400,000	2,300,000
Share repurchase, value	$ 40,900,000	$ 71,800,000
Liberty Property Limited Partnership [Member]
Common Units
Common units outstanding | shares	3,530,031	3,539,075
Closing price of the common shares	$ 139,400,000
Units issued in connection with acquisitions | shares	0	0	0
Share Repurchase
Share repurchase, value	$ 40,896,000	$ 71,802,000
Liberty Property Limited Partnership [Member] | Common units [Member]
Dividend Reinvestment and Share Purchase Plan
Dividend reinvestment plan | shares	56,426	1,036,437	1,643,536
Liberty Property Limited Partnership [Member] | 2015 Share Repurchase Program [Member] | Common units [Member]
Share Repurchase
Stock repurchase program, authorized amount				$ 250,000,000
Share repurchase, shares | shares	1,400,000	2,300,000
Share repurchase, value	$ 40,900,000	$ 71,800,000
Conversion Ratio of Common Units to Common Shares [Member]
Common Units
Common unit, convertible to common stock	1
Common stock, converted from common unit	1

Owners' Equity - Operating Pa94

Owners' Equity - Operating Partnership Common Units (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 31, 2015
Common Shares
Units issued in connection with acquisitions	0	0	0
Share Repurchase
Share repurchase, value	$ 40,896	$ 71,802
Liberty Property Limited Partnership [Member]
Common Shares
Common units outstanding	3,530,031	3,539,075
Closing price of the common shares	$ 139,400
Units issued in connection with acquisitions	0	0	0
Share Repurchase
Share repurchase, value	$ 40,896	$ 71,802
Liberty Property Limited Partnership [Member] | Common units [Member]
Dividend Reinvestment and Share Purchase Plan
Dividend reinvestment plan	56,426	1,036,437	1,643,536
Liberty Property Limited Partnership [Member] | 2015 Share Repurchase Program [Member] | Common units [Member]
Share Repurchase
Stock repurchase program, authorized amount				$ 250,000
Share repurchase, shares	1,400,000	2,300,000
Share repurchase, value	$ 40,900	$ 71,800

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - United States Pension Plan of US Entity [Member] - 401(k) [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Company match for defined contribution plan percentage	3.00%
Cost recognized	$ 874	$ 1,038	$ 943

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	21,100,000
Compensation cost capitalized	$ 1,200,000	$ 900,000	$ 1,000,000
Bonus Shares and Plans
Common shares reserved for future issuance	5,264,285	5,574,605	6,100,098
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	750,000
Share-based compensation expense	$ 122,000	$ 62,000	$ 104,000
Bonus Shares and Plans
Maximum percent of salary contributed	10.00%
Discount on market value of shares	15.00%
Shares issued	11,022	13,127	12,612
Stock Options [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option term	10 years
Vesting period	3 years
Share-based compensation expense	$ 165,000	$ 1,500,000	$ 1,800,000
Shares granted	0
Weighted average fair value of options granted (USD per share)		$ 4.11	$ 4.09
Exercise price for options outstanding lower limit (USD per share)	$ 20.32
Exercise price for options outstanding upper limit (USD per share)	$ 49.74
Weighted average remaining contractual life of option outstanding	5 years 3 months 14 days
Weighted average remaining contractual life of options exercisable	4 years 5 months 1 day
Total intrinsic value of options exercised	$ 3,500,000	$ 364,000	$ 310,000
Number of options outstanding and exercisable that had an exercise price higher than closing price of the Company's shares	316,000
Number of options outstanding and exercisable that had an exercise price lower than the Company's share price	1,100,000
Aggregate intrinsic value of options	$ 6,400,000
Total cash received from the exercise of options	14,400,000	2,100,000	1,400,000
Unrecognized compensation costs related to nonvested options	$ 85,000
Compensation costs not yet recognized, period for recognition	6 months 9 days
Stock Options [Member] | First Portion [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	20.00%
Stock Options [Member] | Second Portion [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	50.00%
Stock Options [Member] | Third Portion [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	100.00%
Restricted Stock [Member] | Long Term Incentive Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 12,200,000	$ 10,000,000	$ 9,000,000
Shares granted	388,000
Compensation costs not yet recognized, period for recognition	1 year 2 months 1 day
Long Term Incentive Shares
Granted (USD per share)	$ 32.48	$ 35.14	$ 37.13
Total unrecognized compensation cost related to nonvested shares	$ 8,600,000
Total fair value of restricted shares vested	$ 9,000,000	$ 7,400,000	$ 9,300,000
Restricted Stock [Member] | Long Term Incentive Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock [Member] | Long Term Incentive Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) [Member] | Second Portion [Member] | 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years	3 years
Bonus Shares [Member] | Bonus Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 4,700,000	$ 3,900,000	$ 3,900,000
Shares granted	140,376	111,700	103,834
Bonus Shares and Plans
Percent of bonuses taken in cash	120.00%
Performance Shares [Member] | Profit Sharing Plan [Member]
Bonus Shares and Plans
Maximum percent of salary contributed	5.00%
Profit sharing plan expense	$ 669,000	$ 965,000	$ 543,000
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	272.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2015 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation		110.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2016 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	174.00%
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2014 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation			157.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | 2008 plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	200.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2015 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation		90.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2016 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	136.00%
Executives Other [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2014 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation			125.00%
Chief Financial Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2008 plan [Member] | 2016 Grant [Member]
Long Term Incentive Shares
Monte Carlo RSU Valuation	160.00%
Chief Financial Officer [Member] | Restricted Stock Units (RSUs) [Member] | First Portion [Member] | 2016 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Chief Financial Officer [Member] | Restricted Stock Units (RSUs) [Member] | Second Portion [Member] | 2016 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Share-Based Compensation (Valua

Share-Based Compensation (Valuation Assumptions) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		1.80%	1.60%
Dividend yield		5.20%	5.20%
Historical volatility factor		24.00%	23.60%
Weighted-average expected life		7 years	6 years
First Portion [Member] | 2016 Grant [Member] | 2008 plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.01%
Historical volatility factor	19.00%
First Portion [Member] | 2015 Grant [Member] | 2008 plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		0.99%
Historical volatility factor		17.00%
First Portion [Member] | 2014 Grant [Member] | 2008 plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.68%
Historical volatility factor			24.00%

Share-Based Compensation (Optio

Share-Based Compensation (Option Rollforward) (Details) - Options [Member] - Stock Options [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Options
Outstanding January 1, 2016 (in shares) | shares	2,609
Exercised (in shares) | shares	(451)
Forfeited (in shares) | shares	(231)
Outstanding December 31, 2016 (in shares) | shares	1,927
Exercisable at December 31, 2016 (in shares) | shares	1,436
Weighted Average Exercise Price
Outstanding January 1, 2016 (USD per share) | $ / shares	$ 36.08
Exercised (USD per share) | $ / shares	31.90
Forfeited (USD per share) | $ / shares	44.42
Outstanding December 31, 2016 (USD per share) | $ / shares	36.02
Exercisable at December 31, 2016 (USD per share) | $ / shares	$ 35.99

Share-Based Compensation (LTI S

Share-Based Compensation (LTI Share Activity) (Details) - Long Term Incentive Shares [Member] - Restricted Stock [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Nonvested at January 1, 2016 (shares)	723
Granted (shares)	388
Vested (shares)	(242)
Forfeited (shares)	(57)
Nonvested at December 31, 2016 (shares)	812	723
Weighted Avg. Grant Date Fair value
Nonvested at January 1, 2016 (USD per share)	$ 36.75
Granted (USD per share)	32.48	$ 35.14	$ 37.13
Vested (USD per share)	37.07
Forfeited (USD per share)	35.39
Nonvested at December 31, 2016 (USD per share)	$ 34.71	$ 36.75

Commitments and Contingencie100

Commitments and Contingencies (Future Minimum Rental Payments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2,017	$ 1,339
2,018	1,595
2,019	1,595
2,020	1,595
2,021	1,595
2022 though 2067	34,379
Total	42,098
Other Expenses
Operating ground lease expense	$ 1,000	$ 815	$ 454

Commitments and Contingencie101

Commitments and Contingencies (Legal Matters) (Details)	Dec. 31, 2016claim
Loss Contingency, Information about Litigation Matters [Abstract]
Number of legal proceedings	0

Commitments and Contingencie102

Commitments and Contingencies (Other) (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2016USD ($)ft²bldg	Dec. 31, 2015USD ($)
Supply Commitment [Line Items]
Letter of credit obligations	$ 6,900
Development in progress	267,450	$ 360,948
Deferred leasing costs	190,849	$ 229,798
Tenant improvements	4,000
Land Purchases [Member]
Supply Commitment [Line Items]
Remaining amount committed to future land purchases	$ 11,300
Construction in Progress [Member]
Supply Commitment [Line Items]
Number of buildings | bldg	25
Leaseable square feet | ft²	5.6
Anticipated aggregate investment	$ 537,100
Deferred leasing costs	7,500
Building and land parcels [Member]
Supply Commitment [Line Items]
Remaining amount committed or obligated to pay for the benefit of current or future tenants	15,000
Tenant Improvements [Member]
Supply Commitment [Line Items]
Maximum tenant improvements not yet completed	$ 31,300
Construction in Progress [Member] | Equity Method Investments [Member] | Construction in Progress [Member]
Supply Commitment [Line Items]
Number of buildings | bldg	2
Anticipated aggregate investment	$ 952,500
Building and Building Improvements [Member] | American Water Works, Inc [Member]
Supply Commitment [Line Items]
Other commitment	132,600
Costs incurred	$ 17,200

Quarterly Results of Operati103

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Operating revenue	$ 179,057	$ 190,857	$ 186,654	$ 190,140	$ 199,382	$ 198,972	$ 203,518	$ 206,901	$ 746,708	$ 808,773	$ 792,631
Net income	$ 200,291	$ 55,734	$ 51,057	$ 59,063	$ 83,841	$ 93,695	$ 36,526	$ 31,862	$ 366,145	$ 245,924	$ 224,471
Net income available to common shareholders - basic (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.56	$ 0.61	$ 0.24	$ 0.21
Income per common share - diluted (USD per share/unit)	$ 1.33	$ 0.37	$ 0.34	$ 0.39	$ 0.55	$ 0.61	$ 0.24	$ 0.21

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating revenue	$ 179,057,000	$ 190,857,000	$ 186,654,000	$ 190,140,000	$ 199,382,000	$ 198,972,000	$ 203,518,000	$ 206,901,000	$ 746,708,000	$ 808,773,000	$ 792,631,000
Operating Income (Loss)									255,102,000	257,132,000	257,306,000
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense									(115,077,000)	(135,779,000)	(151,887,000)
Loss on debt extinguishment									(27,099,000)	0	0
Depreciation and amortization expense									(207,673,000)	(229,779,000)	(236,075,000)
Impairment - real estate assets									(3,879,000)	(18,244,000)	(117,000)
Gain on property dispositions									219,270,000	100,314,000	45,147,000
Equity in earnings of unconsolidated joint ventures									21,970,000	3,149,000	10,314,000
General and administrative expense									(68,198,000)	(68,710,000)	(63,327,000)
Income taxes									(1,971,000)	(2,673,000)	(2,590,000)
Income from continuing operations									366,145,000	245,924,000	175,890,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenue									734,050,000	808,683,000	797,723,000
Operating Income (Loss)									468,786,000	504,774,000	493,234,000
Segment Reconciling Items [Member] | Development Service Fee Income [Member]
Segment Reporting Information [Line Items]
Operating revenue									12,941,000	0	0
Segment Reconciling Items [Member] | Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue									0	0	(4,728,000)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating revenue									(283,000)	90,000	(364,000)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense									(115,077,000)	(135,779,000)	(152,444,000)
Depreciation and amortization expense									(152,556,000)	(166,500,000)	(177,715,000)
Impairment - real estate assets									(3,879,000)	(18,244,000)	(117,000)
Gain on property dispositions									219,270,000	100,314,000	45,147,000
Equity in earnings of unconsolidated joint ventures									21,970,000	3,149,000	10,314,000
General and administrative expense									(45,357,000)	(44,529,000)	(38,041,000)
Discontinued operations excluding gain on property dispositions									0	0	(1,950,000)
Income taxes									47,000	(2,351,000)	(2,404,000)
Other									40,000	5,090,000	(134,000)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenue									0
North America [Member] | Operating Segments [Member] | Carolinas Richmond [Member]
Segment Reporting Information [Line Items]
Operating revenue									66,270,000	71,950,000	76,781,000
Operating Income (Loss)									46,170,000	47,849,000	48,935,000
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Operating revenue									42,836,000	37,431,000	33,068,000
Operating Income (Loss)									28,199,000	24,851,000	20,856,000
North America [Member] | Operating Segments [Member] | Florida [Member]
Segment Reporting Information [Line Items]
Operating revenue									99,733,000	127,184,000	135,203,000
Operating Income (Loss)									62,177,000	77,283,000	83,195,000
North America [Member] | Operating Segments [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Operating revenue									59,582,000	54,031,000	49,309,000
Operating Income (Loss)									32,499,000	31,159,000	29,134,000
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Operating revenue									141,046,000	133,473,000	118,145,000
Operating Income (Loss)									102,209,000	94,972,000	82,050,000
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Operating revenue									41,192,000	47,932,000	54,892,000
Operating Income (Loss)									17,059,000	20,112,000	26,464,000
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Operating revenue									41,838,000	40,490,000	35,238,000
Operating Income (Loss)									30,862,000	29,679,000	26,722,000
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Operating revenue									91,656,000	147,712,000	148,714,000
Operating Income (Loss)									53,947,000	80,458,000	81,183,000
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Operating revenue									136,521,000	133,345,000	130,013,000
Operating Income (Loss)									89,274,000	87,925,000	83,991,000
United Kingdom [Member] | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Operating revenue									13,376,000	15,135,000	16,360,000
Operating Income (Loss)									$ 6,390,000	$ 10,486,000	$ 10,704,000

Segment Information (Depreciati

Segment Information (Depreciation and amortization of leasing transaction costs) (Details) - Operating Segments [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	$ 53,273	$ 60,075	$ 54,903
United Kingdom [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	259	292	177
North America [Member] | Carolinas Richmond [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	4,944	5,307	6,607
North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	2,026	1,161	466
North America [Member] | Florida [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	6,605	9,407	9,324
North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	4,713	4,466	3,988
North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	12,262	11,641	10,157
North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	3,832	4,986	4,478
North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	2,706	2,220	1,803
North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	6,134	12,346	12,272
North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of tenant improvement and lease transaction costs	$ 9,792	$ 8,249	$ 5,631

Segment Information (Operating

Segment Information (Operating Revenues by Segment and Type) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Operating revenue	$ 179,057	$ 190,857	$ 186,654	$ 190,140	$ 199,382	$ 198,972	$ 203,518	$ 206,901	$ 746,708	$ 808,773	$ 792,631
Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									734,050	808,683	797,723
Segment Reconciling Items [Member] | Development Service Fee Income [Member]
Revenue from External Customer [Line Items]
Operating revenue									12,941	0	0
Segment Reconciling Items [Member] | Discontinued Operations [Member]
Revenue from External Customer [Line Items]
Operating revenue									0	0	(4,728)
Corporate, Non-Segment [Member]
Revenue from External Customer [Line Items]
Operating revenue									(283)	90	(364)
North America [Member] | Operating Segments [Member] | Carolinas Richmond [Member]
Revenue from External Customer [Line Items]
Operating revenue									66,270	71,950	76,781
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									42,836	37,431	33,068
North America [Member] | Operating Segments [Member] | Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									99,733	127,184	135,203
North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									59,582	54,031	49,309
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									141,046	133,473	118,145
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									41,192	47,932	54,892
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									41,838	40,490	35,238
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									91,656	147,712	148,714
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									136,521	133,345	130,013
United Kingdom [Member] | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									13,376	15,135	16,360
Industrial Property [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									529,268	514,896	477,788
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Carolinas Richmond [Member]
Revenue from External Customer [Line Items]
Operating revenue									66,270	62,075	56,794
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									42,836	37,431	33,068
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									66,028	67,149	62,689
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									58,370	53,802	49,309
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									138,766	131,168	115,821
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									22,171	24,721	25,378
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									12,842	11,809	10,072
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									19,448	28,457	28,895
Industrial Property [Member] | North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									91,762	86,180	82,672
Industrial Property [Member] | United Kingdom [Member] | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									10,775	12,104	13,090
Office Building [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									204,782	293,787	319,935
Office Building [Member] | North America [Member] | Operating Segments [Member] | Carolinas Richmond [Member]
Revenue from External Customer [Line Items]
Operating revenue									0	9,875	19,987
Office Building [Member] | North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Revenue from External Customer [Line Items]
Operating revenue									0	0	0
Office Building [Member] | North America [Member] | Operating Segments [Member] | Florida [Member]
Revenue from External Customer [Line Items]
Operating revenue									33,705	60,035	72,514
Office Building [Member] | North America [Member] | Operating Segments [Member] | Houston [Member]
Revenue from External Customer [Line Items]
Operating revenue									1,212	229	0
Office Building [Member] | North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									2,280	2,305	2,324
Office Building [Member] | North America [Member] | Operating Segments [Member] | Minnesota [Member]
Revenue from External Customer [Line Items]
Operating revenue									19,021	23,211	29,514
Office Building [Member] | North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Revenue from External Customer [Line Items]
Operating revenue									28,996	28,681	25,166
Office Building [Member] | North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Revenue from External Customer [Line Items]
Operating revenue									72,208	119,255	119,819
Office Building [Member] | North America [Member] | Operating Segments [Member] | Other Segments [Member]
Revenue from External Customer [Line Items]
Operating revenue									44,759	47,165	47,341
Office Building [Member] | United Kingdom [Member] | Operating Segments [Member] | United Kingdom [Member]
Revenue from External Customer [Line Items]
Operating revenue									$ 2,601	$ 3,031	$ 3,270

Segment Information (Total Asse

Segment Information (Total Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 5,992,813	$ 6,557,629
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	5,889,764	6,493,176
Operating Segments [Member] | Carolinas Richmond [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	503,920	467,098
Operating Segments [Member] | Chicago Milwaukee [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	423,889	429,390
Operating Segments [Member] | Florida [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	514,431	874,352
Operating Segments [Member] | Houston [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	530,438	522,285
Operating Segments [Member] | Lehigh Central PA [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	1,311,815	1,157,468
Operating Segments [Member] | Minnesota [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	192,409	346,840
Operating Segments [Member] | Philadelphia [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	557,510	444,889
Operating Segments [Member] | Southeastern PA [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	262,155	448,523
Operating Segments [Member] | United Kingdom [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Assets	189,766	215,850
Operating Segments [Member] | Other Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Assets	1,403,431	1,586,481
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Assets	$ 103,049	$ 64,453

Segment Information (Real Estat

Segment Information (Real Estate Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Real estate assets	$ 5,260,295	$ 5,865,562
North America [Member] | Operating Segments [Member] | Carolinas Richmond [Member]
Segment Reporting Information [Line Items]
Real estate assets	482,736	446,348
North America [Member] | Operating Segments [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Real estate assets	382,325	387,182
North America [Member] | Operating Segments [Member] | Florida [Member]
Segment Reporting Information [Line Items]
Real estate assets	476,046	815,712
North America [Member] | Operating Segments [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Real estate assets	495,817	483,432
North America [Member] | Operating Segments [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Real estate assets	1,234,090	1,096,195
North America [Member] | Operating Segments [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Real estate assets	182,737	322,627
North America [Member] | Operating Segments [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Real estate assets	332,933	282,159
North America [Member] | Operating Segments [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Real estate assets	236,317	410,195
North America [Member] | Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Real estate assets	1,288,212	1,447,322
United Kingdom [Member] | Operating Segments [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Real estate assets	$ 149,082	$ 174,390

Segment Information (Costs Incu

Segment Information (Costs Incurred on Long-lived Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	$ 511,093	$ 573,052	$ 615,487
Operating Segments [Member] | North America [Member] | Carolinas Richmond [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	51,647	31,175	82,600
Operating Segments [Member] | North America [Member] | Chicago Milwaukee [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	18,294	13,483	21,698
Operating Segments [Member] | North America [Member] | Florida [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	38,312	43,594	45,152
Operating Segments [Member] | North America [Member] | Houston [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	25,638	96,681	70,903
Operating Segments [Member] | North America [Member] | Lehigh Central PA [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	176,386	165,319	105,725
Operating Segments [Member] | North America [Member] | Minnesota [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	11,023	41,259	28,966
Operating Segments [Member] | North America [Member] | Philadelphia [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	57,691	34,122	32,012
Operating Segments [Member] | North America [Member] | Southeastern PA [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	13,110	9,047	39,638
Operating Segments [Member] | North America [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	107,500	125,412	172,495
Operating Segments [Member] | United Kingdom [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Cost incurred on long-lived assets	$ 11,492	$ 12,960	$ 16,298

Accounting for the Impairmen110

Accounting for the Impairment or Disposal of Long-Lived Assets (Discontinued Operations) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Jan. 31, 2014USD ($)aft²properties	Dec. 31, 2013USD ($)aft²propertiessettlement	Nov. 30, 2013USD ($)aft²properties
Discontinued Operation
Gain on property dispositions			$ 46,631
Net income	$ 0	$ 0	48,581
Discontinued Operations [Member]
Discontinued Operation
Revenues			4,728
Operating expenses			(2,258)
Interest and other income			37
Interest expense			(557)
Depreciation and amortization			0
Income before property dispositions			1,950
Gain on property dispositions			46,631
Net income			$ 48,581
Building and Building Improvements [Member] | Maryland [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet | ft²				1,400
Building and Building Improvements [Member] | New Jersey [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | properties				24
Building and Building Improvements [Member] | Southeastern PA [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet | ft²				37
Land and Land Improvements [Member] | Maryland [Member] | Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land | a				19
Portfolio Sale, Total [Member] | Building and Building Improvements [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | properties						97
Leaseable square feet | ft²						6,600
Portfolio Sale, Total [Member] | Land and Land Improvements [Member] | Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land | a						159
Portfolio Sale, Total [Member] | Land, Buildings and Improvements [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds						$ 697,300
Portfolio Sale, first settlement [Member] | Building and Building Improvements [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | properties					49
Leaseable square feet | ft²					4,000
Portfolio Sale, first settlement [Member] | Land and Land Improvements [Member] | Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land | a					140
Portfolio Sale, first settlement [Member] | Land, Buildings and Improvements [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds					$ 367,700
Number of real estate settlements | settlement					2
Portfolio Sale, Second Settlement [Member] | Building and Building Improvements [Member] | Maryland [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | properties				23
Portfolio Sale, Second Settlement [Member] | Building and Building Improvements [Member] | New Jersey [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet | ft²				1,200
Portfolio Sale, Second Settlement [Member] | Building and Building Improvements [Member] | Southeastern PA [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | properties				1
Portfolio Sale, Second Settlement [Member] | Land, Buildings and Improvements [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds				$ 329,600

Accounting for the Impairmen111

Accounting for the Impairment or Disposal of Long-Lived Assets (Significant Sale) (Details) $ in Thousands, ft² in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 31, 2016USD ($)aft²properties	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Real Estate [Line Items]
Net income		$ 200,291	$ 55,734	$ 51,057	$ 59,063	$ 83,841	$ 93,695	$ 36,526	$ 31,862	$ 366,145	$ 245,924	$ 224,471
Noncontrolling interest – operating partnership										(9,070)	(6,192)	(5,713)
Income available to common shareholders										356,817	239,483	218,211
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Real Estate Portfolio [Member]
Real Estate [Line Items]
Number of properties | properties	108
Leaseable square feet | ft²	7.6
Area of land | a	26.7
Proceeds from sale of land	$ 969,000
Gains on sale of land	$ 179,100
Net income										48,609	58,792	51,898
Noncontrolling interest – operating partnership										(1,142)	(1,370)	(1,220)
Income available to common shareholders										$ 47,467	$ 57,422	$ 50,678

Accounting for the Impairmen112

Accounting for the Impairment or Disposal of Long-Lived Assets (Assets Held for Sale) (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations [Member] - Florida [Member] - Land [Member]	Dec. 31, 2016aparcel
Long Lived Assets Held-for-sale [Line Items]
Number of properties | parcel	2
Area of land | a	12.5

Accounting for the Impairmen113

Accounting for the Impairment or Disposal of Long-Lived Assets (Asset Impairments in Reportable Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Asset impairment charges	$ 3,879	$ 18,244	$ 117
Carolinas Richmond [Member]
Segment Reporting Information [Line Items]
Asset impairment charges	0	13,755	0
Minnesota [Member]
Segment Reporting Information [Line Items]
Asset impairment charges	3,879	0	0
Southeastern PA [Member]
Segment Reporting Information [Line Items]
Asset impairment charges	0	2,328	106
Other Segments [Member]
Segment Reporting Information [Line Items]
Asset impairment charges	$ 0	$ 2,161	$ 11

Derivative Instruments (Details

Derivative Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Interest Rate Derivatives
Number of interest rate swaps | contract	3
Aggregate notional amount	$ 98,900	$ 101,400
Termination value of interest rate swap, including accrued interest	4,900
Interest Rate Cash Flow Hedges
Fair value of swaps in other liabilities	4,900	7,100
Amount to be reclassified from accumulated other comprehensive income to increase interest expense over next twelve months	600
Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest Rate Cash Flow Hedges
Amount of loss related to the effective portion recognized in other comprehensive (loss) income	(648)	(1,884)	$ (3,400)
Interest Rate Swap [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest Rate Cash Flow Hedges
Amount of loss related to the effective portion reclassified to interest expense	(1,069)	(1,396)	(1,500)
Amount of loss related to the ineffective portion recognized in interest expense	$ (48)	$ (91)	$ (82)

Supplemental Disclosure to S115

Supplemental Disclosure to Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Disclosure to Statements of Cash Flows [Abstract]
Write-off of fully depreciated/amortized property and deferred costs	$ 41,406	$ 42,339	$ 38,131
Write-off of depreciated property and deferred costs due to sale/demolition	461,480	252,017	173,083
Write-off of costs related to early debt extinguishment	219	0	0
Increase in investments in and advances to unconsolidated joint ventures due to disposition/development activity	0	0	(11,948)
Changes in accrued development capital expenditures	(11,368)	11,964	6,264
Unrealized gain (loss) on cash flow hedge	410	(488)	(3,419)
Capitalized equity-based compensation	1,221	876	1,045
Redemption of noncontrolling interests - common units	$ 132	$ 0	$ 0

Schedule II (Details)

Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	$ 6,898	$ 7,400	$ 7,761
Additions	5,774	5,479	4,983
Deductions	(5,340)	(5,981)	(5,344)
Balance at End of the Year	7,332	6,898	7,400
Allowance for Trade Receivable, Straight Line Rent [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	581	910	823
Additions	824	1,233	1,097
Deductions	(875)	(1,562)	(1,010)
Balance at End of the Year	530	581	910
Allowance for Trade Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of the Year	6,317	6,490	6,938
Additions	4,950	4,246	3,886
Deductions	(4,465)	(4,419)	(4,334)
Balance at End of the Year	$ 6,802	$ 6,317	$ 6,490

Schedule III (Details)

Schedule III (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Gross Amount Carried at End of Period	$ 7,014,490,000	$ 7,074,558,000	$ 6,704,262,000	$ 6,200,410,000
Accumulated Depreciation	$ 1,148,928,000	1,182,129,000	1,051,340,000	940,115,000
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,014,490,000	7,074,558,000	6,704,262,000
Real Estate Additions	472,282,000	562,299,000	602,585,000
Real Estate, Cost of Real Estate Sold	(1,286,362,000)	(622,367,000)	(232,289,000)
Real Estate, Gross	6,200,410,000	7,014,490,000	7,074,558,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,148,928,000	1,182,129,000	1,051,340,000
Real Estate Accumulated Depreciation, Depreciation Expense	168,077,000	182,011,000	179,143,000
Real Estate Accumulated Depreciation, Real Estate Sold	(376,890,000)	(215,212,000)	(48,354,000)
Real Estate Accumulated Depreciation	940,115,000	$ 1,148,928,000	$ 1,182,129,000
Allianz, John Hancock, LaSalle Bank, Athene, New York Life and Wells Fargo [Member] [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances				218,800,000
Total Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances				51,071,036
Initial Cost of Land				1,353,356,385
Initial Cost of Buildings				2,250,324,535
Costs Capitalized Subsequent to Acquisition				2,596,728,236
Land and Improvements				1,431,038,704
Building and Improvements				4,769,370,452
Gross Amount Carried at End of Period	6,200,409,156			6,200,409,156
Accumulated Depreciation	940,114,836			940,114,836
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	6,200,409,156
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 940,114,836
Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Morrisville, NC
Encumbrances				0
Initial Cost of Land				1,061,370
Initial Cost of Buildings				5,152,110
Costs Capitalized Subsequent to Acquisition				526,179
Land and Improvements				1,061,632
Building and Improvements				5,678,027
Gross Amount Carried at End of Period	$ 6,739,659			6,739,659
Accumulated Depreciation	$ 1,586,152			1,586,152
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,739,659
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,586,152
Operating Properties [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Aberdeen, MD
Encumbrances				0
Initial Cost of Land				12,052,635
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				35,350,875
Land and Improvements				12,334,030
Building and Improvements				35,069,480
Gross Amount Carried at End of Period	$ 47,403,510			47,403,510
Accumulated Depreciation	$ 2,319,303			2,319,303
Date of Construction or Acquisition	1,984
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 47,403,510
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,319,303
Operating Properties [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Aberdeen, MD
Encumbrances				0
Initial Cost of Land				5,813,324
Initial Cost of Buildings				18,874,059
Costs Capitalized Subsequent to Acquisition				6,232,539
Land and Improvements				5,816,839
Building and Improvements				25,103,083
Gross Amount Carried at End of Period	$ 30,919,922			30,919,922
Accumulated Depreciation	$ 6,723,493			6,723,493
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 30,919,922
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,723,493
Operating Properties [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Addison, IL
Encumbrances				0
Initial Cost of Land				1,194,223
Initial Cost of Buildings				4,201,881
Costs Capitalized Subsequent to Acquisition				77,652
Land and Improvements				1,194,223
Building and Improvements				4,279,534
Gross Amount Carried at End of Period	$ 5,473,757			5,473,757
Accumulated Depreciation	$ 424,062			424,062
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,473,757
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 424,062
Operating Properties [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Addison, IL
Encumbrances				0
Initial Cost of Land				2,055,066
Initial Cost of Buildings				5,984,093
Costs Capitalized Subsequent to Acquisition				863,926
Land and Improvements				2,055,066
Building and Improvements				6,848,019
Gross Amount Carried at End of Period	$ 8,903,085			8,903,085
Accumulated Depreciation	$ 691,088			691,088
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,903,085
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 691,088
Operating Properties [Member] | 8620 Congdon Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Alburtis, PA
Encumbrances				0
Initial Cost of Land				38,328,000
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				36,272,373
Land and Improvements				38,328,000
Building and Improvements				36,272,373
Gross Amount Carried at End of Period	$ 74,600,373			74,600,373
Accumulated Depreciation	$ 176,452			176,452
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 74,600,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 176,452
Operating Properties [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				4,722,683
Initial Cost of Buildings				18,922,645
Costs Capitalized Subsequent to Acquisition				942,589
Land and Improvements				4,722,683
Building and Improvements				19,865,234
Gross Amount Carried at End of Period	$ 24,587,917			24,587,917
Accumulated Depreciation	$ 6,156,414			6,156,414
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 24,587,917
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,156,414
Operating Properties [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				3,599,936
Initial Cost of Buildings				12,099,145
Costs Capitalized Subsequent to Acquisition				2,149,322
Land and Improvements				3,717,733
Building and Improvements				14,130,670
Gross Amount Carried at End of Period	$ 17,848,403			17,848,403
Accumulated Depreciation	$ 5,107,522			5,107,522
Date of Construction or Acquisition	2,000
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	$ 5,107,522
Operating Properties [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				8,065,500
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				27,983,513
Land and Improvements				8,184,096
Building and Improvements				27,864,917
Gross Amount Carried at End of Period	$ 36,049,013			36,049,013
Accumulated Depreciation	$ 14,944,604			14,944,604
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 36,049,013
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 14,944,604
Operating Properties [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				5,208,248
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				32,429,833
Land and Improvements				9,961,788
Building and Improvements				27,676,293
Gross Amount Carried at End of Period	$ 37,638,081			37,638,081
Accumulated Depreciation	$ 9,833,900			9,833,900
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 37,638,081
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 9,833,900
Operating Properties [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				4,308,646
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				17,844,894
Land and Improvements				4,308,646
Building and Improvements				17,844,894
Gross Amount Carried at End of Period	$ 22,153,540			22,153,540
Accumulated Depreciation	$ 8,892,782			8,892,782
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,153,540
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,892,782
Operating Properties [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				3,473,120
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				20,222,715
Land and Improvements				4,174,970
Building and Improvements				19,520,865
Gross Amount Carried at End of Period	$ 23,695,835			23,695,835
Accumulated Depreciation	$ 10,529,674			10,529,674
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 23,695,835
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 10,529,674
Operating Properties [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				10,594,027
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				28,813,401
Land and Improvements				10,596,767
Building and Improvements				28,810,661
Gross Amount Carried at End of Period	$ 39,407,428			39,407,428
Accumulated Depreciation	$ 14,298,681			14,298,681
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 39,407,428
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 14,298,681
Operating Properties [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				792,999
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,644,609
Land and Improvements				804,848
Building and Improvements				4,632,760
Gross Amount Carried at End of Period	$ 5,437,608			5,437,608
Accumulated Depreciation	$ 2,031,336			2,031,336
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,437,608
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,031,336
Operating Properties [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				2,670,849
Initial Cost of Buildings				13,307,408
Costs Capitalized Subsequent to Acquisition				4,759,556
Land and Improvements				2,670,673
Building and Improvements				18,067,140
Gross Amount Carried at End of Period	$ 20,737,813			20,737,813
Accumulated Depreciation	$ 9,018,935			9,018,935
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,737,813
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 9,018,935
Operating Properties [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				1,187,776
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,592,257
Land and Improvements				1,197,447
Building and Improvements				7,582,586
Gross Amount Carried at End of Period	$ 8,780,033			8,780,033
Accumulated Depreciation	$ 3,913,214			3,913,214
Date of Construction or Acquisition	2,013
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	$ 3,913,214
Operating Properties [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				717,488
Initial Cost of Buildings				5,022,413
Costs Capitalized Subsequent to Acquisition				3,449,601
Land and Improvements				726,651
Building and Improvements				8,462,850
Gross Amount Carried at End of Period	$ 9,189,501			9,189,501
Accumulated Depreciation	$ 5,213,645			5,213,645
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,189,501
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,213,645
Operating Properties [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				4,019,258
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,000,352
Land and Improvements				3,645,117
Building and Improvements				10,374,493
Gross Amount Carried at End of Period	$ 14,019,610			14,019,610
Accumulated Depreciation	$ 5,143,974			5,143,974
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,019,610
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,143,974
Operating Properties [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				2,564,167
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,479,952
Land and Improvements				2,571,466
Building and Improvements				9,472,653
Gross Amount Carried at End of Period	$ 12,044,119			12,044,119
Accumulated Depreciation	$ 3,528,379			3,528,379
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,044,119
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,528,379
Operating Properties [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				1,025,667
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,066,872
Land and Improvements				1,035,854
Building and Improvements				5,056,685
Gross Amount Carried at End of Period	$ 6,092,539			6,092,539
Accumulated Depreciation	$ 1,799,894			1,799,894
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,092,539
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,799,894
Operating Properties [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				6,725,948
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				27,402,564
Land and Improvements				7,521,211
Building and Improvements				26,607,301
Gross Amount Carried at End of Period	$ 34,128,512			34,128,512
Accumulated Depreciation	$ 7,412,738			7,412,738
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 34,128,512
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 7,412,738
Operating Properties [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				531,268
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,074,622
Land and Improvements				532,047
Building and Improvements				6,073,843
Gross Amount Carried at End of Period	$ 6,605,890			6,605,890
Accumulated Depreciation	$ 3,836,591			3,836,591
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,605,890
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,836,591
Operating Properties [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				360,027
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,526,060
Land and Improvements				560,691
Building and Improvements				4,325,396
Gross Amount Carried at End of Period	$ 4,886,087			4,886,087
Accumulated Depreciation	$ 2,458,586			2,458,586
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,886,087
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,458,586
Operating Properties [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				540,795
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,121,035
Land and Improvements				541,459
Building and Improvements				4,120,371
Gross Amount Carried at End of Period	$ 4,661,830			4,661,830
Accumulated Depreciation	$ 2,427,731			2,427,731
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,661,830
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,427,731
Operating Properties [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				707,203
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,138,461
Land and Improvements				707,867
Building and Improvements				3,137,797
Gross Amount Carried at End of Period	$ 3,845,664			3,845,664
Accumulated Depreciation	$ 1,903,126			1,903,126
Date of Construction or Acquisition	1,995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,845,664
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,903,126
Operating Properties [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				453,315
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,873,771
Land and Improvements				484,361
Building and Improvements				1,842,725
Gross Amount Carried at End of Period	$ 2,327,086			2,327,086
Accumulated Depreciation	$ 1,050,115			1,050,115
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,327,086
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,050,115
Operating Properties [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				422,042
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,271,389
Land and Improvements				422,730
Building and Improvements				5,270,701
Gross Amount Carried at End of Period	$ 5,693,431			5,693,431
Accumulated Depreciation	$ 2,904,488			2,904,488
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,693,431
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,904,488
Operating Properties [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				458,281
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,812,638
Land and Improvements				458,945
Building and Improvements				3,811,974
Gross Amount Carried at End of Period	$ 4,270,919			4,270,919
Accumulated Depreciation	$ 2,117,790			2,117,790
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,270,919
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,117,790
Operating Properties [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				388,328
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,876,767
Land and Improvements				389,081
Building and Improvements				4,876,014
Gross Amount Carried at End of Period	$ 5,265,095			5,265,095
Accumulated Depreciation	$ 3,025,010			3,025,010
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,265,095
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,025,010
Operating Properties [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				1,091,806
Initial Cost of Buildings				3,851,456
Costs Capitalized Subsequent to Acquisition				445,980
Land and Improvements				1,093,724
Building and Improvements				4,295,518
Gross Amount Carried at End of Period	$ 5,389,242			5,389,242
Accumulated Depreciation	$ 2,265,098			2,265,098
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,389,242
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,265,098
Operating Properties [Member] | 700 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				26,311,300
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				75,988,219
Land and Improvements				30,712,602
Building and Improvements				71,586,917
Gross Amount Carried at End of Period	$ 102,299,519			102,299,519
Accumulated Depreciation	$ 519,191			519,191
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 102,299,519
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 519,191
Operating Properties [Member] | 11222 Melrose Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Franklin Park, IL
Encumbrances				0
Initial Cost of Land				2,999,106
Initial Cost of Buildings				4,658,605
Costs Capitalized Subsequent to Acquisition				153,158
Land and Improvements				2,999,106
Building and Improvements				4,811,763
Gross Amount Carried at End of Period	$ 7,810,869			7,810,869
Accumulated Depreciation	$ 127,245			127,245
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,810,869
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 127,245
Operating Properties [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Atlanta, GA
Encumbrances				0
Initial Cost of Land				200,351
Initial Cost of Buildings				1,729,161
Costs Capitalized Subsequent to Acquisition				244,810
Land and Improvements				200,351
Building and Improvements				1,973,971
Gross Amount Carried at End of Period	$ 2,174,322			2,174,322
Accumulated Depreciation	$ 244,124			244,124
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,174,322
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 244,124
Operating Properties [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Atlanta, GA
Encumbrances				0
Initial Cost of Land				188,680
Initial Cost of Buildings				1,721,048
Costs Capitalized Subsequent to Acquisition				166,204
Land and Improvements				188,680
Building and Improvements				1,887,252
Gross Amount Carried at End of Period	$ 2,075,932			2,075,932
Accumulated Depreciation	$ 203,086			203,086
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,075,932
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 203,086
Operating Properties [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Atlanta, GA
Encumbrances				0
Initial Cost of Land				919,850
Initial Cost of Buildings				4,051,340
Costs Capitalized Subsequent to Acquisition				937,692
Land and Improvements				919,850
Building and Improvements				4,989,032
Gross Amount Carried at End of Period	$ 5,908,882			5,908,882
Accumulated Depreciation	$ 646,951			646,951
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,908,882
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 646,951
Operating Properties [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Barton Under Needwood, UK
Encumbrances				0
Initial Cost of Land				2,196,955
Initial Cost of Buildings				13,643,981
Costs Capitalized Subsequent to Acquisition				(4,029,838)
Land and Improvements				1,638,063
Building and Improvements				10,173,035
Gross Amount Carried at End of Period	$ 11,811,098			11,811,098
Accumulated Depreciation	$ 995,308			995,308
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,811,098
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 995,308
Operating Properties [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Batavia, IL
Encumbrances				0
Initial Cost of Land				727,294
Initial Cost of Buildings				2,367,529
Costs Capitalized Subsequent to Acquisition				686,568
Land and Improvements				727,294
Building and Improvements				3,054,097
Gross Amount Carried at End of Period	$ 3,781,391			3,781,391
Accumulated Depreciation	$ 366,744			366,744
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,781,391
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 366,744
Operating Properties [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Belcamp, MD
Encumbrances				0
Initial Cost of Land				299,600
Initial Cost of Buildings				1,818,861
Costs Capitalized Subsequent to Acquisition				712,788
Land and Improvements				299,600
Building and Improvements				2,531,649
Gross Amount Carried at End of Period	$ 2,831,249			2,831,249
Accumulated Depreciation	$ 1,104,502			1,104,502
Date of Construction or Acquisition	2,013
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	$ 1,104,502
Operating Properties [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				2,769,962
Initial Cost of Buildings				1,829,028
Costs Capitalized Subsequent to Acquisition				278,794
Land and Improvements				2,663,725
Building and Improvements				2,214,060
Gross Amount Carried at End of Period	$ 4,877,785			4,877,785
Accumulated Depreciation	$ 313,325			313,325
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,877,785
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 313,325
Operating Properties [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				3,595,044
Initial Cost of Buildings				2,415,132
Costs Capitalized Subsequent to Acquisition				145,949
Land and Improvements				3,457,162
Building and Improvements				2,698,963
Gross Amount Carried at End of Period	$ 6,156,125			6,156,125
Accumulated Depreciation	$ 477,203			477,203
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,156,125
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 477,203
Operating Properties [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				3,492,036
Initial Cost of Buildings				2,024,038
Costs Capitalized Subsequent to Acquisition				366,205
Land and Improvements				3,358,104
Building and Improvements				2,524,175
Gross Amount Carried at End of Period	$ 5,882,279			5,882,279
Accumulated Depreciation	$ 524,742			524,742
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,882,279
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 524,742
Operating Properties [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				2,021,752
Initial Cost of Buildings				2,503,802
Costs Capitalized Subsequent to Acquisition				397,174
Land and Improvements				2,021,752
Building and Improvements				2,900,976
Gross Amount Carried at End of Period	$ 4,922,728			4,922,728
Accumulated Depreciation	$ 581,288			581,288
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,922,728
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 581,288
Operating Properties [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				1,347,882
Initial Cost of Buildings				1,460,291
Costs Capitalized Subsequent to Acquisition				614,057
Land and Improvements				1,347,882
Building and Improvements				2,074,348
Gross Amount Carried at End of Period	$ 3,422,230			3,422,230
Accumulated Depreciation	$ 266,439			266,439
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,422,230
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 266,439
Operating Properties [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Beltsville,MD
Encumbrances				0
Initial Cost of Land				1,479,307
Initial Cost of Buildings				2,159,997
Costs Capitalized Subsequent to Acquisition				781,160
Land and Improvements				1,479,307
Building and Improvements				2,941,158
Gross Amount Carried at End of Period	$ 4,420,465			4,420,465
Accumulated Depreciation	$ 343,319			343,319
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,420,465
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 343,319
Operating Properties [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bensenville,IL
Encumbrances				0
Initial Cost of Land				2,173,006
Initial Cost of Buildings				2,280,788
Costs Capitalized Subsequent to Acquisition				279,776
Land and Improvements				2,016,715
Building and Improvements				2,716,855
Gross Amount Carried at End of Period	$ 4,733,570			4,733,570
Accumulated Depreciation	$ 362,273			362,273
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,733,570
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 362,273
Operating Properties [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bensenville,IL
Encumbrances				0
Initial Cost of Land				2,298,560
Initial Cost of Buildings				4,020,382
Costs Capitalized Subsequent to Acquisition				360,126
Land and Improvements				2,298,560
Building and Improvements				4,380,508
Gross Amount Carried at End of Period	$ 6,679,068			6,679,068
Accumulated Depreciation	$ 578,737			578,737
Date of Construction or Acquisition	2,008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,679,068
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 578,737
Operating Properties [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bensenville,IL
Encumbrances				0
Initial Cost of Land				1,903,423
Initial Cost of Buildings				3,563,953
Costs Capitalized Subsequent to Acquisition				264,360
Land and Improvements				1,903,423
Building and Improvements				3,828,313
Gross Amount Carried at End of Period	$ 5,731,736			5,731,736
Accumulated Depreciation	$ 478,694			478,694
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,731,736
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 478,694
Operating Properties [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bensenville,IL
Encumbrances				0
Initial Cost of Land				2,958,756
Initial Cost of Buildings				7,959,013
Costs Capitalized Subsequent to Acquisition				780,065
Land and Improvements				2,958,756
Building and Improvements				8,739,078
Gross Amount Carried at End of Period	$ 11,697,834			11,697,834
Accumulated Depreciation	$ 1,049,558			1,049,558
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,697,834
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,049,558
Operating Properties [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bethlehem, PA
Encumbrances				0
Initial Cost of Land				5,591,216
Initial Cost of Buildings				32,941,818
Costs Capitalized Subsequent to Acquisition				7,265,580
Land and Improvements				8,947,574
Building and Improvements				36,851,040
Gross Amount Carried at End of Period	$ 45,798,614			45,798,614
Accumulated Depreciation	$ 2,929,841			2,929,841
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 45,798,614
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,929,841
Operating Properties [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bethlehem, PA
Encumbrances				0
Initial Cost of Land				11,961,623
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				46,707,077
Land and Improvements				12,009,985
Building and Improvements				46,658,715
Gross Amount Carried at End of Period	$ 58,668,700			58,668,700
Accumulated Depreciation	$ 4,358,917			4,358,917
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 58,668,700
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,358,917
Operating Properties [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bolingbrook, IL
Encumbrances				0
Initial Cost of Land				2,501,294
Initial Cost of Buildings				10,704,719
Costs Capitalized Subsequent to Acquisition				1,170
Land and Improvements				2,501,294
Building and Improvements				10,705,889
Gross Amount Carried at End of Period	$ 13,207,183			13,207,183
Accumulated Depreciation	$ 1,169,697			1,169,697
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,207,183
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,169,697
Operating Properties [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bolingbrook, IL
Encumbrances				0
Initial Cost of Land				3,078,949
Initial Cost of Buildings				14,143,377
Costs Capitalized Subsequent to Acquisition				1,124,578
Land and Improvements				3,078,949
Building and Improvements				15,267,955
Gross Amount Carried at End of Period	$ 18,346,904			18,346,904
Accumulated Depreciation	$ 1,712,589			1,712,589
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 18,346,904
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,712,589
Operating Properties [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bolingbrook, IL
Encumbrances				0
Initial Cost of Land				3,764,831
Initial Cost of Buildings				15,109,947
Costs Capitalized Subsequent to Acquisition				1,469,069
Land and Improvements				3,764,831
Building and Improvements				16,579,016
Gross Amount Carried at End of Period	$ 20,343,847			20,343,847
Accumulated Depreciation	$ 2,205,965			2,205,965
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,343,847
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,205,965
Operating Properties [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Breinigsville, PA
Encumbrances				0
Initial Cost of Land				2,859,106
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,599,615
Land and Improvements				2,865,575
Building and Improvements				10,593,146
Gross Amount Carried at End of Period	$ 13,458,721			13,458,721
Accumulated Depreciation	$ 3,358,912			3,358,912
Date of Construction or Acquisition	2,013
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	$ 3,358,912
Operating Properties [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Breinigsville, PA
Encumbrances				0
Initial Cost of Land				2,089,719
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,353,910
Land and Improvements				2,222,168
Building and Improvements				8,221,461
Gross Amount Carried at End of Period	$ 10,443,629			10,443,629
Accumulated Depreciation	$ 2,235,927			2,235,927
Date of Construction or Acquisition	2,013
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	$ 2,235,927
Operating Properties [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Breinigsville, PA
Encumbrances				0
Initial Cost of Land				8,752,708
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				40,133,665
Land and Improvements				11,511,499
Building and Improvements				37,374,874
Gross Amount Carried at End of Period	$ 48,886,373			48,886,373
Accumulated Depreciation	$ 10,316,766			10,316,766
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 48,886,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 10,316,766
Operating Properties [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Breinigsville, PA
Encumbrances				0
Initial Cost of Land				8,118,881
Initial Cost of Buildings				18,885,486
Costs Capitalized Subsequent to Acquisition				7,520,945
Land and Improvements				8,118,881
Building and Improvements				26,406,431
Gross Amount Carried at End of Period	$ 34,525,312			34,525,312
Accumulated Depreciation	$ 9,758,985			9,758,985
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 34,525,312
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 9,758,985
Operating Properties [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carlisle, PA
Encumbrances				0
Initial Cost of Land				4,249,868
Initial Cost of Buildings				13,886,039
Costs Capitalized Subsequent to Acquisition				2,344,063
Land and Improvements				4,095,262
Building and Improvements				16,384,708
Gross Amount Carried at End of Period	$ 20,479,970			20,479,970
Accumulated Depreciation	$ 6,463,352			6,463,352
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,479,970
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,463,352
Operating Properties [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carlisle, PA
Encumbrances				0
Initial Cost of Land				7,981,850
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				33,016,988
Land and Improvements				8,081,272
Building and Improvements				32,917,566
Gross Amount Carried at End of Period	$ 40,998,838			40,998,838
Accumulated Depreciation	$ 4,140,856			4,140,856
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 40,998,838
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,140,856
Operating Properties [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carol Stream, IL
Encumbrances				0
Initial Cost of Land				4,873,094
Initial Cost of Buildings				12,430,320
Costs Capitalized Subsequent to Acquisition				2,229,287
Land and Improvements				4,873,094
Building and Improvements				14,659,607
Gross Amount Carried at End of Period	$ 19,532,701			19,532,701
Accumulated Depreciation	$ 1,144,752			1,144,752
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,532,701
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,144,752
Operating Properties [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carol Stream, IL
Encumbrances				0
Initial Cost of Land				5,523,427
Initial Cost of Buildings				14,581,705
Costs Capitalized Subsequent to Acquisition				1,016,882
Land and Improvements				5,523,427
Building and Improvements				15,598,587
Gross Amount Carried at End of Period	$ 21,122,014			21,122,014
Accumulated Depreciation	$ 1,366,471			1,366,471
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 21,122,014
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,366,471
Operating Properties [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carrollton, TX
Encumbrances				0
Initial Cost of Land				247,477
Initial Cost of Buildings				2,028,322
Costs Capitalized Subsequent to Acquisition				83,523
Land and Improvements				247,477
Building and Improvements				2,111,845
Gross Amount Carried at End of Period	$ 2,359,322			2,359,322
Accumulated Depreciation	$ 256,594			256,594
Date of Construction or Acquisition	2,005
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	$ 256,594
Operating Properties [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Carrollton, TX
Encumbrances				0
Initial Cost of Land				1,042,453
Initial Cost of Buildings				8,027,974
Costs Capitalized Subsequent to Acquisition				424,957
Land and Improvements				1,042,453
Building and Improvements				8,452,931
Gross Amount Carried at End of Period	$ 9,495,384			9,495,384
Accumulated Depreciation	$ 917,970			917,970
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,495,384
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 917,970
Operating Properties [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Chambersburg, PA
Encumbrances				0
Initial Cost of Land				7,081,007
Initial Cost of Buildings				39,002,011
Costs Capitalized Subsequent to Acquisition				2,091,556
Land and Improvements				7,081,007
Building and Improvements				41,093,567
Gross Amount Carried at End of Period	$ 48,174,574			48,174,574
Accumulated Depreciation	$ 4,663,680			4,663,680
Date of Construction or Acquisition	2,001
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	$ 4,663,680
Operating Properties [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Chambersburg, PA
Encumbrances				0
Initial Cost of Land				8,695,501
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				35,058,041
Land and Improvements				9,407,871
Building and Improvements				34,345,671
Gross Amount Carried at End of Period	$ 43,753,542			43,753,542
Accumulated Depreciation	$ 8,074,404			8,074,404
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 43,753,542
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,074,404
Operating Properties [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Champlin, MN
Encumbrances				0
Initial Cost of Land				1,251,043
Initial Cost of Buildings				11,662,995
Costs Capitalized Subsequent to Acquisition				119,919
Land and Improvements				1,251,043
Building and Improvements				11,782,914
Gross Amount Carried at End of Period	$ 13,033,957			13,033,957
Accumulated Depreciation	$ 1,803,401			1,803,401
Date of Construction or Acquisition	1,995
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	$ 1,803,401
Operating Properties [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				2,054,621
Initial Cost of Buildings				6,356,151
Costs Capitalized Subsequent to Acquisition				847,042
Land and Improvements				2,054,621
Building and Improvements				7,203,192
Gross Amount Carried at End of Period	$ 9,257,813			9,257,813
Accumulated Depreciation	$ 1,429,290			1,429,290
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,257,813
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,429,290
Operating Properties [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				475,368
Initial Cost of Buildings				2,367,586
Costs Capitalized Subsequent to Acquisition				803,884
Land and Improvements				476,262
Building and Improvements				3,170,575
Gross Amount Carried at End of Period	$ 3,646,837			3,646,837
Accumulated Depreciation	$ 469,072			469,072
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,646,837
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 469,072
Operating Properties [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				912,500
Initial Cost of Buildings				4,721,259
Costs Capitalized Subsequent to Acquisition				322,907
Land and Improvements				912,500
Building and Improvements				5,044,166
Gross Amount Carried at End of Period	$ 5,956,666			5,956,666
Accumulated Depreciation	$ 771,151			771,151
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,956,666
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 771,151
Operating Properties [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,275,000
Initial Cost of Buildings				4,649,750
Costs Capitalized Subsequent to Acquisition				630,260
Land and Improvements				1,275,000
Building and Improvements				5,280,010
Gross Amount Carried at End of Period	$ 6,555,010			6,555,010
Accumulated Depreciation	$ 846,716			846,716
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,555,010
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 846,716
Operating Properties [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,878,750
Initial Cost of Buildings				10,129,499
Costs Capitalized Subsequent to Acquisition				32,484
Land and Improvements				1,878,750
Building and Improvements				10,161,983
Gross Amount Carried at End of Period	$ 12,040,733			12,040,733
Accumulated Depreciation	$ 1,440,018			1,440,018
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,040,733
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,440,018
Operating Properties [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,065,000
Initial Cost of Buildings				6,975,250
Costs Capitalized Subsequent to Acquisition				605,167
Land and Improvements				1,065,000
Building and Improvements				7,580,417
Gross Amount Carried at End of Period	$ 8,645,417			8,645,417
Accumulated Depreciation	$ 1,104,601			1,104,601
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,645,417
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,104,601
Operating Properties [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,831,250
Initial Cost of Buildings				10,779,412
Costs Capitalized Subsequent to Acquisition				1,100,142
Land and Improvements				1,831,250
Building and Improvements				11,879,554
Gross Amount Carried at End of Period	$ 13,710,804			13,710,804
Accumulated Depreciation	$ 1,710,855			1,710,855
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,710,804
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,710,855
Operating Properties [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,990,000
Initial Cost of Buildings				6,561,540
Costs Capitalized Subsequent to Acquisition				1,171,719
Land and Improvements				1,990,000
Building and Improvements				7,733,259
Gross Amount Carried at End of Period	$ 9,723,259			9,723,259
Accumulated Depreciation	$ 1,040,722			1,040,722
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,723,259
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,040,722
Operating Properties [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,418,928
Initial Cost of Buildings				7,511,050
Costs Capitalized Subsequent to Acquisition				183,383
Land and Improvements				1,418,928
Building and Improvements				7,694,433
Gross Amount Carried at End of Period	$ 9,113,361			9,113,361
Accumulated Depreciation	$ 1,198,063			1,198,063
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,113,361
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,198,063
Operating Properties [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,279,004
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,399,096
Land and Improvements				1,279,004
Building and Improvements				6,399,096
Gross Amount Carried at End of Period	$ 7,678,100			7,678,100
Accumulated Depreciation	$ 886,370			886,370
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,678,100
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 886,370
Operating Properties [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				841,250
Initial Cost of Buildings				5,279,315
Costs Capitalized Subsequent to Acquisition				316,750
Land and Improvements				837,144
Building and Improvements				5,600,171
Gross Amount Carried at End of Period	$ 6,437,315			6,437,315
Accumulated Depreciation	$ 807,037			807,037
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,437,315
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 807,037
Operating Properties [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				3,429,062
Initial Cost of Land				690,750
Initial Cost of Buildings				5,086,388
Costs Capitalized Subsequent to Acquisition				132,973
Land and Improvements				690,750
Building and Improvements				5,219,361
Gross Amount Carried at End of Period	$ 5,910,111			5,910,111
Accumulated Depreciation	$ 618,965			618,965
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,910,111
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 618,965
Operating Properties [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				3,445,719
Initial Cost of Land				603,003
Initial Cost of Buildings				4,969,011
Costs Capitalized Subsequent to Acquisition				146,835
Land and Improvements				603,003
Building and Improvements				5,115,846
Gross Amount Carried at End of Period	$ 5,718,849			5,718,849
Accumulated Depreciation	$ 686,589			686,589
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,718,849
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 686,589
Operating Properties [Member] | 5032 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,416,763
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,029,649
Land and Improvements				1,416,763
Building and Improvements				9,029,649
Gross Amount Carried at End of Period	$ 10,446,412			10,446,412
Accumulated Depreciation	$ 162,570			162,570
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,446,412
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 162,570
Operating Properties [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				2,931,771
Initial Cost of Land				509,247
Initial Cost of Buildings				4,710,218
Costs Capitalized Subsequent to Acquisition				183,541
Land and Improvements				613,962
Building and Improvements				4,789,044
Gross Amount Carried at End of Period	$ 5,403,006			5,403,006
Accumulated Depreciation	$ 605,740			605,740
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,403,006
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 605,740
Operating Properties [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				1,027,500
Initial Cost of Buildings				6,172,807
Costs Capitalized Subsequent to Acquisition				62,651
Land and Improvements				1,027,500
Building and Improvements				6,235,458
Gross Amount Carried at End of Period	$ 7,262,958			7,262,958
Accumulated Depreciation	$ 354,708			354,708
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,262,958
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 354,708
Operating Properties [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				527,873
Initial Cost of Buildings				4,959,206
Costs Capitalized Subsequent to Acquisition				287,144
Land and Improvements				527,873
Building and Improvements				5,246,350
Gross Amount Carried at End of Period	$ 5,774,223			5,774,223
Accumulated Depreciation	$ 648,191			648,191
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,774,223
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 648,191
Operating Properties [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				557,730
Initial Cost of Buildings				5,785,333
Costs Capitalized Subsequent to Acquisition				461,744
Land and Improvements				557,730
Building and Improvements				6,247,077
Gross Amount Carried at End of Period	$ 6,804,807			6,804,807
Accumulated Depreciation	$ 923,373			923,373
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,804,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 923,373
Operating Properties [Member] | 8924 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				654,713
Initial Cost of Buildings				5,365,823
Costs Capitalized Subsequent to Acquisition				0
Land and Improvements				654,713
Building and Improvements				5,365,823
Gross Amount Carried at End of Period	$ 6,020,536			6,020,536
Accumulated Depreciation	$ 5,466			5,466
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,020,536
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,466
Operating Properties [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Chesapeake, VA
Encumbrances				0
Initial Cost of Land				1,711,746
Initial Cost of Buildings				10,418,032
Costs Capitalized Subsequent to Acquisition				460,727
Land and Improvements				1,711,746
Building and Improvements				10,878,759
Gross Amount Carried at End of Period	$ 12,590,505			12,590,505
Accumulated Depreciation	$ 1,250,668			1,250,668
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,590,505
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,250,668
Operating Properties [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Cicero, IL
Encumbrances				0
Initial Cost of Land				3,540,236
Initial Cost of Buildings				20,130,552
Costs Capitalized Subsequent to Acquisition				928,916
Land and Improvements				3,540,236
Building and Improvements				21,059,468
Gross Amount Carried at End of Period	$ 24,599,704			24,599,704
Accumulated Depreciation	$ 2,292,856			2,292,856
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 24,599,704
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,292,856
Operating Properties [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Cincinnati, OH
Encumbrances				0
Initial Cost of Land				1,030,242
Initial Cost of Buildings				4,003,024
Costs Capitalized Subsequent to Acquisition				224,716
Land and Improvements				1,030,242
Building and Improvements				4,227,739
Gross Amount Carried at End of Period	$ 5,257,981			5,257,981
Accumulated Depreciation	$ 516,067			516,067
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,257,981
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 516,067
Operating Properties [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Cincinnati, OH
Encumbrances				0
Initial Cost of Land				1,138,166
Initial Cost of Buildings				5,914,789
Costs Capitalized Subsequent to Acquisition				230,172
Land and Improvements				1,138,166
Building and Improvements				6,144,961
Gross Amount Carried at End of Period	$ 7,283,127			7,283,127
Accumulated Depreciation	$ 729,876			729,876
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,283,127
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 729,876
Operating Properties [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Columbia, MD
Encumbrances				0
Initial Cost of Land				1,915,960
Initial Cost of Buildings				6,461,228
Costs Capitalized Subsequent to Acquisition				320,391
Land and Improvements				1,915,960
Building and Improvements				6,781,619
Gross Amount Carried at End of Period	$ 8,697,579			8,697,579
Accumulated Depreciation	$ 838,295			838,295
Date of Construction or Acquisition	2,013
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	$ 838,295
Operating Properties [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Columbus, OH
Encumbrances				0
Initial Cost of Land				540,601
Initial Cost of Buildings				5,129,342
Costs Capitalized Subsequent to Acquisition				835,318
Land and Improvements				540,601
Building and Improvements				5,964,660
Gross Amount Carried at End of Period	$ 6,505,261			6,505,261
Accumulated Depreciation	$ 600,700			600,700
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,505,261
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 600,700
Operating Properties [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Columbus, OH
Encumbrances				0
Initial Cost of Land				549,393
Initial Cost of Buildings				4,643,302
Costs Capitalized Subsequent to Acquisition				499,543
Land and Improvements				549,393
Building and Improvements				5,142,845
Gross Amount Carried at End of Period	$ 5,692,238			5,692,238
Accumulated Depreciation	$ 538,373			538,373
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,692,238
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 538,373
Operating Properties [Member] | 330 South Royal Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Coppell, TX
Encumbrances				0
Initial Cost of Land				2,091,426
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				11,402,325
Land and Improvements				2,091,426
Building and Improvements				11,402,325
Gross Amount Carried at End of Period	$ 13,493,751			13,493,751
Accumulated Depreciation	$ 463,175			463,175
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,493,751
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 463,175
Operating Properties [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Coppell, TX
Encumbrances				0
Initial Cost of Land				312,701
Initial Cost of Buildings				2,311,531
Costs Capitalized Subsequent to Acquisition				742,190
Land and Improvements				312,701
Building and Improvements				3,053,721
Gross Amount Carried at End of Period	$ 3,366,422			3,366,422
Accumulated Depreciation	$ 587,157			587,157
Date of Construction or Acquisition	2,013
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	$ 587,157
Operating Properties [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Crofton, MD
Encumbrances				0
Initial Cost of Land				3,172,032
Initial Cost of Buildings				7,350,782
Costs Capitalized Subsequent to Acquisition				418,907
Land and Improvements				3,172,032
Building and Improvements				7,769,689
Gross Amount Carried at End of Period	$ 10,941,721			10,941,721
Accumulated Depreciation	$ 908,002			908,002
Date of Construction or Acquisition	2,013
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	$ 908,002
Operating Properties [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Dayton, NJ
Encumbrances				0
Initial Cost of Land				4,039,559
Initial Cost of Buildings				20,863,051
Costs Capitalized Subsequent to Acquisition				2,285,014
Land and Improvements				4,039,559
Building and Improvements				23,148,065
Gross Amount Carried at End of Period	$ 27,187,624			27,187,624
Accumulated Depreciation	$ 2,515,094			2,515,094
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 27,187,624
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,515,094
Operating Properties [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Deer Park, TX
Encumbrances				0
Initial Cost of Land				829,570
Initial Cost of Buildings				4,778,327
Costs Capitalized Subsequent to Acquisition				120,899
Land and Improvements				831,611
Building and Improvements				4,897,185
Gross Amount Carried at End of Period	$ 5,728,796			5,728,796
Accumulated Depreciation	$ 1,310,568			1,310,568
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,728,796
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,310,568
Operating Properties [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duluth, GA
Encumbrances				0
Initial Cost of Land				1,928,412
Initial Cost of Buildings				4,651,819
Costs Capitalized Subsequent to Acquisition				573,627
Land and Improvements				1,928,412
Building and Improvements				5,225,446
Gross Amount Carried at End of Period	$ 7,153,858			7,153,858
Accumulated Depreciation	$ 831,701			831,701
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,153,858
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 831,701
Operating Properties [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duluth, GA
Encumbrances				0
Initial Cost of Land				1,082,072
Initial Cost of Buildings				2,496,599
Costs Capitalized Subsequent to Acquisition				549,432
Land and Improvements				1,082,072
Building and Improvements				3,046,031
Gross Amount Carried at End of Period	$ 4,128,103			4,128,103
Accumulated Depreciation	$ 452,838			452,838
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,128,103
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 452,838
Operating Properties [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duluth, GA
Encumbrances				0
Initial Cost of Land				1,676,415
Initial Cost of Buildings				4,567,592
Costs Capitalized Subsequent to Acquisition				927,127
Land and Improvements				1,676,415
Building and Improvements				5,494,720
Gross Amount Carried at End of Period	$ 7,171,135			7,171,135
Accumulated Depreciation	$ 637,871			637,871
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,171,135
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 637,871
Operating Properties [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duncan, SC
Encumbrances				0
Initial Cost of Land				598,348
Initial Cost of Buildings				3,643,756
Costs Capitalized Subsequent to Acquisition				549,357
Land and Improvements				598,918
Building and Improvements				4,192,543
Gross Amount Carried at End of Period	$ 4,791,461			4,791,461
Accumulated Depreciation	$ 1,205,279			1,205,279
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,791,461
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,205,279
Operating Properties [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duncan, SC
Encumbrances				0
Initial Cost of Land				551,663
Initial Cost of Buildings				3,310,993
Costs Capitalized Subsequent to Acquisition				251,300
Land and Improvements				552,211
Building and Improvements				3,561,744
Gross Amount Carried at End of Period	$ 4,113,955			4,113,955
Accumulated Depreciation	$ 969,780			969,780
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,113,955
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 969,780
Operating Properties [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duncan, SC
Encumbrances				0
Initial Cost of Land				901,444
Initial Cost of Buildings				5,751,389
Costs Capitalized Subsequent to Acquisition				193,199
Land and Improvements				902,374
Building and Improvements				5,943,658
Gross Amount Carried at End of Period	$ 6,846,032			6,846,032
Accumulated Depreciation	$ 1,915,845			1,915,845
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,846,032
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,915,845
Operating Properties [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Duncan, SC
Encumbrances				0
Initial Cost of Land				975,433
Initial Cost of Buildings				5,851,990
Costs Capitalized Subsequent to Acquisition				413,247
Land and Improvements				976,393
Building and Improvements				6,264,277
Gross Amount Carried at End of Period	$ 7,240,670			7,240,670
Accumulated Depreciation	$ 1,712,719			1,712,719
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,240,670
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,712,719
Operating Properties [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				2,229,000
Initial Cost of Buildings				7,064,506
Costs Capitalized Subsequent to Acquisition				603,830
Land and Improvements				2,229,000
Building and Improvements				7,668,336
Gross Amount Carried at End of Period	$ 9,897,336			9,897,336
Accumulated Depreciation	$ 534,490			534,490
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,897,336
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 534,490
Operating Properties [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,440,000
Initial Cost of Buildings				7,932,265
Costs Capitalized Subsequent to Acquisition				163,047
Land and Improvements				1,440,000
Building and Improvements				8,095,312
Gross Amount Carried at End of Period	$ 9,535,312			9,535,312
Accumulated Depreciation	$ 763,084			763,084
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,535,312
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 763,084
Operating Properties [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,500,000
Initial Cost of Buildings				5,624,030
Costs Capitalized Subsequent to Acquisition				214,857
Land and Improvements				1,500,000
Building and Improvements				5,838,886
Gross Amount Carried at End of Period	$ 7,338,886			7,338,886
Accumulated Depreciation	$ 378,331			378,331
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,338,886
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 378,331
Operating Properties [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,440,000
Initial Cost of Buildings				7,356,161
Costs Capitalized Subsequent to Acquisition				(4,933)
Land and Improvements				1,440,000
Building and Improvements				7,351,228
Gross Amount Carried at End of Period	$ 8,791,228			8,791,228
Accumulated Depreciation	$ 649,580			649,580
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,791,228
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 649,580
Operating Properties [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,576,500
Initial Cost of Buildings				4,240,961
Costs Capitalized Subsequent to Acquisition				(8,916)
Land and Improvements				1,576,500
Building and Improvements				4,232,045
Gross Amount Carried at End of Period	$ 5,808,545			5,808,545
Accumulated Depreciation	$ 305,053			305,053
Date of Construction or Acquisition	2,002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,808,545
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 305,053
Operating Properties [Member] | 1957 TW Alexander Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,844,943
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,938,998
Land and Improvements				3,091,046
Building and Improvements				6,692,895
Gross Amount Carried at End of Period	$ 9,783,941			9,783,941
Accumulated Depreciation	$ 1,131			1,131
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,783,941
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,131
Operating Properties [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eagan, MN
Encumbrances				0
Initial Cost of Land				988,594
Initial Cost of Buildings				6,586,907
Costs Capitalized Subsequent to Acquisition				6,464
Land and Improvements				988,594
Building and Improvements				6,593,371
Gross Amount Carried at End of Period	$ 7,581,965			7,581,965
Accumulated Depreciation	$ 928,496			928,496
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,581,965
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 928,496
Operating Properties [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eagan, MN
Encumbrances				0
Initial Cost of Land				999,702
Initial Cost of Buildings				4,042,589
Costs Capitalized Subsequent to Acquisition				325,995
Land and Improvements				999,702
Building and Improvements				4,368,584
Gross Amount Carried at End of Period	$ 5,368,286			5,368,286
Accumulated Depreciation	$ 966,648			966,648
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,368,286
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 966,648
Operating Properties [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eagan, MN
Encumbrances				0
Initial Cost of Land				1,493,115
Initial Cost of Buildings				6,120,455
Costs Capitalized Subsequent to Acquisition				609,183
Land and Improvements				1,493,115
Building and Improvements				6,729,638
Gross Amount Carried at End of Period	$ 8,222,753			8,222,753
Accumulated Depreciation	$ 873,373			873,373
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,222,753
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 873,373
Operating Properties [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				120,622
Initial Cost of Buildings				1,085,226
Costs Capitalized Subsequent to Acquisition				310,312
Land and Improvements				118,300
Building and Improvements				1,397,860
Gross Amount Carried at End of Period	$ 1,516,160			1,516,160
Accumulated Depreciation	$ 643,228			643,228
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,516,160
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 643,228
Operating Properties [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				145,198
Initial Cost of Buildings				1,305,700
Costs Capitalized Subsequent to Acquisition				578,495
Land and Improvements				142,399
Building and Improvements				1,886,994
Gross Amount Carried at End of Period	$ 2,029,393			2,029,393
Accumulated Depreciation	$ 892,182			892,182
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,029,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 892,182
Operating Properties [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				110,746
Initial Cost of Buildings				995,868
Costs Capitalized Subsequent to Acquisition				285,802
Land and Improvements				108,610
Building and Improvements				1,283,806
Gross Amount Carried at End of Period	$ 1,392,416			1,392,416
Accumulated Depreciation	$ 611,942			611,942
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,392,416
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 611,942
Operating Properties [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				275,903
Initial Cost of Buildings				2,481,666
Costs Capitalized Subsequent to Acquisition				900,007
Land and Improvements				270,584
Building and Improvements				3,386,992
Gross Amount Carried at End of Period	$ 3,657,576			3,657,576
Accumulated Depreciation	$ 1,712,016			1,712,016
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,657,576
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,712,016
Operating Properties [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				291,077
Initial Cost of Buildings				2,618,194
Costs Capitalized Subsequent to Acquisition				1,530,128
Land and Improvements				285,464
Building and Improvements				4,153,935
Gross Amount Carried at End of Period	$ 4,439,399			4,439,399
Accumulated Depreciation	$ 1,737,212			1,737,212
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,439,399
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,737,212
Operating Properties [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				269,618
Initial Cost of Buildings				2,423,318
Costs Capitalized Subsequent to Acquisition				2,269,368
Land and Improvements				264,419
Building and Improvements				4,697,885
Gross Amount Carried at End of Period	$ 4,962,304			4,962,304
Accumulated Depreciation	$ 1,895,959			1,895,959
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,962,304
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,895,959
Operating Properties [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				10,232,831
Initial Cost of Buildings				10,855,851
Costs Capitalized Subsequent to Acquisition				4,331,163
Land and Improvements				10,243,977
Building and Improvements				15,175,867
Gross Amount Carried at End of Period	$ 25,419,844			25,419,844
Accumulated Depreciation	$ 2,955,224			2,955,224
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 25,419,844
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,955,224
Operating Properties [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				343,093
Initial Cost of Buildings				3,085,795
Costs Capitalized Subsequent to Acquisition				1,528,369
Land and Improvements				336,481
Building and Improvements				4,620,776
Gross Amount Carried at End of Period	$ 4,957,257			4,957,257
Accumulated Depreciation	$ 2,436,859			2,436,859
Date of Construction or Acquisition	2,013
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	$ 2,436,859
Operating Properties [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				993,101
Initial Cost of Buildings				2,136,862
Costs Capitalized Subsequent to Acquisition				881,416
Land and Improvements				993,101
Building and Improvements				3,018,277
Gross Amount Carried at End of Period	$ 4,011,378			4,011,378
Accumulated Depreciation	$ 1,231,573			1,231,573
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,011,378
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,231,573
Operating Properties [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elk Grove, IL
Encumbrances				0
Initial Cost of Land				1,403,196
Initial Cost of Buildings				2,386,396
Costs Capitalized Subsequent to Acquisition				149,086
Land and Improvements				1,403,196
Building and Improvements				2,535,482
Gross Amount Carried at End of Period	$ 3,938,678			3,938,678
Accumulated Depreciation	$ 296,511			296,511
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,938,678
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 296,511
Operating Properties [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elkridge, MD
Encumbrances				0
Initial Cost of Land				3,680,220
Initial Cost of Buildings				14,671,910
Costs Capitalized Subsequent to Acquisition				701,811
Land and Improvements				3,680,220
Building and Improvements				15,373,721
Gross Amount Carried at End of Period	$ 19,053,941			19,053,941
Accumulated Depreciation	$ 1,493,289			1,493,289
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,053,941
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,493,289
Operating Properties [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elkridge, MD
Encumbrances				0
Initial Cost of Land				2,421,854
Initial Cost of Buildings				9,730,192
Costs Capitalized Subsequent to Acquisition				566,777
Land and Improvements				2,421,854
Building and Improvements				10,296,969
Gross Amount Carried at End of Period	$ 12,718,823			12,718,823
Accumulated Depreciation	$ 1,042,430			1,042,430
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,718,823
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,042,430
Operating Properties [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elkridge, MD
Encumbrances				0
Initial Cost of Land				1,897,044
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,410,314
Land and Improvements				3,023,417
Building and Improvements				6,283,941
Gross Amount Carried at End of Period	$ 9,307,358			9,307,358
Accumulated Depreciation	$ 1,815,210			1,815,210
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,307,358
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,815,210
Operating Properties [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elwood, IL
Encumbrances				0
Initial Cost of Land				10,594,259
Initial Cost of Buildings				30,329,802
Costs Capitalized Subsequent to Acquisition				895,205
Land and Improvements				10,594,259
Building and Improvements				31,225,008
Gross Amount Carried at End of Period	$ 41,819,267			41,819,267
Accumulated Depreciation	$ 4,440,370			4,440,370
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 41,819,267
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,440,370
Operating Properties [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Elwood, IL
Encumbrances				0
Initial Cost of Land				6,022,000
Initial Cost of Buildings				5,612,934
Costs Capitalized Subsequent to Acquisition				318,163
Land and Improvements				6,022,000
Building and Improvements				5,931,097
Gross Amount Carried at End of Period	$ 11,953,097			11,953,097
Accumulated Depreciation	$ 925,484			925,484
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,953,097
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 925,484
Operating Properties [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Erlanger, KY
Encumbrances				0
Initial Cost of Land				0
Initial Cost of Buildings				13,211,604
Costs Capitalized Subsequent to Acquisition				709,891
Land and Improvements				0
Building and Improvements				13,921,495
Gross Amount Carried at End of Period	$ 13,921,495			13,921,495
Accumulated Depreciation	$ 3,004,403			3,004,403
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,921,495
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,004,403
Operating Properties [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fairfield, OH
Encumbrances				0
Initial Cost of Land				412,136
Initial Cost of Buildings				3,029,177
Costs Capitalized Subsequent to Acquisition				155,862
Land and Improvements				412,136
Building and Improvements				3,185,039
Gross Amount Carried at End of Period	$ 3,597,175			3,597,175
Accumulated Depreciation	$ 340,785			340,785
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,597,175
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 340,785
Operating Properties [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fairfield, OH
Encumbrances				0
Initial Cost of Land				367,925
Initial Cost of Buildings				2,205,817
Costs Capitalized Subsequent to Acquisition				144,414
Land and Improvements				386,928
Building and Improvements				2,331,228
Gross Amount Carried at End of Period	$ 2,718,156			2,718,156
Accumulated Depreciation	$ 246,535			246,535
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,718,156
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 246,535
Operating Properties [Member] | 10721 Jasmine Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fontana, CA
Encumbrances				0
Initial Cost of Land				11,427,061
Initial Cost of Buildings				23,784,779
Costs Capitalized Subsequent to Acquisition				2,353,817
Land and Improvements				11,427,061
Building and Improvements				26,138,596
Gross Amount Carried at End of Period	$ 37,565,657			37,565,657
Accumulated Depreciation	$ 1,035,397			1,035,397
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 37,565,657
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,035,397
Operating Properties [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Forest Park, GA
Encumbrances				0
Initial Cost of Land				756,221
Initial Cost of Buildings				9,115,626
Costs Capitalized Subsequent to Acquisition				626,719
Land and Improvements				756,221
Building and Improvements				9,742,345
Gross Amount Carried at End of Period	$ 10,498,566			10,498,566
Accumulated Depreciation	$ 1,116,707			1,116,707
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,498,566
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,116,707
Operating Properties [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fort Lauderdale, FL
Encumbrances				0
Initial Cost of Land				545,480
Initial Cost of Buildings				2,540,210
Costs Capitalized Subsequent to Acquisition				66,119
Land and Improvements				545,480
Building and Improvements				2,606,329
Gross Amount Carried at End of Period	$ 3,151,809			3,151,809
Accumulated Depreciation	259,627			259,627
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	$ 259,627
Operating Properties [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fort Lauderdale, FL
Encumbrances				0
Initial Cost of Land				0
Initial Cost of Buildings				3,064,734
Costs Capitalized Subsequent to Acquisition				411,144
Land and Improvements				0
Building and Improvements				3,475,878
Gross Amount Carried at End of Period	$ 3,475,878			3,475,878
Accumulated Depreciation	$ 398,203			398,203
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,475,878
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 398,203
Operating Properties [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fort Lauderdale, FL
Encumbrances				0
Initial Cost of Land				519,984
Initial Cost of Buildings				2,677,465
Costs Capitalized Subsequent to Acquisition				43,251
Land and Improvements				519,984
Building and Improvements				2,720,716
Gross Amount Carried at End of Period	$ 3,240,700			3,240,700
Accumulated Depreciation	$ 247,442			247,442
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,240,700
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 247,442
Operating Properties [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fort Lauderdale, FL
Encumbrances				0
Initial Cost of Land				0
Initial Cost of Buildings				2,988,181
Costs Capitalized Subsequent to Acquisition				274,482
Land and Improvements				0
Building and Improvements				3,262,663
Gross Amount Carried at End of Period	$ 3,262,663			3,262,663
Accumulated Depreciation	$ 386,938			386,938
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,262,663
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 386,938
Operating Properties [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Fredericksburg, VA
Encumbrances				0
Initial Cost of Land				475,262
Initial Cost of Buildings				3,917,234
Costs Capitalized Subsequent to Acquisition				242,595
Land and Improvements				475,262
Building and Improvements				4,159,829
Gross Amount Carried at End of Period	$ 4,635,091			4,635,091
Accumulated Depreciation	$ 2,250,921			2,250,921
Date of Construction or Acquisition	2,013
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	$ 2,250,921
Operating Properties [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Ft. Lauderdale, FL
Encumbrances				0
Initial Cost of Land				603,776
Initial Cost of Buildings				4,176,238
Costs Capitalized Subsequent to Acquisition				1,976,991
Land and Improvements				625,111
Building and Improvements				6,131,894
Gross Amount Carried at End of Period	$ 6,757,005			6,757,005
Accumulated Depreciation	$ 3,000,812			3,000,812
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,757,005
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,000,812
Operating Properties [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Garden Grove, CA
Encumbrances				0
Initial Cost of Land				2,048,143
Initial Cost of Buildings				1,088,697
Costs Capitalized Subsequent to Acquisition				70,518
Land and Improvements				2,048,143
Building and Improvements				1,159,215
Gross Amount Carried at End of Period	$ 3,207,358			3,207,358
Accumulated Depreciation	$ 223,297			223,297
Date of Construction or Acquisition	2,013
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	$ 223,297
Operating Properties [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Garden Grove, CA
Encumbrances				0
Initial Cost of Land				3,766,822
Initial Cost of Buildings				2,539,214
Costs Capitalized Subsequent to Acquisition				132,812
Land and Improvements				3,766,822
Building and Improvements				2,672,026
Gross Amount Carried at End of Period	$ 6,438,848			6,438,848
Accumulated Depreciation	$ 315,709			315,709
Date of Construction or Acquisition	2,013
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	$ 315,709
Operating Properties [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Garden Grove, CA
Encumbrances				0
Initial Cost of Land				5,221,102
Initial Cost of Buildings				3,225,596
Costs Capitalized Subsequent to Acquisition				83,450
Land and Improvements				5,220,148
Building and Improvements				3,310,000
Gross Amount Carried at End of Period	$ 8,530,148			8,530,148
Accumulated Depreciation	$ 261,465			261,465
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,530,148
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 261,465
Operating Properties [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Garland, TX
Encumbrances				0
Initial Cost of Land				799,707
Initial Cost of Buildings				6,122,065
Costs Capitalized Subsequent to Acquisition				505,061
Land and Improvements				799,707
Building and Improvements				6,627,126
Gross Amount Carried at End of Period	$ 7,426,833			7,426,833
Accumulated Depreciation	$ 752,290			752,290
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,426,833
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 752,290
Operating Properties [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Grand Prairie, TX
Encumbrances				0
Initial Cost of Land				1,785,741
Initial Cost of Buildings				11,158,818
Costs Capitalized Subsequent to Acquisition				882,172
Land and Improvements				1,785,741
Building and Improvements				12,040,990
Gross Amount Carried at End of Period	$ 13,826,731			13,826,731
Accumulated Depreciation	$ 1,646,773			1,646,773
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,826,731
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,646,773
Operating Properties [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Grapevine, TX
Encumbrances				0
Initial Cost of Land				1,165,780
Initial Cost of Buildings				7,799,270
Costs Capitalized Subsequent to Acquisition				422,213
Land and Improvements				1,165,780
Building and Improvements				8,221,482
Gross Amount Carried at End of Period	$ 9,387,262			9,387,262
Accumulated Depreciation	$ 1,009,876			1,009,876
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,387,262
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,009,876
Operating Properties [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greensboro, NC
Encumbrances				0
Initial Cost of Land				1,547,811
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,208,812
Land and Improvements				3,712,683
Building and Improvements				12,043,940
Gross Amount Carried at End of Period	$ 15,756,623			15,756,623
Accumulated Depreciation	$ 2,616,841			2,616,841
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 15,756,623
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,616,841
Operating Properties [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greenville, SC
Encumbrances				0
Initial Cost of Land				288,823
Initial Cost of Buildings				3,441,512
Costs Capitalized Subsequent to Acquisition				43,182
Land and Improvements				288,823
Building and Improvements				3,484,694
Gross Amount Carried at End of Period	$ 3,773,517			3,773,517
Accumulated Depreciation	$ 374,491			374,491
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,773,517
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 374,491
Operating Properties [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greenville, SC
Encumbrances				0
Initial Cost of Land				818,114
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,470,587
Land and Improvements				825,529
Building and Improvements				4,463,172
Gross Amount Carried at End of Period	$ 5,288,701			5,288,701
Accumulated Depreciation	$ 1,144,890			1,144,890
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,288,701
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,144,890
Operating Properties [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greenwood, IN
Encumbrances				0
Initial Cost of Land				223,702
Initial Cost of Buildings				3,574,142
Costs Capitalized Subsequent to Acquisition				349,736
Land and Improvements				223,702
Building and Improvements				3,923,878
Gross Amount Carried at End of Period	$ 4,147,580			4,147,580
Accumulated Depreciation	$ 515,529			515,529
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,147,580
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 515,529
Operating Properties [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greenwood, IN
Encumbrances				0
Initial Cost of Land				272,823
Initial Cost of Buildings				3,606,920
Costs Capitalized Subsequent to Acquisition				425,965
Land and Improvements				272,823
Building and Improvements				4,032,886
Gross Amount Carried at End of Period	$ 4,305,709			4,305,709
Accumulated Depreciation	$ 674,940			674,940
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,305,709
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 674,940
Operating Properties [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greenwood, IN
Encumbrances				0
Initial Cost of Land				1,374,664
Initial Cost of Buildings				29,963,830
Costs Capitalized Subsequent to Acquisition				1,616,774
Land and Improvements				1,374,664
Building and Improvements				31,580,604
Gross Amount Carried at End of Period	$ 32,955,268			32,955,268
Accumulated Depreciation	$ 3,605,585			3,605,585
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 32,955,268
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,605,585
Operating Properties [Member] | 110 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				555,549
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,331,166
Land and Improvements				1,228,880
Building and Improvements				5,657,835
Gross Amount Carried at End of Period	$ 6,886,715			6,886,715
Accumulated Depreciation	$ 325,933			325,933
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,886,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 325,933
Operating Properties [Member] | 140 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				1,243,100
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,426,293
Land and Improvements				1,243,100
Building and Improvements				6,426,293
Gross Amount Carried at End of Period	$ 7,669,393			7,669,393
Accumulated Depreciation	$ 395,610			395,610
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,669,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 395,610
Operating Properties [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				464,237
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,829,595
Land and Improvements				1,301,738
Building and Improvements				4,992,094
Gross Amount Carried at End of Period	$ 6,293,832			6,293,832
Accumulated Depreciation	$ 1,011,407			1,011,407
Date of Construction or Acquisition	2,007
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	$ 1,011,407
Operating Properties [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Groveport, OH
Encumbrances				0
Initial Cost of Land				1,875,607
Initial Cost of Buildings				11,937,935
Costs Capitalized Subsequent to Acquisition				1,672,294
Land and Improvements				1,875,607
Building and Improvements				13,610,229
Gross Amount Carried at End of Period	$ 15,485,836			15,485,836
Accumulated Depreciation	$ 1,592,762			1,592,762
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 15,485,836
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,592,762
Operating Properties [Member] | 11835 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hagerstown, MD
Encumbrances				0
Initial Cost of Land				14,121,622
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				23,019,069
Land and Improvements				14,121,622
Building and Improvements				23,019,069
Gross Amount Carried at End of Period	$ 37,140,691			37,140,691
Accumulated Depreciation	$ 1,429,004			1,429,004
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 37,140,691
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,429,004
Operating Properties [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hagerstown, MD
Encumbrances				0
Initial Cost of Land				3,356,207
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				30,566,609
Land and Improvements				9,741,685
Building and Improvements				24,181,131
Gross Amount Carried at End of Period	$ 33,922,816			33,922,816
Accumulated Depreciation	$ 5,846,534			5,846,534
Date of Construction or Acquisition	2,008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 33,922,816
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,846,534
Operating Properties [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hanover Park, IL
Encumbrances				0
Initial Cost of Land				2,639,734
Initial Cost of Buildings				12,310,741
Costs Capitalized Subsequent to Acquisition				1,125,886
Land and Improvements				2,639,734
Building and Improvements				13,436,627
Gross Amount Carried at End of Period	$ 16,076,361			16,076,361
Accumulated Depreciation	$ 1,418,917			1,418,917
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,076,361
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,418,917
Operating Properties [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hanover Park, IL
Encumbrances				0
Initial Cost of Land				3,293,284
Initial Cost of Buildings				17,235,926
Costs Capitalized Subsequent to Acquisition				1,159,989
Land and Improvements				3,293,284
Building and Improvements				18,395,915
Gross Amount Carried at End of Period	$ 21,689,199			21,689,199
Accumulated Depreciation	$ 2,021,398			2,021,398
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 21,689,199
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,021,398
Operating Properties [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hanover, MD
Encumbrances				0
Initial Cost of Land				2,245,187
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,419,956
Land and Improvements				3,822,710
Building and Improvements				7,842,433
Gross Amount Carried at End of Period	$ 11,665,143			11,665,143
Accumulated Depreciation	$ 1,629,408			1,629,408
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,665,143
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,629,408
Operating Properties [Member] | 7460 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hanover, MD
Encumbrances				0
Initial Cost of Land				3,785,446
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,658,893
Land and Improvements				3,796,023
Building and Improvements				7,648,316
Gross Amount Carried at End of Period	$ 11,444,339			11,444,339
Accumulated Depreciation	$ 333,250			333,250
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,444,339
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 333,250
Operating Properties [Member] | 7462 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hanover, MD
Encumbrances				0
Initial Cost of Land				4,059,337
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,481,893
Land and Improvements				4,070,629
Building and Improvements				7,470,601
Gross Amount Carried at End of Period	$ 11,541,230			11,541,230
Accumulated Depreciation	$ 325,162			325,162
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,541,230
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 325,162
Operating Properties [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Harrisburg, PA
Encumbrances				0
Initial Cost of Land				5,194,872
Initial Cost of Buildings				19,991,436
Costs Capitalized Subsequent to Acquisition				5,018,136
Land and Improvements				5,687,013
Building and Improvements				24,517,431
Gross Amount Carried at End of Period	$ 30,204,444			30,204,444
Accumulated Depreciation	$ 8,376,356			8,376,356
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 30,204,444
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,376,356
Operating Properties [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Harrisburg, PA
Encumbrances				0
Initial Cost of Land				7,743,800
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				29,159,534
Land and Improvements				9,368,557
Building and Improvements				27,534,777
Gross Amount Carried at End of Period	$ 36,903,334			36,903,334
Accumulated Depreciation	$ 8,663,016			8,663,016
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 36,903,334
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,663,016
Operating Properties [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Harrisburg, PA
Encumbrances				0
Initial Cost of Land				464,534
Initial Cost of Buildings				6,066,272
Costs Capitalized Subsequent to Acquisition				243,707
Land and Improvements				464,534
Building and Improvements				6,309,979
Gross Amount Carried at End of Period	$ 6,774,513			6,774,513
Accumulated Depreciation	$ 654,034			654,034
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,774,513
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 654,034
Operating Properties [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Harrisburg, PA
Encumbrances				0
Initial Cost of Land				954,130
Initial Cost of Buildings				10,585,367
Costs Capitalized Subsequent to Acquisition				547,545
Land and Improvements				954,130
Building and Improvements				11,132,912
Gross Amount Carried at End of Period	$ 12,087,042			12,087,042
Accumulated Depreciation	$ 1,069,407			1,069,407
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,087,042
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,069,407
Operating Properties [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hawthorne, CA
Encumbrances				0
Initial Cost of Land				2,203,194
Initial Cost of Buildings				5,758,809
Costs Capitalized Subsequent to Acquisition				94,181
Land and Improvements				2,203,194
Building and Improvements				5,852,990
Gross Amount Carried at End of Period	$ 8,056,184			8,056,184
Accumulated Depreciation	$ 649,501			649,501
Date of Construction or Acquisition	2,013
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	$ 649,501
Operating Properties [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hebron, KY
Encumbrances				0
Initial Cost of Land				305,471
Initial Cost of Buildings				5,434,505
Costs Capitalized Subsequent to Acquisition				(819,916)
Land and Improvements				305,471
Building and Improvements				4,614,589
Gross Amount Carried at End of Period	$ 4,920,060			4,920,060
Accumulated Depreciation	$ 627,848			627,848
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,920,060
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 627,848
Operating Properties [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hebron, KY
Encumbrances				0
Initial Cost of Land				401,410
Initial Cost of Buildings				3,087,899
Costs Capitalized Subsequent to Acquisition				511,543
Land and Improvements				401,410
Building and Improvements				3,599,442
Gross Amount Carried at End of Period	$ 4,000,852			4,000,852
Accumulated Depreciation	$ 612,450			612,450
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,000,852
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 612,450
Operating Properties [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hebron, KY
Encumbrances				0
Initial Cost of Land				292,096
Initial Cost of Buildings				2,502,486
Costs Capitalized Subsequent to Acquisition				163,618
Land and Improvements				292,096
Building and Improvements				2,666,103
Gross Amount Carried at End of Period	$ 2,958,199			2,958,199
Accumulated Depreciation	$ 354,922			354,922
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,958,199
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 354,922
Operating Properties [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hebron, KY
Encumbrances				0
Initial Cost of Land				370,149
Initial Cost of Buildings				3,095,116
Costs Capitalized Subsequent to Acquisition				427,153
Land and Improvements				370,149
Building and Improvements				3,522,270
Gross Amount Carried at End of Period	$ 3,892,419			3,892,419
Accumulated Depreciation	$ 469,314			469,314
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,892,419
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 469,314
Operating Properties [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hebron, KY
Encumbrances				0
Initial Cost of Land				444,318
Initial Cost of Buildings				3,811,889
Costs Capitalized Subsequent to Acquisition				257,404
Land and Improvements				444,318
Building and Improvements				4,069,293
Gross Amount Carried at End of Period	$ 4,513,611			4,513,611
Accumulated Depreciation	$ 510,796			510,796
Date of Construction or Acquisition	2,013
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	$ 510,796
Operating Properties [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				94,274
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,174,627
Land and Improvements				791,880
Building and Improvements				5,477,021
Gross Amount Carried at End of Period	$ 6,268,901			6,268,901
Accumulated Depreciation	$ 1,470,238			1,470,238
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,268,901
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,470,238
Operating Properties [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				122,203
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,216,383
Land and Improvements				526,266
Building and Improvements				2,812,320
Gross Amount Carried at End of Period	$ 3,338,586			3,338,586
Accumulated Depreciation	$ 1,209,332			1,209,332
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,338,586
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,209,332
Operating Properties [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				100,106
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,610,018
Land and Improvements				431,106
Building and Improvements				3,279,018
Gross Amount Carried at End of Period	$ 3,710,124			3,710,124
Accumulated Depreciation	$ 1,596,673			1,596,673
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,710,124
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,596,673
Operating Properties [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				107,586
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,391,467
Land and Improvements				505,700
Building and Improvements				2,993,353
Gross Amount Carried at End of Period	$ 3,499,053			3,499,053
Accumulated Depreciation	$ 893,968			893,968
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,499,053
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 893,968
Operating Properties [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				539,575
Initial Cost of Land				521,122
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,278,965
Land and Improvements				825,092
Building and Improvements				4,974,995
Gross Amount Carried at End of Period	$ 5,800,087			5,800,087
Accumulated Depreciation	$ 2,396,029			2,396,029
Date of Construction or Acquisition	1,995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,800,087
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,396,029
Operating Properties [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				484,001
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,113,990
Land and Improvements				173,623
Building and Improvements				3,424,368
Gross Amount Carried at End of Period	$ 3,597,991			3,597,991
Accumulated Depreciation	$ 1,769,967			1,769,967
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,597,991
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,769,967
Operating Properties [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				282,996
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,209,513
Land and Improvements				283,368
Building and Improvements				2,209,141
Gross Amount Carried at End of Period	$ 2,492,509			2,492,509
Accumulated Depreciation	$ 1,125,857			1,125,857
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,492,509
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,125,857
Operating Properties [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				143,661
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,214,707
Land and Improvements				132,655
Building and Improvements				1,225,713
Gross Amount Carried at End of Period	$ 1,358,368			1,358,368
Accumulated Depreciation	$ 613,784			613,784
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,358,368
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 613,784
Operating Properties [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				748,693
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,806,479
Land and Improvements				1,525,421
Building and Improvements				6,029,751
Gross Amount Carried at End of Period	$ 7,555,172			7,555,172
Accumulated Depreciation	$ 1,279,125			1,279,125
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,555,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,279,125
Operating Properties [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				230,622
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,744,942
Land and Improvements				231,692
Building and Improvements				2,743,872
Gross Amount Carried at End of Period	$ 2,975,564			2,975,564
Accumulated Depreciation	$ 1,509,824			1,509,824
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,975,564
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,509,824
Operating Properties [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				319,289
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,110,458
Land and Improvements				320,450
Building and Improvements				3,109,297
Gross Amount Carried at End of Period	$ 3,429,747			3,429,747
Accumulated Depreciation	$ 1,850,162			1,850,162
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,429,747
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,850,162
Operating Properties [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				234,564
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,280,376
Land and Improvements				235,698
Building and Improvements				3,279,242
Gross Amount Carried at End of Period	$ 3,514,940			3,514,940
Accumulated Depreciation	$ 2,138,014			2,138,014
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,514,940
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,138,014
Operating Properties [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				182,810
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,815,190
Land and Improvements				183,888
Building and Improvements				2,814,112
Gross Amount Carried at End of Period	$ 2,998,000			2,998,000
Accumulated Depreciation	$ 1,690,876			1,690,876
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,998,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,690,876
Operating Properties [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hinckley, UK
Encumbrances				0
Initial Cost of Land				10,547,677
Initial Cost of Buildings				29,691,911
Costs Capitalized Subsequent to Acquisition				(10,236,705)
Land and Improvements				7,864,413
Building and Improvements				22,138,470
Gross Amount Carried at End of Period	$ 30,002,883			30,002,883
Accumulated Depreciation	$ 2,341,916			2,341,916
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 30,002,883
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,341,916
Operating Properties [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hopkins,MN
Encumbrances				0
Initial Cost of Land				813,036
Initial Cost of Buildings				1,503,075
Costs Capitalized Subsequent to Acquisition				362,817
Land and Improvements				813,036
Building and Improvements				1,865,892
Gross Amount Carried at End of Period	$ 2,678,928			2,678,928
Accumulated Depreciation	$ 384,705			384,705
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,678,928
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 384,705
Operating Properties [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Hopkins,MN
Encumbrances				0
Initial Cost of Land				339,336
Initial Cost of Buildings				2,106,454
Costs Capitalized Subsequent to Acquisition				80,794
Land and Improvements				339,336
Building and Improvements				2,187,249
Gross Amount Carried at End of Period	$ 2,526,585			2,526,585
Accumulated Depreciation	$ 229,679			229,679
Date of Construction or Acquisition	2,013
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	$ 229,679
Operating Properties [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				509,351
Initial Cost of Buildings				3,549,504
Costs Capitalized Subsequent to Acquisition				871,341
Land and Improvements				509,351
Building and Improvements				4,420,845
Gross Amount Carried at End of Period	$ 4,930,196			4,930,196
Accumulated Depreciation	$ 614,631			614,631
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,930,196
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 614,631
Operating Properties [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				558,491
Initial Cost of Buildings				5,740,552
Costs Capitalized Subsequent to Acquisition				133,643
Land and Improvements				558,491
Building and Improvements				5,874,195
Gross Amount Carried at End of Period	$ 6,432,686			6,432,686
Accumulated Depreciation	$ 575,354			575,354
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,432,686
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 575,354
Operating Properties [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				426,927
Initial Cost of Buildings				3,460,513
Costs Capitalized Subsequent to Acquisition				379,988
Land and Improvements				426,927
Building and Improvements				3,840,501
Gross Amount Carried at End of Period	$ 4,267,428			4,267,428
Accumulated Depreciation	$ 595,671			595,671
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,267,428
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 595,671
Operating Properties [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				545,501
Initial Cost of Buildings				2,927,700
Costs Capitalized Subsequent to Acquisition				1,023,687
Land and Improvements				545,501
Building and Improvements				3,951,386
Gross Amount Carried at End of Period	$ 4,496,887			4,496,887
Accumulated Depreciation	$ 543,738			543,738
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,496,887
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 543,738
Operating Properties [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,340,609
Initial Cost of Buildings				7,489,720
Costs Capitalized Subsequent to Acquisition				2,927,548
Land and Improvements				1,340,609
Building and Improvements				10,417,267
Gross Amount Carried at End of Period	$ 11,757,876			11,757,876
Accumulated Depreciation	$ 1,963,470			1,963,470
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,757,876
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,963,470
Operating Properties [Member] | 1050 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				973,482
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,627,200
Land and Improvements				992,093
Building and Improvements				3,608,589
Gross Amount Carried at End of Period	$ 4,600,682			4,600,682
Accumulated Depreciation	$ 251,402			251,402
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,600,682
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 251,402
Operating Properties [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				201,469
Initial Cost of Buildings				1,631,561
Costs Capitalized Subsequent to Acquisition				132,607
Land and Improvements				201,469
Building and Improvements				1,764,169
Gross Amount Carried at End of Period	$ 1,965,638			1,965,638
Accumulated Depreciation	$ 215,692			215,692
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,965,638
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 215,692
Operating Properties [Member] | 10720 West Sam Houston Pkwy N [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				3,871,875
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				28,945,116
Land and Improvements				3,871,875
Building and Improvements				28,945,116
Gross Amount Carried at End of Period	$ 32,816,991			32,816,991
Accumulated Depreciation	$ 737,940			737,940
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 32,816,991
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 737,940
Operating Properties [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,110,988
Initial Cost of Buildings				6,351,946
Costs Capitalized Subsequent to Acquisition				3,220,697
Land and Improvements				1,135,483
Building and Improvements				9,548,148
Gross Amount Carried at End of Period	$ 10,683,631			10,683,631
Accumulated Depreciation	$ 3,141,008			3,141,008
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,683,631
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,141,008
Operating Properties [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				797,931
Initial Cost of Buildings				5,950,894
Costs Capitalized Subsequent to Acquisition				527,409
Land and Improvements				799,560
Building and Improvements				6,476,674
Gross Amount Carried at End of Period	$ 7,276,234			7,276,234
Accumulated Depreciation	$ 2,438,811			2,438,811
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,276,234
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,438,811
Operating Properties [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,006,194
Initial Cost of Buildings				5,412,584
Costs Capitalized Subsequent to Acquisition				2,609,554
Land and Improvements				1,008,542
Building and Improvements				8,019,790
Gross Amount Carried at End of Period	$ 9,028,332			9,028,332
Accumulated Depreciation	$ 2,309,645			2,309,645
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,028,332
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,309,645
Operating Properties [Member] | 11220 Ella Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,505,855
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,397,354
Land and Improvements				1,534,644
Building and Improvements				7,368,565
Gross Amount Carried at End of Period	$ 8,903,209			8,903,209
Accumulated Depreciation	$ 348,583			348,583
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,903,209
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 348,583
Operating Properties [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				80,730
Initial Cost of Buildings				870,656
Costs Capitalized Subsequent to Acquisition				145,476
Land and Improvements				80,730
Building and Improvements				1,016,132
Gross Amount Carried at End of Period	$ 1,096,862			1,096,862
Accumulated Depreciation	$ 135,165			135,165
Date of Construction or Acquisition	2,013
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	$ 135,165
Operating Properties [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				146,654
Initial Cost of Buildings				1,620,780
Costs Capitalized Subsequent to Acquisition				59,710
Land and Improvements				146,654
Building and Improvements				1,680,489
Gross Amount Carried at End of Period	$ 1,827,143			1,827,143
Accumulated Depreciation	$ 236,879			236,879
Date of Construction or Acquisition	2,013
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	$ 236,879
Operating Properties [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				510,102
Initial Cost of Buildings				4,129,042
Costs Capitalized Subsequent to Acquisition				561,970
Land and Improvements				510,102
Building and Improvements				4,691,012
Gross Amount Carried at End of Period	$ 5,201,114			5,201,114
Accumulated Depreciation	$ 579,918			579,918
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,201,114
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 579,918
Operating Properties [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				218,850
Initial Cost of Buildings				1,639,902
Costs Capitalized Subsequent to Acquisition				556,292
Land and Improvements				218,850
Building and Improvements				2,196,193
Gross Amount Carried at End of Period	$ 2,415,043			2,415,043
Accumulated Depreciation	$ 301,676			301,676
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,415,043
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 301,676
Operating Properties [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				211,279
Initial Cost of Buildings				1,554,156
Costs Capitalized Subsequent to Acquisition				116,306
Land and Improvements				211,279
Building and Improvements				1,670,462
Gross Amount Carried at End of Period	$ 1,881,741			1,881,741
Accumulated Depreciation	$ 208,672			208,672
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,881,741
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 208,672
Operating Properties [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,396,794
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,859,739
Land and Improvements				1,699,632
Building and Improvements				4,556,901
Gross Amount Carried at End of Period	$ 6,256,533			6,256,533
Accumulated Depreciation	$ 531,845			531,845
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,256,533
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 531,845
Operating Properties [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				283,107
Initial Cost of Buildings				2,077,323
Costs Capitalized Subsequent to Acquisition				416,964
Land and Improvements				283,107
Building and Improvements				2,494,287
Gross Amount Carried at End of Period	$ 2,777,394			2,777,394
Accumulated Depreciation	$ 291,827			291,827
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,777,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 291,827
Operating Properties [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				367,446
Initial Cost of Buildings				1,952,453
Costs Capitalized Subsequent to Acquisition				183,185
Land and Improvements				367,446
Building and Improvements				2,135,637
Gross Amount Carried at End of Period	$ 2,503,083			2,503,083
Accumulated Depreciation	$ 259,350			259,350
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,503,083
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 259,350
Operating Properties [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,377,193
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,679,691
Land and Improvements				1,405,899
Building and Improvements				5,650,985
Gross Amount Carried at End of Period	$ 7,056,884			7,056,884
Accumulated Depreciation	$ 503,260			503,260
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,056,884
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 503,260
Operating Properties [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,830,419
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,239,740
Land and Improvements				1,861,540
Building and Improvements				7,208,619
Gross Amount Carried at End of Period	$ 9,070,159			9,070,159
Accumulated Depreciation	$ 1,322,096			1,322,096
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,070,159
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,322,096
Operating Properties [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				755,121
Initial Cost of Buildings				3,155,774
Costs Capitalized Subsequent to Acquisition				247,397
Land and Improvements				755,121
Building and Improvements				3,403,171
Gross Amount Carried at End of Period	$ 4,158,292			4,158,292
Accumulated Depreciation	$ 446,988			446,988
Date of Construction or Acquisition	2,013
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	$ 446,988
Operating Properties [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				418,580
Initial Cost of Buildings				1,564,587
Costs Capitalized Subsequent to Acquisition				230,574
Land and Improvements				418,580
Building and Improvements				1,795,161
Gross Amount Carried at End of Period	$ 2,213,741			2,213,741
Accumulated Depreciation	$ 245,069			245,069
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,213,741
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 245,069
Operating Properties [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,540,109
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,528,507
Land and Improvements				1,966,472
Building and Improvements				8,102,144
Gross Amount Carried at End of Period	$ 10,068,616			10,068,616
Accumulated Depreciation	$ 617,774			617,774
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,068,616
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 617,774
Operating Properties [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				438,853
Initial Cost of Buildings				3,030,396
Costs Capitalized Subsequent to Acquisition				552,188
Land and Improvements				438,853
Building and Improvements				3,582,584
Gross Amount Carried at End of Period	$ 4,021,437			4,021,437
Accumulated Depreciation	$ 1,828,930			1,828,930
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,021,437
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,828,930
Operating Properties [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				529,876
Initial Cost of Buildings				3,267,872
Costs Capitalized Subsequent to Acquisition				405,158
Land and Improvements				529,876
Building and Improvements				3,673,030
Gross Amount Carried at End of Period	$ 4,202,906			4,202,906
Accumulated Depreciation	$ 425,317			425,317
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,202,906
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 425,317
Operating Properties [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				363,339
Initial Cost of Buildings				2,509,186
Costs Capitalized Subsequent to Acquisition				364,183
Land and Improvements				363,339
Building and Improvements				2,873,369
Gross Amount Carried at End of Period	$ 3,236,708			3,236,708
Accumulated Depreciation	$ 1,339,476			1,339,476
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,236,708
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,339,476
Operating Properties [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				329,961
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,128,210
Land and Improvements				592,234
Building and Improvements				4,865,937
Gross Amount Carried at End of Period	$ 5,458,171			5,458,171
Accumulated Depreciation	$ 1,424,604			1,424,604
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,458,171
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,424,604
Operating Properties [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				197,226
Initial Cost of Buildings				935,036
Costs Capitalized Subsequent to Acquisition				528,658
Land and Improvements				197,226
Building and Improvements				1,463,694
Gross Amount Carried at End of Period	$ 1,660,920			1,660,920
Accumulated Depreciation	$ 240,071			240,071
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,660,920
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 240,071
Operating Properties [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				289,000
Initial Cost of Buildings				3,559,857
Costs Capitalized Subsequent to Acquisition				1,285,142
Land and Improvements				289,000
Building and Improvements				4,845,000
Gross Amount Carried at End of Period	$ 5,134,000			5,134,000
Accumulated Depreciation	$ 1,956,500			1,956,500
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,134,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,956,500
Operating Properties [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				284,403
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,461,695
Land and Improvements				503,779
Building and Improvements				5,242,319
Gross Amount Carried at End of Period	$ 5,746,098			5,746,098
Accumulated Depreciation	$ 1,435,142			1,435,142
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,746,098
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,435,142
Operating Properties [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				298,999
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,423,751
Land and Improvements				496,186
Building and Improvements				3,226,564
Gross Amount Carried at End of Period	$ 3,722,750			3,722,750
Accumulated Depreciation	$ 1,190,212			1,190,212
Date of Construction or Acquisition	2,002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,722,750
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,190,212
Operating Properties [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				452,439
Initial Cost of Buildings				2,016,585
Costs Capitalized Subsequent to Acquisition				535,863
Land and Improvements				452,439
Building and Improvements				2,552,447
Gross Amount Carried at End of Period	$ 3,004,886			3,004,886
Accumulated Depreciation	$ 217,319			217,319
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,004,886
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 217,319
Operating Properties [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				311,952
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,714,116
Land and Improvements				492,869
Building and Improvements				3,533,199
Gross Amount Carried at End of Period	$ 4,026,068			4,026,068
Accumulated Depreciation	$ 769,315			769,315
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,026,068
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 769,315
Operating Properties [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				414,691
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,455,222
Land and Improvements				414,691
Building and Improvements				2,455,222
Gross Amount Carried at End of Period	$ 2,869,913			2,869,913
Accumulated Depreciation	$ 758,065			758,065
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,869,913
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 758,065
Operating Properties [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				293,534
Initial Cost of Buildings				3,036,269
Costs Capitalized Subsequent to Acquisition				1,336,826
Land and Improvements				306,147
Building and Improvements				4,360,482
Gross Amount Carried at End of Period	$ 4,666,629			4,666,629
Accumulated Depreciation	$ 1,505,006			1,505,006
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,666,629
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,505,006
Operating Properties [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				226,973
Initial Cost of Buildings				1,174,979
Costs Capitalized Subsequent to Acquisition				142,562
Land and Improvements				226,973
Building and Improvements				1,317,541
Gross Amount Carried at End of Period	$ 1,544,514			1,544,514
Accumulated Depreciation	$ 196,184			196,184
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,544,514
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 196,184
Operating Properties [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				244,240
Initial Cost of Buildings				1,412,622
Costs Capitalized Subsequent to Acquisition				97,515
Land and Improvements				244,240
Building and Improvements				1,510,137
Gross Amount Carried at End of Period	$ 1,754,377			1,754,377
Accumulated Depreciation	$ 247,437			247,437
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,754,377
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 247,437
Operating Properties [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				252,907
Initial Cost of Buildings				1,504,053
Costs Capitalized Subsequent to Acquisition				68,292
Land and Improvements				252,907
Building and Improvements				1,572,345
Gross Amount Carried at End of Period	$ 1,825,252			1,825,252
Accumulated Depreciation	$ 203,559			203,559
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,825,252
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 203,559
Operating Properties [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,519,458
Initial Cost of Buildings				7,135,548
Costs Capitalized Subsequent to Acquisition				3,703,478
Land and Improvements				1,520,074
Building and Improvements				10,838,410
Gross Amount Carried at End of Period	$ 12,358,484			12,358,484
Accumulated Depreciation	$ 3,288,143			3,288,143
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,358,484
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,288,143
Operating Properties [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				2,173,287
Initial Cost of Buildings				8,868,256
Costs Capitalized Subsequent to Acquisition				2,296,346
Land and Improvements				2,173,942
Building and Improvements				11,163,947
Gross Amount Carried at End of Period	$ 13,337,889			13,337,889
Accumulated Depreciation	$ 2,648,783			2,648,783
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,337,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,648,783
Operating Properties [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,243,541
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,456,833
Land and Improvements				1,513,152
Building and Improvements				6,187,222
Gross Amount Carried at End of Period	$ 7,700,374			7,700,374
Accumulated Depreciation	$ 1,121,080			1,121,080
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,700,374
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,121,080
Operating Properties [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				900,953
Initial Cost of Buildings				5,323,727
Costs Capitalized Subsequent to Acquisition				475,338
Land and Improvements				900,953
Building and Improvements				5,799,065
Gross Amount Carried at End of Period	$ 6,700,018			6,700,018
Accumulated Depreciation	$ 588,757			588,757
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,700,018
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 588,757
Operating Properties [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				530,494
Initial Cost of Buildings				4,108,626
Costs Capitalized Subsequent to Acquisition				302,577
Land and Improvements				530,494
Building and Improvements				4,411,203
Gross Amount Carried at End of Period	$ 4,941,697			4,941,697
Accumulated Depreciation	$ 509,990			509,990
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,941,697
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 509,990
Operating Properties [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				450,422
Initial Cost of Buildings				3,304,942
Costs Capitalized Subsequent to Acquisition				1,076,398
Land and Improvements				450,422
Building and Improvements				4,381,340
Gross Amount Carried at End of Period	$ 4,831,762			4,831,762
Accumulated Depreciation	$ 559,879			559,879
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,831,762
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 559,879
Operating Properties [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				4,515,862
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				26,930,936
Land and Improvements				7,083,514
Building and Improvements				24,363,284
Gross Amount Carried at End of Period	$ 31,446,798			31,446,798
Accumulated Depreciation	$ 5,575,785			5,575,785
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 31,446,798
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,575,785
Operating Properties [Member] | 8303 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				4,613,370
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				16,411,802
Land and Improvements				4,858,863
Building and Improvements				16,166,309
Gross Amount Carried at End of Period	$ 21,025,172			21,025,172
Accumulated Depreciation	$ 556,508			556,508
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 21,025,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 556,508
Operating Properties [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				2,893,405
Initial Cost of Buildings				11,593,197
Costs Capitalized Subsequent to Acquisition				2,914,238
Land and Improvements				2,899,861
Building and Improvements				14,500,978
Gross Amount Carried at End of Period	$ 17,400,839			17,400,839
Accumulated Depreciation	$ 3,371,778			3,371,778
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 17,400,839
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,371,778
Operating Properties [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,399,365
Initial Cost of Buildings				6,344,650
Costs Capitalized Subsequent to Acquisition				1,583,440
Land and Improvements				1,374,012
Building and Improvements				7,953,443
Gross Amount Carried at End of Period	$ 9,327,455			9,327,455
Accumulated Depreciation	$ 1,899,501			1,899,501
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,327,455
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,899,501
Operating Properties [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				2,290,001
Initial Cost of Buildings				15,297,141
Costs Capitalized Subsequent to Acquisition				3,207,265
Land and Improvements				2,290,002
Building and Improvements				18,504,405
Gross Amount Carried at End of Period	$ 20,794,407			20,794,407
Accumulated Depreciation	$ 6,151,203			6,151,203
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,794,407
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,151,203
Operating Properties [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				2,774,995
Initial Cost of Buildings				6,364,767
Costs Capitalized Subsequent to Acquisition				1,373,297
Land and Improvements				2,775,021
Building and Improvements				7,738,037
Gross Amount Carried at End of Period	$ 10,513,058			10,513,058
Accumulated Depreciation	$ 2,800,334			2,800,334
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,513,058
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,800,334
Operating Properties [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				638,453
Initial Cost of Buildings				3,258,815
Costs Capitalized Subsequent to Acquisition				759,249
Land and Improvements				638,477
Building and Improvements				4,018,039
Gross Amount Carried at End of Period	$ 4,656,516			4,656,516
Accumulated Depreciation	$ 1,273,899			1,273,899
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,656,516
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,273,899
Operating Properties [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				504,317
Initial Cost of Buildings				2,878,351
Costs Capitalized Subsequent to Acquisition				1,342,043
Land and Improvements				504,341
Building and Improvements				4,220,370
Gross Amount Carried at End of Period	$ 4,724,711			4,724,711
Accumulated Depreciation	$ 1,565,437			1,565,437
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,724,711
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,565,437
Operating Properties [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				1,748,348
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,341,500
Land and Improvements				2,120,319
Building and Improvements				8,969,529
Gross Amount Carried at End of Period	$ 11,089,848			11,089,848
Accumulated Depreciation	$ 1,152,770			1,152,770
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,089,848
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,152,770
Operating Properties [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Isle of Man, UK
Encumbrances				0
Initial Cost of Land				11,888,058
Initial Cost of Buildings				35,003,668
Costs Capitalized Subsequent to Acquisition				(12,081,249)
Land and Improvements				8,863,808
Building and Improvements				25,946,669
Gross Amount Carried at End of Period	$ 34,810,477			34,810,477
Accumulated Depreciation	$ 2,411,261			2,411,261
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 34,810,477
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,411,261
Operating Properties [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Itasca, IL
Encumbrances				0
Initial Cost of Land				842,043
Initial Cost of Buildings				984,087
Costs Capitalized Subsequent to Acquisition				205,986
Land and Improvements				842,043
Building and Improvements				1,190,073
Gross Amount Carried at End of Period	$ 2,032,116			2,032,116
Accumulated Depreciation	$ 139,492			139,492
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,032,116
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 139,492
Operating Properties [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Itasca, IL
Encumbrances				0
Initial Cost of Land				875,172
Initial Cost of Buildings				2,071,051
Costs Capitalized Subsequent to Acquisition				124,976
Land and Improvements				875,172
Building and Improvements				2,196,028
Gross Amount Carried at End of Period	$ 3,071,200			3,071,200
Accumulated Depreciation	$ 211,605			211,605
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,071,200
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 211,605
Operating Properties [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Itasca, IL
Encumbrances				0
Initial Cost of Land				1,339,627
Initial Cost of Buildings				3,763,288
Costs Capitalized Subsequent to Acquisition				192,040
Land and Improvements				1,339,627
Building and Improvements				3,955,327
Gross Amount Carried at End of Period	$ 5,294,954			5,294,954
Accumulated Depreciation	$ 427,368			427,368
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,294,954
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 427,368
Operating Properties [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Itasca, IL
Encumbrances				0
Initial Cost of Land				866,378
Initial Cost of Buildings				2,112,616
Costs Capitalized Subsequent to Acquisition				47,808
Land and Improvements				866,378
Building and Improvements				2,160,424
Gross Amount Carried at End of Period	$ 3,026,802			3,026,802
Accumulated Depreciation	$ 210,501			210,501
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,026,802
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 210,501
Operating Properties [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Itasca, IL
Encumbrances				0
Initial Cost of Land				945,251
Initial Cost of Buildings				2,010,181
Costs Capitalized Subsequent to Acquisition				47,379
Land and Improvements				945,251
Building and Improvements				2,057,560
Gross Amount Carried at End of Period	$ 3,002,811			3,002,811
Accumulated Depreciation	$ 197,257			197,257
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,002,811
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 197,257
Operating Properties [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Jessup, MD
Encumbrances				0
Initial Cost of Land				1,246,618
Initial Cost of Buildings				6,844,393
Costs Capitalized Subsequent to Acquisition				1,103,659
Land and Improvements				1,246,618
Building and Improvements				7,948,051
Gross Amount Carried at End of Period	$ 9,194,669			9,194,669
Accumulated Depreciation	$ 805,705			805,705
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,194,669
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 805,705
Operating Properties [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Jessup, MD
Encumbrances				0
Initial Cost of Land				1,488,746
Initial Cost of Buildings				9,072,440
Costs Capitalized Subsequent to Acquisition				1,493,323
Land and Improvements				1,488,746
Building and Improvements				10,565,763
Gross Amount Carried at End of Period	$ 12,054,509			12,054,509
Accumulated Depreciation	$ 1,161,811			1,161,811
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,054,509
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,161,811
Operating Properties [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Jessup, MD
Encumbrances				0
Initial Cost of Land				590,922
Initial Cost of Buildings				3,374,522
Costs Capitalized Subsequent to Acquisition				111,015
Land and Improvements				590,922
Building and Improvements				3,485,537
Gross Amount Carried at End of Period	$ 4,076,459			4,076,459
Accumulated Depreciation	$ 345,762			345,762
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,076,459
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 345,762
Operating Properties [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Kennesaw, GA
Encumbrances				0
Initial Cost of Land				808,159
Initial Cost of Buildings				5,712,959
Costs Capitalized Subsequent to Acquisition				1,051,081
Land and Improvements				808,159
Building and Improvements				6,764,040
Gross Amount Carried at End of Period	$ 7,572,199			7,572,199
Accumulated Depreciation	$ 883,996			883,996
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,572,199
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 883,996
Operating Properties [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Kennesaw, GA
Encumbrances				0
Initial Cost of Land				1,612,924
Initial Cost of Buildings				9,771,680
Costs Capitalized Subsequent to Acquisition				1,534,221
Land and Improvements				1,612,924
Building and Improvements				11,305,901
Gross Amount Carried at End of Period	$ 12,918,825			12,918,825
Accumulated Depreciation	$ 1,682,142			1,682,142
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,918,825
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,682,142
Operating Properties [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Kennesaw, GA
Encumbrances				0
Initial Cost of Land				716,860
Initial Cost of Buildings				6,962,212
Costs Capitalized Subsequent to Acquisition				588,950
Land and Improvements				716,860
Building and Improvements				7,551,163
Gross Amount Carried at End of Period	$ 8,268,023			8,268,023
Accumulated Depreciation	$ 948,932			948,932
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,268,023
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 948,932
Operating Properties [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Kettering, UK
Encumbrances				0
Initial Cost of Land				10,849,890
Initial Cost of Buildings				36,219,855
Costs Capitalized Subsequent to Acquisition				(11,974,257)
Land and Improvements				8,089,744
Building and Improvements				27,005,744
Gross Amount Carried at End of Period	$ 35,095,488			35,095,488
Accumulated Depreciation	$ 2,695,056			2,695,056
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 35,095,488
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,695,056
Operating Properties [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				1,110,111
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				12,306,079
Land and Improvements				1,132,519
Building and Improvements				12,283,671
Gross Amount Carried at End of Period	$ 13,416,190			13,416,190
Accumulated Depreciation	$ 5,489,796			5,489,796
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,416,190
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,489,796
Operating Properties [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				2,370,895
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				15,302,266
Land and Improvements				2,413,514
Building and Improvements				15,259,647
Gross Amount Carried at End of Period	$ 17,673,161			17,673,161
Accumulated Depreciation	$ 7,225,129			7,225,129
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 17,673,161
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 7,225,129
Operating Properties [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				509,580
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,743,070
Land and Improvements				574,152
Building and Improvements				3,678,498
Gross Amount Carried at End of Period	$ 4,252,650			4,252,650
Accumulated Depreciation	$ 1,713,751			1,713,751
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,252,650
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,713,751
Operating Properties [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				1,645,246
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				30,461,859
Land and Improvements				4,581,649
Building and Improvements				27,525,456
Gross Amount Carried at End of Period	$ 32,107,105			32,107,105
Accumulated Depreciation	$ 12,142,198			12,142,198
Date of Construction or Acquisition	2,002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 32,107,105
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 12,142,198
Operating Properties [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				509,580
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,012,278
Land and Improvements				592,886
Building and Improvements				2,928,972
Gross Amount Carried at End of Period	$ 3,521,858			3,521,858
Accumulated Depreciation	$ 1,416,276			1,416,276
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,521,858
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,416,276
Operating Properties [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				1,020,000
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,293,427
Land and Improvements				978,402
Building and Improvements				5,335,025
Gross Amount Carried at End of Period	$ 6,313,427			6,313,427
Accumulated Depreciation	$ 1,766,387			1,766,387
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,313,427
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,766,387
Operating Properties [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				607,210
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,352,052
Land and Improvements				649,792
Building and Improvements				3,309,470
Gross Amount Carried at End of Period	$ 3,959,262			3,959,262
Accumulated Depreciation	$ 1,138,866			1,138,866
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,959,262
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,138,866
Operating Properties [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				764,370
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,489,386
Land and Improvements				867,815
Building and Improvements				3,385,941
Gross Amount Carried at End of Period	$ 4,253,756			4,253,756
Accumulated Depreciation	$ 1,431,193			1,431,193
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,253,756
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,431,193
Operating Properties [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				679,440
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,516,054
Land and Improvements				774,096
Building and Improvements				3,421,398
Gross Amount Carried at End of Period	$ 4,195,494			4,195,494
Accumulated Depreciation	$ 1,756,501			1,756,501
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,195,494
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,756,501
Operating Properties [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				1,191,449
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,476,299
Land and Improvements				946,703
Building and Improvements				2,721,045
Gross Amount Carried at End of Period	$ 3,667,748			3,667,748
Accumulated Depreciation	$ 1,258,265			1,258,265
Date of Construction or Acquisition	1,997
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	$ 1,258,265
Operating Properties [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				601,956
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,455,727
Land and Improvements				611,436
Building and Improvements				2,446,247
Gross Amount Carried at End of Period	$ 3,057,683			3,057,683
Accumulated Depreciation	$ 1,042,209			1,042,209
Date of Construction or Acquisition	1,995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,057,683
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,042,209
Operating Properties [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				928,637
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,471,488
Land and Improvements				1,210,137
Building and Improvements				7,189,988
Gross Amount Carried at End of Period	$ 8,400,125			8,400,125
Accumulated Depreciation	$ 3,257,868			3,257,868
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,400,125
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,257,868
Operating Properties [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				776,496
Initial Cost of Buildings				3,139,068
Costs Capitalized Subsequent to Acquisition				1,724,321
Land and Improvements				776,496
Building and Improvements				4,863,388
Gross Amount Carried at End of Period	$ 5,639,884			5,639,884
Accumulated Depreciation	$ 2,299,839			2,299,839
Date of Construction or Acquisition	1,995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,639,884
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,299,839
Operating Properties [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				1,204,839
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,850,802
Land and Improvements				1,223,875
Building and Improvements				2,831,766
Gross Amount Carried at End of Period	$ 4,055,641			4,055,641
Accumulated Depreciation	$ 1,429,538			1,429,538
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,055,641
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,429,538
Operating Properties [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				236,432
Initial Cost of Buildings				1,856,252
Costs Capitalized Subsequent to Acquisition				820,461
Land and Improvements				236,432
Building and Improvements				2,676,713
Gross Amount Carried at End of Period	$ 2,913,145			2,913,145
Accumulated Depreciation	$ 1,331,021			1,331,021
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,913,145
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,331,021
Operating Properties [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				217,734
Initial Cost of Buildings				1,759,489
Costs Capitalized Subsequent to Acquisition				420,954
Land and Improvements				217,809
Building and Improvements				2,180,368
Gross Amount Carried at End of Period	$ 2,398,177			2,398,177
Accumulated Depreciation	$ 1,151,155			1,151,155
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,398,177
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,151,155
Operating Properties [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				397,178
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,880,505
Land and Improvements				350,874
Building and Improvements				1,926,809
Gross Amount Carried at End of Period	$ 2,277,683			2,277,683
Accumulated Depreciation	$ 1,096,483			1,096,483
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,277,683
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,096,483
Operating Properties [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				717,001
Initial Cost of Buildings				4,816,121
Costs Capitalized Subsequent to Acquisition				2,862,287
Land and Improvements				717,001
Building and Improvements				7,678,408
Gross Amount Carried at End of Period	$ 8,395,409			8,395,409
Accumulated Depreciation	$ 4,371,634			4,371,634
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,395,409
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,371,634
Operating Properties [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				705,317
Initial Cost of Buildings				4,737,487
Costs Capitalized Subsequent to Acquisition				4,307,707
Land and Improvements				705,317
Building and Improvements				9,045,194
Gross Amount Carried at End of Period	$ 9,750,511			9,750,511
Accumulated Depreciation	$ 4,454,376			4,454,376
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,750,511
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,454,376
Operating Properties [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				952,911
Initial Cost of Buildings				6,722,830
Costs Capitalized Subsequent to Acquisition				8,131,184
Land and Improvements				952,911
Building and Improvements				14,854,014
Gross Amount Carried at End of Period	$ 15,806,925			15,806,925
Accumulated Depreciation	$ 7,931,558			7,931,558
Date of Construction or Acquisition	1,971
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 15,806,925
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 7,931,558
Operating Properties [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	King of Prussia, PA
Encumbrances				0
Initial Cost of Land				952,361
Initial Cost of Buildings				6,722,830
Costs Capitalized Subsequent to Acquisition				7,217,277
Land and Improvements				952,361
Building and Improvements				13,940,107
Gross Amount Carried at End of Period	$ 14,892,468			14,892,468
Accumulated Depreciation	$ 7,457,506			7,457,506
Date of Construction or Acquisition	1,971
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	$ 7,457,506
Operating Properties [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lakeland, FL
Encumbrances				0
Initial Cost of Land				650,000
Initial Cost of Buildings				5,444,220
Costs Capitalized Subsequent to Acquisition				0
Land and Improvements				650,000
Building and Improvements				5,444,220
Gross Amount Carried at End of Period	$ 6,094,220			6,094,220
Accumulated Depreciation	$ 608,401			608,401
Date of Construction or Acquisition	2,012
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	$ 608,401
Operating Properties [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Landover,MD
Encumbrances				0
Initial Cost of Land				1,187,620
Initial Cost of Buildings				4,598,346
Costs Capitalized Subsequent to Acquisition				182,789
Land and Improvements				1,187,620
Building and Improvements				4,781,135
Gross Amount Carried at End of Period	$ 5,968,755			5,968,755
Accumulated Depreciation	$ 4,781,135			4,781,135
Date of Construction or Acquisition	2,013
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	$ 4,781,135
Operating Properties [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				975,974
Initial Cost of Buildings				3,409,036
Costs Capitalized Subsequent to Acquisition				100,699
Land and Improvements				977,542
Building and Improvements				3,508,166
Gross Amount Carried at End of Period	$ 4,485,708			4,485,708
Accumulated Depreciation	$ 996,075			996,075
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,485,708
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 996,075
Operating Properties [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				2,561,931
Initial Cost of Buildings				9,695,493
Costs Capitalized Subsequent to Acquisition				272,748
Land and Improvements				2,566,047
Building and Improvements				9,964,125
Gross Amount Carried at End of Period	$ 12,530,172			12,530,172
Accumulated Depreciation	$ 2,686,659			2,686,659
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,530,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,686,659
Operating Properties [Member] | 1701 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				4,063,262
Initial Cost of Buildings				18,719,368
Costs Capitalized Subsequent to Acquisition				132,035
Land and Improvements				4,063,262
Building and Improvements				18,851,403
Gross Amount Carried at End of Period	$ 22,914,665			22,914,665
Accumulated Depreciation	$ 764,225			764,225
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,914,665
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 764,225
Operating Properties [Member] | 1842 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				2,226,284
Initial Cost of Buildings				11,976,185
Costs Capitalized Subsequent to Acquisition				19,270
Land and Improvements				2,226,284
Building and Improvements				11,995,454
Gross Amount Carried at End of Period	$ 14,221,738			14,221,738
Accumulated Depreciation	$ 513,070			513,070
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,221,738
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 513,070
Operating Properties [Member] | 1902 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				2,369,095
Initial Cost of Buildings				14,119,020
Costs Capitalized Subsequent to Acquisition				0
Land and Improvements				2,369,095
Building and Improvements				14,119,020
Gross Amount Carried at End of Period	$ 16,488,115			16,488,115
Accumulated Depreciation	$ 636,966			636,966
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,488,115
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 636,966
Operating Properties [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lebanon,IN
Encumbrances				0
Initial Cost of Land				1,612,787
Initial Cost of Buildings				18,065,552
Costs Capitalized Subsequent to Acquisition				1,215,412
Land and Improvements				1,612,787
Building and Improvements				19,280,964
Gross Amount Carried at End of Period	$ 20,893,751			20,893,751
Accumulated Depreciation	$ 2,283,155			2,283,155
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,893,751
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,283,155
Operating Properties [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lehigh, PA
Encumbrances				0
Initial Cost of Land				893,441
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,643,010
Land and Improvements				779,330
Building and Improvements				5,757,121
Gross Amount Carried at End of Period	$ 6,536,451			6,536,451
Accumulated Depreciation	$ 2,144,171			2,144,171
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,536,451
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,144,171
Operating Properties [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lehigh, PA
Encumbrances				0
Initial Cost of Land				11,249,550
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				48,850,004
Land and Improvements				11,254,716
Building and Improvements				48,844,838
Gross Amount Carried at End of Period	$ 60,099,554			60,099,554
Accumulated Depreciation	$ 12,795,718			12,795,718
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 60,099,554
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 12,795,718
Operating Properties [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lehigh, PA
Encumbrances				663,153
Initial Cost of Land				6,398,815
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				33,734,013
Land and Improvements				11,355,974
Building and Improvements				28,776,854
Gross Amount Carried at End of Period	$ 40,132,828			40,132,828
Accumulated Depreciation	$ 5,185,360			5,185,360
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 40,132,828
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,185,360
Operating Properties [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lithia Springs, GA
Encumbrances				0
Initial Cost of Land				445,493
Initial Cost of Buildings				10,160,616
Costs Capitalized Subsequent to Acquisition				560,063
Land and Improvements				445,493
Building and Improvements				10,720,679
Gross Amount Carried at End of Period	$ 11,166,172			11,166,172
Accumulated Depreciation	$ 1,183,900			1,183,900
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,166,172
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,183,900
Operating Properties [Member] | 8742 Congdon Hill Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lower Macungie, PA
Encumbrances				0
Initial Cost of Land				22,444,500
Initial Cost of Buildings				20,222,582
Costs Capitalized Subsequent to Acquisition				0
Land and Improvements				22,444,500
Building and Improvements				20,222,582
Gross Amount Carried at End of Period	$ 42,667,082			42,667,082
Accumulated Depreciation	$ 118,225			118,225
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 42,667,082
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 118,225
Operating Properties [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Lower Macungie, PA
Encumbrances				0
Initial Cost of Land				5,603,460
Initial Cost of Buildings				18,807,987
Costs Capitalized Subsequent to Acquisition				2,632,563
Land and Improvements				5,603,460
Building and Improvements				21,440,550
Gross Amount Carried at End of Period	$ 27,044,010			27,044,010
Accumulated Depreciation	$ 3,905,673			3,905,673
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 27,044,010
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,905,673
Operating Properties [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				823,540
Initial Cost of Buildings				1,341,376
Costs Capitalized Subsequent to Acquisition				247,936
Land and Improvements				832,244
Building and Improvements				1,580,608
Gross Amount Carried at End of Period	$ 2,412,852			2,412,852
Accumulated Depreciation	$ 1,112,039			1,112,039
Date of Construction or Acquisition	2,003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,412,852
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,112,039
Operating Properties [Member] | 10 Valley Stream Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances				0
Initial Cost of Land				509,075
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,699,241
Land and Improvements				509,899
Building and Improvements				2,698,417
Gross Amount Carried at End of Period	3,208,316			3,208,316
Accumulated Depreciation	$ 1,997,432			1,997,432
Date of Construction or Acquisition	1,984
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	$ 1,997,432
Operating Properties [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				724,058
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,405,657
Land and Improvements				724,846
Building and Improvements				5,404,869
Gross Amount Carried at End of Period	$ 6,129,715			6,129,715
Accumulated Depreciation	$ 3,502,879			3,502,879
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,129,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,502,879
Operating Properties [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				1,320,625
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,509,345
Land and Improvements				1,977,935
Building and Improvements				6,852,035
Gross Amount Carried at End of Period	$ 8,829,970			8,829,970
Accumulated Depreciation	$ 3,796,493			3,796,493
Date of Construction or Acquisition	1,998
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	$ 3,796,493
Operating Properties [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				1,436,814
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				16,828,215
Land and Improvements				1,676,470
Building and Improvements				16,588,559
Gross Amount Carried at End of Period	$ 18,265,029			18,265,029
Accumulated Depreciation	$ 8,745,481			8,745,481
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 18,265,029
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,745,481
Operating Properties [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				496,297
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,931,329
Land and Improvements				708,331
Building and Improvements				1,719,295
Gross Amount Carried at End of Period	$ 2,427,626			2,427,626
Accumulated Depreciation	$ 1,719,295			1,719,295
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,427,626
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,719,295
Operating Properties [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				1,837,050
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,958,472
Land and Improvements				1,837,878
Building and Improvements				14,957,644
Gross Amount Carried at End of Period	$ 16,795,522			16,795,522
Accumulated Depreciation	$ 14,957,645			14,957,645
Date of Construction or Acquisition	1,986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,795,522
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 14,957,645
Operating Properties [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				130,689
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,329,148
Land and Improvements				128,767
Building and Improvements				1,331,070
Gross Amount Carried at End of Period	$ 1,459,837			1,459,837
Accumulated Depreciation	$ 1,110,861			1,110,861
Date of Construction or Acquisition	1,982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,459,837
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,110,861
Operating Properties [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				664,282
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,906,244
Land and Improvements				643,892
Building and Improvements				5,926,634
Gross Amount Carried at End of Period	$ 6,570,526			6,570,526
Accumulated Depreciation	$ 4,101,766			4,101,766
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,570,526
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,101,766
Operating Properties [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				394,036
Initial Cost of Buildings				3,976,221
Costs Capitalized Subsequent to Acquisition				(1,229,407)
Land and Improvements				397,293
Building and Improvements				2,743,557
Gross Amount Carried at End of Period	$ 3,140,850			3,140,850
Accumulated Depreciation	$ 2,743,556			2,743,556
Date of Construction or Acquisition	1,980
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,140,850
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,743,556
Operating Properties [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				495,893
Initial Cost of Buildings				2,739,093
Costs Capitalized Subsequent to Acquisition				698,060
Land and Improvements				812,745
Building and Improvements				3,120,301
Gross Amount Carried at End of Period	$ 3,933,046			3,933,046
Accumulated Depreciation	$ 2,640,096			2,640,096
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,933,046
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,640,096
Operating Properties [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				937,212
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,220,320
Land and Improvements				1,402,795
Building and Improvements				5,754,737
Gross Amount Carried at End of Period	$ 7,157,532			7,157,532
Accumulated Depreciation	$ 3,342,758			3,342,758
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,157,532
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,342,758
Operating Properties [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				397,131
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,710,506
Land and Improvements				397,948
Building and Improvements				2,709,689
Gross Amount Carried at End of Period	$ 3,107,637			3,107,637
Accumulated Depreciation	$ 2,301,566			2,301,566
Date of Construction or Acquisition	1,984
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	$ 2,301,566
Operating Properties [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				3,847,501
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				45,859,328
Land and Improvements				9,953,208
Building and Improvements				39,753,621
Gross Amount Carried at End of Period	$ 49,706,829			49,706,829
Accumulated Depreciation	$ 2,565,627			2,565,627
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 49,706,829
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,565,627
Operating Properties [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				4,380,221
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				15,329,271
Land and Improvements				4,749,748
Building and Improvements				14,959,744
Gross Amount Carried at End of Period	$ 19,709,492			19,709,492
Accumulated Depreciation	$ 8,158,914			8,158,914
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,709,492
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,158,914
Operating Properties [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				849,576
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,101,863
Land and Improvements				1,337,076
Building and Improvements				13,614,363
Gross Amount Carried at End of Period	$ 14,951,439			14,951,439
Accumulated Depreciation	$ 7,454,051			7,454,051
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,951,439
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 7,454,051
Operating Properties [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				472,364
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,162,401
Land and Improvements				762,370
Building and Improvements				2,872,395
Gross Amount Carried at End of Period	$ 3,634,765			3,634,765
Accumulated Depreciation	$ 1,895,859			1,895,859
Date of Construction or Acquisition	1,988
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	$ 1,895,859
Operating Properties [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				865,424
Initial Cost of Buildings				9,285,000
Costs Capitalized Subsequent to Acquisition				5,598,450
Land and Improvements				884,974
Building and Improvements				14,863,900
Gross Amount Carried at End of Period	$ 15,748,874			15,748,874
Accumulated Depreciation	$ 9,949,361			9,949,361
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 15,748,874
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 9,949,361
Operating Properties [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				2,013,750
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,413,146
Land and Improvements				2,798,565
Building and Improvements				8,628,331
Gross Amount Carried at End of Period	$ 11,426,896			11,426,896
Accumulated Depreciation	$ 4,510,096			4,510,096
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,426,896
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,510,096
Operating Properties [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				2,013,750
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,251,414
Land and Improvements				2,785,823
Building and Improvements				8,479,341
Gross Amount Carried at End of Period	$ 11,265,164			11,265,164
Accumulated Depreciation	$ 4,447,650			4,447,650
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,265,164
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,447,650
Operating Properties [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Marietta, GA
Encumbrances				0
Initial Cost of Land				1,232,219
Initial Cost of Buildings				17,897,326
Costs Capitalized Subsequent to Acquisition				437,586
Land and Improvements				1,232,219
Building and Improvements				18,334,912
Gross Amount Carried at End of Period	$ 19,567,131			19,567,131
Accumulated Depreciation	$ 1,835,793			1,835,793
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,567,131
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,835,793
Operating Properties [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Mauldin, SC
Encumbrances				0
Initial Cost of Land				557,174
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,856,370
Land and Improvements				506,318
Building and Improvements				2,907,226
Gross Amount Carried at End of Period	$ 3,413,544			3,413,544
Accumulated Depreciation	$ 922,607			922,607
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,413,544
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 922,607
Operating Properties [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Mauldin, SC
Encumbrances				0
Initial Cost of Land				419,731
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,349,647
Land and Improvements				430,909
Building and Improvements				2,338,469
Gross Amount Carried at End of Period	$ 2,769,378			2,769,378
Accumulated Depreciation	$ 751,363			751,363
Date of Construction or Acquisition	2,003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,769,378
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 751,363
Operating Properties [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	McDonough, GA
Encumbrances				0
Initial Cost of Land				600,666
Initial Cost of Buildings				4,184,131
Costs Capitalized Subsequent to Acquisition				573,223
Land and Improvements				600,666
Building and Improvements				4,757,353
Gross Amount Carried at End of Period	$ 5,358,019			5,358,019
Accumulated Depreciation	$ 788,235			788,235
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,358,019
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 788,235
Operating Properties [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	McDonough, GA
Encumbrances				0
Initial Cost of Land				660,420
Initial Cost of Buildings				4,785,127
Costs Capitalized Subsequent to Acquisition				661,518
Land and Improvements				660,420
Building and Improvements				5,446,645
Gross Amount Carried at End of Period	$ 6,107,065			6,107,065
Accumulated Depreciation	$ 829,134			829,134
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,107,065
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 829,134
Operating Properties [Member] | 11150 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Medley, FL
Encumbrances				0
Initial Cost of Land				6,627,899
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				12,281,367
Land and Improvements				6,627,899
Building and Improvements				12,281,367
Gross Amount Carried at End of Period	$ 18,909,266			18,909,266
Accumulated Depreciation	$ 331,588			331,588
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 18,909,266
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 331,588
Operating Properties [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Medley, FL
Encumbrances				0
Initial Cost of Land				5,558,619
Initial Cost of Buildings				17,678,237
Costs Capitalized Subsequent to Acquisition				1,118,286
Land and Improvements				5,558,619
Building and Improvements				18,796,523
Gross Amount Carried at End of Period	$ 24,355,142			24,355,142
Accumulated Depreciation	$ 2,237,448			2,237,448
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 24,355,142
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,237,448
Operating Properties [Member] | 11450 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Medley, FL
Encumbrances				0
Initial Cost of Land				1,623,293
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				11,424,316
Land and Improvements				3,919,238
Building and Improvements				9,128,371
Gross Amount Carried at End of Period	$ 13,047,609			13,047,609
Accumulated Depreciation	$ 461,030			461,030
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,047,609
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 461,030
Operating Properties [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Minooka, IL
Encumbrances				0
Initial Cost of Land				3,862,683
Initial Cost of Buildings				14,357,981
Costs Capitalized Subsequent to Acquisition				4,591,711
Land and Improvements				3,862,683
Building and Improvements				18,949,692
Gross Amount Carried at End of Period	$ 22,812,375			22,812,375
Accumulated Depreciation	$ 2,034,996			2,034,996
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,812,375
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,034,996
Operating Properties [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Monroe Township, NJ
Encumbrances				0
Initial Cost of Land				2,097,170
Initial Cost of Buildings				9,715,401
Costs Capitalized Subsequent to Acquisition				561,745
Land and Improvements				2,097,170
Building and Improvements				10,277,146
Gross Amount Carried at End of Period	$ 12,374,316			12,374,316
Accumulated Depreciation	$ 1,305,675			1,305,675
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,374,316
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,305,675
Operating Properties [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Monroe Township, NJ
Encumbrances				0
Initial Cost of Land				2,263,153
Initial Cost of Buildings				10,261,759
Costs Capitalized Subsequent to Acquisition				599,026
Land and Improvements				2,263,153
Building and Improvements				10,860,785
Gross Amount Carried at End of Period	$ 13,123,938			13,123,938
Accumulated Depreciation	$ 1,251,816			1,251,816
Date of Construction or Acquisition	2,013
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	$ 1,251,816
Operating Properties [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Moreno Valley, CA
Encumbrances				0
Initial Cost of Land				9,404,283
Initial Cost of Buildings				24,380,934
Costs Capitalized Subsequent to Acquisition				1,851,865
Land and Improvements				9,408,276
Building and Improvements				26,228,806
Gross Amount Carried at End of Period	$ 35,637,082			35,637,082
Accumulated Depreciation	$ 1,802,722			1,802,722
Date of Construction or Acquisition	2,014
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	$ 1,802,722
Operating Properties [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Morrisville, NC
Encumbrances				0
Initial Cost of Land				1,071,600
Initial Cost of Buildings				4,397,807
Costs Capitalized Subsequent to Acquisition				1,029,987
Land and Improvements				1,071,600
Building and Improvements				5,427,794
Gross Amount Carried at End of Period	$ 6,499,394			6,499,394
Accumulated Depreciation	$ 1,341,393			1,341,393
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,499,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,341,393
Operating Properties [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Morrisville, NC
Encumbrances				0
Initial Cost of Land				1,449,092
Initial Cost of Buildings				4,424,932
Costs Capitalized Subsequent to Acquisition				330,260
Land and Improvements				1,449,450
Building and Improvements				4,754,834
Gross Amount Carried at End of Period	$ 6,204,284			6,204,284
Accumulated Depreciation	$ 1,267,257			1,267,257
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,204,284
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,267,257
Operating Properties [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Morrisville, NC
Encumbrances				0
Initial Cost of Land				1,031,430
Initial Cost of Buildings				5,655,167
Costs Capitalized Subsequent to Acquisition				769,286
Land and Improvements				1,031,685
Building and Improvements				6,424,198
Gross Amount Carried at End of Period	$ 7,455,883			7,455,883
Accumulated Depreciation	$ 1,571,097			1,571,097
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,455,883
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,571,097
Operating Properties [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Morrisville, NC
Encumbrances				0
Initial Cost of Land				1,300,889
Initial Cost of Buildings				5,313,226
Costs Capitalized Subsequent to Acquisition				223,184
Land and Improvements				1,301,211
Building and Improvements				5,536,088
Gross Amount Carried at End of Period	$ 6,837,299			6,837,299
Accumulated Depreciation	$ 1,402,290			1,402,290
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,837,299
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,402,290
Operating Properties [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Odenton, MD
Encumbrances				0
Initial Cost of Land				1,976,000
Initial Cost of Buildings				8,099,579
Costs Capitalized Subsequent to Acquisition				2,067,689
Land and Improvements				2,011,030
Building and Improvements				10,132,238
Gross Amount Carried at End of Period	$ 12,143,268			12,143,268
Accumulated Depreciation	$ 3,242,952			3,242,952
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,143,268
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,242,952
Operating Properties [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Odenton, MD
Encumbrances				0
Initial Cost of Land				1,778,400
Initial Cost of Buildings				7,289,165
Costs Capitalized Subsequent to Acquisition				2,081,514
Land and Improvements				1,809,927
Building and Improvements				9,339,152
Gross Amount Carried at End of Period	$ 11,149,079			11,149,079
Accumulated Depreciation	$ 3,023,879			3,023,879
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,149,079
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,023,879
Operating Properties [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Ontario, CA
Encumbrances				0
Initial Cost of Land				2,686,533
Initial Cost of Buildings				10,125,772
Costs Capitalized Subsequent to Acquisition				560,320
Land and Improvements				2,686,533
Building and Improvements				10,686,092
Gross Amount Carried at End of Period	$ 13,372,625			13,372,625
Accumulated Depreciation	$ 1,134,941			1,134,941
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,372,625
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,134,941
Operating Properties [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				415,906
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,826,589
Land and Improvements				435,400
Building and Improvements				2,807,095
Gross Amount Carried at End of Period	$ 3,242,495			3,242,495
Accumulated Depreciation	$ 716,623			716,623
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,242,495
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 716,623
Operating Properties [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				680,312
Initial Cost of Buildings				2,120,754
Costs Capitalized Subsequent to Acquisition				1,406,213
Land and Improvements				680,312
Building and Improvements				3,526,967
Gross Amount Carried at End of Period	$ 4,207,279			4,207,279
Accumulated Depreciation	$ 1,418,449			1,418,449
Date of Construction or Acquisition	2,003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,207,279
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,418,449
Operating Properties [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				517,554
Initial Cost of Buildings				2,568,186
Costs Capitalized Subsequent to Acquisition				699,185
Land and Improvements				522,991
Building and Improvements				3,261,934
Gross Amount Carried at End of Period	$ 3,784,925			3,784,925
Accumulated Depreciation	$ 1,605,946			1,605,946
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,784,925
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,605,946
Operating Properties [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				664,605
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,515,652
Land and Improvements				685,383
Building and Improvements				2,494,874
Gross Amount Carried at End of Period	$ 3,180,257			3,180,257
Accumulated Depreciation	$ 902,836			902,836
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,180,257
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 902,836
Operating Properties [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				878,320
Initial Cost of Buildings				2,558,833
Costs Capitalized Subsequent to Acquisition				3,100,835
Land and Improvements				878,320
Building and Improvements				5,659,668
Gross Amount Carried at End of Period	$ 6,537,988			6,537,988
Accumulated Depreciation	$ 1,344,968			1,344,968
Date of Construction or Acquisition	2,003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,537,988
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,344,968
Operating Properties [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				518,043
Initial Cost of Buildings				2,561,938
Costs Capitalized Subsequent to Acquisition				966,144
Land and Improvements				518,043
Building and Improvements				3,528,082
Gross Amount Carried at End of Period	$ 4,046,125			4,046,125
Accumulated Depreciation	$ 1,767,649			1,767,649
Date of Construction or Acquisition	1,962
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,046,125
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,767,649
Operating Properties [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				523,512
Initial Cost of Buildings				3,191,790
Costs Capitalized Subsequent to Acquisition				1,522,627
Land and Improvements				538,512
Building and Improvements				4,699,417
Gross Amount Carried at End of Period	$ 5,237,929			5,237,929
Accumulated Depreciation	$ 2,237,527			2,237,527
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,237,929
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,237,527
Operating Properties [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				913,201
Initial Cost of Buildings				6,818,610
Costs Capitalized Subsequent to Acquisition				993,299
Land and Improvements				913,201
Building and Improvements				7,811,909
Gross Amount Carried at End of Period	$ 8,725,110			8,725,110
Accumulated Depreciation	$ 872,681			872,681
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,725,110
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 872,681
Operating Properties [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,283,713
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,315,061
Land and Improvements				1,283,713
Building and Improvements				7,315,061
Gross Amount Carried at End of Period	$ 8,598,774			8,598,774
Accumulated Depreciation	$ 2,932,282			2,932,282
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,598,774
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,932,282
Operating Properties [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				838,853
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,084,540
Land and Improvements				767,953
Building and Improvements				4,155,440
Gross Amount Carried at End of Period	$ 4,923,393			4,923,393
Accumulated Depreciation	$ 1,295,463			1,295,463
Date of Construction or Acquisition	2,006
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	$ 1,295,463
Operating Properties [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				467,296
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,856,683
Land and Improvements				825,673
Building and Improvements				2,498,306
Gross Amount Carried at End of Period	$ 3,323,979			3,323,979
Accumulated Depreciation	$ 868,515			868,515
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,323,979
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 868,515
Operating Properties [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				2,261,924
Initial Cost of Buildings				7,496,249
Costs Capitalized Subsequent to Acquisition				2,669,413
Land and Improvements				2,271,785
Building and Improvements				10,155,801
Gross Amount Carried at End of Period	$ 12,427,586			12,427,586
Accumulated Depreciation	$ 3,524,750			3,524,750
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,427,586
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,524,750
Operating Properties [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				385,964
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,218,244
Land and Improvements				642,427
Building and Improvements				2,961,781
Gross Amount Carried at End of Period	$ 3,604,208			3,604,208
Accumulated Depreciation	$ 1,311,061			1,311,061
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,604,208
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,311,061
Operating Properties [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,236,819
Initial Cost of Buildings				3,243,314
Costs Capitalized Subsequent to Acquisition				4,515,655
Land and Improvements				1,244,667
Building and Improvements				7,751,121
Gross Amount Carried at End of Period	$ 8,995,788			8,995,788
Accumulated Depreciation	$ 807,848			807,848
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,995,788
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 807,848
Operating Properties [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				535,964
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,830,045
Land and Improvements				704,800
Building and Improvements				3,661,209
Gross Amount Carried at End of Period	$ 4,366,009			4,366,009
Accumulated Depreciation	$ 1,588,980			1,588,980
Date of Construction or Acquisition	2,002
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,366,009
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,588,980
Operating Properties [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,435,301
Initial Cost of Buildings				6,174,642
Costs Capitalized Subsequent to Acquisition				635,186
Land and Improvements				1,435,301
Building and Improvements				6,809,828
Gross Amount Carried at End of Period	$ 8,245,129			8,245,129
Accumulated Depreciation	$ 1,975,783			1,975,783
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,245,129
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,975,783
Operating Properties [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				903,701
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,673,010
Land and Improvements				925,671
Building and Improvements				5,651,040
Gross Amount Carried at End of Period	$ 6,576,711			6,576,711
Accumulated Depreciation	$ 2,176,452			2,176,452
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,576,711
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,176,452
Operating Properties [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				872,550
Initial Cost of Buildings				2,526,043
Costs Capitalized Subsequent to Acquisition				627,577
Land and Improvements				872,550
Building and Improvements				3,153,620
Gross Amount Carried at End of Period	$ 4,026,170			4,026,170
Accumulated Depreciation	$ 299,246			299,246
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,026,170
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 299,246
Operating Properties [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				903,701
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,792,659
Land and Improvements				830,953
Building and Improvements				3,865,407
Gross Amount Carried at End of Period	$ 4,696,360			4,696,360
Accumulated Depreciation	$ 1,262,732			1,262,732
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,696,360
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,262,732
Operating Properties [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,443,510
Initial Cost of Buildings				6,775,194
Costs Capitalized Subsequent to Acquisition				585,783
Land and Improvements				1,457,286
Building and Improvements				7,347,202
Gross Amount Carried at End of Period	$ 8,804,488			8,804,488
Accumulated Depreciation	$ 1,922,035			1,922,035
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,804,488
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,922,035
Operating Properties [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,431,489
Initial Cost of Buildings				8,002,539
Costs Capitalized Subsequent to Acquisition				799,248
Land and Improvements				1,445,807
Building and Improvements				8,787,469
Gross Amount Carried at End of Period	$ 10,233,276			10,233,276
Accumulated Depreciation	$ 2,397,957			2,397,957
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,233,276
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,397,957
Operating Properties [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,553,537
Initial Cost of Buildings				5,702,243
Costs Capitalized Subsequent to Acquisition				591,287
Land and Improvements				1,570,863
Building and Improvements				6,276,204
Gross Amount Carried at End of Period	$ 7,847,067			7,847,067
Accumulated Depreciation	$ 1,599,823			1,599,823
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,847,067
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,599,823
Operating Properties [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				1,931,697
Initial Cost of Buildings				6,388,203
Costs Capitalized Subsequent to Acquisition				2,903,691
Land and Improvements				1,932,004
Building and Improvements				9,291,587
Gross Amount Carried at End of Period	$ 11,223,591			11,223,591
Accumulated Depreciation	$ 3,677,424			3,677,424
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,223,591
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,677,424
Operating Properties [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				332,992
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,819,927
Land and Improvements				373,500
Building and Improvements				2,779,419
Gross Amount Carried at End of Period	$ 3,152,919			3,152,919
Accumulated Depreciation	$ 678,992			678,992
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,152,919
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 678,992
Operating Properties [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				443,989
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,909,996
Land and Improvements				464,800
Building and Improvements				2,889,185
Gross Amount Carried at End of Period	$ 3,353,985			3,353,985
Accumulated Depreciation	$ 689,162			689,162
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,353,985
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 689,162
Operating Properties [Member] | 29 Liberty Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				165,363
Initial Cost of Buildings				1,139,928
Costs Capitalized Subsequent to Acquisition				(89,307)
Land and Improvements				154,313
Building and Improvements				1,061,670
Gross Amount Carried at End of Period	$ 1,215,983			1,215,983
Accumulated Depreciation	$ 13,602			13,602
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,215,983
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 13,602
Operating Properties [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				574,831
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,682,249
Land and Improvements				587,319
Building and Improvements				2,669,761
Gross Amount Carried at End of Period	$ 3,257,080			3,257,080
Accumulated Depreciation	$ 1,315,038			1,315,038
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,257,080
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,315,038
Operating Properties [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				252,850
Initial Cost of Buildings				1,297,923
Costs Capitalized Subsequent to Acquisition				185,097
Land and Improvements				252,850
Building and Improvements				1,483,020
Gross Amount Carried at End of Period	$ 1,735,870			1,735,870
Accumulated Depreciation	$ 682,906			682,906
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,735,870
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 682,906
Operating Properties [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				405,362
Initial Cost of Buildings				1,146,546
Costs Capitalized Subsequent to Acquisition				417,433
Land and Improvements				405,362
Building and Improvements				1,563,979
Gross Amount Carried at End of Period	$ 1,969,341			1,969,341
Accumulated Depreciation	$ 722,863			722,863
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,969,341
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 722,863
Operating Properties [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				567,280
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,836,673
Land and Improvements				347,892
Building and Improvements				15,056,061
Gross Amount Carried at End of Period	$ 15,403,953			15,403,953
Accumulated Depreciation	$ 4,124,088			4,124,088
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 15,403,953
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,124,088
Operating Properties [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				567,531
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,040,200
Land and Improvements				569,349
Building and Improvements				14,038,382
Gross Amount Carried at End of Period	$ 14,607,731			14,607,731
Accumulated Depreciation	$ 1,779,160			1,779,160
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,607,731
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,779,160
Operating Properties [Member] | 201 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				243,905
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				22,534,911
Land and Improvements				449,013
Building and Improvements				22,329,803
Gross Amount Carried at End of Period	$ 22,778,816			22,778,816
Accumulated Depreciation	$ 1,353,759			1,353,759
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,778,816
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,353,759
Operating Properties [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				214,726
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				22,605,215
Land and Improvements				417,823
Building and Improvements				22,402,118
Gross Amount Carried at End of Period	$ 22,819,941			22,819,941
Accumulated Depreciation	$ 4,108,488			4,108,488
Date of Construction or Acquisition	2,008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,819,941
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,108,488
Operating Properties [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				1,255,507
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,816,115
Land and Improvements				1,142,358
Building and Improvements				10,929,264
Gross Amount Carried at End of Period	$ 12,071,622			12,071,622
Accumulated Depreciation	$ 407,471			407,471
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,071,622
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 407,471
Operating Properties [Member] | 4020 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				51,784
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,165,151
Land and Improvements				616,467
Building and Improvements				6,600,468
Gross Amount Carried at End of Period	$ 7,216,935			7,216,935
Accumulated Depreciation	$ 836,575			836,575
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,216,935
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 836,575
Operating Properties [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				46,301
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,163,875
Land and Improvements				616,670
Building and Improvements				6,593,506
Gross Amount Carried at End of Period	$ 7,210,176			7,210,176
Accumulated Depreciation	$ 1,030,380			1,030,380
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,210,176
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,030,380
Operating Properties [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				402,673
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				34,854,173
Land and Improvements				413,030
Building and Improvements				34,843,816
Gross Amount Carried at End of Period	$ 35,256,846			35,256,846
Accumulated Depreciation	$ 6,615,001			6,615,001
Date of Construction or Acquisition	2,008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 35,256,846
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,615,001
Operating Properties [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				992,965
Initial Cost of Buildings				331,924
Costs Capitalized Subsequent to Acquisition				7,806,820
Land and Improvements				613,248
Building and Improvements				8,518,461
Gross Amount Carried at End of Period	$ 9,131,709			9,131,709
Accumulated Depreciation	$ 2,930,840			2,930,840
Date of Construction or Acquisition	2,003
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,131,709
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,930,840
Operating Properties [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				891,892
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,578,804
Land and Improvements				366,982
Building and Improvements				6,103,714
Gross Amount Carried at End of Period	$ 6,470,696			6,470,696
Accumulated Depreciation	$ 1,468,939			1,468,939
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,470,696
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,468,939
Operating Properties [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				1,765,341
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				75,231,724
Land and Improvements				1,897,303
Building and Improvements				75,099,762
Gross Amount Carried at End of Period	$ 76,997,065			76,997,065
Accumulated Depreciation	$ 8,129,695			8,129,695
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 76,997,065
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 8,129,695
Operating Properties [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				40,061,756
Initial Cost of Land				734,275
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				45,366,959
Land and Improvements				0
Building and Improvements				46,101,234
Gross Amount Carried at End of Period	$ 46,101,234			46,101,234
Accumulated Depreciation	$ 3,468,952			3,468,952
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 46,101,234
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,468,952
Operating Properties [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Phoenix, AZ
Encumbrances				0
Initial Cost of Land				2,519,510
Initial Cost of Buildings				3,798,560
Costs Capitalized Subsequent to Acquisition				3,444,729
Land and Improvements				2,519,510
Building and Improvements				7,243,289
Gross Amount Carried at End of Period	$ 9,762,799			9,762,799
Accumulated Depreciation	$ 1,365,742			1,365,742
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,762,799
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,365,742
Operating Properties [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Phoenix, AZ
Encumbrances				0
Initial Cost of Land				5,523,427
Initial Cost of Buildings				14,581,705
Costs Capitalized Subsequent to Acquisition				12,199,604
Land and Improvements				5,636,070
Building and Improvements				26,668,666
Gross Amount Carried at End of Period	$ 32,304,736			32,304,736
Accumulated Depreciation	$ 2,283,003			2,283,003
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 32,304,736
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,283,003
Operating Properties [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				706,660
Initial Cost of Buildings				5,894,330
Costs Capitalized Subsequent to Acquisition				258,628
Land and Improvements				706,660
Building and Improvements				6,152,959
Gross Amount Carried at End of Period	$ 6,859,619			6,859,619
Accumulated Depreciation	$ 679,107			679,107
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,859,619
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 679,107
Operating Properties [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				555,168
Initial Cost of Buildings				6,401,789
Costs Capitalized Subsequent to Acquisition				482,432
Land and Improvements				555,168
Building and Improvements				6,884,221
Gross Amount Carried at End of Period	$ 7,439,389			7,439,389
Accumulated Depreciation	$ 816,759			816,759
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,439,389
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 816,759
Operating Properties [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				551,706
Initial Cost of Buildings				5,797,440
Costs Capitalized Subsequent to Acquisition				259,807
Land and Improvements				551,706
Building and Improvements				6,057,247
Gross Amount Carried at End of Period	$ 6,608,953			6,608,953
Accumulated Depreciation	$ 673,886			673,886
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,608,953
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 673,886
Operating Properties [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				1,047,996
Initial Cost of Buildings				9,218,748
Costs Capitalized Subsequent to Acquisition				1,970,078
Land and Improvements				1,047,996
Building and Improvements				11,188,825
Gross Amount Carried at End of Period	$ 12,236,821			12,236,821
Accumulated Depreciation	$ 1,304,882			1,304,882
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,236,821
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,304,882
Operating Properties [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				877,564
Initial Cost of Buildings				7,460,686
Costs Capitalized Subsequent to Acquisition				788,731
Land and Improvements				877,564
Building and Improvements				8,249,416
Gross Amount Carried at End of Period	$ 9,126,980			9,126,980
Accumulated Depreciation	$ 855,019			855,019
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,126,980
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 855,019
Operating Properties [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				580,456
Initial Cost of Buildings				5,681,283
Costs Capitalized Subsequent to Acquisition				271,634
Land and Improvements				580,456
Building and Improvements				5,952,917
Gross Amount Carried at End of Period	$ 6,533,373			6,533,373
Accumulated Depreciation	$ 648,375			648,375
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,533,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 648,375
Operating Properties [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plano, TX
Encumbrances				0
Initial Cost of Land				723,534
Initial Cost of Buildings				6,004,923
Costs Capitalized Subsequent to Acquisition				352,138
Land and Improvements				723,534
Building and Improvements				6,357,061
Gross Amount Carried at End of Period	$ 7,080,595			7,080,595
Accumulated Depreciation	$ 755,534			755,534
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,080,595
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 755,534
Operating Properties [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pleasant Prairie, WI
Encumbrances				0
Initial Cost of Land				1,692,077
Initial Cost of Buildings				7,934,794
Costs Capitalized Subsequent to Acquisition				58,274
Land and Improvements				1,689,726
Building and Improvements				7,995,419
Gross Amount Carried at End of Period	$ 9,685,145			9,685,145
Accumulated Depreciation	$ 3,607,080			3,607,080
Date of Construction or Acquisition	1,994
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,685,145
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,607,080
Operating Properties [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plymouth, MN
Encumbrances				0
Initial Cost of Land				198,205
Initial Cost of Buildings				1,793,422
Costs Capitalized Subsequent to Acquisition				1,096,872
Land and Improvements				198,205
Building and Improvements				2,890,293
Gross Amount Carried at End of Period	$ 3,088,498			3,088,498
Accumulated Depreciation	$ 1,386,033			1,386,033
Date of Construction or Acquisition	1,978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,088,498
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,386,033
Operating Properties [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plymouth, MN
Encumbrances				0
Initial Cost of Land				392,026
Initial Cost of Buildings				3,433,678
Costs Capitalized Subsequent to Acquisition				702,745
Land and Improvements				384,235
Building and Improvements				4,144,214
Gross Amount Carried at End of Period	$ 4,528,449			4,528,449
Accumulated Depreciation	$ 1,929,556			1,929,556
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,528,449
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,929,556
Operating Properties [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plymouth, MN
Encumbrances				0
Initial Cost of Land				1,616,360
Initial Cost of Buildings				4,487,462
Costs Capitalized Subsequent to Acquisition				735,223
Land and Improvements				1,616,360
Building and Improvements				5,222,684
Gross Amount Carried at End of Period	$ 6,839,044			6,839,044
Accumulated Depreciation	$ 651,727			651,727
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,839,044
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 651,727
Operating Properties [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Plymouth, MN
Encumbrances				0
Initial Cost of Land				1,327,017
Initial Cost of Buildings				4,527,404
Costs Capitalized Subsequent to Acquisition				580,333
Land and Improvements				1,327,017
Building and Improvements				5,107,737
Gross Amount Carried at End of Period	$ 6,434,754			6,434,754
Accumulated Depreciation	$ 625,825			625,825
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,434,754
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 625,825
Operating Properties [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,157,049
Initial Cost of Buildings				4,620,956
Costs Capitalized Subsequent to Acquisition				1,339,780
Land and Improvements				1,157,049
Building and Improvements				5,960,736
Gross Amount Carried at End of Period	$ 7,117,785			7,117,785
Accumulated Depreciation	$ 2,761,606			2,761,606
Date of Construction or Acquisition	1,986
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,117,785
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,761,606
Operating Properties [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				392,138
Initial Cost of Buildings				1,565,787
Costs Capitalized Subsequent to Acquisition				435,867
Land and Improvements				392,138
Building and Improvements				2,001,655
Gross Amount Carried at End of Period	$ 2,393,793			2,393,793
Accumulated Depreciation	$ 982,366			982,366
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,393,793
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 982,366
Operating Properties [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				972,232
Initial Cost of Buildings				3,892,085
Costs Capitalized Subsequent to Acquisition				912,017
Land and Improvements				972,232
Building and Improvements				4,804,102
Gross Amount Carried at End of Period	$ 5,776,334			5,776,334
Accumulated Depreciation	$ 2,244,165			2,244,165
Date of Construction or Acquisition	1,957
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,776,334
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,244,165
Operating Properties [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				203,247
Initial Cost of Buildings				811,093
Costs Capitalized Subsequent to Acquisition				368,976
Land and Improvements				203,247
Building and Improvements				1,180,070
Gross Amount Carried at End of Period	$ 1,383,317			1,383,317
Accumulated Depreciation	$ 560,603			560,603
Date of Construction or Acquisition	1,990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,383,317
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 560,603
Operating Properties [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				203,247
Initial Cost of Buildings				811,093
Costs Capitalized Subsequent to Acquisition				208,224
Land and Improvements				203,247
Building and Improvements				1,019,318
Gross Amount Carried at End of Period	$ 1,222,565			1,222,565
Accumulated Depreciation	$ 444,758			444,758
Date of Construction or Acquisition	1,990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,222,565
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 444,758
Operating Properties [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				203,247
Initial Cost of Buildings				811,093
Costs Capitalized Subsequent to Acquisition				154,435
Land and Improvements				203,247
Building and Improvements				965,529
Gross Amount Carried at End of Period	$ 1,168,776			1,168,776
Accumulated Depreciation	$ 417,118			417,118
Date of Construction or Acquisition	1,990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,168,776
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 417,118
Operating Properties [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,120,328
Initial Cost of Buildings				3,427,358
Costs Capitalized Subsequent to Acquisition				135,753
Land and Improvements				1,120,328
Building and Improvements				3,563,111
Gross Amount Carried at End of Period	$ 4,683,439			4,683,439
Accumulated Depreciation	$ 369,499			369,499
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,683,439
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 369,499
Operating Properties [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				993,015
Initial Cost of Buildings				2,423,174
Costs Capitalized Subsequent to Acquisition				132,660
Land and Improvements				993,015
Building and Improvements				2,555,834
Gross Amount Carried at End of Period	$ 3,548,849			3,548,849
Accumulated Depreciation	$ 289,550			289,550
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,548,849
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 289,550
Operating Properties [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				906,947
Initial Cost of Buildings				2,157,802
Costs Capitalized Subsequent to Acquisition				181,920
Land and Improvements				906,947
Building and Improvements				2,339,723
Gross Amount Carried at End of Period	$ 3,246,670			3,246,670
Accumulated Depreciation	$ 289,360			289,360
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,246,670
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 289,360
Operating Properties [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,268,707
Initial Cost of Buildings				3,079,811
Costs Capitalized Subsequent to Acquisition				146,245
Land and Improvements				1,268,707
Building and Improvements				3,226,056
Gross Amount Carried at End of Period	$ 4,494,763			4,494,763
Accumulated Depreciation	$ 364,496			364,496
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,494,763
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 364,496
Operating Properties [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,087,554
Initial Cost of Buildings				2,897,117
Costs Capitalized Subsequent to Acquisition				147,218
Land and Improvements				1,087,554
Building and Improvements				3,044,335
Gross Amount Carried at End of Period	$ 4,131,889			4,131,889
Accumulated Depreciation	$ 357,215			357,215
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,131,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 357,215
Operating Properties [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,548,542
Initial Cost of Buildings				3,512,041
Costs Capitalized Subsequent to Acquisition				322,677
Land and Improvements				1,548,542
Building and Improvements				3,834,719
Gross Amount Carried at End of Period	$ 5,383,261			5,383,261
Accumulated Depreciation	$ 513,606			513,606
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,383,261
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 513,606
Operating Properties [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				1,112,781
Initial Cost of Buildings				2,763,862
Costs Capitalized Subsequent to Acquisition				232,584
Land and Improvements				1,112,781
Building and Improvements				2,996,445
Gross Amount Carried at End of Period	$ 4,109,226			4,109,226
Accumulated Depreciation	$ 385,453			385,453
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,109,226
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 385,453
Operating Properties [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				359,933
Initial Cost of Buildings				1,437,116
Costs Capitalized Subsequent to Acquisition				720,249
Land and Improvements				359,933
Building and Improvements				2,157,365
Gross Amount Carried at End of Period	$ 2,517,298			2,517,298
Accumulated Depreciation	$ 1,176,745			1,176,745
Date of Construction or Acquisition	1,984
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	$ 1,176,745
Operating Properties [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				164,413
Initial Cost of Buildings				655,933
Costs Capitalized Subsequent to Acquisition				279,326
Land and Improvements				164,413
Building and Improvements				935,259
Gross Amount Carried at End of Period	$ 1,099,672			1,099,672
Accumulated Depreciation	$ 513,909			513,909
Date of Construction or Acquisition	1,984
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	$ 513,909
Operating Properties [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Pompano Beach, FL
Encumbrances				0
Initial Cost of Land				310,778
Initial Cost of Buildings				1,238,324
Costs Capitalized Subsequent to Acquisition				294,844
Land and Improvements				310,178
Building and Improvements				1,533,768
Gross Amount Carried at End of Period	$ 1,843,946			1,843,946
Accumulated Depreciation	$ 626,437			626,437
Date of Construction or Acquisition	1,965
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,843,946
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 626,437
Operating Properties [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rialto, CA
Encumbrances				0
Initial Cost of Land				9,361,943
Initial Cost of Buildings				17,970,709
Costs Capitalized Subsequent to Acquisition				453,128
Land and Improvements				9,411,621
Building and Improvements				18,374,159
Gross Amount Carried at End of Period	$ 27,785,780			27,785,780
Accumulated Depreciation	$ 971,239			971,239
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 27,785,780
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 971,239
Operating Properties [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				659,456
Initial Cost of Buildings				4,836,010
Costs Capitalized Subsequent to Acquisition				159,898
Land and Improvements				659,456
Building and Improvements				4,995,908
Gross Amount Carried at End of Period	$ 5,655,364			5,655,364
Accumulated Depreciation	$ 2,759,090			2,759,090
Date of Construction or Acquisition	1,989
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	$ 2,759,090
Operating Properties [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				310,854
Initial Cost of Buildings				2,279,597
Costs Capitalized Subsequent to Acquisition				1,895,397
Land and Improvements				310,854
Building and Improvements				4,174,994
Gross Amount Carried at End of Period	$ 4,485,848			4,485,848
Accumulated Depreciation	$ 1,765,252			1,765,252
Date of Construction or Acquisition	1,973
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,485,848
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,765,252
Operating Properties [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				693,203
Initial Cost of Buildings				5,083,493
Costs Capitalized Subsequent to Acquisition				2,058,719
Land and Improvements				693,203
Building and Improvements				7,142,212
Gross Amount Carried at End of Period	$ 7,835,415			7,835,415
Accumulated Depreciation	$ 4,003,398			4,003,398
Date of Construction or Acquisition	1,975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,835,415
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 4,003,398
Operating Properties [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				256,203
Initial Cost of Buildings				2,549,649
Costs Capitalized Subsequent to Acquisition				3,008,422
Land and Improvements				256,203
Building and Improvements				5,558,071
Gross Amount Carried at End of Period	$ 5,814,274			5,814,274
Accumulated Depreciation	$ 2,601,653			2,601,653
Date of Construction or Acquisition	1,976
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,814,274
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,601,653
Operating Properties [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				91,476
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,911,959
Land and Improvements				91,599
Building and Improvements				1,911,836
Gross Amount Carried at End of Period	$ 2,003,435			2,003,435
Accumulated Depreciation	$ 1,008,379			1,008,379
Date of Construction or Acquisition	1,975
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,003,435
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,008,379
Operating Properties [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				223,696
Initial Cost of Buildings				1,640,435
Costs Capitalized Subsequent to Acquisition				3,048,884
Land and Improvements				223,696
Building and Improvements				4,689,319
Gross Amount Carried at End of Period	$ 4,913,015			4,913,015
Accumulated Depreciation	$ 2,044,300			2,044,300
Date of Construction or Acquisition	1,978
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,913,015
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,044,300
Operating Properties [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				325,303
Initial Cost of Buildings				2,385,557
Costs Capitalized Subsequent to Acquisition				1,375,855
Land and Improvements				325,303
Building and Improvements				3,761,412
Gross Amount Carried at End of Period	$ 4,086,715			4,086,715
Accumulated Depreciation	$ 1,774,030			1,774,030
Date of Construction or Acquisition	1,979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,086,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,774,030
Operating Properties [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				615,038
Initial Cost of Buildings				4,510,272
Costs Capitalized Subsequent to Acquisition				484,686
Land and Improvements				615,038
Building and Improvements				4,994,958
Gross Amount Carried at End of Period	$ 5,609,996			5,609,996
Accumulated Depreciation	$ 2,755,220			2,755,220
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,609,996
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,755,220
Operating Properties [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				454,056
Initial Cost of Buildings				2,729,742
Costs Capitalized Subsequent to Acquisition				514,146
Land and Improvements				454,056
Building and Improvements				3,243,888
Gross Amount Carried at End of Period	$ 3,697,944			3,697,944
Accumulated Depreciation	$ 1,861,413			1,861,413
Date of Construction or Acquisition	1,987
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,697,944
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,861,413
Operating Properties [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				486,166
Initial Cost of Buildings				3,565,211
Costs Capitalized Subsequent to Acquisition				576,623
Land and Improvements				486,166
Building and Improvements				4,141,834
Gross Amount Carried at End of Period	$ 4,628,000			4,628,000
Accumulated Depreciation	$ 2,282,791			2,282,791
Date of Construction or Acquisition	1,981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,628,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,282,791
Operating Properties [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				474,360
Initial Cost of Buildings				3,478,646
Costs Capitalized Subsequent to Acquisition				1,015,357
Land and Improvements				474,360
Building and Improvements				4,494,003
Gross Amount Carried at End of Period	$ 4,968,363			4,968,363
Accumulated Depreciation	$ 2,651,489			2,651,489
Date of Construction or Acquisition	1,982
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,968,363
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,651,489
Operating Properties [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				652,455
Initial Cost of Buildings				4,784,675
Costs Capitalized Subsequent to Acquisition				841,192
Land and Improvements				652,455
Building and Improvements				5,625,867
Gross Amount Carried at End of Period	$ 6,278,322			6,278,322
Accumulated Depreciation	$ 3,287,659			3,287,659
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,278,322
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,287,659
Operating Properties [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				404,616
Initial Cost of Buildings				2,967,187
Costs Capitalized Subsequent to Acquisition				662,014
Land and Improvements				404,616
Building and Improvements				3,629,201
Gross Amount Carried at End of Period	$ 4,033,817			4,033,817
Accumulated Depreciation	$ 1,974,801			1,974,801
Date of Construction or Acquisition	1,985
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,033,817
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,974,801
Operating Properties [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				449,447
Initial Cost of Buildings				3,294,697
Costs Capitalized Subsequent to Acquisition				2,230,770
Land and Improvements				452,263
Building and Improvements				5,522,651
Gross Amount Carried at End of Period	$ 5,974,914			5,974,914
Accumulated Depreciation	$ 2,938,959			2,938,959
Date of Construction or Acquisition	1,978
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	$ 2,938,959
Operating Properties [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				261,961
Initial Cost of Buildings				2,110,874
Costs Capitalized Subsequent to Acquisition				414,799
Land and Improvements				262,210
Building and Improvements				2,525,424
Gross Amount Carried at End of Period	$ 2,787,634			2,787,634
Accumulated Depreciation	$ 1,372,360			1,372,360
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,787,634
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,372,360
Operating Properties [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				486,118
Initial Cost of Buildings				4,083,582
Costs Capitalized Subsequent to Acquisition				716,388
Land and Improvements				486,598
Building and Improvements				4,799,490
Gross Amount Carried at End of Period	$ 5,286,088			5,286,088
Accumulated Depreciation	$ 2,343,100			2,343,100
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,286,088
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,343,100
Operating Properties [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				266,883
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,621,284
Land and Improvements				334,772
Building and Improvements				2,553,395
Gross Amount Carried at End of Period	$ 2,888,167			2,888,167
Accumulated Depreciation	$ 1,267,264			1,267,264
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,888,167
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,267,264
Operating Properties [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				742,300
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,428,026
Land and Improvements				1,066,839
Building and Improvements				5,103,487
Gross Amount Carried at End of Period	$ 6,170,326			6,170,326
Accumulated Depreciation	$ 1,155,273			1,155,273
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,170,326
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,155,273
Operating Properties [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				489,941
Initial Cost of Buildings				3,592,900
Costs Capitalized Subsequent to Acquisition				634,581
Land and Improvements				489,941
Building and Improvements				4,227,481
Gross Amount Carried at End of Period	$ 4,717,422			4,717,422
Accumulated Depreciation	$ 2,161,964			2,161,964
Date of Construction or Acquisition	1,989
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,717,422
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,161,964
Operating Properties [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				705,660
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,741,770
Land and Improvements				720,100
Building and Improvements				4,727,330
Gross Amount Carried at End of Period	$ 5,447,430			5,447,430
Accumulated Depreciation	$ 2,498,179			2,498,179
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,447,430
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,498,179
Operating Properties [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				644,384
Initial Cost of Buildings				4,025,480
Costs Capitalized Subsequent to Acquisition				353,257
Land and Improvements				644,384
Building and Improvements				4,378,737
Gross Amount Carried at End of Period	$ 5,023,121			5,023,121
Accumulated Depreciation	$ 2,442,189			2,442,189
Date of Construction or Acquisition	1,990
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	$ 2,442,189
Operating Properties [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				408,729
Initial Cost of Buildings				2,697,348
Costs Capitalized Subsequent to Acquisition				1,248,269
Land and Improvements				408,729
Building and Improvements				3,945,617
Gross Amount Carried at End of Period	$ 4,354,346			4,354,346
Accumulated Depreciation	$ 2,191,052			2,191,052
Date of Construction or Acquisition	1,990
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,354,346
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,191,052
Operating Properties [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				694,644
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,979,622
Land and Improvements				700,503
Building and Improvements				5,973,763
Gross Amount Carried at End of Period	$ 6,674,266			6,674,266
Accumulated Depreciation	$ 2,733,261			2,733,261
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,674,266
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,733,261
Operating Properties [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				676,661
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,998,722
Land and Improvements				687,898
Building and Improvements				4,987,485
Gross Amount Carried at End of Period	$ 5,675,383			5,675,383
Accumulated Depreciation	$ 2,620,834			2,620,834
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,675,383
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,620,834
Operating Properties [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				872,901
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,490,092
Land and Improvements				901,666
Building and Improvements				7,461,327
Gross Amount Carried at End of Period	$ 8,362,993			8,362,993
Accumulated Depreciation	$ 1,654,411			1,654,411
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,362,993
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,654,411
Operating Properties [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rock Creek, NC
Encumbrances				0
Initial Cost of Land				305,821
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,966,941
Land and Improvements				335,061
Building and Improvements				4,937,701
Gross Amount Carried at End of Period	$ 5,272,762			5,272,762
Accumulated Depreciation	$ 2,292,064			2,292,064
Date of Construction or Acquisition	1,999
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,272,762
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,292,064
Operating Properties [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rock Creek, NC
Encumbrances				0
Initial Cost of Land				354,903
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,029,022
Land and Improvements				399,988
Building and Improvements				3,983,937
Gross Amount Carried at End of Period	$ 4,383,925			4,383,925
Accumulated Depreciation	$ 2,005,118			2,005,118
Date of Construction or Acquisition	1,997
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,383,925
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,005,118
Operating Properties [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rogers, MN
Encumbrances				0
Initial Cost of Land				895,811
Initial Cost of Buildings				6,004,189
Costs Capitalized Subsequent to Acquisition				342,255
Land and Improvements				895,811
Building and Improvements				6,346,444
Gross Amount Carried at End of Period	$ 7,242,255			7,242,255
Accumulated Depreciation	$ 948,850			948,850
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,242,255
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 948,850
Operating Properties [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rogers, MN
Encumbrances				0
Initial Cost of Land				508,532
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				11,072,977
Land and Improvements				1,396,324
Building and Improvements				10,185,185
Gross Amount Carried at End of Period	$ 11,581,509			11,581,509
Accumulated Depreciation	$ 853,976			853,976
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,581,509
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 853,976
Operating Properties [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Rogers, MN
Encumbrances				0
Initial Cost of Land				1,048,093
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,464,170
Land and Improvements				1,066,159
Building and Improvements				10,446,104
Gross Amount Carried at End of Period	$ 11,512,263			11,512,263
Accumulated Depreciation	$ 786,204			786,204
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,512,263
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 786,204
Operating Properties [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Romeoville, IL
Encumbrances				0
Initial Cost of Land				8,672,143
Initial Cost of Buildings				24,144,864
Costs Capitalized Subsequent to Acquisition				1,238,550
Land and Improvements				8,672,143
Building and Improvements				25,383,414
Gross Amount Carried at End of Period	$ 34,055,557			34,055,557
Accumulated Depreciation	$ 2,699,591			2,699,591
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 34,055,557
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,699,591
Operating Properties [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Roselle, IL
Encumbrances				0
Initial Cost of Land				2,884,492
Initial Cost of Buildings				10,439,793
Costs Capitalized Subsequent to Acquisition				485,780
Land and Improvements				2,884,492
Building and Improvements				10,925,573
Gross Amount Carried at End of Period	$ 13,810,065			13,810,065
Accumulated Depreciation	$ 1,361,718			1,361,718
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,810,065
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,361,718
Operating Properties [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	San Fernando, CA
Encumbrances				0
Initial Cost of Land				3,035,034
Initial Cost of Buildings				2,844,962
Costs Capitalized Subsequent to Acquisition				460,618
Land and Improvements				3,035,034
Building and Improvements				3,305,580
Gross Amount Carried at End of Period	$ 6,340,614			6,340,614
Accumulated Depreciation	$ 392,642			392,642
Date of Construction or Acquisition	2,013
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	$ 392,642
Operating Properties [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Savage, MD
Encumbrances				0
Initial Cost of Land				1,263,237
Initial Cost of Buildings				2,633,210
Costs Capitalized Subsequent to Acquisition				206,384
Land and Improvements				1,263,237
Building and Improvements				2,839,594
Gross Amount Carried at End of Period	$ 4,102,831			4,102,831
Accumulated Depreciation	$ 311,576			311,576
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,102,831
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 311,576
Operating Properties [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Scottsdale, AZ
Encumbrances				0
Initial Cost of Land				4,076,412
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				27,621,159
Land and Improvements				4,115,137
Building and Improvements				27,582,434
Gross Amount Carried at End of Period	$ 31,697,571			31,697,571
Accumulated Depreciation	$ 9,367,899			9,367,899
Date of Construction or Acquisition	2,005
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	$ 9,367,899
Operating Properties [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Shakopee, MN
Encumbrances				0
Initial Cost of Land				1,126,865
Initial Cost of Buildings				5,684,178
Costs Capitalized Subsequent to Acquisition				7,627
Land and Improvements				1,126,865
Building and Improvements				5,691,805
Gross Amount Carried at End of Period	$ 6,818,670			6,818,670
Accumulated Depreciation	$ 627,756			627,756
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,818,670
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 627,756
Operating Properties [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Shakopee, MN
Encumbrances				0
Initial Cost of Land				887,285
Initial Cost of Buildings				5,321,200
Costs Capitalized Subsequent to Acquisition				428,118
Land and Improvements				887,285
Building and Improvements				5,749,318
Gross Amount Carried at End of Period	$ 6,636,603			6,636,603
Accumulated Depreciation	$ 739,623			739,623
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,636,603
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 739,623
Operating Properties [Member] | 5651 Innovation Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Shakopee, MN
Encumbrances				0
Initial Cost of Land				1,551,579
Initial Cost of Buildings				9,541,234
Costs Capitalized Subsequent to Acquisition				1,143,179
Land and Improvements				1,552,083
Building and Improvements				10,683,909
Gross Amount Carried at End of Period	$ 12,235,992			12,235,992
Accumulated Depreciation	$ 320,481			320,481
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,235,992
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 320,481
Operating Properties [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Sharonville, OH
Encumbrances				0
Initial Cost of Land				1,337,271
Initial Cost of Buildings				6,135,118
Costs Capitalized Subsequent to Acquisition				1,053,414
Land and Improvements				1,337,271
Building and Improvements				7,188,533
Gross Amount Carried at End of Period	$ 8,525,804			8,525,804
Accumulated Depreciation	$ 1,180,732			1,180,732
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,525,804
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,180,732
Operating Properties [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Shippensburg, PA
Encumbrances				0
Initial Cost of Land				10,232,633
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				84,537,189
Land and Improvements				12,933,027
Building and Improvements				81,836,795
Gross Amount Carried at End of Period	$ 94,769,822			94,769,822
Accumulated Depreciation	$ 5,969,153			5,969,153
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 94,769,822
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 5,969,153
Operating Properties [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Simi Valley, CA
Encumbrances				0
Initial Cost of Land				1,964,140
Initial Cost of Buildings				10,667,267
Costs Capitalized Subsequent to Acquisition				332,505
Land and Improvements				1,964,140
Building and Improvements				10,999,772
Gross Amount Carried at End of Period	$ 12,963,912			12,963,912
Accumulated Depreciation	$ 1,106,485			1,106,485
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,963,912
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,106,485
Operating Properties [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Charles, IL
Encumbrances				0
Initial Cost of Land				643,639
Initial Cost of Buildings				1,645,058
Costs Capitalized Subsequent to Acquisition				149,732
Land and Improvements				643,639
Building and Improvements				1,794,790
Gross Amount Carried at End of Period	$ 2,438,429			2,438,429
Accumulated Depreciation	$ 233,225			233,225
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,438,429
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 233,225
Operating Properties [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Charles, IL
Encumbrances				0
Initial Cost of Land				672,500
Initial Cost of Buildings				1,288,924
Costs Capitalized Subsequent to Acquisition				135,971
Land and Improvements				672,500
Building and Improvements				1,424,895
Gross Amount Carried at End of Period	$ 2,097,395			2,097,395
Accumulated Depreciation	$ 178,406			178,406
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,097,395
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 178,406
Operating Properties [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Charles, IL
Encumbrances				0
Initial Cost of Land				851,080
Initial Cost of Buildings				3,027,753
Costs Capitalized Subsequent to Acquisition				193,980
Land and Improvements				851,080
Building and Improvements				3,221,733
Gross Amount Carried at End of Period	$ 4,072,813			4,072,813
Accumulated Depreciation	$ 380,779			380,779
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,072,813
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 380,779
Operating Properties [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Petersburg, FL
Encumbrances				0
Initial Cost of Land				283,474
Initial Cost of Buildings				2,230,868
Costs Capitalized Subsequent to Acquisition				165,205
Land and Improvements				283,474
Building and Improvements				2,396,072
Gross Amount Carried at End of Period	$ 2,679,546			2,679,546
Accumulated Depreciation	$ 264,247			264,247
Date of Construction or Acquisition	2,013
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	$ 264,247
Operating Properties [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Petersburg, FL
Encumbrances				0
Initial Cost of Land				374,284
Initial Cost of Buildings				2,987,226
Costs Capitalized Subsequent to Acquisition				220,944
Land and Improvements				374,284
Building and Improvements				3,208,170
Gross Amount Carried at End of Period	$ 3,582,454			3,582,454
Accumulated Depreciation	$ 351,694			351,694
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,582,454
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 351,694
Operating Properties [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	St. Petersburg, FL
Encumbrances				0
Initial Cost of Land				699,797
Initial Cost of Buildings				5,214,438
Costs Capitalized Subsequent to Acquisition				1,045,906
Land and Improvements				699,797
Building and Improvements				6,260,344
Gross Amount Carried at End of Period	$ 6,960,141			6,960,141
Accumulated Depreciation	$ 695,362			695,362
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,960,141
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 695,362
Operating Properties [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Suffolk, VA
Encumbrances				0
Initial Cost of Land				904,052
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,863,721
Land and Improvements				807,006
Building and Improvements				8,960,767
Gross Amount Carried at End of Period	$ 9,767,773			9,767,773
Accumulated Depreciation	$ 2,548,554			2,548,554
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,767,773
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,548,554
Operating Properties [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Suffolk, VA
Encumbrances				0
Initial Cost of Land				603,391
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,811,340
Land and Improvements				2,628,635
Building and Improvements				4,786,096
Gross Amount Carried at End of Period	$ 7,414,731			7,414,731
Accumulated Depreciation	$ 688,557			688,557
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,414,731
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 688,557
Operating Properties [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Suffolk, VA
Encumbrances				0
Initial Cost of Land				929,844
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,553,719
Land and Improvements				794,848
Building and Improvements				6,688,715
Gross Amount Carried at End of Period	$ 7,483,563			7,483,563
Accumulated Depreciation	$ 1,988,193			1,988,193
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,483,563
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,988,193
Operating Properties [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Sumner, WA
Encumbrances				0
Initial Cost of Land				1,675,402
Initial Cost of Buildings				5,079,543
Costs Capitalized Subsequent to Acquisition				805,288
Land and Improvements				1,675,402
Building and Improvements				5,884,831
Gross Amount Carried at End of Period	$ 7,560,233			7,560,233
Accumulated Depreciation	$ 794,666			794,666
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,560,233
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 794,666
Operating Properties [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				556,952
Initial Cost of Buildings				3,849,236
Costs Capitalized Subsequent to Acquisition				4,060
Land and Improvements				556,952
Building and Improvements				3,853,296
Gross Amount Carried at End of Period	$ 4,410,248			4,410,248
Accumulated Depreciation	$ 401,117			401,117
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,410,248
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 401,117
Operating Properties [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				201,600
Initial Cost of Buildings				1,263,131
Costs Capitalized Subsequent to Acquisition				75,987
Land and Improvements				201,600
Building and Improvements				1,339,118
Gross Amount Carried at End of Period	$ 1,540,718			1,540,718
Accumulated Depreciation	$ 138,245			138,245
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,540,718
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 138,245
Operating Properties [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				936,336
Initial Cost of Buildings				7,155,520
Costs Capitalized Subsequent to Acquisition				1,313
Land and Improvements				936,336
Building and Improvements				7,156,833
Gross Amount Carried at End of Period	$ 8,093,169			8,093,169
Accumulated Depreciation	$ 815,801			815,801
Date of Construction or Acquisition	2,012
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	$ 815,801
Operating Properties [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				650,384
Initial Cost of Buildings				4,764,301
Costs Capitalized Subsequent to Acquisition				168,709
Land and Improvements				650,384
Building and Improvements				4,933,010
Gross Amount Carried at End of Period	$ 5,583,394			5,583,394
Accumulated Depreciation	$ 533,313			533,313
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,583,394
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 533,313
Operating Properties [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				952,860
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,664,502
Land and Improvements				952,860
Building and Improvements				3,664,502
Gross Amount Carried at End of Period	$ 4,617,362			4,617,362
Accumulated Depreciation	$ 1,622,450			1,622,450
Date of Construction or Acquisition	1,998
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,617,362
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,622,450
Operating Properties [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				162,000
Initial Cost of Buildings				1,613,000
Costs Capitalized Subsequent to Acquisition				1,013,160
Land and Improvements				262,416
Building and Improvements				2,525,744
Gross Amount Carried at End of Period	$ 2,788,160			2,788,160
Accumulated Depreciation	$ 1,404,974			1,404,974
Date of Construction or Acquisition	1,981
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,788,160
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,404,974
Operating Properties [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				181,923
Initial Cost of Buildings				1,812,496
Costs Capitalized Subsequent to Acquisition				1,023,370
Land and Improvements				181,923
Building and Improvements				2,835,866
Gross Amount Carried at End of Period	$ 3,017,789			3,017,789
Accumulated Depreciation	$ 1,331,285			1,331,285
Date of Construction or Acquisition	1,979
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,017,789
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,331,285
Operating Properties [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				912,663
Initial Cost of Buildings				5,425,143
Costs Capitalized Subsequent to Acquisition				317,687
Land and Improvements				912,663
Building and Improvements				5,742,830
Gross Amount Carried at End of Period	$ 6,655,493			6,655,493
Accumulated Depreciation	$ 691,053			691,053
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,655,493
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 691,053
Operating Properties [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				655,668
Initial Cost of Buildings				4,132,076
Costs Capitalized Subsequent to Acquisition				160,693
Land and Improvements				655,668
Building and Improvements				4,292,769
Gross Amount Carried at End of Period	$ 4,948,437			4,948,437
Accumulated Depreciation	$ 544,050			544,050
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,948,437
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 544,050
Operating Properties [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				1,718,496
Initial Cost of Buildings				11,697,381
Costs Capitalized Subsequent to Acquisition				912,448
Land and Improvements				1,718,496
Building and Improvements				12,609,829
Gross Amount Carried at End of Period	$ 14,328,325			14,328,325
Accumulated Depreciation	$ 1,340,882			1,340,882
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,328,325
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,340,882
Operating Properties [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				1,203,200
Initial Cost of Buildings				7,979,540
Costs Capitalized Subsequent to Acquisition				197,450
Land and Improvements				1,203,200
Building and Improvements				8,176,990
Gross Amount Carried at End of Period	$ 9,380,190			9,380,190
Accumulated Depreciation	$ 911,735			911,735
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,380,190
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 911,735
Operating Properties [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				754,832
Initial Cost of Buildings				4,966,864
Costs Capitalized Subsequent to Acquisition				(33,459)
Land and Improvements				754,832
Building and Improvements				4,933,405
Gross Amount Carried at End of Period	$ 5,688,237			5,688,237
Accumulated Depreciation	$ 569,711			569,711
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,688,237
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 569,711
Operating Properties [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				612,536
Initial Cost of Buildings				4,168,473
Costs Capitalized Subsequent to Acquisition				9,700
Land and Improvements				612,536
Building and Improvements				4,178,173
Gross Amount Carried at End of Period	$ 4,790,709			4,790,709
Accumulated Depreciation	$ 444,092			444,092
Date of Construction or Acquisition	2,012
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	$ 444,092
Operating Properties [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				374,548
Initial Cost of Buildings				1,354,800
Costs Capitalized Subsequent to Acquisition				775,513
Land and Improvements				374,548
Building and Improvements				2,130,313
Gross Amount Carried at End of Period	$ 2,504,861			2,504,861
Accumulated Depreciation	$ 187,056			187,056
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,504,861
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 187,056
Operating Properties [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				1,134,286
Initial Cost of Buildings				9,241,807
Costs Capitalized Subsequent to Acquisition				380,833
Land and Improvements				1,134,286
Building and Improvements				9,622,639
Gross Amount Carried at End of Period	$ 10,756,925			10,756,925
Accumulated Depreciation	$ 1,062,618			1,062,618
Date of Construction or Acquisition	2,013
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	$ 1,062,618
Operating Properties [Member] | 1850 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				3,975,600
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				23,088,843
Land and Improvements				3,975,600
Building and Improvements				23,088,843
Gross Amount Carried at End of Period	$ 27,064,443			27,064,443
Accumulated Depreciation	$ 1,035,343			1,035,343
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 27,064,443
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,035,343
Operating Properties [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				877,611
Initial Cost of Buildings				4,485,427
Costs Capitalized Subsequent to Acquisition				310,053
Land and Improvements				877,611
Building and Improvements				4,795,480
Gross Amount Carried at End of Period	$ 5,673,091			5,673,091
Accumulated Depreciation	$ 532,163			532,163
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,673,091
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 532,163
Operating Properties [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				1,112,245
Initial Cost of Buildings				2,260,348
Costs Capitalized Subsequent to Acquisition				272,243
Land and Improvements				1,112,245
Building and Improvements				2,532,591
Gross Amount Carried at End of Period	$ 3,644,836			3,644,836
Accumulated Depreciation	$ 329,197			329,197
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,644,836
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 329,197
Operating Properties [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				1,192,820
Initial Cost of Buildings				1,580,155
Costs Capitalized Subsequent to Acquisition				480,998
Land and Improvements				1,192,820
Building and Improvements				2,061,154
Gross Amount Carried at End of Period	$ 3,253,974			3,253,974
Accumulated Depreciation	$ 386,618			386,618
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,253,974
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 386,618
Operating Properties [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tolleson, AZ
Encumbrances				0
Initial Cost of Land				2,295,090
Initial Cost of Buildings				9,079,811
Costs Capitalized Subsequent to Acquisition				3,531,535
Land and Improvements				2,295,090
Building and Improvements				12,611,346
Gross Amount Carried at End of Period	$ 14,906,436			14,906,436
Accumulated Depreciation	$ 3,862,955			3,862,955
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,906,436
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,862,955
Operating Properties [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tolleson, AZ
Encumbrances				0
Initial Cost of Land				1,574,912
Initial Cost of Buildings				7,308,021
Costs Capitalized Subsequent to Acquisition				356,128
Land and Improvements				1,574,912
Building and Improvements				7,664,149
Gross Amount Carried at End of Period	$ 9,239,061			9,239,061
Accumulated Depreciation	$ 970,131			970,131
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,239,061
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 970,131
Operating Properties [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tolleson, AZ
Encumbrances				0
Initial Cost of Land				1,524,603
Initial Cost of Buildings				6,352,070
Costs Capitalized Subsequent to Acquisition				920,094
Land and Improvements				1,524,603
Building and Improvements				7,272,164
Gross Amount Carried at End of Period	$ 8,796,767			8,796,767
Accumulated Depreciation	$ 1,175,768			1,175,768
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,796,767
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,175,768
Operating Properties [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tucker, GA
Encumbrances				0
Initial Cost of Land				435,776
Initial Cost of Buildings				1,875,685
Costs Capitalized Subsequent to Acquisition				411,280
Land and Improvements				435,776
Building and Improvements				2,286,966
Gross Amount Carried at End of Period	$ 2,722,742			2,722,742
Accumulated Depreciation	$ 344,804			344,804
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,722,742
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 344,804
Operating Properties [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tucker, GA
Encumbrances				0
Initial Cost of Land				345,061
Initial Cost of Buildings				1,428,840
Costs Capitalized Subsequent to Acquisition				224,775
Land and Improvements				345,061
Building and Improvements				1,653,615
Gross Amount Carried at End of Period	$ 1,998,676			1,998,676
Accumulated Depreciation	$ 273,948			273,948
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,998,676
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 273,948
Operating Properties [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Washington, DC
Encumbrances				0
Initial Cost of Land				16,558,660
Initial Cost of Buildings				32,223,978
Costs Capitalized Subsequent to Acquisition				1,495,642
Land and Improvements				16,558,660
Building and Improvements				33,719,620
Gross Amount Carried at End of Period	$ 50,278,280			50,278,280
Accumulated Depreciation	$ 6,532,221			6,532,221
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 50,278,280
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 6,532,221
Operating Properties [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Washington, DC
Encumbrances				0
Initial Cost of Land				70,000,000
Initial Cost of Buildings				55,123,783
Costs Capitalized Subsequent to Acquisition				104,422
Land and Improvements				70,000,000
Building and Improvements				55,228,205
Gross Amount Carried at End of Period	$ 125,228,205			125,228,205
Accumulated Depreciation	$ 7,931,434			7,931,434
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 125,228,205
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 7,931,434
Operating Properties [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Chester, PA
Encumbrances				0
Initial Cost of Land				845,846
Initial Cost of Buildings				6,809,025
Costs Capitalized Subsequent to Acquisition				1,042,610
Land and Improvements				845,846
Building and Improvements				7,851,635
Gross Amount Carried at End of Period	$ 8,697,481			8,697,481
Accumulated Depreciation	$ 3,474,894			3,474,894
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,697,481
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 3,474,894
Operating Properties [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Chester, PA
Encumbrances				0
Initial Cost of Land				664,899
Initial Cost of Buildings				5,352,410
Costs Capitalized Subsequent to Acquisition				807,914
Land and Improvements				664,899
Building and Improvements				6,160,324
Gross Amount Carried at End of Period	$ 6,825,223			6,825,223
Accumulated Depreciation	$ 2,950,204			2,950,204
Date of Construction or Acquisition	1,988
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,825,223
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,950,204
Operating Properties [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Chicago, IL
Encumbrances				0
Initial Cost of Land				578,314
Initial Cost of Buildings				2,448,562
Costs Capitalized Subsequent to Acquisition				73,377
Land and Improvements				578,314
Building and Improvements				2,521,939
Gross Amount Carried at End of Period	$ 3,100,253			3,100,253
Accumulated Depreciation	$ 259,204			259,204
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,100,253
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 259,204
Operating Properties [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				4,288,389
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,874,032
Land and Improvements				3,089,043
Building and Improvements				8,073,378
Gross Amount Carried at End of Period	$ 11,162,421			11,162,421
Accumulated Depreciation	$ 2,233,644			2,233,644
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,162,421
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,233,644
Operating Properties [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				5,397,739
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,788,645
Land and Improvements				3,353,552
Building and Improvements				10,832,832
Gross Amount Carried at End of Period	$ 14,186,384			14,186,384
Accumulated Depreciation	$ 2,588,491			2,588,491
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,186,384
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,588,491
Operating Properties [Member] | Liberty Square, Block 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				159,232
Initial Cost of Buildings				1,622,551
Costs Capitalized Subsequent to Acquisition				448,417
Land and Improvements				248,933
Building and Improvements				1,981,268
Gross Amount Carried at End of Period	$ 2,230,201			2,230,201
Accumulated Depreciation	$ 584,097			584,097
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,230,201
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 584,097
Operating Properties [Member] | Liberty Square, Block 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				199,150
Initial Cost of Buildings				1,614,217
Costs Capitalized Subsequent to Acquisition				474,450
Land and Improvements				312,301
Building and Improvements				1,975,516
Gross Amount Carried at End of Period	$ 2,287,817			2,287,817
Accumulated Depreciation	$ 566,264			566,264
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,287,817
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 566,264
Operating Properties [Member] | Liberty Square, Block 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				129,830
Initial Cost of Buildings				1,141,141
Costs Capitalized Subsequent to Acquisition				327,841
Land and Improvements				202,258
Building and Improvements				1,396,554
Gross Amount Carried at End of Period	$ 1,598,812			1,598,812
Accumulated Depreciation	$ 395,755			395,755
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,598,812
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 395,755
Operating Properties [Member] | Liberty Square, Block 5 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Malling, UK
Encumbrances				0
Initial Cost of Land				71,377
Initial Cost of Buildings				735,993
Costs Capitalized Subsequent to Acquisition				200,989
Land and Improvements				109,464
Building and Improvements				898,895
Gross Amount Carried at End of Period	$ 1,008,359			1,008,359
Accumulated Depreciation	$ 254,835			254,835
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,008,359
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 254,835
Operating Properties [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Palm Beach, FL
Encumbrances				0
Initial Cost of Land				2,454,972
Initial Cost of Buildings				5,312,829
Costs Capitalized Subsequent to Acquisition				376,502
Land and Improvements				2,454,972
Building and Improvements				5,689,331
Gross Amount Carried at End of Period	$ 8,144,303			8,144,303
Accumulated Depreciation	$ 711,830			711,830
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,144,303
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 711,830
Operating Properties [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Palm Beach, FL
Encumbrances				0
Initial Cost of Land				1,177,064
Initial Cost of Buildings				2,102,451
Costs Capitalized Subsequent to Acquisition				160,370
Land and Improvements				1,177,064
Building and Improvements				2,262,821
Gross Amount Carried at End of Period	$ 3,439,885			3,439,885
Accumulated Depreciation	$ 272,510			272,510
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,439,885
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 272,510
Operating Properties [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Palm Beach, FL
Encumbrances				0
Initial Cost of Land				1,029,595
Initial Cost of Buildings				1,728,187
Costs Capitalized Subsequent to Acquisition				178,025
Land and Improvements				1,029,595
Building and Improvements				1,906,212
Gross Amount Carried at End of Period	$ 2,935,807			2,935,807
Accumulated Depreciation	$ 249,304			249,304
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,935,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 249,304
Operating Properties [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Weston, FL
Encumbrances				0
Initial Cost of Land				4,682,521
Initial Cost of Buildings				25,905,126
Costs Capitalized Subsequent to Acquisition				1,345,838
Land and Improvements				4,682,521
Building and Improvements				27,250,964
Gross Amount Carried at End of Period	$ 31,933,485			31,933,485
Accumulated Depreciation	$ 2,533,465			2,533,465
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 31,933,485
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 2,533,465
Operating Properties [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Weston, FL
Encumbrances				0
Initial Cost of Land				2,345,242
Initial Cost of Buildings				13,973,766
Costs Capitalized Subsequent to Acquisition				333,227
Land and Improvements				2,345,242
Building and Improvements				14,306,993
Gross Amount Carried at End of Period	$ 16,652,235			16,652,235
Accumulated Depreciation	$ 1,343,050			1,343,050
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,652,235
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 1,343,050
Operating Properties [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Wheeling, IL
Encumbrances				0
Initial Cost of Land				2,051,093
Initial Cost of Buildings				18,283,480
Costs Capitalized Subsequent to Acquisition				537,835
Land and Improvements				2,051,093
Building and Improvements				18,821,316
Gross Amount Carried at End of Period	$ 20,872,409			20,872,409
Accumulated Depreciation	$ 1,890,597			1,890,597
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,872,409
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	1,890,597
Operating Properties [Member] | Subtotal Operating Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances				55,484,649
Initial Cost of Land				1,035,528,258
Initial Cost of Buildings				2,250,324,535
Costs Capitalized Subsequent to Acquisition				2,310,537,775
Land and Improvements				1,094,469,939
Building and Improvements				4,501,920,629
Gross Amount Carried at End of Period	5,596,390,568			5,596,390,568
Accumulated Depreciation	940,114,836			940,114,836
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	5,596,390,568
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 940,114,836
Operating Properties [Member] | 800 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Allentown, PA
Encumbrances				0
Initial Cost of Land				14,754,000
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				41,114,385
Land and Improvements				17,126,315
Building and Improvements				38,742,070
Gross Amount Carried at End of Period	$ 55,868,385			55,868,385
Accumulated Depreciation	$ 376,857			376,857
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 55,868,385
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 376,857
Operating Properties [Member] | 11020 Holly Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Dayton, MN
Encumbrances				0
Initial Cost of Land				2,536,731
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				12,256,969
Land and Improvements				2,536,731
Building and Improvements				12,256,969
Gross Amount Carried at End of Period	$ 14,793,700			14,793,700
Accumulated Depreciation	$ 157,560			157,560
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,793,700
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 157,560
Operating Properties [Member] | 333 Howard Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Des Plaines, IL
Encumbrances				0
Initial Cost of Land				7,928,724
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,263,106
Land and Improvements				7,928,724
Building and Improvements				14,263,106
Gross Amount Carried at End of Period	$ 22,191,830			22,191,830
Accumulated Depreciation	$ 334,384			334,384
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,191,830
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 334,384
Operating Properties [Member] | 120 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				1,243,100
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,590,252
Land and Improvements				1,243,100
Building and Improvements				6,590,252
Gross Amount Carried at End of Period	$ 7,833,352			7,833,352
Accumulated Depreciation	$ 257,972			257,972
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,833,352
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 257,972
Operating Properties [Member] | 130 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				1,171,160
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				6,034,563
Land and Improvements				1,171,160
Building and Improvements				6,034,563
Gross Amount Carried at End of Period	$ 7,205,723			7,205,723
Accumulated Depreciation	$ 135,801			135,801
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,205,723
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 135,801
Operating Properties [Member] | 4485 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				1,827,595
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,597,239
Land and Improvements				1,044,288
Building and Improvements				3,380,546
Gross Amount Carried at End of Period	$ 4,424,834			4,424,834
Accumulated Depreciation	$ 43,002			43,002
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,424,834
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 43,002
Operating Properties [Member] | 11250 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Medley, FL
Encumbrances				0
Initial Cost of Land				4,798,886
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,282,537
Land and Improvements				4,798,886
Building and Improvements				9,282,537
Gross Amount Carried at End of Period	$ 14,081,423			14,081,423
Accumulated Depreciation	$ 223,407			223,407
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,081,423
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 223,407
Operating Properties [Member] | 1200 Intrepid Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				404,883
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,102,718
Land and Improvements				127,741
Building and Improvements				8,379,860
Gross Amount Carried at End of Period	$ 8,507,601			8,507,601
Accumulated Depreciation	$ 85,391			85,391
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,507,601
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 85,391
Operating Properties [Member] | 351 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances
Initial Cost of Land				359,864
Initial Cost of Buildings
Costs Capitalized Subsequent to Acquisition				16,067,260
Land and Improvements				367,016
Building and Improvements				16,060,108
Gross Amount Carried at End of Period	$ 16,427,124			16,427,124
Accumulated Depreciation	$ 11,605			11,605
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,427,124
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 11,605
Operating Properties [Member] | 4701 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				419,107
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				13,298,950
Land and Improvements				435,763
Building and Improvements				13,282,294
Gross Amount Carried at End of Period	$ 13,718,057			13,718,057
Accumulated Depreciation	$ 313,669			313,669
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,718,057
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 313,669
Operating Properties [Member] | 5800 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Richmond, VA
Encumbrances				0
Initial Cost of Land				604,146
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,590,970
Land and Improvements				604,146
Building and Improvements				7,590,970
Gross Amount Carried at End of Period	$ 8,195,116			8,195,116
Accumulated Depreciation	$ 195,005			195,005
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,195,116
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 195,005
Operating Properties [Member] | 5800 Technology Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Sandston, VA
Encumbrances				0
Initial Cost of Land				1,741,867
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				12,004,702
Land and Improvements				1,744,160
Building and Improvements				12,002,409
Gross Amount Carried at End of Period	$ 13,746,569			13,746,569
Accumulated Depreciation	$ 125,617			125,617
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,746,569
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 125,617
Operating Properties [Member] | 1910 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				4,693,504
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				23,579,039
Land and Improvements				4,693,504
Building and Improvements				23,579,039
Gross Amount Carried at End of Period	$ 28,272,543			28,272,543
Accumulated Depreciation	$ 840,894			840,894
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 28,272,543
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 840,894
Operating Properties [Member] | 2040 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				2,689,302
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,201,921
Land and Improvements				2,633,851
Building and Improvements				10,257,372
Gross Amount Carried at End of Period	$ 12,891,223			12,891,223
Accumulated Depreciation	$ 131,584			131,584
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,891,223
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 131,584
Operating Properties [Member] | Maximum [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8620 Congdon Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 700 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11222 Melrose Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5032 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8924 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 330 South Royal Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10721 Jasmine Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 110 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 140 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11835 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7460 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7462 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1050 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10720 West Sam Houston Pkwy N [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11220 Ella Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8303 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1701 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1842 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1902 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8742 Congdon Hill Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11150 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11450 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 29 Liberty Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 201 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5651 Innovation Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1850 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 5 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 800 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11020 Holly Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 333 Howard Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 120 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 130 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4485 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 10720 West Sam Houston Parkway North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 11250 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1200 Intrepid Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 351 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 4701 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5800 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 5800 Technology Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 1910 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Maximum [Member] | 2040 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	40 years
Operating Properties [Member] | Minimum [Member] | 627 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1467 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1501 Perryman Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 869 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 901 S Route 53 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8620 Congdon Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 200 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 250 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 400 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 650 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 651 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 700 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 705 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7165 Ambassador Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7248 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7339 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7437 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8014 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8150 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8250 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8400 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6330 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6350 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6370 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6390 Hedgewood Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6520 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6540 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6560 Stonegate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6580 Snowdrift Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7620 Cetronia Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 700 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11222 Melrose Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3095 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3097 Presidential Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7030 Buford Highway NE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Barton 150 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1055-1071 Kingsland Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4606 Richlynn Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11800 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11850 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11900 Baltimore Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12104 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12200 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12240 Indian Creek Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1071 Thorndale Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1260-1274 Ellis Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 371-377 Meyer Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 850-880 Devon Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10 Emery Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2785 Commerce Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1455 Remington Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 150 E Crossroads Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 553 S Joliet Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 400 Boulder Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8201 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8500 Industrial Bouldvard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 860 Nestle Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1485 W Commerce Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 40 Logistics Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 135-195 East Elk Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 515 Kehoe Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1413 Bradley Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3200 Belmeade Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1475 Nitterhouse Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 95 Kriner Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9000 109th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11701 Goodrich Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12810 Virkler Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2700 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2701 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2730 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2801 Hutchinson McDonald Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3000 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3005 Crosspoint Center Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4045 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4047 Perimeter West Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4525 Statesville Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4835 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4925 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5032 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5033 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5039 Sirona Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8910 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8916 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8924 Pioneer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2601 Indian River Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1540 S 54th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4650 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4750 Lake Forest Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9645 Gerwig Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2550 John Glenn Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3800 Twin Creeks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 330 South Royal Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 455 Airline Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2130 Baldwin Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 329-333 Herrod Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1250 Hall Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1680 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1700 Executive Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2670 Breckinridge Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 170 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 190 Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 265 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 285 Parkway East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Parliament Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4226 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4227 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4234 Surles Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4300 Emperor Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3169 Dodd Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3711 Kennebec Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 917 Lone Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10301-10305 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10321 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10333 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10349-10357 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10365-10375 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10393-10394 West 70th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7075 Flying Cloud Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7078 Shady Oak Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7777 Golden Triangle Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2250 Arthur Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6600 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6675 Business Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7351 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 21705-21707 Mississippi Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 27143 S Baseline Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1800 Donaldson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6880 Fairfield Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7000-7018 Fairfield Business [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10721 Jasmine Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2000 Southpointe Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1400 NW 65th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6500 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6501 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6600 NW 12th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9601 Cosner Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12601 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12641 Industry Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12681-12691 Pala Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 850 S Jupiter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2510 W Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4251 North Highway 121 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 116 Pleasant Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 25 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 45 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2011 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2121 Southtech Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 800 Commerce Parkway West Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 110 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 140 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1487 South Highway 101 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2727 London Grove Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11835 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11841 Newgate Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1560 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1575 Hunter Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7361 Coca Cola Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7460 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7462 New Ridge Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 500 McCarthy Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 600 Industrial Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7195 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7253 Grayson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12537 Cerise Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1010 Petersburg Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 785 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 805 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 825 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 845 Lindbergh Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1498 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4183 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4189 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4195 Eagle Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4328, 4336 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4344 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4380 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4388 Federal Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4475 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4500 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4501 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4523 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4524 Green Point Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Unit 5 Logix Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1515 6th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1600 5th Street South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1000 South Loop West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10241 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10245 W Little York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10301 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10305 Round Up Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1050 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10607 Haddington Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10720 West Sam Houston Pkwy N [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10735 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10739 West Little York Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11201 Greens Crossing Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11220 Ella Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1283 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1287 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1291 N Post Oak Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1416 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1420 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 14200 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1424 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1428 N Sam Houston Parkway E [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 14300 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 14400 Hollister Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 15102 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 15150 Sommermeyer St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16330 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16405 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16420 West Hardy Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16445 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1646 Rankin Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1655 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16580 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16602 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16605 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1665 Townhurst Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16680 Central Green Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 16685 Air Center Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1755 Trans Central Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4301 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4401 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4501 S Pinemont Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5200 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5250 N. Sam Houston Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5500 N. Sam Houston Parkway West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8017 Pinemont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8272 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8282 El Rio Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8301 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8303 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 850 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 860 Greens Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8802-8824 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8825-8839 N Sam Houston Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8850-8872 Fallbrook Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Liberty 11 at Central Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Cabot III UK1B01 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1011 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1035 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1549 W Glenlake Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 901 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 925 N Hilltop Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8241 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8242 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8246 Sandy Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1305 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1325 Chastain Road NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3600 Cobb International Bld NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Unit 1 Bear Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2100 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2201 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2300 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2301 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2500 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2520 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2560 Renaissance Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2700 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2900 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3000 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3100 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3200 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3400 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3500 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3600 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3602 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3604 Horizon Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 440 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 460 East Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 650 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 680 Swedesford Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1700 Interstate Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5801 Columbia Park Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11425 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11503 State Highway 225 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1701 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1842 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1902 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 640 S State Road 39 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7528 Walker Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8301 Industrial Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8500 Willard Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 875 Maxham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8742 Congdon Hill Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7533 Industrial Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10, 20 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 100 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1001 Cedar Hollow Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11,15 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 12,14,16 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 14 Lee Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 18 Great Valley Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 200 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 300-400 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 311 Technology Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 425 Old Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 45 Liberty Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 50 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 500 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 60 Morehall Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 600 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 700 Chesterfield Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1169 Canton Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 65 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 75 Brookfield Oaks Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 126-132 Liberty Industrial Pkw [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 95-115 Liberty Industrial Pkwy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11150 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11401 NW 134th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11450 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 456 International Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 21 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4 S Middlesex Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 22750 Cactus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 323 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 324 Park Knoll Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 619 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 701 Distribution Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1879 Lamont Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 350 Winmeyer Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4000 E Airport Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10003 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10511 & 10611 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10771 Palm Bay Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1090 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1400-1440 Central Florida Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1902 Cypress Lake Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2000 Park Oaks Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2202 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2212 Taft Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2256 Taft-Vineland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2351 Investors Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2400 South Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2412 Sand Lake Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2416 Lake Orange Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6200 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6501 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6918 Presidents Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6923 Lee Vista Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7022 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7100 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7101 TPC Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 7315 Kingspointe Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 851 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 950 Gills Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 29 Liberty Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9550 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9600 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9700 Satellite Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 150 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 201 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4000 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4050 S 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4300 South 26th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4751 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4775 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5 Crescent Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8th & Walnut Streets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2626 South 7th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 563 South 63rd Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1000 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1901 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1909 10th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3605 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3701 East Plano Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 800 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 900 Klein Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9801 80th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 14630-14650 28th Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2920 Northwest Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5905 Trenton Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6055 Nathan Lane North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1400 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1405 SW 6th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1500 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1501 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1601 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1651 SW 5th Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2201-2215 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2250-2270 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2280-2300 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2301-2329 NW 30th Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3000 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3001-3037 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3012-3050 NW 25th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 595 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 601 SW 13th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 605 SW 16th Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1920 West Baseline Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 301 Hill Carter Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4101-4127 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4201-4261 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4263-4299 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4263F-N. Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4301-4335 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4337-4379 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4401-4445 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4447-4491 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4501-4549 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4551-4593 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4601-4643 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4645-4683 Carolina Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4717-4729 Eubank Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 510 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 520 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 530 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 540 Eastpark Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5600-5626 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5601-5659 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5650-5674 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5700 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5701-5799 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5900 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6000 Eastport Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6530 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6532 Judge Adams Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 13098 George Weber Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 13220 Wilfred Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 13225 Brockton Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1070 Windham Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1550 Central Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1135 Aviation Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8715 Bollman Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8501 East Raintree Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1150 Gateway Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5555 12th Avenue East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5651 Innovation Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1210 Champion Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9300 Old Scotland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3990 Heritage Oak Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3654-3668 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3701 Illinois Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3950-3980 Swenson Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1501 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1527 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1551 102nd Avenue North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6900 Harbor View Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6920 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 6950 Harbour View Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1516 Fryar Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3401-3409 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3502 Roga Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3505 Cragmont Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 3608 Queen Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5250 Eagle Trail Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5501-5519 Pioneer Park Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5690-5694 Crenshaw Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8110 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8130 Anderson Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9020 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9110 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9203 King Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9319 Peach Palm Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9704 Solar Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 9945 Currie Davis Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1850 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1858 E Encanto Dr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 475 W Vaughn St [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 921 South Park Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8313 West Pierce Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8591 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 8601 West Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5111 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5151 S Royal Atlanta Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1100 17th Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2100 M Street NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 400-500 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 600 Brandywine Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1400 Powis Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1 Kings Hill Aveune [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 42 Kings Hill Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 5 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 300 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 400 Northpoint Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2935 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2945 West Corporate Lakes Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 43-47 Hintz Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 800 Uline Way [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11020 Holly Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 333 Howard Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 120 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 130 Caliber Ridge Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4485 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 10720 West Sam Houston Parkway North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 11250 NW 122nd Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1200 Intrepid Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 351 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 4701 League Island Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5800 Eastport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 5800 Technology Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 1910 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Operating Properties [Member] | Minimum [Member] | 2040 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life (years)	5 years
Development in Progress [Member] | 3225 Gravel Springs Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Buford, GA
Encumbrances				0
Initial Cost of Land				2,807,020
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,988,171
Land and Improvements				0
Building and Improvements				10,795,191
Gross Amount Carried at End of Period	$ 10,795,191			10,795,191
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,795,191
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 3525 Gravel Springs Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Buford, GA
Encumbrances				0
Initial Cost of Land				1,391,065
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,220,195
Land and Improvements				0
Building and Improvements				6,611,260
Gross Amount Carried at End of Period	$ 6,611,260			6,611,260
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,611,260
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1951 TW Alexander Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				1,115,595
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,139,353
Land and Improvements				0
Building and Improvements				4,254,948
Gross Amount Carried at End of Period	$ 4,254,948			4,254,948
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,254,948
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1953 TW Alexander Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				2,402,820
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,406,047
Land and Improvements				0
Building and Improvements				7,808,867
Gross Amount Carried at End of Period	$ 7,808,867			7,808,867
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,808,867
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1075 King George Post Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Edison, NJ
Encumbrances				0
Initial Cost of Land				0
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,981,558
Land and Improvements				0
Building and Improvements				8,981,558
Gross Amount Carried at End of Period	$ 8,981,558			8,981,558
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,981,558
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 2988 Green Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				2,271,948
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,767,991
Land and Improvements				0
Building and Improvements				6,039,939
Gross Amount Carried at End of Period	$ 6,039,939			6,039,939
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,039,939
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 4485 Premier Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	High Point, NC
Encumbrances				0
Initial Cost of Land				1,827,595
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,438,892
Land and Improvements				0
Building and Improvements				3,266,487
Gross Amount Carried at End of Period	$ 3,266,487			3,266,487
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,266,487
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 5430 FAA Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Irving, TX
Encumbrances				0
Initial Cost of Land				2,245,346
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				9,165,655
Land and Improvements				0
Building and Improvements				11,411,001
Gross Amount Carried at End of Period	$ 11,411,001			11,411,001
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,411,001
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 951 Valleyview Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Irving, TX
Encumbrances				0
Initial Cost of Land				3,899,824
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				13,094,727
Land and Improvements				0
Building and Improvements				16,994,551
Gross Amount Carried at End of Period	$ 16,994,551			16,994,551
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,994,551
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1200 Claybrick Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Landover, MD
Encumbrances				0
Initial Cost of Land				6,876,500
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,297,654
Land and Improvements				0
Building and Improvements				14,174,154
Gross Amount Carried at End of Period	$ 14,174,154			14,174,154
Accumulated Depreciation
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 14,174,154
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation
Development in Progress [Member] | 1801 South 16th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	LaPorte, TX
Encumbrances				0
Initial Cost of Land				3,794,963
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,998,448
Land and Improvements				0
Building and Improvements				18,793,411
Gross Amount Carried at End of Period	$ 18,793,411			18,793,411
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 18,793,411
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 8801 Congdon Hill Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Mertztown, PA
Encumbrances				0
Initial Cost of Land				23,016,646
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				10,368,794
Land and Improvements				0
Building and Improvements				33,385,440
Gross Amount Carried at End of Period	$ 33,385,440			33,385,440
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 33,385,440
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 11440 NW 122 Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Miami, FL
Encumbrances
Initial Cost of Land				5,636,564
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,868,985
Land and Improvements				0
Building and Improvements				13,505,549
Gross Amount Carried at End of Period	$ 13,505,549			13,505,549
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 13,505,549
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1050 Constitution Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				1,969,501
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,545,658
Land and Improvements				0
Building and Improvements				16,515,159
Gross Amount Carried at End of Period	$ 16,515,159			16,515,159
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 16,515,159
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]
Location	Philadelphia, PA
Encumbrances				0
Initial Cost of Land				404,883
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				18,785,986
Land and Improvements				0
Building and Improvements				19,190,869
Gross Amount Carried at End of Period	$ 19,190,869			19,190,869
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,190,869
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 351 Rouse Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Phoenix, AZ
Encumbrances
Initial Cost of Land				4,234,407
Initial Cost of Buildings
Costs Capitalized Subsequent to Acquisition				594,110
Land and Improvements				0
Building and Improvements				4,828,517
Gross Amount Carried at End of Period	$ 4,828,517			4,828,517
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,828,517
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 7205 W Buckeye Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Phoenix, AZ
Encumbrances
Initial Cost of Land				2,514,425
Initial Cost of Buildings
Costs Capitalized Subsequent to Acquisition				8,326,405
Land and Improvements				0
Building and Improvements				10,840,830
Gross Amount Carried at End of Period	$ 10,840,830			10,840,830
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 10,840,830
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 3929 Shutterfly Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Charlotte, NC
Encumbrances
Initial Cost of Land				592,233
Initial Cost of Buildings
Costs Capitalized Subsequent to Acquisition				1,407,692
Land and Improvements				0
Building and Improvements				1,999,925
Gross Amount Carried at End of Period	$ 1,999,925			1,999,925
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,999,925
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1870 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances
Initial Cost of Land				2,272,702
Initial Cost of Buildings
Costs Capitalized Subsequent to Acquisition				4,551,276
Land and Improvements				0
Building and Improvements				6,823,978
Gross Amount Carried at End of Period	$ 6,823,978			6,823,978
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,823,978
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 1930 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				4,069,890
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				17,940,732
Land and Improvements				0
Building and Improvements				22,010,622
Gross Amount Carried at End of Period	$ 22,010,622			22,010,622
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,010,622
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 2040 W Rio Salado Parkway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Tempe, AZ
Encumbrances				0
Initial Cost of Land				535,698
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,025,217
Land and Improvements				0
Building and Improvements				2,560,915
Gross Amount Carried at End of Period	$ 2,560,915			2,560,915
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,560,915
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 6017 Southern Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Palm Beach, FL
Encumbrances				0
Initial Cost of Land				4,513,860
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,496,005
Land and Improvements				0
Building and Improvements				12,009,865
Gross Amount Carried at End of Period	$ 12,009,865			12,009,865
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,009,865
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | 6035 Southern Blvd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	West Palm Beach, FL
Encumbrances				0
Initial Cost of Land				2,499,894
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,511,565
Land and Improvements				0
Building and Improvements				7,011,459
Gross Amount Carried at End of Period	$ 7,011,459			7,011,459
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,011,459
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Development in Progress [Member] | Worcester 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Worcester, UK
Encumbrances				0
Initial Cost of Land				843,256
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				842,633
Land and Improvements				0
Building and Improvements				1,685,889
Gross Amount Carried at End of Period	$ 1,685,889			1,685,889
Accumulated Depreciation
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,685,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation
Development in Progress [Member] | Worcester 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Worcester, UK
Encumbrances				0
Initial Cost of Land				3,172,249
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,777,190
Land and Improvements				0
Building and Improvements				5,949,439
Gross Amount Carried at End of Period	$ 5,949,439			5,949,439
Accumulated Depreciation
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,949,439
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation
Development in Progress [Member] | Total Development in Progress [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances				0
Initial Cost of Land				84,908,884
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				182,540,939
Land and Improvements				0
Building and Improvements				267,449,823
Gross Amount Carried at End of Period	267,449,823			267,449,823
Accumulated Depreciation	0			0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	267,449,823
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]
Location	Arlington, TX
Encumbrances				0
Initial Cost of Land				4,754,659
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				974,353
Land and Improvements				5,729,011
Building and Improvements				0
Gross Amount Carried at End of Period	$ 5,729,011			5,729,011
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,729,011
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | 350 N York Rd [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Bensenville, IL
Encumbrances
Initial Cost of Land				3,043,130
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				256,481
Land and Improvements				3,299,611
Building and Improvements				0
Gross Amount Carried at End of Period	$ 3,299,611			3,299,611
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,299,611
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]
Location	Bethlehem, PA
Encumbrances				0
Initial Cost of Land				17,719,400
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,023,124
Land and Improvements				22,742,524
Building and Improvements				0
Gross Amount Carried at End of Period	$ 22,742,524			22,742,524
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 22,742,524
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | 180 Dulty's Lane Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Burlington, NJ
Encumbrances
Initial Cost of Land				2,866,850
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				14,876
Land and Improvements				2,881,726
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,881,726			2,881,726
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,881,726
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | Camden Town Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Camden, NJ
Encumbrances
Initial Cost of Land				11,303,073
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,918,928
Land and Improvements				19,222,001
Building and Improvements				0
Gross Amount Carried at End of Period	$ 19,222,001			19,222,001
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,222,001
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]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				208,646
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				75,122
Land and Improvements				283,768
Building and Improvements				0
Gross Amount Carried at End of Period	$ 283,768			283,768
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 283,768
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]
Location	Charlotte, NC
Encumbrances				0
Initial Cost of Land				644,925
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				493,059
Land and Improvements				1,137,984
Building and Improvements				0
Gross Amount Carried at End of Period	$ 1,137,984			1,137,984
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,137,984
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | Mountain Creek Business Park L [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Dallas, TX
Encumbrances
Initial Cost of Land				7,984,928
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				172,493
Land and Improvements				8,157,421
Building and Improvements				0
Gross Amount Carried at End of Period	$ 8,157,421			8,157,421
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,157,421
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]
Location	Dayton, MN
Encumbrances				0
Initial Cost of Land				889,205
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				192,208
Land and Improvements				1,081,413
Building and Improvements				0
Gross Amount Carried at End of Period	$ 1,081,413			1,081,413
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 1,081,413
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | French Lake Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Dayton/Rogers, MN
Encumbrances				0
Initial Cost of Land				13,513,632
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,731,745
Land and Improvements				19,245,377
Building and Improvements				0
Gross Amount Carried at End of Period	$ 19,245,377			19,245,377
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 19,245,377
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]
Location	Durham, NC
Encumbrances				0
Initial Cost of Land				758,503
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,517,278
Land and Improvements				2,275,781
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,275,781			2,275,781
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,275,781
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]
Location	Eden Prairie, MN
Encumbrances				0
Initial Cost of Land				2,051,631
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				5,163,382
Land and Improvements				7,215,013
Building and Improvements				0
Gross Amount Carried at End of Period	$ 7,215,013			7,215,013
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,215,013
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]
Location	Goodyear, AZ
Encumbrances				0
Initial Cost of Land				16,857,556
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,251,564
Land and Improvements				21,109,120
Building and Improvements				0
Gross Amount Carried at End of Period	$ 21,109,120			21,109,120
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 21,109,120
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]
Location	Greensboro, NC
Encumbrances				0
Initial Cost of Land				564,535
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,936,254
Land and Improvements				3,500,789
Building and Improvements				0
Gross Amount Carried at End of Period	$ 3,500,789			3,500,789
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,500,789
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]
Location	Greer, SC
Encumbrances				0
Initial Cost of Land				16,338
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				43,899
Land and Improvements				60,237
Building and Improvements				0
Gross Amount Carried at End of Period	$ 60,237			60,237
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 60,237
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]
Location	Hanover, MD
Encumbrances				0
Initial Cost of Land				3,875,203
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				716,672
Land and Improvements				4,591,875
Building and Improvements				0
Gross Amount Carried at End of Period	$ 4,591,875			4,591,875
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,591,875
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]
Location	Hanover, MD
Encumbrances				0
Initial Cost of Land				3,371,183
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				(583,888)
Land and Improvements				2,787,295
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,787,295			2,787,295
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,787,295
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]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				5,160,668
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				27,267
Land and Improvements				5,187,935
Building and Improvements				0
Gross Amount Carried at End of Period	$ 5,187,935			5,187,935
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,187,935
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]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				5,756,865
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,891,085
Land and Improvements				9,647,950
Building and Improvements				0
Gross Amount Carried at End of Period	$ 9,647,950			9,647,950
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,007
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 9,647,950
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]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				26,135,466
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				7,533,750
Land and Improvements				33,669,216
Building and Improvements				0
Gross Amount Carried at End of Period	$ 33,669,216			33,669,216
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 33,669,216
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]
Location	Houston, TX
Encumbrances				0
Initial Cost of Land				4,611,474
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,317,825
Land and Improvements				6,929,299
Building and Improvements				0
Gross Amount Carried at End of Period	$ 6,929,299			6,929,299
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,929,299
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]
Location	Irving, TX
Encumbrances				0
Initial Cost of Land				1,917,440
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				668,084
Land and Improvements				2,585,524
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,585,524			2,585,524
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,585,524
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]
Location	Kent, UK
Encumbrances				0
Initial Cost of Land				0
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				11,145,627
Land and Improvements				11,145,627
Building and Improvements				0
Gross Amount Carried at End of Period	$ 11,145,627			11,145,627
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 11,145,627
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | Port Crossing Commerce Center Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	La Porte, TX
Encumbrances				0
Initial Cost of Land				18,896,380
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,089,507
Land and Improvements				20,985,887
Building and Improvements				0
Gross Amount Carried at End of Period	$ 20,985,887			20,985,887
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 20,985,887
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]
Location	Logan, NJ
Encumbrances				0
Initial Cost of Land				792,118
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,436,192
Land and Improvements				2,228,310
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,228,310			2,228,310
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	1,995
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,228,310
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]
Location	Lower Macungie Twp, PA
Encumbrances				0
Initial Cost of Land				26,735,346
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				8,428,952
Land and Improvements				35,164,298
Building and Improvements				0
Gross Amount Carried at End of Period	$ 35,164,298			35,164,298
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 35,164,298
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]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				1,344,809
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				0
Land and Improvements				1,344,809
Building and Improvements				0
Gross Amount Carried at End of Period	$ 1,344,809			1,344,809
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,012
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] | 6 Great Valley Parkway Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				603,050
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,299,866
Land and Improvements				2,902,916
Building and Improvements				0
Gross Amount Carried at End of Period	$ 2,902,916			2,902,916
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 2,902,916
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | Old Morehall Rd Land (Morelli) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	Malvern, PA
Encumbrances
Initial Cost of Land				3,343,863
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				31,220
Land and Improvements				3,375,083
Building and Improvements				0
Gross Amount Carried at End of Period	$ 3,375,083			3,375,083
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,375,083
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]
Location	Malvern, PA
Encumbrances				0
Initial Cost of Land				675,499
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				297,170
Land and Improvements				972,669
Building and Improvements				0
Gross Amount Carried at End of Period	$ 972,669			972,669
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,001
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 972,669
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]
Location	Medley, FL
Encumbrances				0
Initial Cost of Land				10,811,686
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				15,276,884
Land and Improvements				26,088,570
Building and Improvements				0
Gross Amount Carried at End of Period	$ 26,088,570			26,088,570
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 26,088,570
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]
Location	Nazareth, PA
Encumbrances				0
Initial Cost of Land				4,667,646
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				490,247
Land and Improvements				5,157,893
Building and Improvements				0
Gross Amount Carried at End of Period	$ 5,157,893			5,157,893
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 5,157,893
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]
Location	Orlando, FL
Encumbrances				0
Initial Cost of Land				267,468
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				221,948
Land and Improvements				489,416
Building and Improvements				0
Gross Amount Carried at End of Period	$ 489,416			489,416
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,004
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 489,416
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]
Location	Palm Beach County, FL
Encumbrances				0
Initial Cost of Land				8,051,351
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				4,574,886
Land and Improvements				12,626,237
Building and Improvements				0
Gross Amount Carried at End of Period	$ 12,626,237			12,626,237
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 12,626,237
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]
Location	Phoenix, AZ
Encumbrances				0
Initial Cost of Land				6,173,841
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				1,405,210
Land and Improvements				7,579,051
Building and Improvements				0
Gross Amount Carried at End of Period	$ 7,579,051			7,579,051
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 7,579,051
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0
Land Held for Development [Member] | Redlands Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	San Bernadino, CA
Encumbrances
Initial Cost of Land				4,040,825
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				420,399
Land and Improvements				4,461,224
Building and Improvements				0
Gross Amount Carried at End of Period	$ 4,461,224			4,461,224
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 4,461,224
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]
Location	Sandston, VA
Encumbrances				0
Initial Cost of Land				148,314
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				21,430
Land and Improvements				169,744
Building and Improvements				0
Gross Amount Carried at End of Period	$ 169,744			169,744
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	1,996
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 169,744
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]
Location	Scottsdale, AZ
Encumbrances				0
Initial Cost of Land				6,176,464
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				2,175,590
Land and Improvements				8,352,054
Building and Improvements				0
Gross Amount Carried at End of Period	$ 8,352,054			8,352,054
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,005
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 8,352,054
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]
Location	Suffolk, VA
Encumbrances				0
Initial Cost of Land				2,715,714
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				813,055
Land and Improvements				3,528,769
Building and Improvements				0
Gross Amount Carried at End of Period	$ 3,528,769			3,528,769
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 3,528,769
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]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				180,136
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				30,098
Land and Improvements				210,234
Building and Improvements				0
Gross Amount Carried at End of Period	$ 210,234			210,234
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 210,234
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]
Location	Tampa, FL
Encumbrances				0
Initial Cost of Land				3,289,423
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				3,155,681
Land and Improvements				6,445,104
Building and Improvements				0
Gross Amount Carried at End of Period	$ 6,445,104			6,445,104
Accumulated Depreciation	$ 0			0
Date of Construction or Acquisition	2,006
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	$ 6,445,104
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]
Encumbrances				0
Initial Cost of Land				232,919,243
Initial Cost of Buildings				0
Costs Capitalized Subsequent to Acquisition				103,649,523
Land and Improvements				336,568,765
Building and Improvements				0
Gross Amount Carried at End of Period	336,568,765			336,568,765
Accumulated Depreciation	0			$ 0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Gross	336,568,765
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Real Estate Accumulated Depreciation	$ 0