STAG Industrial (STAG) 10-Q6 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013	Nov. 04, 2013
Document and Entity Information	'	'
Entity Registrant Name	'STAG Industrial, Inc.	'
Entity Central Index Key	'0001479094	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	44,159,083
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Rental Property:	'	'
Land	$126,685	$104,656
Buildings	813,705	654,518
Tenant improvements	35,717	34,900
Building and land improvements	30,831	22,153
Less: accumulated depreciation	-64,562	-46,175
Total rental property, net	942,376	770,052
Cash and cash equivalents	23,909	19,006
Restricted cash	6,810	5,497
Tenant accounts receivable, net	12,911	9,351
Prepaid expenses and other assets	3,590	1,556
Interest rate swaps	2,282	'
Deferred financing fees, net	5,354	4,704
Leasing commissions, net	2,720	1,674
Goodwill	4,923	4,923
Due from related parties	180	806
Deferred leasing intangibles, net	208,097	187,555
Total assets	1,213,152	1,005,124
Liabilities:	'	'
Mortgage notes payable	226,686	229,915
Unsecured credit facility	20,000	99,300
Unsecured term loans	250,000	150,000
Accounts payable, accrued expenses and other liabilities	16,158	12,111
Interest rate swaps	131	480
Tenant prepaid rent and security deposits	7,956	5,686
Dividends and distributions payable	15,285	11,301
Deferred leasing intangibles, net	6,871	6,871
Total liabilities	543,087	515,664
Commitments and contingencies	'	'
Equity:	'	'
Common stock, par value $0.01 per share, 100,000,000 shares authorized, 44,052,248 and 35,698,582 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	440	357
Additional paid-in capital	562,511	419,643
Common stock dividends in excess of earnings	-105,697	-61,024
Accumulated other comprehensive income (loss)	1,906	-371
Total stockholders' equity	598,160	427,605
Noncontrolling interest	71,905	61,855
Total equity	670,065	489,460
Total liabilities and equity	1,213,152	1,005,124
Series A Preferred Stock	'	'
Equity:	'	'
Preferred stock	69,000	69,000
Series B Preferred Stock	'	'
Equity:	'	'
Preferred stock	$70,000	'

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012
Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Series A Preferred Stock	Series A Preferred Stock	Series B Preferred Stock	Series B Preferred Stock
Preferred stock, par value (in dollars per share)	'	'	$0.01	$0.01	$0.01	$0.01
Preferred stock, shares authorized	'	'	10,000,000	10,000,000	10,000,000	10,000,000
Preferred stock, shares issued	'	'	2,760,000	2,760,000	2,800,000	2,800,000
Preferred stock, shares outstanding	'	'	2,760,000	2,760,000	2,800,000	2,800,000
Preferred stock, liquidation preference (in dollars per share)	'	'	$25	$25	$25	$25
Common stock, par value (in dollars per share)	$0.01	$0.01	'	'	'	'
Common stock, shares authorized	100,000,000	100,000,000	'	'	'	'
Common stock, shares issued	44,052,248	35,698,582	'	'	'	'
Common stock, shares outstanding	44,052,248	35,698,582	'	'	'	'

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	'	'	'	'
Rental income	$30,391	$18,708	$84,871	$50,797
Tenant recoveries	4,285	2,063	11,427	6,068
Other income	207	331	865	981
Total revenue	34,883	21,102	97,163	57,846
Expenses	'	'	'	'
Property	2,686	1,262	7,699	4,030
General and administrative	4,376	3,656	13,358	9,962
Real estate taxes and insurance	3,622	1,603	9,518	4,574
Property acquisition costs	986	1,067	2,831	2,509
Depreciation and amortization	17,463	10,236	49,411	28,110
Loss on impairment	'	'	'	622
Other expenses	89	86	336	145
Total expenses	29,222	17,910	83,153	49,952
Other income (expense)	'	'	'	'
Interest income	3	9	9	17
Interest expense	-5,370	-3,558	-14,866	-11,776
Gain on interest rate swaps	'	'	'	215
Offering costs	'	'	-27	-68
Loss on extinguishment of debt	'	-947	'	-929
Total other income (expense)	-5,367	-4,496	-14,884	-12,541
Net income (loss) from continuing operations	294	-1,304	-874	-4,647
Discontinued operations	'	'	'	'
Income attributable to discontinued operations	'	329	102	564
Loss on impairment attributable to discontinued operations	'	-3,941	'	-3,941
Gain on sales of real estate	'	'	464	219
Total income (loss) attributable to discontinued operations	'	-3,612	566	-3,158
Net income (loss)	294	-4,916	-308	-7,805
Less: loss attributable to noncontrolling interest after preferred stock dividends	-335	-1,248	-958	-3,244
Net income (loss) attributable to STAG Industrial, Inc.	629	-3,668	650	-4,561
Less: preferred stock dividends	2,712	1,553	6,783	4,659
Less: amount allocated to unvested restricted stockholders	64	41	197	81
Net loss attributable to common stockholders	($2,147)	($5,262)	($6,330)	($9,301)
Weighted average common shares outstanding - basic and diluted (in shares)	42,753,722	29,752,057	41,766,740	21,716,590
Loss per share - basic and diluted	'	'	'	'
Income (loss) from discontinued operations attributable to common stockholders (in dollars per share)	'	($0.10)	$0.01	($0.11)
Loss from continuing operations attributable to common stockholders (in dollars per share)	($0.05)	($0.08)	($0.16)	($0.32)
Loss per share - basic and diluted (in dollars per share)	($0.05)	($0.18)	($0.15)	($0.43)

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Comprehensive Income (Loss)	'	'	'	'
Net income (loss)	$294	($4,916)	($308)	($7,805)
Other comprehensive income (loss):	'	'	'	'
Unrealized gain (loss) on interest rate swaps	-1,034	-577	2,632	-577
Other comprehensive income (loss)	-1,034	-577	2,632	-577
Comprehensive income (loss)	-740	-5,493	2,324	-8,382
Net loss attributable to noncontrolling interest after preferred stock dividends	335	1,248	958	3,244
Other comprehensive (income) loss attributable to noncontrolling interest	143	111	-355	150
Comprehensive income (loss) attributable to STAG Industrial, Inc.	($262)	($4,134)	$2,927	($4,988)

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Total Stockholders' Equity	Preferred Stock	Common Shares	Additional Paid-in Capital	Common Stock Dividends in excess of Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest - Unit holders in Operating Partnership
In Thousands, except Share data, unless otherwise specified	Total	Total Stockholders' Equity	Preferred Stock	Common Shares	Additional Paid-in Capital	Common Stock Dividends in excess of Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2011	$309,909	$230,693	$69,000	$159	$179,919	($18,385)	'	$79,216
Balance (in shares) at Dec. 31, 2011	'	'	'	15,901,560	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'
Proceeds from sales of common stock	237,568	237,568	'	176	237,392	'	'	'
Proceeds from sales of common stock (in shares)	'	'	'	17,537,500	'	'	'	'
Offering costs	-10,863	-10,863	'	'	-10,863	'	'	'
Issuance of restricted stock, net	'	'	'	1	-1	'	'	'
Issuance of restricted stock, net (in shares)	'	'	'	87,025	'	'	'	'
Issuance of common stock (in shares)	'	'	'	9,790	'	'	'	'
Dividends and distributions, net	-30,908	-24,970	-4,659	'	'	-20,311	'	-5,938
Non-cash compensation	1,457	746	'	'	746	'	'	711
Issuance of units for acquisition fee	225	'	'	'	'	'	'	225
Conversion of operating partnership units to common stock	'	13,161	'	13	13,148	'	'	-13,161
Conversion of operating partnership units to common stock (in shares)	'	'	'	1,335,224	'	'	'	'
Rebalancing of noncontrolling interest	'	-11,507	'	'	-11,507	'	'	11,507
Comprehensive income (loss)	-577	-427	'	'	'	'	-427	-150
Net income (loss)	-7,805	-4,561	4,659	'	'	-9,220	'	-3,244
Balance at Sep. 30, 2012	499,006	429,840	69,000	349	408,834	-47,916	-427	69,166
Balance (in shares) at Sep. 30, 2012	'	'	'	34,871,099	'	'	'	'
Balance at Dec. 31, 2012	489,460	427,605	69,000	357	419,643	-61,024	-371	61,855
Balance (in shares) at Dec. 31, 2012	'	'	'	35,698,582	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'
Proceeds from sales of common stock	154,669	154,669	'	82	154,587	'	'	'
Proceeds from sales of common stock (in shares)	'	'	'	8,247,322	'	'	'	'
Issuance of series B preferred stock	70,000	70,000	70,000	'	'	'	'	'
Offering costs	-8,457	-8,457	'	'	-8,457	'	'	'
Issuance of restricted stock, net	'	'	'	1	-1	'	'	'
Issuance of restricted stock, net (in shares)	'	'	'	96,287	'	'	'	'
Issuance of common stock (in shares)	'	'	'	7,871	'	'	'	'
Dividends and distributions, net	-51,657	-45,323	-6,783	'	'	-38,540	'	-6,334
Non-cash compensation	2,227	1,020	'	'	1,020	'	'	1,207
Issuance of units	11,499	'	'	'	'	'	'	11,499
Conversion of operating partnership units to common stock	'	23	'	'	23	'	'	-23
Conversion of operating partnership units to common stock (in shares)	'	'	'	2,186	'	'	'	'
Rebalancing of noncontrolling interest	'	-4,304	'	'	-4,304	'	'	4,304
Comprehensive income (loss)	2,632	2,277	'	'	'	'	2,277	355
Net income (loss)	-308	650	6,783	'	'	-6,133	'	-958
Balance at Sep. 30, 2013	$670,065	$598,160	$139,000	$440	$562,511	($105,697)	$1,906	$71,905
Balance (in shares) at Sep. 30, 2013	'	'	'	44,052,248	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net loss	($308)	($7,805)
Adjustment to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	49,508	28,486
Loss on impairment	'	4,563
Non-cash portion of interest expense	783	755
Intangible amortization in rental income, net	4,399	3,481
Straight-line rent adjustments, net	-2,139	-1,733
Gain on interest rate swaps	'	-215
Loss on extinguishment of debt	'	929
Gain on sales of real estate	-464	-219
Non-cash compensation expense	2,227	1,457
Issuance of units for acquisition fee	'	225
Change in assets and liabilities:	'	'
Tenant accounts receivable, net	-1,399	-317
Leasing commissions, net	-1,453	-567
Restricted cash	-764	-943
Prepaid expenses and other assets	-1,611	-716
Accounts payable, accrued expenses and other liabilities	3,539	2,308
Tenant prepaid rent and security deposits	2,270	492
Due from related parties	626	25
Total adjustments	55,522	38,011
Net cash provided by operating activities	55,214	30,206
Cash flows from investing activities:	'	'
Additions of land and building improvements	-183,882	-159,951
Proceeds from sales of rental property, net	4,843	3,216
Restricted cash	-549	3,339
Cash paid for deal deposits, net	-460	-3,675
Additions to lease intangibles	-54,842	-54,239
Net cash used in investing activities	-234,890	-211,310
Cash flows from financing activities:	'	'
Proceeds from sale of Series B Preferred stock	70,000	'
Proceeds from credit facility	'	124,300
Repayment of credit facility	'	-124,300
Proceeds from unsecured credit facility	90,000	12,000
Repayment of unsecured credit facility	-169,300	'
Proceeds from unsecured term loans	100,000	100,000
Proceeds from mortgage notes payable	'	9,252
Repayment of mortgage notes payable	-3,151	-143,985
Payment of loan fees and costs	-1,511	-2,833
Dividends and distributions	-47,671	-24,296
Proceeds from sales of common stock	154,669	237,568
Offering costs	-8,457	-10,863
Restricted cash - escrow for dividends	'	-1,553
Net cash provided by financing activities	184,579	175,290
Increase (decrease) in cash and cash equivalents	4,903	-5,814
Cash and cash equivalents-beginning of period	19,006	16,498
Cash and cash equivalents-end of period	$23,909	$10,684

Organization_and_Description_o

Organization and Description of Business	9 Months Ended
Organization and Description of Business	Sep. 30, 2013
Organization and Description of Business	'
Organization and Description of Business	'
	1. Organization and Description of Business

	STAG Industrial, Inc. (the “Company”) is an industrial operating company focused on the acquisition, ownership and management of single-tenant net-leased industrial buildings throughout the United States. The Company was formed as a Maryland corporation on July 21, 2010 and has elected to be treated as a real estate investment trust (“REIT”) under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). The Company is structured as an umbrella partnership REIT, commonly called an UPREIT, and owns substantially all of its assets and conducts substantially all of its business through its operating partnership, STAG Industrial Operating Partnership, L.P., a Delaware limited partnership (the “Operating Partnership”). As of September 30, 2013 and December 31, 2012, the Company owned an 86.46% and 85.29% limited partnership interest in the Operating Partnership, respectively. As used herein, the “Company” refers to STAG Industrial, Inc., the Operating Partnership and their consolidated subsidiaries and partnerships except where context otherwise requires.

	As of September 30, 2013, the Company owned 200 buildings in 34 states with approximately 35.3 million square feet, consisting of 136 warehouse/distribution buildings, 44 light manufacturing buildings and 20 flex/office buildings. The Company also owned one vacant land parcel adjacent to one of the Company’s buildings. The Company’s buildings were 94.0% leased to 180 tenants as of September 30, 2013.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Summary of Significant Accounting Policies	'
Summary of Significant Accounting Policies	'

	2. Summary of Significant Accounting Policies

	Interim Financial Information

	The accompanying interim financial statements have been presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q of Regulation S-X for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying interim financial statements include all adjustments, consisting of normal recurring items, necessary for their fair presentation in conformity with GAAP. Interim results are not necessarily indicative of results for a full year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

	Basis of Presentation

	The Company’s consolidated financial statements include the accounts of the Company, the Operating Partnership and their subsidiaries. The equity interests of other limited partners in the Operating Partnership held in the form of common units (“Noncontrolling Common Units” or “Common Units”) are reflected as noncontrolling interest. All significant intercompany balances and transactions have been eliminated in the consolidation and combination of entities. The financial statements of the Company are presented on a consolidated basis, for all periods presented.

	Adoption of New Accounting Pronouncements

	In February 2013, the FASB issued ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income, which requires an entity to present information about reclassification adjustments from accumulated other comprehensive income in their interim and annual financial statements in a single note or on the face of the financial statements. ASU 2013-02 was effective for the Company on January 1, 2013. The Company’s adoption of this authoritative guidance did not have a material impact on its operating results or financial position.

	Consolidated Statements of Cash Flows—Supplemental Disclosures

	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands):

		Nine months			Nine months
		ended			ended
		September 30,			September 30,
		2013			2012
	Supplemental cash flow information
	Cash paid for interest	$	14,096		$	11,132
	Supplemental schedule of non-cash investing and financing activities
	Non-cash investing activities included in additions of land and building improvements	$	(11,984	)	$	(377	)
	Issuance of Common Units for acquisitions	$	11,499		$	—
	Dividends and distributions declared but not paid	$	15,285		$	12,722

	Restricted Cash

	Restricted cash may include security deposits and cash held in escrow for real estate taxes and capital improvements as required in various mortgage loan agreements. Restricted cash also may include amounts held by the Company’s transfer agent for preferred stock dividends that are distributed subsequent to period end.

	Tenant Accounts Receivable, net

	Tenant accounts receivable, net on the Consolidated Balance Sheets, includes both tenant accounts receivable, net and accrued rental income, net. The Company provides an allowance for doubtful accounts against the portion of tenant accounts receivable that is estimated to be uncollectible. As of September 30, 2013 and December 31, 2012, the Company had an allowance for doubtful accounts of $4 thousand and $0, respectively.

	The Company accrues rental revenue earned, but not yet receivable, in accordance with GAAP. As of September 30, 2013 and December 31, 2012, the Company had accrued rental revenue of $8.5 million and $6.4 million, respectively. The Company maintains an allowance for estimated losses that may result from those revenues. If a tenant fails to make contractual payments beyond any allowance, the Company may recognize additional bad debt expense in future periods equal to the amount of unpaid rent and accrued rental revenue. As of September 30, 2013 and December 31, 2012, the Company had an allowance on accrued rental revenue of $0 and $0, respectively.

	As of September 30, 2013 and December 31, 2012, the Company had a total of approximately $4.9 million and $4.8 million, respectively, of total lease security deposits available in existing letters of credit, which are not reflected on the Company’s Consolidated Balance Sheets; and $2.8 million and $2.0 million, respectively, of lease security deposits available in cash.

	Deferred Costs

	Deferred financing fees include costs incurred in obtaining debt that are capitalized. The deferred financing fees are amortized to interest expense over the life of the respective loans, which approximates the effective interest method. Any unamortized amounts upon early repayment of debt are written off in the period of repayment. During the three and nine months ended September 30, 2013 and September 30, 2012, amortization of deferred financing fees included in interest expense was $0.3 million, $0.9 million, $0.3 million and $0.9 million, respectively. Fully amortized deferred charges are removed upon maturity of the underlying debt.

	Revenue Recognition

	By the terms of their leases, certain tenants are obligated to pay directly the costs of their buildings’ insurance, real estate taxes, ground lease payments, and certain other expenses and these costs are not reflected on the Company’s Consolidated Financial Statements. To the extent any tenant responsible for these costs under its lease defaults on its lease or it is deemed probable that the tenant will fail to pay for such costs, the Company will record a liability for such obligations. The Company estimates that real estate taxes, which are the responsibility of these certain tenants, were approximately $2.4 million, $7.0 million, $1.9 million and $4.9 million for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. This would have been the maximum liability of the Company had the tenants not met their contractual obligations. The Company does not recognize recovery revenue related to leases where the tenant has assumed the cost for real estate taxes, insurance, ground lease payments and certain other expenses.

	Income Taxes

	The Company elected to be taxed as a REIT under the Code commencing with its taxable year ended December 31, 2011 and intends to continue to qualify as a REIT. As a REIT, the Company is required to distribute at least 90% of its REIT taxable income to its stockholders and meet the various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership. The Company is generally not subject to corporate level income tax on the earnings distributed currently to its stockholders that it derives from its REIT qualifying activities. If the Company fails to qualify as a REIT in any taxable year, and is unable to avail itself of certain savings provisions set forth in the Code, all of the Company’s taxable income would be subject to federal income tax at regular corporate rates, including any applicable alternative minimum tax.

	The Company will not be required to make distributions with respect to income derived from the activities conducted through subsidiaries that the Company elects to treat as taxable REIT subsidiaries (“TRS”) for federal income tax purposes. Certain activities that the Company undertakes must be conducted by a TRS, such as performing non-customary services for its tenants and holding assets that it cannot hold directly. A TRS is subject to federal and state income taxes. The Company’s TRS did not have any activity during the three and nine months ended September 30, 2013 and September 30, 2012.

	The Company and certain of its subsidiaries are subject to certain state and local income, excise and franchise taxes. Taxes in the amount of $0.1 million, $0.3 million, $0.1 million, and $0.1 million have been recorded in other expenses in the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2013 and September 30, 2012, respectively.

	The Company currently has no liabilities for uncertain tax positions.

Real_Estate

Real Estate	9 Months Ended
Real Estate	Sep. 30, 2013
Real Estate	'
Real Estate	'
	3. Real Estate

	The following table summarizes the acquisitions of the Company during the nine months ended September 30, 2013 and the year ended December 31, 2012:

	Nine Months Ended September 30, 2013

	Building Location		Date Acquired		Square Feet		Buildings
	Orangeburg, SC		2/7/13		319,000		1
	Golden, CO		2/27/13		227,500		1
	Columbia, SC		2/28/13		273,280		1
	DeKalb, IL		3/15/13		146,740		1
	Ocala, FL		3/26/13		619,466		1
	Londonderry, NH		3/28/13		125,060		1
	Marion, IA		3/28/13		95,500		1
	Mishawaka, IN		4/5/13		308,884		1
	Southfield, MI (1)		4/9/13		113,000		1
	Houston, TX		4/9/13		201,574		1
	Idaho Falls, ID		4/11/13		90,300		1
	Mt. Prospect, IL		5/14/13		87,380		1
	Williamsport, PA		5/31/13		250,000		1
	Belvidere, IL		6/19/13		1,006,960		8
	Kentwood, MI		6/26/13		85,157		1
	Marshall, MI		6/26/13		57,025		1
	Nashville, TN		7/18/13		150,000		1
	Catoosa, OK		7/31/13		100,100		1
	New Berlin, WI		8/16/13		205,063		1
	Hampstead, MD		8/21/13		1,035,249		1
	New Hope, MN		9/20/13		107,348		1
	Springfield, OH		9/26/13		350,500		1
			Total		5,955,086		29

	(1) The Company also owns a 5.4 acre vacant land parcel adjacent to this building.

	Year Ended December 31, 2012

	Building Location		Date Acquired		Square Feet		Buildings
	East Windsor, CT		3/1/12		145,000		1
	South Bend, IN		3/8/12		225,000		1
	Lansing, MI		3/21/12		129,325		1
	Portland, ME		3/27/12		100,600		1
	Portland, TN		3/30/12		414,043		1
	Spartanburg, SC		4/5/12		409,600		4
	Franklin, IN		4/17/12		703,496		1
	Muhlenberg Township, PA		5/24/12		394,289		1
	Avon, CT		6/15/12		78,400		1
	Orlando, FL		6/15/12		155,000		1
	Pineville, NC		6/15/12		75,400		1
	Buffalo, NY		6/15/12		117,000		1
	Edgefield, SC		6/15/12		126,190		1
	Arlington, TX		6/15/12		196,000		1
	Bellevue, OH		7/18/12		181,838		1
	Atlanta, GA		8/1/12		407,981		1
	Huntersville, NC		8/6/12		185,570		1
	Simpsonville, SC		8/23/12		204,952		1
	Simpsonville, SC		8/23/12		207,042		1
	Dallas, GA		9/4/12		92,807		1
	Mebane, NC		9/4/12		223,340		1
	Mebane, NC		9/4/12		202,691		1
	De Pere, WI		9/13/12		200,000		1
	Duncan, SC		9/21/12		474,000		1
	Duncan, SC		9/21/12		313,380		1
	Buena Vista, VA		9/27/12		172,759		1
	Gurnee, IL		9/28/12		223,760		1
Auburn Hills, MI		10/9/12		87,932		1
El Paso, TX		10/9/12		269,245		1
Gloversville, NY		10/9/12		50,000		1
Gloversville, NY		10/9/12		101,589		1
Gloversville, NY		10/9/12		26,529		1
Gloversville, NY		10/9/12		59,965		1
Greenwood, SC		10/9/12		104,955		1
Greenwood, SC		10/9/12		70,100		1
Holland, MI		10/9/12		195,000		1
Independence, VA		10/9/12		120,000		1
Jackson, TN		10/9/12		250,000		1
Johnstown, NY		10/9/12		52,500		1
Johnstown, NY		10/9/12		60,000		1
Johnstown, NY		10/9/12		42,325		1
Johnstown, NY		10/9/12		57,102		1
Kansas City, KS		10/9/12		56,580		1
Lafayette, IN		10/9/12		71,400		1
Lafayette, IN		10/9/12		120,000		1
Lafayette, IN		10/9/12		275,000		1
Lansing, MI		10/9/12		250,100		1
Marion, IN		10/9/12		249,600		1
Novi, MI		10/9/12		120,800		1
O’Hara, PA		10/9/12		887,084		1
Parsons, KS		10/9/12		120,000		1
Phenix City, AL		10/9/12		117,568		1
Portage, IN		10/9/12		212,000		1
Ware Shoals, SC		10/9/12		20,514		1
Wichita, KS		10/9/12		80,850		1
Wichita, KS		10/9/12		120,000		1
Wichita, KS		10/9/12		44,760		1
Wichita, KS		10/9/12		47,700		1
Chicopee, MA		10/26/12		217,000		1
Sterling Heights, MI		10/31/12		108,000		1
Harrisonburg, VA		11/29/12		357,673		1
Toledo, OH		12/13/12		177,500		1
Woodstock, IL		12/14/12		129,803		1
Kansas City, MO		12/19/12		226,576		1
Smyrna, GA		12/20/12		102,000		1
Montgomery, IL		12/20/12		584,301		1
Statham, GA		12/21/12		225,680		1
		Total		12,829,194		70

The following table (in thousands) summarizes the allocation of the consideration paid during the nine months ended September 30, 2013 and the year ended December 31, 2012, respectively, for the acquired assets and liabilities in connection with the acquisitions of buildings at the date of acquisition identified in the table above:

		Nine months			Weighted Average		Year Ended			Weighted Average
		Ended September 30,			Amortization		December 31, 2012			Amortization Period
		2013			Period (years)					(years)
					Lease Intangibles					Lease Intangibles
Land		$	22,824		N/A		$	34,991		N/A
Buildings		160,057			N/A		269,616			N/A
Tenant improvements		1,768			N/A		10,624			N/A
Cash escrow for capital additions		—			N/A		785			N/A
Above market leases		5,915			5.7		16,728			10
Below market leases		(1,976		)	7.2		(5,962		)	6.5
In-place leases		35,654			5.7		63,397			6.6
Tenant relationships		15,246			8.4		26,241			8.2
Building and land improvements		5,470			N/A		7,488			N/A
Net assets acquired		$	246,958				$	423,908

As partial consideration for eight buildings acquired on June 19, 2013, the Company granted 555,758 Common Units in the Operating Partnership with a fair value of approximately $11.5 million based on the Company’s NYSE closing stock price on June 19, 2013. The issuance of the Common Units was effected in reliance upon an exemption from registration provided by Section 4(2) under the Securities Act of 1933, as amended. The Company relied on the exemption based on representations given by the holders of the Common Units. The remaining purchase price of approximately $40.1 million was paid in cash.

The Company has included the results of operations for each of the 29 buildings acquired in its Consolidated Statements of Operations from the date of acquisition. For the three and nine months ended September 30, 2013, the buildings acquired during the nine months ended September 30, 2013 contributed $5.7 million and $9.0 million, to total revenue and $0.4 million and $0.8 million to net loss including building acquisition costs of $0.9 million and $2.5 million related to the acquisition of the buildings, respectively.

The following tables set forth pro forma information for the nine months ended September 30, 2013 and 2012. The below pro forma information does not purport to represent what the actual results of operations of the Company would have been had the acquisitions outlined above occurred on the first day of the applicable reporting period, nor do they purport to predict the results of operations of future periods. The pro forma information has not been adjusted for property sales.

Pro Forma		Nine months ended
		September 30, 2013
		(in thousands, except share data) (1)
Total revenue		$	108,090
Net income (2)		$	5,468
Net loss attributable to common stockholders		$	(1,334	)
Weighted average shares outstanding		41,766,740
Net loss per share attributable to common stockholders		$	(0.03	)

Pro Forma		Nine months ended
		September 30, 2012
		(in thousands, except share data) (3)
Total revenue		$	88,597
Net loss (2)		$	(6,961	)
Net loss attributable to common stockholders		$	(8,677	)
Weighted average shares outstanding		21,716,590
Net loss per share attributable to common stockholders		$	(0.40	)

(1) The pro forma information for the nine months ended September 30, 2013 is presented as if the acquisition of the buildings acquired during the nine months ended September 30, 2013 had occurred at January 1, 2012, the beginning of the reporting period prior to acquisition.
(2) The net income for the nine months ended September 30, 2013 excludes $2.5 million of property acquisition costs related to the acquisition of buildings that closed during the nine months ended September 30, 2013, and the net loss for the nine months ended September 30, 2012 was adjusted to include these acquisition costs. Net loss for the nine months ended September 30, 2012 excludes $2.0 million of property acquisition costs related to the acquisition of buildings that closed during the nine months ended September 30, 2012.
(3) The pro forma information for the nine months ended September 30, 2012 is presented as if the acquisition of the buildings acquired during the nine months ended September 30, 2013 and the buildings acquired during the nine months ended September 30, 2012 had occurred at January 1, 2012 and January 1, 2011, respectively, the beginning of the reporting period prior to acquisition.

On June 12, 2013, the Company sold a 53,183 square feet flex/office building located in Pittsburgh, PA. The building represented a non-core asset of the Company. The carrying value of the building prior to sale was $4.4 million. The sales price was $5.1 million and the Company received net proceeds of $4.8 million. A gain on sale of real estate of $0.5 million was recognized at closing under the full accrual method of gain recognition. The building contributed $0 million, $0.2 million, $0.1 million, and $0.4 million to total revenue during the three and nine months ended September 30, 2013 and September 30, 2012, respectively. The results of operations and the gain on sale are included in income (loss) attributable to discontinued operations on the accompanying Consolidated Statements of Operations.

The Company tested the property located in Great Bend, KS for impairment as of September 30, 2012 utilizing a probability weighted recovery analysis of certain scenarios, and it was determined that the carrying value of the property was not recoverable from the estimated future undiscounted cash flows. Accordingly, the property was written down to its estimated fair value resulting in a loss on impairment of $3.9 million (of which $0.7 million related to lease intangibles) for the three and nine months ended September 30, 2012. Subsequently, on November 30, 2012, the Company sold the building for a purchase price of $4.0 million in an arm’s length transaction. The building represented a non-core asset of the Company. The loss on impairment and results of operations from this property are included in income (loss) attributable to discontinued operations on the accompanying Consolidated Statements of Operations. There was no loss on impairment during the three or nine months ended September 30, 2013.

Deferred_Leasing_Intangibles

Deferred Leasing Intangibles	9 Months Ended
	Sep. 30, 2013
Deferred Leasing Intangibles	'
Deferred Leasing Intangibles	'
	4. Deferred Leasing Intangibles

	Deferred leasing intangibles included in total assets consisted of the following (in thousands):

		September 30,			December 31,
		2013			2012
	In-place leases	$	132,648		$	108,363
	Less: Accumulated amortization	(43,728		)	(28,289		)
	In-place leases, net	88,920			80,074
	Above market leases	56,079			50,699
	Less: Accumulated amortization	(15,666		)	(10,362		)
	Above market leases, net	40,413			40,337
	Tenant relationships	73,728			61,050
	Less: Accumulated amortization	(16,858		)	(11,298		)
	Tenant relationships, net	56,870			49,752
	Leasing commissions	30,437			23,376
	Less: Accumulated amortization	(8,543		)	(5,984		)
	Leasing commissions, net	21,894			17,392
	Total deferred leasing intangibles, net	$	208,097		$	187,555

	Deferred leasing intangibles included in total liabilities consisted of the following (in thousands):

		September 30,			December 31,
		2013			2012
	Below market leases	$	11,091		$	9,878
	Less: Accumulated amortization	(4,220		)	(3,007		)
	Total deferred leasing intangibles, net	$	6,871		$	6,871

	Amortization expense, inclusive of results from discontinued operations, related to in-place leases, leasing commissions and tenant relationships of deferred leasing intangibles was $10.2 million, $29.3 million, $5.8 million and $15.9 million for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. Rental income, inclusive of results from discontinued operations, related to net amortization of above (below) market leases decreased by $1.5 million, $4.4 million, $1.2 million and $3.5 million for the three and nine months ended September 30, 2013 and September 30, 2012, respectively.

	Amortization related to deferred leasing intangibles over the next five years is as follows (in thousands):

		Estimated Net Amortization			Net Decrease to Rental
		of In-Place Leases,			Income Related to Above and
		Leasing Commissions and			Below Market Leases
		Tenant Relationships
	Remainder of 2013	$	10,366		$	1,505
	2014	37,284			5,734
	2015	30,004			5,928
	2016	25,078			5,610
	2017	19,024			4,098


	The Company assesses deferred leasing intangibles for impairments on a quarterly basis when certain triggering events are met. If events or changes in circumstances indicate that the carrying values of certain deferred lease intangibles may be impaired, a recovery analysis is performed based on undiscounted future cash flows expected to be generated from the tenant over the remaining lease term. If the recovery analysis indicates the carrying value of the tested lease intangibles are not recoverable from estimated future cash flows, it is written down to its estimated fair value and an impairment loss is recognized. The fair value is determined based on the contractual lease rental payments over the remaining term discounted back to the current reporting period. On June 11, 2012, the Company received notice from a tenant that the tenant was exercising an option in its lease to downsize its space from approximately 190,000 to 60,000 rentable square feet effective March 31, 2013. After determining the undiscounted future cash flows were not recoverable, the Company calculated the fair value of the lease intangibles. Using the remaining contractual lease payments for the reduced space and discounting the cash flows at a risk adjusted return for a market participant of 11.4%, it was determined that the fair value of the lease intangibles was $0.4 million, resulting in a noncash impairment loss of $0.6 million during the three and nine months ended September 30, 2012, which is reflected in the accompanying Consolidated Statements of Operations. The fair value calculation of the lease intangibles of $0.4 million was performed using Level 3 inputs, and this is a nonrecurring fair value measurement. There was no impairment of lease intangibles during the three or nine months ended September 30, 2013.

Debt

Debt	9 Months Ended
	Sep. 30, 2013
Debt	'
Debt	'
	5. Debt

	Payments on mortgage notes are generally due in monthly installments of principal amortization and interest. Payments on the Unsecured Term Loans and the Unsecured Credit Facility (each defined below) are generally due in monthly installments of interest.

	The following table sets forth a summary of the Company’s outstanding indebtedness, including mortgage notes payable and borrowings under the Company’s Unsecured Term Loans and Unsecured Credit Facility as of September 30, 2013 and December 31, 2012 (dollars in thousands):

	Loan		Interest Rate (1)	Principal		Principal		Current
				outstanding as		outstanding as		Maturity
				of		of
				September 30,		December 31,
				2013		2012
	Sun Life(2)		6.05%	$	3,884	$	4,079	Jun-1-2016
	Webster Bank (3)		4.22%	5,872		5,984		Aug-4-2016
	Bank of America Unsecured Credit Facility		LIBOR + 1.65%(4)	20,000		99,300		Sept-10-2016
	Union Fidelity (5)		5.81%	6,639		6,898		Apr-30-2017
	Webster Bank (6)		3.66%	3,141		3,203		May-29-2017
	Webster Bank (7)		3.64%	3,383		3,450		May-31-2017
	Bank of America Unsecured Term Loan		LIBOR + 1.65%(8)	150,000		150,000		Sept-10-2017
	CIGNA-1 Facility(9)		6.50%	59,071		59,645		Feb-1-2018
	CIGNA-2 Facility(10)		5.75%	60,213		60,863		Feb-1-2018
	CIGNA-3 Facility(11)		5.88%	16,935		17,097		Oct-1-2019
	Wells Fargo Unsecured Term Loan		LIBOR + 2.15%(12)	100,000		—		Feb-14-2020
	Wells Fargo CMBS Loan (13)		4.31%	67,548		68,696		Dec-1-2022
				$	496,686	$	479,215

	(1) Current interest rate as of September 30, 2013. At September 30, 2013 and December 31, 2012, the one-month LIBOR rate was 0.17885% and 0.2087%, respectively.

	(2) This $4.1 million loan with Sun Life Assurance Company of Canada (U.S.) (“Sun Life”) was assumed on October 14, 2011 in connection with the acquisition of the building located in Gahanna, OH. The property is collateral for this loan. The principal outstanding includes an unamortized fair market value premium of $0.2 million and $0.2 million as of September 30, 2013 and December 31, 2012, respectively.

	(3) This $6.2 million loan with Webster Bank, National Association (“Webster Bank”) was entered into on August 4, 2011 in connection with the acquisition of the building located in Norton, MA. The property is collateral for this loan.

	(4) The spread over LIBOR for this Bank of America, N.A. (“Bank of America”) unsecured revolving credit facility (“Unsecured Credit Facility”) is based on the Company’s consolidated leverage ratio and ranged between 1.65% and 2.25%. The spread was 1.65% as of September 30, 2013 and December 31, 2012. The Company paid unused fees of $0.2 million, $0.5 million, $40 thousand, and $40 thousand for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. The borrowing capacity as of September 30, 2013 was $180.0 million, assuming current leverage levels.

	(5) This $7.2 million loan with Union Fidelity Life Insurance Co. (“Union Fidelity”) was assumed on July 28, 2011 in connection with the acquisition of the St. Louis, MO building. The property is collateral for this loan. The principal outstanding includes an unamortized fair market value premium of $0.1 million and $0.2 million as of September 30, 2013 and December 31, 2012, respectively.

	(6) This $3.25 million loan with Webster Bank was entered into on May 29, 2012 in connection with the acquisition of the building located in Portland, ME. The property is collateral for this loan.

	(7) This $3.5 million loan with Webster Bank was entered into on May 31, 2012 in connection with the acquisition of the building located in East Windsor, CT. The property is collateral for this loan.

	(8) This Bank of America unsecured term loan (“Bank of America Unsecured Term Loan”) was entered into on September 10, 2012. The spread over LIBOR is based on the Company’s consolidated leverage ratio and ranged between 1.65% and 2.25%. The spread was 1.65% as of September 30, 2013 and December 31, 2012. The Company swapped the one-month LIBOR for a fixed rate for $100.0 million of the $150.0 million outstanding on the Bank of America Unsecured Term Loan. The net settlements of the swaps commenced on the effective date of the swaps, October 10, 2012. For further details refer to Note 6.

	(9) This Connecticut General Life Insurance Company (“CIGNA”) credit facility originally was entered into in July 2010 (the “CIGNA-1 Facility”), which loan has various buildings serving as collateral, had no remaining borrowing capacity as of September 30, 2013.

	(10) This CIGNA credit facility originally was entered into in October 2010 (the “CIGNA-2 Facility”), which loan has various buildings serving as collateral, had a remaining borrowing capacity of approximately $2.9 million as of September 30, 2013, subject to customary terms and conditions, including underwriting.

	(11) This CIGNA credit facility originally was entered into on July 8, 2011 (“CIGNA-3 Facility”), which loan has various buildings serving as collateral. The CIGNA-3 Facility had a remaining borrowing capacity of approximately $47.9 million as of September 30, 2013, subject to customary terms and conditions, including underwriting.

	(12) This Wells Fargo Bank, National Association (“Wells Fargo”) unsecured term loan (“Wells Fargo Unsecured Term Loan”) was entered into on February 14, 2013. The spread over LIBOR is based on the Company’s consolidated leverage ratio and will range between 2.15% and 2.70%. The spread was 2.15% as of September 30, 2013. The Wells Fargo Unsecured Term Loan has an accordion feature that allows the Company to increase its borrowing capacity to $250.0 million, subject to the satisfaction of certain conditions. As of September 30, 2013, the Company swapped one-month LIBOR for a fixed rate on $125.0 million of the $150.0 million capacity on the unsecured term loan (see Note 6 for further details). The borrowing capacity as of September 30, 2013 was $50.0 million, assuming current leverage levels, and can be drawn down by the Company through February 14, 2014. The Wells Fargo Unsecured Term Loan has an unused commitment fee equal to 0.35% of its unused portion, which is paid monthly in arrears. During the three months ended September 30, 2013 and the period February 14, 2013 to September 30, 2013, the Company incurred an unused fee of $0.1 million and $0.2 million, respectively.

	(13) This $68.8 million Wells Fargo loan (“CMBS Loan”) was entered into on November 8, 2012 and is a non-recourse loan with 28 buildings serving as collateral.

	On October 7, 2013, the Unsecured Credit Facility and the Bank of America Unsecured Term Loan were amended to reduce the spreads on the one-month LIBOR rate and the Base Rate and to reduce the unused fee rates. See Note 13 for further details.

	Financial Covenant Considerations

	The Company’s ability to borrow under the Unsecured Credit Facility, the Bank of America Unsecured Term Loan and the Wells Fargo Unsecured Term Loan (together, the Bank of America Unsecured Term Loan and the Wells Fargo Unsecured Term Loan are the “Unsecured Term Loans”) is subject to its ongoing compliance with a number of customary financial covenants, including:

	· a maximum consolidated leverage ratio of not greater than 0.60:1.00;

	· a maximum secured leverage ratio of not greater than 0.45:1.00;

	· a maximum unencumbered leverage ratio of not greater than 0.60:100;

· a maximum secured recourse debt ratio of not greater than 7.5%;

· a minimum fixed charge ratio of not less than 1.50 to 1.00;

· a minimum tangible net worth covenant test; and

· various thresholds on Company level investments.

If a default or event of default occurs and is continuing, the Company may be precluded from paying certain distributions (other than those required to allow it to qualify and maintain its status as a REIT) under the terms of the Unsecured Credit Facility and Unsecured Term Loans.

Each of the Sun Life loan, the Webster Bank loans, the Union Fidelity loan, the CIGNA-1 Facility, the CIGNA-2 Facility, the CIGNA-3 Facility and the CMBS Loan have specific properties that are collateral for these loans. The acquisition costs of these properties were financed by the loans and by collateral assignments of the specific leases and rents. These debt facilities contain certain financial and other covenants. The Company was in compliance with all financial covenants as of September 30, 2013 and December 31, 2012.

Fair Value of Debt

The fair value of the Company’s debt was determined by discounting the future cash flows using the current rates at which loans would be made to borrowers with similar credit ratings for loans with similar remaining maturities, similar terms, and similar loan-to-value ratios. The discount rates ranged from 1.58% to 5.24% and 1.86% to 4.64% at September 30, 2013 and December 31, 2012, respectively, and were applied to each individual debt instrument. The fair value of the Company’s debt is based on Level 3 inputs. The following table presents the aggregate carrying value of the Company’s debt and the corresponding estimate of fair value as of September 30, 2013 and December 31, 2012 (in thousands):

		September 30, 2013				December 31, 2012
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
Mortgage notes payable		$	226,686	$	230,364	$	229,915	$	242,175
Unsecured Credit Facility		$	20,000	$	20,117	$	99,300	$	99,300
Bank of America Unsecured Term Loan		$	150,000	$	150,444	$	150,000	$	150,000
Wells Fargo Unsecured Term Loan		$	100,000	$	96,951	$	—	$	—

Use_of_Derivative_Financial_In

Use of Derivative Financial Instruments	9 Months Ended
Use of Derivative Financial Instruments	Sep. 30, 2013
Use of Derivative Financial Instruments	'
Use of Derivative Financial Instruments	'
	6. Use of Derivative Financial Instruments

	Risk Management Objective of Using Derivatives

	The Company’s use of derivative instruments is limited to the utilization of interest rate swaps to manage interest rate risk exposures and not for speculative purposes. The principal objective of such arrangements is to minimize the risks and/or costs associated with the Company’s operating and financial structure, as well as to hedge specific transactions.

	On March 1, 2013, the Company entered into an interest rate swap agreement for notional amount of $25.0 million with an effective date of March 1, 2013 that converts the one-month LIBOR rate on the $25.0 million then outstanding balance of the Wells Fargo Unsecured Term Loan from a variable rate of one-month LIBOR plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio to a fixed rate of 1.33% plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio. This swap was designated as a cash flow hedge of interest rate risk.

	On June 13, 2013, the Company entered into two interest rate swap agreements for notional amounts of $50.0 million and $25.0 million with effective dates of July 1, 2013 and August 1, 2013 that convert the one-month LIBOR rate on the Wells Fargo Unsecured Term Loan from a variable rate of one-month LIBOR plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio to a fixed rate of 1.681% and 1.703%, respectively, plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio. These swaps were designated as cash flow hedges of interest rate risk.

	On September 30, 2013, the Company entered into an interest rate swap agreement for a notional amount of $25.0 million with an effective date of February 3, 2014 that converts the one-month LIBOR rate on the Wells Fargo Unsecured Term Loan from a variable rate of one-month LIBOR plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio to a fixed rate of 1.9925% plus a spread of 2.15% to 2.70% based on the Company’s consolidated leverage ratio. This swap was designated as cash flow hedge of interest rate risk. The $25.0 million notional amount has not been drawn as of September 30, 2013.

	The following table details the Company’s outstanding interest rate swaps as of September 30, 2013 (collectively, the “Unsecured Term Loan Swaps”) (in thousands):

	Interest Rate		Trade Date		Notional			Fixed Interest Rate		Variable Interest		Maturity Date
	Derivative		Trade Date		Amount			Fixed Interest Rate		Rate		Maturity Date
	Interest rate swap		Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-14-2012		$	10,000	-1	0.7975	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-20-2012		$	25,000	-1	0.7525	%	One-month LIBOR		September 10, 2017
	Interest rate swap		Sept-24-2012		$	25,000	-1	0.727	%	One-month LIBOR		September 10, 2017
	Interest rate swap		March-1-2013		$	25,000	-2	1.33	%	One-month LIBOR		February 14, 2020
	Interest rate swap		June-13-2013		$	25,000	-2	1.703	%	One-month LIBOR		February 14, 2020
	Interest rate swap		June-13-2013		$	50,000	-2	1.681	%	One-month LIBOR		February 14, 2020
	Interest rate swap		Sept-30-2013		$	25,000	-2	1.9925	%	One-month LIBOR		February 14, 2020

	(1) Fixes the interest rate of the Bank of America Unsecured Term Loan
	(2) Fixes the interest rate of the Wells Fargo Unsecured Term Loan

	The fair value of the interest rate swaps outstanding as of September 30, 2013 and December 31, 2012 was as follows (in thousands):

			Balance Sheet		Notional			Fair Value			Notional Amount			Fair Value
			Location		Amount			September 30,			December 31,			December 31,
					September 30,			2013			2012			2012
					2013
	Unsecured Term Loan Swaps		Interest Rate Swaps-Asset		$	200,000		$	2,282		$	100,000		$	(480	)
	Unsecured Term Loan Swaps		Interest Rate Swaps-Liability		$	25,000		$	(131	)	$	—		$	—

	Cash Flow Hedges of Interest Rate Risk

	The Company’s objectives in using interest rate swaps are to add stability to interest expense and to manage its exposure to interest rate movements. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company 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 qualified as cash flow hedges is recorded in accumulated other comprehensive income (loss) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. On September 14, 2012, the Company commenced a program of utilizing such designated derivatives to hedge the variable cash flows associated with certain variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three and nine months ended September 30, 2013, the Company did not record any hedge ineffectiveness related to the hedged derivatives.

	Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. The Company estimates that an additional $2.2 million will be reclassified from accumulated other comprehensive income (loss) as a decrease to interest expense over the next 12 months.

	The table below details the location in the financial statements of the gain or loss recognized on interest rate swaps designated as cash flow hedges for the three and nine months ended September 30, 2013 and September 30, 2012, respectively:

			Three months ended September 30,						Nine months ended September 30,
			2013			2012			2013			2012
	Amount of income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps (effective portion)		$	(1,510	)	$	(577	)	$	1,776		$	(577	)
	Amount of loss reclassified from accumulated other comprehensive income (loss) into income (loss) as interest expense (effective portion)		$	476		$	—		$	856		$	—
	Amount of loss recognized in income on swaps (ineffective portion and amount excluded from effectiveness testing)		$	—		$	—		$	—		$	—

	The Company is exposed to credit risk in the event of non-performance by the counterparties to the interest rate swaps. The Company minimizes this risk exposure by limiting counterparties to major banks and investment brokers who meet established credit and capital guidelines.

	Credit-risk-related Contingent Features

	As of September 30, 2013, the fair values of ten of 11 of the Company’s interest rate swaps were in an asset position of $2.5 million and one interest rate swap was in a liability position of $0.1 million, which includes accrued interest, but excludes any adjustment for nonperformance risk related to these agreements. As of September 30, 2013, the Company has not posted any collateral related to these agreements. The adjustment for nonperformance risk included in the fair value of the Company’s net asset position was $0.4 million as of September 30, 2013. If the Company had breached any of its provisions at September 30, 2013, it could have been required to settle its obligations under the agreement of the interest rate swap in a liability position at its termination value of $50 thousand.

	Fair Value of Interest Rate Swaps

The valuation of the interest rate swaps is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs including interest rate curves. The fair values of interest rate swaps are determined by using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. As of September 30, 2013 and December 31, 2012, the Company applied the provisions of this standard to the valuation of its interest rate swaps.

The following sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):

					Fair Market Measurements as of
					September 30, 2013 Using:
		September 30,			Quoted Prices			Significant			Unobservable
		2013			In Active			Other			Inputs
					Markets for			Observable			(Level 3)
					Identical Assets			Inputs
					(Level 1)			(Level 2)
Assets (liabilities):
Interest Rate Swaps		$	2,282		$	—		$	2,282		$	—
Interest Rate Swaps		$	(131	)	$	—		$	(131	)	$	—

					Fair Market Measurements as of
					December 31, 2012 Using:
		December 31,			Quoted Prices			Significant			Unobservable
		2012			In Active			Other			Inputs
					Markets for			Observable			(Level 3)
					Identical Assets			Inputs
					(Level 1)			(Level 2)
Liabilities:
Interest Rate Swaps		$	(480	)	$	—		$	(480	)	$	—

Stockholders_Equity

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2013
Stockholders' Equity	'
Stockholders' Equity	'
	7. Stockholders’ Equity

	Preferred Stock

	Pursuant to its charter, the Company is authorized to issue 10,000,000 shares of preferred stock, par value $0.01 per share. On November 2, 2011, the Company completed an underwritten public offering of 2,760,000 shares (including 360,000 shares issued pursuant to the full exercise of the underwriters’ overallotment option) of 9.0% Series A Cumulative Redeemable Preferred Stock, $0.01 par value per share (the “Series A Preferred Stock”), at a price to the public of $25.00 per share. Dividends on the Series A Preferred Stock are payable quarterly in arrears on or about the last day of March, June, September and December of each year. The Series A Preferred Stock ranks senior to the Company’s common stock with respect to dividend rights and rights upon the liquidation, dissolution or winding up of the Company. The Series A Preferred Stock has no stated maturity date and is not subject to mandatory redemption or any sinking fund. Generally, the Company is not permitted to redeem the Series A Preferred Stock prior to November 2, 2016, except in limited circumstances relating to the Company’s ability to qualify as a REIT and in certain other circumstances related to a change of control (as defined in the articles supplementary for the Series A Preferred Stock).

	On April 16, 2013, the Company completed an underwritten public offering of 2,800,000 shares (including 300,000 shares issued pursuant to the full exercise of the underwriters’ overallotment option) of 6.625% Series B Cumulative Redeemable Preferred Stock, $0.01 par value per share (the “Series B Preferred Stock”), at a price to the public of $25.00 per share. The Company received net proceeds of $67.8 million, reflecting gross proceeds of $70.0 million net of the underwriters discount of $2.2 million. The Company also incurred direct offering costs of $0.2 million. The underwriters’ discount of $2.2 million and $0.2 million of direct offering costs incurred are reflected as a reduction to additional paid-in capital in the Consolidated Balance Sheet of the Company. Dividends on the Series B Preferred Stock are payable quarterly in arrears on or about the last day of March, June, September and December of each year. The Series B Preferred Stock ranks senior to the Company’s common stock and on parity with the Company’s Series A Preferred Stock with respect to dividend rights and rights upon the liquidation, dissolution or winding up of the Company. The Series B Preferred Stock has no stated maturity date and is not subject to mandatory redemption or any sinking fund. Generally, the Company is not permitted to redeem the Series B Preferred Stock prior to April 16, 2018, except in limited circumstances relating to the Company’s ability to qualify as a REIT and in certain other circumstances related to a change of control (as defined in the articles supplementary for the Series B Preferred Stock). The Company used the net proceeds to pay off the outstanding amount due under the Unsecured Credit Facility and to fund acquisitions.

	The table below sets forth the dividends that have been declared by the Company’s board of directors on the Series A Preferred Stock during the nine months ended September 30, 2013 and the year ended December 31, 2012:

	Amount Declared During Quarter Ended 2013		Declaration Date		Per Share			Date Paid
	September 30		August 2, 2013		$	0.5625		September 30, 2013
	June 30		May 6, 2013		0.5625			July 1, 2013
	March 31		March 1, 2013		0.5625			April 1, 2013
	Total 2013				$	1.6875

	Amount Declared During Quarter Ended 2012		Declaration Date		Per Share			Date Paid
	December 31		November 2, 2012		$	0.5625		December 31, 2012
	September 30		August 2, 2012		0.5625			October 1, 2012
	June 30		May 15, 2012		0.5625			July 2, 2012
	March 31		March 6, 2012		0.5625			April 2, 2012
	Total 2012				$	2.25

	The table below sets forth the dividends that have been declared by the Company’s board of directors on the Series B Preferred Stock during the prorated period ended September 30, 2013:

	Amount Declared During Quarter Ended 2013		Declaration Date		Per Share			Date Paid
	September 30		August 2, 2013		$	0.4140625		September 30, 2013
	June 30 (prorated for April 16, 2013 to June 30, 2013)		May 6, 2013		0.34505			July 1, 2013
	Total 2013				$	0.7591125

	Common Stock

	On January 22, 2013, the Company completed an underwritten public offering of 6,284,152 shares of common stock (including 819,672 shares issued pursuant to the full exercise of the underwriters’ overallotment option) at a public offering price of $18.30 per share. The Company received net proceeds of $110.1 million, reflecting gross proceeds of $115.0 million net of the underwriters discount of $4.9 million. The Company also incurred direct offering costs of $0.2 million. The underwriters’ discount of $4.9 million and $0.2 million of direct offering costs incurred are reflected as a reduction to additional paid-in capital in the Consolidated Balance Sheet of the Company. The Company used the proceeds to fully pay down the then outstanding balance on the Unsecured Credit Facility.

	During the three and nine months ended September 30, 2013, the Company sold 1,813,970 and 1,963,170 shares of common stock, respectively, under its “at the market” program (“ATM”) that commenced on December 14, 2012. During the three months ended September 30, 2013 the Company received net proceeds of $36.4 million, reflecting gross proceeds of $36.9 million, net of the sales agents’ fees of approximately $0.6 million. During the nine months ended September 30, 2013 the Company received net proceeds of $39.1 million, reflecting gross proceeds of $39.7 million, net of the sales agents’ fees of approximately $0.6 million. The Company used the net proceeds for acquisitions and general corporate purposes. As of September 30, 2013, there was approximately $30.0 million of common stock available to be sold under the ATM.

	The table below sets forth the dividends that have been declared by the Company’s board of directors on its common stock during the nine months ended September 30, 2013 and the year ended December 31, 2012:

	Amount Declared During Quarter Ended 2013		Declaration Date		Per Share			Date Paid
	September 30		August 2, 2013		$	0.3		October 15, 2013
	June 30		May 6, 2013		0.3			July 15, 2013
	March 31		March 1, 2013		0.3			April 15, 2013
	Total 2013				$	0.9

	Amount Declared During Quarter Ended 2012		Declaration Date		Per Share			Date Paid
	December 31		November 2, 2012		$	0.27		January 15, 2013
	September 30		August 2, 2012		0.27			October 15, 2012
	June 30		May 15, 2012		0.27			July 13, 2012
	March 31		March 6, 2012		0.26			April 13, 2012
	Total 2012				$	1.07

	On August 15, 2013 the Company’s board of directors voted to increase the frequency of the payment of the Company’s common stock dividend from quarterly to monthly. For further details on the fourth quarter dividend declaration refer to Note 13.

	All of the Company’s independent directors elected to receive shares of common stock in lieu of cash for their fees for serving as members of the board and/or chairmen of various committees during 2013 and 2012. The shares of common stock are issued to the independent directors pursuant to the STAG Industrial, Inc. 2011 Equity Incentive Plan, as amended (the “2011 Plan”). The number of shares of common stock granted is calculated based on the trailing 10-day average common stock price ending on the third business day preceding the grant date. The fair value of the shares of the common stock granted is calculated based on the closing stock price per the NYSE on the grant date multiplied by the number of shares of common stock granted. The table below sets forth the grants of common stock for the members’ service during quarters ended in 2013 and 2012 as below:

	Service During Quarter Ended 2013		Grant Date		Shares		Fair Value
	September 30		October 15, 2013		2,607		$	53,000
	June 30		July 15, 2013		2,602		53,000
	March 31		April 15, 2013		2,418		52,000
	Total 2013				7,627		$	158,000

	Service During Quarter Ended 2012		Grant Date		Shares		Fair Value
	December 31		January 15, 2013		2,851		$	54,000
September 30		October 15, 2012		2,876		49,000
June 30		July 13, 2012		3,108		46,000
March 31		April 13, 2012		3,776		50,000
Total 2012				12,611		$	199,000

Restricted Stock-Based Compensation

On January 3, 2013, the Company granted 106,268 shares of time-based restricted common stock to certain employees of the Company pursuant to the 2011 Plan, with a fair value of $1.9 million ($18.11 per share).

As of September 30, 2013 and December 31, 2012, 48,173 and 16,161 shares of restricted common stock had vested with a fair value of $0.9 million and $0.2 million, respectively. The Company recognizes non-cash compensation expense ratably over the vesting period, and accordingly, the Company recognized $0.2 million, $0.6 million, $0.1 million and $0.3 million in non-cash compensation expense for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. Unrecognized compensation expense for the remaining life of the awards was $2.7 million and $1.5 million as of September 30, 2013 and December 31, 2012, respectively. As of September 30, 2013 and December 31, 2012, there were 11,540 and 1,559 forfeitures of shares of restricted common stock, respectively.

2011 Plan

At their annual meeting on May 6, 2013, the stockholders of the Company approved an amendment to the 2011 Plan that increased the number of shares of common stock that may be awarded under the 2011 Plan by 1,887,274 shares to an aggregate of 3,642,461 shares (7.5% of the shares of common stock and common units (including LTIP units) issued and outstanding as of March 27, 2013). The 2011 Plan expires on March 31, 2021.

Noncontrolling_Interest

Noncontrolling Interest	9 Months Ended
Noncontrolling Interest	Sep. 30, 2013
Noncontrolling Interest	'
Noncontrolling Interest	'
	8. Noncontrolling Interest

	Noncontrolling interests in the Operating Partnership are interests in the Operating Partnership that are not owned by the Company. As of September 30, 2013, noncontrolling interests consisted of 6,299,186 Noncontrolling Common Units and 599,464 long-term incentive plan units in the Operating Partnership (“LTIP units”), which in total represented an approximately 13.54% limited partnership interest in the Operating Partnership. As of December 31, 2012, noncontrolling interests consisted of 5,743,958 Noncontrolling Common Units and 413,551 LTIP units, which in total represented an approximately 14.71% limited partnership interest in the Operating Partnership. The Company adjusts the carrying value of noncontrolling interest to reflect its share of the book value of the Operating Partnership when there has been a change in the Company’s ownership of the Operating Partnership. Such adjustments are recorded to additional paid-in capital as a rebalancing of noncontrolling interest on the accompanying Consolidated Statements of Equity.

	Noncontrolling Common Units

	Noncontrolling Common Units and shares of the Company’s common stock have essentially the same economic characteristics in that Noncontrolling Common Units and shares of the Company’s common stock share equally in the total net income or loss distributions of the Operating Partnership. Investors who own Noncontrolling Common Units have the right to cause the Operating Partnership to redeem any or all of their Noncontrolling Common Units for cash equal to the then-current market value of one share of the Company’s common stock, or, at the Company’s election, shares of common stock on a one-for-one basis. All Noncontrolling Common Units will receive the same monthly distribution as the per share dividends on common stock. As discussed in Note 3, on June 19, 2013, the Company granted 555,758 Common Units as partial consideration for the purchase price of eight buildings. The issuance of the Common Units was effected in reliance upon an exemption from registration provided by Section 4(2) under the Securities Act of 1933, as amended. The Company relied on the exemption based on representations given by the holders of the Common Units. During the nine months ended September 30, 2013, 2,186 Noncontrolling Common Units were redeemed for shares of common stock.

	LTIP Units

	Pursuant to the 2011 Plan, the Company may grant LTIP units in the Operating Partnership. LTIP units, which the Company grants either as free-standing awards or together with other awards under the 2011 Plan, are valued by reference to the value of the Company’s common stock, and are subject to such conditions and restrictions as the compensation committee may determine, including continued employment or service, computation of financial metrics and achievement of pre-established performance goals and objectives. Vested LTIP units can be converted to Noncontrolling Common Units in the Operating Partnership on a one-for-one basis once a material equity transaction has occurred that results in the accretion of the member’s capital account to the economic equivalent of the Noncontrolling Common Unit. As of September 30, 2013, all of the outstanding LTIP units have met the aforementioned criteria and holders have the ability to convert the LTIP units to Noncontrolling Common Units. All LTIP units, whether vested or not, will receive the same monthly per unit distributions as Noncontrolling Common Units, which equal per share dividends on common stock.

	On January 3, 2013, the Company granted a total of 173,044 LTIP units to certain executive officers and 14,525 LTIP units to its non-employee, independent directors pursuant to the 2011 Plan. The fair value of the LTIP units was approximately $3.3 million, which was determined by a lattice binomial option-pricing model based on a Monte Carlo simulation using a volatility factor of 45%, a risk-free interest rate of 1.97%, an expected annual dividend yield of 6.0% and terms of 10 years. During the nine months ended September 30, 2013, 1,656 LTIP units were redeemed for Noncontrolling Common Units. As of September 30, 2013 and December 31, 2012, 200,741 and 112,506 LTIP units were vested, respectively. The Company recognized $0.4 million, $1.2 million, $0.2 million and $0.7 million in non-cash compensation expense for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. Unrecognized compensation expense was $5.6 million and $3.5 million at September 30, 2013 and December 31, 2012, respectively, and is included in additional paid-in capital on the accompanying Consolidated Statements of Equity.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2013
Earnings Per Share	'
Earnings Per Share	'
	9. Earnings Per Share

	A participating security is defined by GAAP as an unvested stock-based payment award containing non-forfeitable rights to dividends and must be included in the computation of earnings per share pursuant to the two-class method. Unvested restricted stock awards are considered participating securities as these stock-based awards contain non-forfeitable rights to dividends irrespective of whether the awards ultimately vest or expire. During the three and nine months ended September 30, 2013 and September 30, 2012, there were 214,389, 220,466, 150,978 and 157,292, respectively, unvested shares of restricted stock on a weighted average basis that were considered participating securities, which were not dilutive. For purposes of calculating basic and diluted earnings per share, awards under the 2011 Outperformance Program (the “OPP”) are considered contingently issuable shares. Because the OPP awards require the Company to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes the awards from the basic and diluted earnings per share calculation. As of September 30, 2013 and September 30, 2012, the absolute and relative return thresholds were met; however, the OPP awards have been excluded from the diluted earnings per share calculation as they were anti-dilutive.

	The following tables set forth the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2013, and September 30, 2012, respectively (in thousands, except share data).

			Three months ended
			September 30, 2013
	Numerator
	Net income from continuing operations		$	294
	Less: preferred stock dividends		2,712
	Less: amount allocable to unvested restricted stockholders		64
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(335		)
	Loss from continuing operations available to common stockholders		$	(2,147	)
	Income attributable to discontinued operations		$	—
	Less: noncontrolling interest allocable to discontinued operations		—
	Income from discontinued operations attributable to common stockholders		$	—
	Denominator
	Weighted average common shares outstanding—basic and diluted		42,753,722
	Loss from continuing operations attributable to common stockholders		$	(0.05	)
	Income from discontinued operations attributable to common stockholders		—
	Loss per share—basic and diluted		$	(0.05	)

			Nine months ended
			September 30, 2013
	Numerator
	Net loss from continuing operations		$	(874	)
	Less: preferred stock dividends		6,783
	Less: amount allocable to unvested restricted stockholders		197
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(1,034		)
	Loss from continuing operations available to common stockholders		$	(6,820	)
	Income attributable to discontinued operations		$	566
	Less: noncontrolling interest allocable to discontinued operations		76
	Income from discontinued operations attributable to common stockholders		$	490
	Denominator
	Weighted average common shares outstanding—basic and diluted		41,766,740
	Loss from continuing operations attributable to common stockholders		$	(0.16	)
	Income from discontinued operations attributable to common stockholders		0.01
	Loss per share—basic and diluted		$	(0.15	)

			Three months ended
			September 30, 2012
	Numerator
	Net loss from continuing operations		$	(1,304	)
	Less: preferred stock dividends		1,553
	Less: Amount allocable to unvested restricted stockholders		41
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(551		)
	Loss from continuing operations available to common stockholders		$	(2,347	)
	Income attributable to discontinued operations		$	(3,612	)
	Less: noncontrolling interest allocable to discontinued operations		(697		)
	Income from discontinued operations available to common stockholders		$	(2,915	)
	Denominator
	Weighted average common shares outstanding—basic and diluted		29,752,057
	Loss from continuing operations attributable to common stockholders		$	(0.08	)
	Discontinued operations		(0.10		)
	Loss per common share—basic and diluted		$	(0.18	)

			Nine months ended
			September 30, 2012
	Numerator
	Net loss from continuing operations		$	(4,647	)
	Less: preferred stock dividends		4,659
	Less: Amount allocable to unvested restricted stockholders		81
Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(2,422		)
Loss from continuing operations available to common stockholders		$	(6,965	)
Income attributable to discontinued operations		$	(3,158	)
Less: noncontrolling interest allocable to discontinued operations		(822		)
Income from discontinued operations available to common stockholders		$	(2,336	)
Denominator
Weighted average common shares outstanding—basic and diluted		21,716,590
Loss from continuing operations attributable to common stockholders		$	(0.32	)
Discontinued operations		(0.11		)
Loss per common share—basic and diluted		$	(0.43	)

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments and Contingencies	'
Commitments and Contingencies	'

	10. Commitments and Contingencies

	The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance subject to deductible requirements. Management believes that the ultimate settlement of these actions will not have a material adverse effect on the Company’s financial position, results of operations or cash flows.

	The Company is subject to a one-time incentive fee based on aggregate performance thresholds of the acquired buildings sourced by Columbus Nova Real Estate Acquisition Group, LLC. At September 30, 2013 and December 31, 2012, the fair value of the incentive fee was zero.

Concentrations_of_Credit_Risk

Concentrations of Credit Risk	9 Months Ended
Concentrations of Credit Risk	Sep. 30, 2013
Concentrations of Credit Risk	'
Concentrations of Credit Risk	'
	11. Concentrations of Credit Risk

	Concentrations of credit risk arise when a number of tenants related to the Company’s investments or rental operations are engaged in similar business activities, are located in the same geographic region, or have similar economic features that would cause their inability to meet contractual obligations, including those to the Company, to be similarly affected. The Company regularly monitors its tenant base to assess potential concentrations of credit risk. Management believes the current credit risk portfolio is reasonably well diversified and does not contain any unusual concentration of credit risk. No single tenant accounted for more than 5% of rental income for the three and nine months ended September 30, 2013 and September 30, 2012.

Related_Party_Transaction

Related Party Transaction	9 Months Ended
Related Party Transaction	Sep. 30, 2013
Related Party Transaction	'
Related Party Transaction	'
	12. Related Party Transaction

	In June 2013, STAG Investments II, LLC (“Fund II”), a private, fully-invested fund that is an affiliate of the Company, and the Company amended the Services Agreement, dated as of April 20, 2011, pursuant to which the Company provides asset management services to Fund II in return for an annual asset management fee. The Services Agreement was amended to exclude disposition services from the asset management services to be performed by the Company and results in a concomitant reduction in the asset management fee. The asset management fee is based on the equity investments in the Fund II assets and is currently equal to 1.25% of the equity investment.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events	'
Subsequent Events	'
	13. Subsequent Events

	GAAP requires an entity to disclose events that occur after the balance sheet date but before financial statements are issued or are available to be issued (“subsequent events”) as well as the date through which an entity has evaluated subsequent events. There are two types of subsequent events. The first type consists of events or transactions that provide additional evidence about conditions that existed at the date of the balance sheet, including the estimates inherent in the process of preparing financial statements (“recognized subsequent events”). No significant recognized subsequent events were noted. The second type consists of events that provide evidence about conditions that did not exist at the date of the balance sheet but arose subsequent to that date (“non-recognized subsequent events”).

	The following non-recognized subsequent events are noted:

	On August 15, 2013, the Company’s board of directors voted to increase the frequency of the payment of the Company’s common stock dividend from quarterly to monthly. On September 24, 2013, the Company’s board of directors declared dividends on the Company’s common stock for each month of the fourth quarter of $0.10 per share, which equates to $0.30 per share on a quarterly basis, payable on November 15, 2013, December 16, 2013 and January 15, 2014.

	On October 7, 2013, the Unsecured Credit Facility and the Bank of America Unsecured Term Loan were amended to reduce the spreads on the one-month Eurodollar Rate rate and the Base Rate (each as defined in the credit agreement) and to reduce the unused fee rates. The following table compares the original terms to the amended terms of the Unsecured Credit Facility and the Bank of America Unsecured Term Loan.

		Original Terms
		Unsecured Credit Facility and	Amended Terms
	Applicable Rates	Unsecured Term Loan	Unsecured Credit Facility	Unsecured Term Loan
	Eurodollar Rate (1):	one month-LIBOR + 165.0 bps - 225.0 bps	one month-LIBOR + 145.0 bps - 205.0 bps	one month-LIBOR + 140.0 bps - 200.0 bps
	Base Rate (1):	Base rate + 65.0 bps - 125.0 bps	Base rate + 45.0 bps - 105.0 bps	Base rate + 40.0 bps - 100.0 bps
	Unused Fees:	<50%, 35.0 bps; > 50%, 25 bps	<50%, 25.0 bps; > 50%, 20 bps	—

	(1) The spread over the applicable rate is based on the Company’s consolidated leverage ratio.

	On November 1, 2013, the board of directors appointed Virgis W. Colbert to serve as a member of the board of directors, effective January 1, 2014.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Summary of Significant Accounting Policies	'
Basis of Presentation	'
	Basis of Presentation

	The Company’s consolidated financial statements include the accounts of the Company, the Operating Partnership and their subsidiaries. The equity interests of other limited partners in the Operating Partnership held in the form of common units (“Noncontrolling Common Units” or “Common Units”) are reflected as noncontrolling interest. All significant intercompany balances and transactions have been eliminated in the consolidation and combination of entities. The financial statements of the Company are presented on a consolidated basis, for all periods presented.
Adoption of New Accounting Pronouncements	'
	Adoption of New Accounting Pronouncements

	In February 2013, the FASB issued ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income, which requires an entity to present information about reclassification adjustments from accumulated other comprehensive income in their interim and annual financial statements in a single note or on the face of the financial statements. ASU 2013-02 was effective for the Company on January 1, 2013. The Company’s adoption of this authoritative guidance did not have a material impact on its operating results or financial position.
Consolidated and Combined Statements of Cash Flows-Supplemental Disclosures	'
	Consolidated Statements of Cash Flows—Supplemental Disclosures

	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands):

		Nine months			Nine months
		ended			ended
		September 30,			September 30,
		2013			2012
	Supplemental cash flow information
	Cash paid for interest	$	14,096		$	11,132
	Supplemental schedule of non-cash investing and financing activities
	Non-cash investing activities included in additions of land and building improvements	$	(11,984	)	$	(377	)
	Issuance of Common Units for acquisitions	$	11,499		$	—
	Dividends and distributions declared but not paid	$	15,285		$	12,722
Restricted Cash	'
	Restricted Cash

	Restricted cash may include security deposits and cash held in escrow for real estate taxes and capital improvements as required in various mortgage loan agreements. Restricted cash also may include amounts held by the Company’s transfer agent for preferred stock dividends that are distributed subsequent to period end.
Tenant Accounts Receivable, net	'
	Tenant Accounts Receivable, net

	Tenant accounts receivable, net on the Consolidated Balance Sheets, includes both tenant accounts receivable, net and accrued rental income, net. The Company provides an allowance for doubtful accounts against the portion of tenant accounts receivable that is estimated to be uncollectible. As of September 30, 2013 and December 31, 2012, the Company had an allowance for doubtful accounts of $4 thousand and $0, respectively.

	The Company accrues rental revenue earned, but not yet receivable, in accordance with GAAP. As of September 30, 2013 and December 31, 2012, the Company had accrued rental revenue of $8.5 million and $6.4 million, respectively. The Company maintains an allowance for estimated losses that may result from those revenues. If a tenant fails to make contractual payments beyond any allowance, the Company may recognize additional bad debt expense in future periods equal to the amount of unpaid rent and accrued rental revenue. As of September 30, 2013 and December 31, 2012, the Company had an allowance on accrued rental revenue of $0 and $0, respectively.

	As of September 30, 2013 and December 31, 2012, the Company had a total of approximately $4.9 million and $4.8 million, respectively, of total lease security deposits available in existing letters of credit, which are not reflected on the Company’s Consolidated Balance Sheets; and $2.8 million and $2.0 million, respectively, of lease security deposits available in cash.
Deferred Costs	'
	Deferred Costs

	Deferred financing fees include costs incurred in obtaining debt that are capitalized. The deferred financing fees are amortized to interest expense over the life of the respective loans, which approximates the effective interest method. Any unamortized amounts upon early repayment of debt are written off in the period of repayment. During the three and nine months ended September 30, 2013 and September 30, 2012, amortization of deferred financing fees included in interest expense was $0.3 million, $0.9 million, $0.3 million and $0.9 million, respectively. Fully amortized deferred charges are removed upon maturity of the underlying debt.
Revenue Recognition	'
	Revenue Recognition

	By the terms of their leases, certain tenants are obligated to pay directly the costs of their buildings’ insurance, real estate taxes, ground lease payments, and certain other expenses and these costs are not reflected on the Company’s Consolidated Financial Statements. To the extent any tenant responsible for these costs under its lease defaults on its lease or it is deemed probable that the tenant will fail to pay for such costs, the Company will record a liability for such obligations. The Company estimates that real estate taxes, which are the responsibility of these certain tenants, were approximately $2.4 million, $7.0 million, $1.9 million and $4.9 million for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. This would have been the maximum liability of the Company had the tenants not met their contractual obligations. The Company does not recognize recovery revenue related to leases where the tenant has assumed the cost for real estate taxes, insurance, ground lease payments and certain other expenses.
Income Taxes	'
	Income Taxes

	The Company elected to be taxed as a REIT under the Code commencing with its taxable year ended December 31, 2011 and intends to continue to qualify as a REIT. As a REIT, the Company is required to distribute at least 90% of its REIT taxable income to its stockholders and meet the various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership. The Company is generally not subject to corporate level income tax on the earnings distributed currently to its stockholders that it derives from its REIT qualifying activities. If the Company fails to qualify as a REIT in any taxable year, and is unable to avail itself of certain savings provisions set forth in the Code, all of the Company’s taxable income would be subject to federal income tax at regular corporate rates, including any applicable alternative minimum tax.

	The Company will not be required to make distributions with respect to income derived from the activities conducted through subsidiaries that the Company elects to treat as taxable REIT subsidiaries (“TRS”) for federal income tax purposes. Certain activities that the Company undertakes must be conducted by a TRS, such as performing non-customary services for its tenants and holding assets that it cannot hold directly. A TRS is subject to federal and state income taxes. The Company’s TRS did not have any activity during the three and nine months ended September 30, 2013 and September 30, 2012.

	The Company and certain of its subsidiaries are subject to certain state and local income, excise and franchise taxes. Taxes in the amount of $0.1 million, $0.3 million, $0.1 million, and $0.1 million have been recorded in other expenses in the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2013 and September 30, 2012, respectively.

	The Company currently has no liabilities for uncertain tax positions.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Summary of Significant Accounting Policies	'
Schedule of supplemental disclosures related to the Consolidated and Combined Statements of Cash Flows	'
	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands):

		Nine months			Nine months
		ended			ended
		September 30,			September 30,
		2013			2012
	Supplemental cash flow information
	Cash paid for interest	$	14,096		$	11,132
	Supplemental schedule of non-cash investing and financing activities
	Non-cash investing activities included in additions of land and building improvements	$	(11,984	)	$	(377	)
	Issuance of Common Units for acquisitions	$	11,499		$	—
	Dividends and distributions declared but not paid	$	15,285		$	12,722

Real_Estate_Tables

Real Estate (Tables)	9 Months Ended
Real Estate (Tables)	Sep. 30, 2013
Real Estate	'
Summary of acquisitions of the Company	'
	Nine Months Ended September 30, 2013

	Building Location		Date Acquired		Square Feet		Buildings
	Orangeburg, SC		2/7/13		319,000		1
	Golden, CO		2/27/13		227,500		1
	Columbia, SC		2/28/13		273,280		1
	DeKalb, IL		3/15/13		146,740		1
	Ocala, FL		3/26/13		619,466		1
	Londonderry, NH		3/28/13		125,060		1
	Marion, IA		3/28/13		95,500		1
	Mishawaka, IN		4/5/13		308,884		1
	Southfield, MI (1)		4/9/13		113,000		1
	Houston, TX		4/9/13		201,574		1
	Idaho Falls, ID		4/11/13		90,300		1
	Mt. Prospect, IL		5/14/13		87,380		1
	Williamsport, PA		5/31/13		250,000		1
	Belvidere, IL		6/19/13		1,006,960		8
	Kentwood, MI		6/26/13		85,157		1
	Marshall, MI		6/26/13		57,025		1
	Nashville, TN		7/18/13		150,000		1
	Catoosa, OK		7/31/13		100,100		1
	New Berlin, WI		8/16/13		205,063		1
	Hampstead, MD		8/21/13		1,035,249		1
	New Hope, MN		9/20/13		107,348		1
	Springfield, OH		9/26/13		350,500		1
			Total		5,955,086		29

	(1) The Company also owns a 5.4 acre vacant land parcel adjacent to this building.

	Year Ended December 31, 2012

	Building Location		Date Acquired		Square Feet		Buildings
	East Windsor, CT		3/1/12		145,000		1
	South Bend, IN		3/8/12		225,000		1
	Lansing, MI		3/21/12		129,325		1
	Portland, ME		3/27/12		100,600		1
	Portland, TN		3/30/12		414,043		1
	Spartanburg, SC		4/5/12		409,600		4
	Franklin, IN		4/17/12		703,496		1
	Muhlenberg Township, PA		5/24/12		394,289		1
	Avon, CT		6/15/12		78,400		1
	Orlando, FL		6/15/12		155,000		1
	Pineville, NC		6/15/12		75,400		1
	Buffalo, NY		6/15/12		117,000		1
	Edgefield, SC		6/15/12		126,190		1
	Arlington, TX		6/15/12		196,000		1
	Bellevue, OH		7/18/12		181,838		1
	Atlanta, GA		8/1/12		407,981		1
	Huntersville, NC		8/6/12		185,570		1
	Simpsonville, SC		8/23/12		204,952		1
	Simpsonville, SC		8/23/12		207,042		1
	Dallas, GA		9/4/12		92,807		1
	Mebane, NC		9/4/12		223,340		1
	Mebane, NC		9/4/12		202,691		1
	De Pere, WI		9/13/12		200,000		1
	Duncan, SC		9/21/12		474,000		1
	Duncan, SC		9/21/12		313,380		1
	Buena Vista, VA		9/27/12		172,759		1
	Gurnee, IL		9/28/12		223,760		1
	Auburn Hills, MI		10/9/12		87,932		1
	El Paso, TX		10/9/12		269,245		1
	Gloversville, NY		10/9/12		50,000		1
	Gloversville, NY		10/9/12		101,589		1
Gloversville, NY		10/9/12		26,529		1
Gloversville, NY		10/9/12		59,965		1
Greenwood, SC		10/9/12		104,955		1
Greenwood, SC		10/9/12		70,100		1
Holland, MI		10/9/12		195,000		1
Independence, VA		10/9/12		120,000		1
Jackson, TN		10/9/12		250,000		1
Johnstown, NY		10/9/12		52,500		1
Johnstown, NY		10/9/12		60,000		1
Johnstown, NY		10/9/12		42,325		1
Johnstown, NY		10/9/12		57,102		1
Kansas City, KS		10/9/12		56,580		1
Lafayette, IN		10/9/12		71,400		1
Lafayette, IN		10/9/12		120,000		1
Lafayette, IN		10/9/12		275,000		1
Lansing, MI		10/9/12		250,100		1
Marion, IN		10/9/12		249,600		1
Novi, MI		10/9/12		120,800		1
O’Hara, PA		10/9/12		887,084		1
Parsons, KS		10/9/12		120,000		1
Phenix City, AL		10/9/12		117,568		1
Portage, IN		10/9/12		212,000		1
Ware Shoals, SC		10/9/12		20,514		1
Wichita, KS		10/9/12		80,850		1
Wichita, KS		10/9/12		120,000		1
Wichita, KS		10/9/12		44,760		1
Wichita, KS		10/9/12		47,700		1
Chicopee, MA		10/26/12		217,000		1
Sterling Heights, MI		10/31/12		108,000		1
Harrisonburg, VA		11/29/12		357,673		1
Toledo, OH		12/13/12		177,500		1
Woodstock, IL		12/14/12		129,803		1
Kansas City, MO		12/19/12		226,576		1
Smyrna, GA		12/20/12		102,000		1
Montgomery, IL		12/20/12		584,301		1
Statham, GA		12/21/12		225,680		1
		Total		12,829,194		70
Summary of allocation of the consideration paid for the acquired assets and liabilities in connection with the acquisition of buildings at the date of acquisition	'
	The following table (in thousands) summarizes the allocation of the consideration paid during the nine months ended September 30, 2013 and the year ended December 31, 2012, respectively, for the acquired assets and liabilities in connection with the acquisitions of buildings at the date of acquisition identified in the table above:

			Nine months			Weighted Average		Year Ended			Weighted Average
			Ended September 30,			Amortization		December 31, 2012			Amortization Period
			2013			Period (years)					(years)
						Lease Intangibles					Lease Intangibles
	Land		$	22,824		N/A		$	34,991		N/A
	Buildings		160,057			N/A		269,616			N/A
	Tenant improvements		1,768			N/A		10,624			N/A
	Cash escrow for capital additions		—			N/A		785			N/A
	Above market leases		5,915			5.7		16,728			10
	Below market leases		(1,976		)	7.2		(5,962		)	6.5
	In-place leases		35,654			5.7		63,397			6.6
	Tenant relationships		15,246			8.4		26,241			8.2
	Building and land improvements		5,470			N/A		7,488			N/A
	Net assets acquired		$	246,958				$	423,908
Schedule of pro forma information presented as if, the acquisitions of the buildings had occurred at the beginning of the previous fiscal period	'

	Pro Forma		Nine months ended
			September 30, 2013
			(in thousands, except share data) (1)
	Total revenue		$	108,090
	Net income (2)		$	5,468
	Net loss attributable to common stockholders		$	(1,334	)
	Weighted average shares outstanding		41,766,740
	Net loss per share attributable to common stockholders		$	(0.03	)

	Pro Forma		Nine months ended
			September 30, 2012
			(in thousands, except share data) (3)
	Total revenue		$	88,597
	Net loss (2)		$	(6,961	)
	Net loss attributable to common stockholders		$	(8,677	)
	Weighted average shares outstanding		21,716,590
	Net loss per share attributable to common stockholders		$	(0.40	)

	(1) The pro forma information for the nine months ended September 30, 2013 is presented as if the acquisition of the buildings acquired during the nine months ended September 30, 2013 had occurred at January 1, 2012, the beginning of the reporting period prior to acquisition.
	(2) The net income for the nine months ended September 30, 2013 excludes $2.5 million of property acquisition costs related to the acquisition of buildings that closed during the nine months ended September 30, 2013, and the net loss for the nine months ended September 30, 2012 was adjusted to include these acquisition costs. Net loss for the nine months ended September 30, 2012 excludes $2.0 million of property acquisition costs related to the acquisition of buildings that closed during the nine months ended September 30, 2012.
	(3) The pro forma information for the nine months ended September 30, 2012 is presented as if the acquisition of the buildings acquired during the nine months ended September 30, 2013 and the buildings acquired during the nine months ended September 30, 2012 had occurred at January 1, 2012 and January 1, 2011, respectively, the beginning of the reporting period prior to acquisition.

Deferred_Leasing_Intangibles_T

Deferred Leasing Intangibles (Tables)	9 Months Ended
	Sep. 30, 2013
Deferred Leasing Intangibles	'
Schedule of deferred leasing intangibles included in total assets	'
	Deferred leasing intangibles included in total assets consisted of the following (in thousands):

		September 30,			December 31,
		2013			2012
	In-place leases	$	132,648		$	108,363
	Less: Accumulated amortization	(43,728		)	(28,289		)
	In-place leases, net	88,920			80,074
	Above market leases	56,079			50,699
	Less: Accumulated amortization	(15,666		)	(10,362		)
	Above market leases, net	40,413			40,337
	Tenant relationships	73,728			61,050
	Less: Accumulated amortization	(16,858		)	(11,298		)
	Tenant relationships, net	56,870			49,752
	Leasing commissions	30,437			23,376
	Less: Accumulated amortization	(8,543		)	(5,984		)
	Leasing commissions, net	21,894			17,392
	Total deferred leasing intangibles, net	$	208,097		$	187,555
Schedule of deferred leasing intangibles included in total liabilities	'

	Deferred leasing intangibles included in total liabilities consisted of the following (in thousands):

		September 30,			December 31,
		2013			2012
	Below market leases	$	11,091		$	9,878
	Less: Accumulated amortization	(4,220		)	(3,007		)
	Total deferred leasing intangibles, net	$	6,871		$	6,871
Schedule of amortization related to deferred leasing intangibles over the next five years	'
	Amortization related to deferred leasing intangibles over the next five years is as follows (in thousands):

		Estimated Net Amortization			Net Decrease to Rental
		of In-Place Leases,			Income Related to Above and
		Leasing Commissions and			Below Market Leases
		Tenant Relationships
	Remainder of 2013	$	10,366		$	1,505
	2014	37,284			5,734
	2015	30,004			5,928
	2016	25,078			5,610
	2017	19,024			4,098

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt	'
Summary of the mortgage notes payable, unsecured term loans and credit facility	'
	The following table sets forth a summary of the Company’s outstanding indebtedness, including mortgage notes payable and borrowings under the Company’s Unsecured Term Loans and Unsecured Credit Facility as of September 30, 2013 and December 31, 2012 (dollars in thousands):

	Loan	Interest Rate (1)		Principal			Principal			Current
				outstanding as			outstanding as			Maturity
				of			of
				September 30,			December 31,
				2013			2012
	Sun Life(2)	6.05%		$	3,884		$	4,079		Jun-1-2016
	Webster Bank (3)	4.22%		5,872			5,984			Aug-4-2016
	Bank of America Unsecured Credit Facility	LIBOR + 1.65%(4)		20,000			99,300			Sept-10-2016
	Union Fidelity (5)	5.81%		6,639			6,898			Apr-30-2017
	Webster Bank (6)	3.66%		3,141			3,203			May-29-2017
	Webster Bank (7)	3.64%		3,383			3,450			May-31-2017
	Bank of America Unsecured Term Loan	LIBOR + 1.65%(8)		150,000			150,000			Sept-10-2017
	CIGNA-1 Facility(9)	6.50%		59,071			59,645			Feb-1-2018
	CIGNA-2 Facility(10)	5.75%		60,213			60,863			Feb-1-2018
	CIGNA-3 Facility(11)	5.88%		16,935			17,097			Oct-1-2019
	Wells Fargo Unsecured Term Loan	LIBOR + 2.15%(12)		100,000			—			Feb-14-2020
	Wells Fargo CMBS Loan (13)	4.31%		67,548			68,696			Dec-1-2022
				$	496,686		$	479,215

	(1) Current interest rate as of September 30, 2013. At September 30, 2013 and December 31, 2012, the one-month LIBOR rate was 0.17885% and 0.2087%, respectively.

	(2) This $4.1 million loan with Sun Life Assurance Company of Canada (U.S.) (“Sun Life”) was assumed on October 14, 2011 in connection with the acquisition of the building located in Gahanna, OH. The property is collateral for this loan. The principal outstanding includes an unamortized fair market value premium of $0.2 million and $0.2 million as of September 30, 2013 and December 31, 2012, respectively.

	(3) This $6.2 million loan with Webster Bank, National Association (“Webster Bank”) was entered into on August 4, 2011 in connection with the acquisition of the building located in Norton, MA. The property is collateral for this loan.

	(4) The spread over LIBOR for this Bank of America, N.A. (“Bank of America”) unsecured revolving credit facility (“Unsecured Credit Facility”) is based on the Company’s consolidated leverage ratio and ranged between 1.65% and 2.25%. The spread was 1.65% as of September 30, 2013 and December 31, 2012. The Company paid unused fees of $0.2 million, $0.5 million, $40 thousand, and $40 thousand for the three and nine months ended September 30, 2013 and September 30, 2012, respectively. The borrowing capacity as of September 30, 2013 was $180.0 million, assuming current leverage levels.

	(5) This $7.2 million loan with Union Fidelity Life Insurance Co. (“Union Fidelity”) was assumed on July 28, 2011 in connection with the acquisition of the St. Louis, MO building. The property is collateral for this loan. The principal outstanding includes an unamortized fair market value premium of $0.1 million and $0.2 million as of September 30, 2013 and December 31, 2012, respectively.

	(6) This $3.25 million loan with Webster Bank was entered into on May 29, 2012 in connection with the acquisition of the building located in Portland, ME. The property is collateral for this loan.

	(7) This $3.5 million loan with Webster Bank was entered into on May 31, 2012 in connection with the acquisition of the building located in East Windsor, CT. The property is collateral for this loan.

	(8) This Bank of America unsecured term loan (“Bank of America Unsecured Term Loan”) was entered into on September 10, 2012. The spread over LIBOR is based on the Company’s consolidated leverage ratio and ranged between 1.65% and 2.25%. The spread was 1.65% as of September 30, 2013 and December 31, 2012. The Company swapped the one-month LIBOR for a fixed rate for $100.0 million of the $150.0 million outstanding on the Bank of America Unsecured Term Loan. The net settlements of the swaps commenced on the effective date of the swaps, October 10, 2012. For further details refer to Note 6.

	(9) This Connecticut General Life Insurance Company (“CIGNA”) credit facility originally was entered into in July 2010 (the “CIGNA-1 Facility”), which loan has various buildings serving as collateral, had no remaining borrowing capacity as of September 30, 2013.

	(10) This CIGNA credit facility originally was entered into in October 2010 (the “CIGNA-2 Facility”), which loan has various buildings serving as collateral, had a remaining borrowing capacity of approximately $2.9 million as of September 30, 2013, subject to customary terms and conditions, including underwriting.

	(11) This CIGNA credit facility originally was entered into on July 8, 2011 (“CIGNA-3 Facility”), which loan has various buildings serving as collateral. The CIGNA-3 Facility had a remaining borrowing capacity of approximately $47.9 million as of September 30, 2013, subject to customary terms and conditions, including underwriting.

	(12) This Wells Fargo Bank, National Association (“Wells Fargo”) unsecured term loan (“Wells Fargo Unsecured Term Loan”) was entered into on February 14, 2013. The spread over LIBOR is based on the Company’s consolidated leverage ratio and will range between 2.15% and 2.70%. The spread was 2.15% as of September 30, 2013. The Wells Fargo Unsecured Term Loan has an accordion feature that allows the Company to increase its borrowing capacity to $250.0 million, subject to the satisfaction of certain conditions. As of September 30, 2013, the Company swapped one-month LIBOR for a fixed rate on $125.0 million of the $150.0 million capacity on the unsecured term loan (see Note 6 for further details). The borrowing capacity as of September 30, 2013 was $50.0 million, assuming current leverage levels, and can be drawn down by the Company through February 14, 2014. The Wells Fargo Unsecured Term Loan has an unused commitment fee equal to 0.35% of its unused portion, which is paid monthly in arrears. During the three months ended September 30, 2013 and the period February 14, 2013 to September 30, 2013, the Company incurred an unused fee of $0.1 million and $0.2 million, respectively.

	(13) This $68.8 million Wells Fargo loan (“CMBS Loan”) was entered into on November 8, 2012 and is a non-recourse loan with 28 buildings serving as collateral.
Schedule of aggregate carrying value of the debt and the corresponding estimate of fair value	'
	The following table presents the aggregate carrying value of the Company’s debt and the corresponding estimate of fair value as of September 30, 2013 and December 31, 2012 (in thousands):

		September 30, 2013						December 31, 2012
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
	Mortgage notes payable	$	226,686		$	230,364		$	229,915		$	242,175
	Unsecured Credit Facility	$	20,000		$	20,117		$	99,300		$	99,300
	Bank of America Unsecured Term Loan	$	150,000		$	150,444		$	150,000		$	150,000
	Wells Fargo Unsecured Term Loan	$	100,000		$	96,951		$	—		$	—

Use_of_Derivative_Financial_In1

Use of Derivative Financial Instruments (Tables)	9 Months Ended
Use of Derivative Financial Instruments (Tables)	Sep. 30, 2013
Use of Derivative Financial Instruments	'
Schedule of swaps designated as cash flow hedges of interest rate risk collectively referred to as Unsecured Term Loan Swaps	'
	The following table details the Company’s outstanding interest rate swaps as of September 30, 2013 (collectively, the “Unsecured Term Loan Swaps”) (in thousands):

	Interest Rate	Trade Date		Notional			Fixed Interest Rate		Variable Interest		Maturity Date
	Derivative	Trade Date		Amount			Fixed Interest Rate		Rate		Maturity Date
	Interest rate swap	Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-14-2012		$	10,000	-1	0.7945	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-14-2012		$	10,000	-1	0.7975	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-20-2012		$	25,000	-1	0.7525	%	One-month LIBOR		September 10, 2017
	Interest rate swap	Sept-24-2012		$	25,000	-1	0.727	%	One-month LIBOR		September 10, 2017
	Interest rate swap	March-1-2013		$	25,000	-2	1.33	%	One-month LIBOR		February 14, 2020
	Interest rate swap	June-13-2013		$	25,000	-2	1.703	%	One-month LIBOR		February 14, 2020
	Interest rate swap	June-13-2013		$	50,000	-2	1.681	%	One-month LIBOR		February 14, 2020
	Interest rate swap	Sept-30-2013		$	25,000	-2	1.9925	%	One-month LIBOR		February 14, 2020

	(1) Fixes the interest rate of the Bank of America Unsecured Term Loan
	(2) Fixes the interest rate of the Wells Fargo Unsecured Term Loan
Summary of the fair value of interest rate swap outstanding	'
	The fair value of the interest rate swaps outstanding as of September 30, 2013 and December 31, 2012 was as follows (in thousands):

		Balance Sheet		Notional			Fair Value			Notional Amount			Fair Value
		Location		Amount			September 30,			December 31,			December 31,
				September 30,			2013			2012			2012
				2013
	Unsecured Term Loan Swaps	Interest Rate Swaps-Asset		$	200,000		$	2,282		$	100,000		$	(480	)
	Unsecured Term Loan Swaps	Interest Rate Swaps-Liability		$	25,000		$	(131	)	$	—		$	—
Schedule of location in the financial statements of the gain (loss) recognized on interest rate swaps designated as cash flow hedges	'


		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Amount of income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps (effective portion)	$	(1,510	)	$	(577	)	$	1,776		$	(577	)
	Amount of loss reclassified from accumulated other comprehensive income (loss) into income (loss) as interest expense (effective portion)	$	476		$	—		$	856		$	—
	Amount of loss recognized in income on swaps (ineffective portion and amount excluded from effectiveness testing)	$	—		$	—		$	—		$	—
Schedule of interest rate swaps that are accounted for at fair value on a recurring basis	'
	The following sets forth the Company’s financial instruments that are accounted for at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):

					Fair Market Measurements as of
					September 30, 2013 Using:
		September 30,			Quoted Prices			Significant			Unobservable
		2013			In Active			Other			Inputs
					Markets for			Observable			(Level 3)
					Identical Assets			Inputs
					(Level 1)			(Level 2)
	Assets (liabilities):
	Interest Rate Swaps	$	2,282		$	—		$	2,282		$	—
	Interest Rate Swaps	$	(131	)	$	—		$	(131	)	$	—

					Fair Market Measurements as of
					December 31, 2012 Using:
		December 31,			Quoted Prices			Significant			Unobservable
		2012			In Active			Other			Inputs
					Markets for			Observable			(Level 3)
					Identical Assets			Inputs
					(Level 1)			(Level 2)
	Liabilities:
	Interest Rate Swaps	$	(480	)	$	—		$	(480	)	$	—

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
Stockholders' Equity (Tables)	Sep. 30, 2013
Stockholders' Equity	'
Schedule of grants of common stock for the members' service	'

	Service During Quarter Ended 2013	Grant Date	Shares		Fair Value
	September 30	October 15, 2013	2,607		$	53,000
	June 30	July 15, 2013	2,602		53,000
	March 31	April 15, 2013	2,418		52,000
	Total 2013		7,627		$	158,000

	Service During Quarter Ended 2012	Grant Date	Shares		Fair Value
	December 31	January 15, 2013	2,851		$	54,000
	September 30	October 15, 2012	2,876		49,000
	June 30	July 13, 2012	3,108		46,000
	March 31	April 13, 2012	3,776		50,000
	Total 2012		12,611		$	199,000
Series A Preferred Stock	'
Stockholders' Equity	'
Schedule of dividends that have been declared by board of directors	'


	Amount Declared During Quarter Ended 2013	Declaration Date	Per Share			Date Paid
	September 30	August 2, 2013	$	0.5625		September 30, 2013
	June 30	May 6, 2013	0.5625			July 1, 2013
	March 31	March 1, 2013	0.5625			April 1, 2013
	Total 2013		$	1.6875

	Amount Declared During Quarter Ended 2012	Declaration Date	Per Share			Date Paid
	December 31	November 2, 2012	$	0.5625		December 31, 2012
	September 30	August 2, 2012	0.5625			October 1, 2012
	June 30	May 15, 2012	0.5625			July 2, 2012
	March 31	March 6, 2012	0.5625			April 2, 2012
	Total 2012		$	2.25
Series B Preferred Stock	'
Stockholders' Equity	'
Schedule of dividends that have been declared by board of directors	'


	Amount Declared During Quarter Ended 2013	Declaration Date	Per Share			Date Paid
	September 30	August 2, 2013	$	0.4140625		September 30, 2013
	June 30 (prorated for April 16, 2013 to June 30, 2013)	May 6, 2013	0.34505			July 1, 2013
	Total 2013		$	0.7591125
Common Shares	'
Stockholders' Equity	'
Schedule of dividends that have been declared by board of directors	'


	Amount Declared During Quarter Ended 2013	Declaration Date	Per Share			Date Paid
	September 30	August 2, 2013	$	0.3		October 15, 2013
	June 30	May 6, 2013	0.3			July 15, 2013
	March 31	March 1, 2013	0.3			April 15, 2013
	Total 2013		$	0.9

	Amount Declared During Quarter Ended 2012	Declaration Date	Per Share			Date Paid
	December 31	November 2, 2012	$	0.27		January 15, 2013
	September 30	August 2, 2012	0.27			October 15, 2012
	June 30	May 15, 2012	0.27			July 13, 2012
	March 31	March 6, 2012	0.26			April 13, 2012
	Total 2012		$	1.07

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2013
Earnings Per Share	'
Schedule of computation of basic and diluted earnings per common share	'
	The following tables set forth the computation of basic and diluted earnings per common share for the three and nine months ended September 30, 2013, and September 30, 2012, respectively (in thousands, except share data).

			Three months ended
			September 30, 2013
	Numerator
	Net income from continuing operations		$	294
	Less: preferred stock dividends		2,712
	Less: amount allocable to unvested restricted stockholders		64
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(335		)
	Loss from continuing operations available to common stockholders		$	(2,147	)
	Income attributable to discontinued operations		$	—
	Less: noncontrolling interest allocable to discontinued operations		—
	Income from discontinued operations attributable to common stockholders		$	—
	Denominator
	Weighted average common shares outstanding—basic and diluted		42,753,722
	Loss from continuing operations attributable to common stockholders		$	(0.05	)
	Income from discontinued operations attributable to common stockholders		—
	Loss per share—basic and diluted		$	(0.05	)

			Nine months ended
			September 30, 2013
	Numerator
	Net loss from continuing operations		$	(874	)
	Less: preferred stock dividends		6,783
	Less: amount allocable to unvested restricted stockholders		197
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(1,034		)
	Loss from continuing operations available to common stockholders		$	(6,820	)
	Income attributable to discontinued operations		$	566
	Less: noncontrolling interest allocable to discontinued operations		76
	Income from discontinued operations attributable to common stockholders		$	490
	Denominator
	Weighted average common shares outstanding—basic and diluted		41,766,740
	Loss from continuing operations attributable to common stockholders		$	(0.16	)
	Income from discontinued operations attributable to common stockholders		0.01
	Loss per share—basic and diluted		$	(0.15	)

			Three months ended
			September 30, 2012
	Numerator
	Net loss from continuing operations		$	(1,304	)
	Less: preferred stock dividends		1,553
	Less: Amount allocable to unvested restricted stockholders		41
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(551		)
	Loss from continuing operations available to common stockholders		$	(2,347	)
	Income attributable to discontinued operations		$	(3,612	)
	Less: noncontrolling interest allocable to discontinued operations		(697		)
	Income from discontinued operations available to common stockholders		$	(2,915	)
	Denominator
	Weighted average common shares outstanding—basic and diluted		29,752,057
	Loss from continuing operations attributable to common stockholders		$	(0.08	)
	Discontinued operations		(0.10		)
	Loss per common share—basic and diluted		$	(0.18	)

			Nine months ended
			September 30, 2012
	Numerator
	Net loss from continuing operations		$	(4,647	)
	Less: preferred stock dividends		4,659
	Less: Amount allocable to unvested restricted stockholders		81
	Less: noncontrolling interest after preferred stock dividends allocable to continuing operations		(2,422		)
	Loss from continuing operations available to common stockholders		$	(6,965	)
	Income attributable to discontinued operations		$	(3,158	)
	Less: noncontrolling interest allocable to discontinued operations		(822		)
Income from discontinued operations available to common stockholders		$	(2,336	)
Denominator
Weighted average common shares outstanding—basic and diluted		21,716,590
Loss from continuing operations attributable to common stockholders		$	(0.32	)
Discontinued operations		(0.11		)
Loss per common share—basic and diluted		$	(0.43	)

Subsequent_Events_Tables

Subsequent Events (Tables)	9 Months Ended
Subsequent Events (Tables)	Sep. 30, 2013
Subsequent Events	'
Schedule of comparison of the original terms to the amended terms of the Bank of America Unsecured Credit Facility and the Bank of America Unsecured Term Loan	'

		Original Terms
		Unsecured Credit Facility and	Amended Terms
	Applicable Rates	Unsecured Term Loan	Unsecured Credit Facility	Unsecured Term Loan
	Eurodollar Rate (1):	one month-LIBOR + 165.0 bps - 225.0 bps	one month-LIBOR + 145.0 bps - 205.0 bps	one month-LIBOR + 140.0 bps - 200.0 bps
	Base Rate (1):	Base rate + 65.0 bps - 125.0 bps	Base rate + 45.0 bps - 105.0 bps	Base rate + 40.0 bps - 100.0 bps
	Unused Fees:	<50%, 35.0 bps; > 50%, 25 bps	<50%, 25.0 bps; > 50%, 20 bps	—

	(1) The spread over the applicable rate is based on the Company’s consolidated leverage ratio.

Organization_and_Description_o1

Organization and Description of Business (Details)	9 Months Ended	12 Months Ended
Organization and Description of Business (Details)	Sep. 30, 2013	Dec. 31, 2012
Organization and Description of Business	'	'
Number of buildings owned	200	'
Number of states in which the entity owned buildings	34	'
Area of building (in square feet)	35,300,000	'
Number of warehouse/distribution buildings	136	'
Number of light manufacturing buildings	44	'
Number of flex/office buildings	20	'
Number of vacant land parcels owned	1	'
Percentage of buildings leased to tenants	94.00%	'
Number of tenants to whom buildings are given on lease	180	'
STAG Industrial Operating Partnership, L.P.	'	'
Organization and Description of Business	'	'
Ownership interest in Operating Partnership (as a percent)	86.46%	85.29%

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Supplemental cash flow information	'	'	'
Cash paid for interest	$14,096	$11,132	'
Supplemental schedule of non-cash investing and financing activities	'	'	'
Non cash investing activities included in additions of land and building improvements	-11,984	-377	'
Issuance of common units for acquisitions	11,499	'	'
Dividends and distributions declared but not paid	$15,285	$12,722	$11,301

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Tenant Accounts Receivable, net	'	'	'	'	'
Allowance for doubtful accounts	$4,000	'	$4,000	'	$0
Accrued rental revenue	8,500,000	'	8,500,000	'	6,400,000
Allowance on accrued rental revenue	0	'	0	'	0
Lease security deposits available in existing letters of credit	4,900,000	'	4,900,000	'	4,800,000
Lease security deposits available in cash	2,800,000	'	2,800,000	'	2,000,000
Deferred Costs	'	'	'	'	'
Amortization of deferred financing fees	300,000	300,000	900,000	900,000	'
Revenue Recognition	'	'	'	'	'
Estimated amount of real estate taxes, which are the responsibility of tenants	$2,400,000	$1,900,000	$7,000,000	$4,900,000	'

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Details 3) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes	'	'	'	'
State and local income, excise and franchise taxes	$0.10	$0.10	$0.30	$0.10
Liabilities for uncertain tax positions	$0	'	$0	'

Real_Estate_Details

Real Estate (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 19, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
	property	sqft		property		property
				sqft		sqft
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	5,955,086	'	5,955,086	'	12,829,194
Number of buildings acquired	'	'	'	29	'	70
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Land	'	$22,824,000	'	$22,824,000	'	$34,991,000
Buildings	'	160,057,000	'	160,057,000	'	269,616,000
Tenant improvements	'	1,768,000	'	1,768,000	'	10,624,000
Cash escrow for capital additions	'	'	'	'	'	785,000
Building and land Improvements	'	5,470,000	'	5,470,000	'	7,488,000
Net assets acquired	'	246,958,000	'	246,958,000	'	423,908,000
Number of buildings purchased through issuance of common stock	8	'	'	'	'	'
Number of common units issued as a consideration for purchase of building	555,758	'	'	'	'	'
Fair value of common units issued	11,500,000	'	'	'	'	'
Purchase price paid in cash	40,100,000	'	'	'	'	'
Building acquisition costs	'	986,000	1,067,000	2,831,000	2,509,000	'
Pro forma information	'	'	'	'	'	'
Total revenue	'	'	'	108,090,000	88,597,000	'
Net income (loss)	'	'	'	5,468,000	-6,961,000	'
Net loss attributable to common stockholders	'	'	'	-1,334,000	-8,677,000	'
Weighted average shares outstanding	'	'	'	41,766,740	21,716,590	'
Net loss per share attributable to common stockholders (in dollars per share)	'	'	'	($0.03)	($0.40)	'
Orangeburg, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	319,000	'	319,000	'	'
Number of buildings acquired	'	'	'	1	'	'
Golden, CO	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	227,500	'	227,500	'	'
Number of buildings acquired	'	'	'	1	'	'
Columbia, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	273,280	'	273,280	'	'
Number of buildings acquired	'	'	'	1	'	'
DeKalb, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	146,740	'	146,740	'	'
Number of buildings acquired	'	'	'	1	'	'
Ocala, FL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	619,466	'	619,466	'	'
Number of buildings acquired	'	'	'	1	'	'
Londonderry, NH	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	125,060	'	125,060	'	'
Number of buildings acquired	'	'	'	1	'	'
Marion, IA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	95,500	'	95,500	'	'
Number of buildings acquired	'	'	'	1	'	'
Mishawaka, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	308,884	'	308,884	'	'
Number of buildings acquired	'	'	'	1	'	'
Southfield, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	113,000	'	113,000	'	'
Number of buildings acquired	'	'	'	1	'	'
Area of land owned adjacent to building	'	5.4	'	5.4	'	'
Houston, TX	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	201,574	'	201,574	'	'
Number of buildings acquired	'	'	'	1	'	'
Idaho Falls, ID	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	90,300	'	90,300	'	'
Number of buildings acquired	'	'	'	1	'	'
Mt. Prospect, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	87,380	'	87,380	'	'
Number of buildings acquired	'	'	'	1	'	'
Williamsport, PA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	250,000	'	250,000	'	'
Number of buildings acquired	'	'	'	1	'	'
Belvidere, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	1,006,960	'	1,006,960	'	'
Number of buildings acquired	'	'	'	8	'	'
Kentwood, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	85,157	'	85,157	'	'
Number of buildings acquired	'	'	'	1	'	'
Marshall, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	57,025	'	57,025	'	'
Number of buildings acquired	'	'	'	1	'	'
Nashville, TN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	150,000	'	150,000	'	'
Number of buildings acquired	'	'	'	1	'	'
Catoosa, OK	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	100,100	'	100,100	'	'
Number of buildings acquired	'	'	'	1	'	'
New Berlin, WI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	205,063	'	205,063	'	'
Number of buildings acquired	'	'	'	1	'	'
Hampstead, MD	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	1,035,249	'	1,035,249	'	'
Number of buildings acquired	'	'	'	1	'	'
New Hope, MN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	107,348	'	107,348	'	'
Number of buildings acquired	'	'	'	1	'	'
Springfield, OH	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	350,500	'	350,500	'	'
Number of buildings acquired	'	'	'	1	'	'
East Windsor, CT	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	145,000
Number of buildings acquired	'	'	'	'	'	1
South Bend, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	225,000
Number of buildings acquired	'	'	'	'	'	1
Lansing, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	129,325
Number of buildings acquired	'	'	'	'	'	1
Portland, ME	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	100,600
Number of buildings acquired	'	'	'	'	'	1
Portland, TN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	414,043
Number of buildings acquired	'	'	'	'	'	1
Spartanburg, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	409,600
Number of buildings acquired	'	'	'	'	'	4
Franklin, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	703,496
Number of buildings acquired	'	'	'	'	'	1
Muhlenberg Township, PA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	394,289
Number of buildings acquired	'	'	'	'	'	1
Avon, CT	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	78,400
Number of buildings acquired	'	'	'	'	'	1
Orlando, FL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	155,000
Number of buildings acquired	'	'	'	'	'	1
Pineville, NC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	75,400
Number of buildings acquired	'	'	'	'	'	1
Buffalo, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	117,000
Number of buildings acquired	'	'	'	'	'	1
Edgefield, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	126,190
Number of buildings acquired	'	'	'	'	'	1
Arlington, TX	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	196,000
Number of buildings acquired	'	'	'	'	'	1
Bellevue, OH	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	181,838
Number of buildings acquired	'	'	'	'	'	1
Atlanta, GA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	407,981
Number of buildings acquired	'	'	'	'	'	1
Huntersville, NC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	185,570
Number of buildings acquired	'	'	'	'	'	1
Simpsonville 1, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	204,952
Number of buildings acquired	'	'	'	'	'	1
Simpsonville 2, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	207,042
Number of buildings acquired	'	'	'	'	'	1
Dallas, GA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	92,807
Number of buildings acquired	'	'	'	'	'	1
Mebane 1, NC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	223,340
Number of buildings acquired	'	'	'	'	'	1
Mebane 2, NC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	202,691
Number of buildings acquired	'	'	'	'	'	1
De Pere, WI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	200,000
Number of buildings acquired	'	'	'	'	'	1
Duncan 1, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	474,000
Number of buildings acquired	'	'	'	'	'	1
Duncan 2, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	313,380
Number of buildings acquired	'	'	'	'	'	1
Buena Vista, VA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	172,759
Number of buildings acquired	'	'	'	'	'	1
Gurnee, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	223,760
Number of buildings acquired	'	'	'	'	'	1
Auburn Hills, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	87,932
Number of buildings acquired	'	'	'	'	'	1
El Paso, TX	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	269,245
Number of buildings acquired	'	'	'	'	'	1
Gloversville 1, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	50,000
Number of buildings acquired	'	'	'	'	'	1
Gloversville 2, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	101,589
Number of buildings acquired	'	'	'	'	'	1
Gloversville 3, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	26,529
Number of buildings acquired	'	'	'	'	'	1
Gloversville 4, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	59,965
Number of buildings acquired	'	'	'	'	'	1
Greenwood 1, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	104,955
Number of buildings acquired	'	'	'	'	'	1
Greenwood 2, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	70,100
Number of buildings acquired	'	'	'	'	'	1
Holland 3, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	195,000
Number of buildings acquired	'	'	'	'	'	1
Independence, VA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	120,000
Number of buildings acquired	'	'	'	'	'	1
Jackson, TN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	250,000
Number of buildings acquired	'	'	'	'	'	1
Johnstown 1, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	52,500
Number of buildings acquired	'	'	'	'	'	1
Johnstown 2, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	60,000
Number of buildings acquired	'	'	'	'	'	1
Johnstown 3, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	42,325
Number of buildings acquired	'	'	'	'	'	1
Johnstown 4, NY	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	57,102
Number of buildings acquired	'	'	'	'	'	1
Kansas City, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	56,580
Number of buildings acquired	'	'	'	'	'	1
Lafayette 1, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	71,400
Number of buildings acquired	'	'	'	'	'	1
Lafayette 2, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	120,000
Number of buildings acquired	'	'	'	'	'	1
Lafayette 3, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	275,000
Number of buildings acquired	'	'	'	'	'	1
Lansing 3, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	250,100
Number of buildings acquired	'	'	'	'	'	1
Marion, OH	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	249,600
Number of buildings acquired	'	'	'	'	'	1
Novi, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	120,800
Number of buildings acquired	'	'	'	'	'	1
O'Hara, PA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	887,084
Number of buildings acquired	'	'	'	'	'	1
Parsons, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	120,000
Number of buildings acquired	'	'	'	'	'	1
Phenix City, AL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	117,568
Number of buildings acquired	'	'	'	'	'	1
Portage, IN	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	212,000
Number of buildings acquired	'	'	'	'	'	1
Ware Shoals, SC	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	20,514
Number of buildings acquired	'	'	'	'	'	1
Wichita 1, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	80,850
Number of buildings acquired	'	'	'	'	'	1
Wichita 2, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	120,000
Number of buildings acquired	'	'	'	'	'	1
Wichita 3, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	44,760
Number of buildings acquired	'	'	'	'	'	1
Wichita 4, KS	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	47,700
Number of buildings acquired	'	'	'	'	'	1
Chicopee, MA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	217,000
Number of buildings acquired	'	'	'	'	'	1
Sterling Heights, MI	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	108,000
Number of buildings acquired	'	'	'	'	'	1
Harrisonburg, VA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	357,673
Number of buildings acquired	'	'	'	'	'	1
Toledo, OH	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	177,500
Number of buildings acquired	'	'	'	'	'	1
Woodstock, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	129,803
Number of buildings acquired	'	'	'	'	'	1
Kansas City 2, MO	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	226,576
Number of buildings acquired	'	'	'	'	'	1
Smyrna, GA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	102,000
Number of buildings acquired	'	'	'	'	'	1
Montgomery, IL	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	584,301
Number of buildings acquired	'	'	'	'	'	1
Statham, GA	'	'	'	'	'	'
Formation transactions	'	'	'	'	'	'
Area (in square feet)	'	'	'	'	'	225,680
Number of buildings acquired	'	'	'	'	'	1
Above market leases	'	'	'	'	'	'
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Amortizable intangible assets	'	5,915,000	'	5,915,000	'	16,728,000
Weighted Average Amortization Period of Lease Intangibles	'	'	'	'5 years 8 months 12 days	'	'10 years
Below market leases	'	'	'	'	'	'
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Amortizable intangible assets	'	-1,976,000	'	-1,976,000	'	-5,962,000
Weighted Average Amortization Period of Lease Intangibles	'	'	'	'7 years 2 months 12 days	'	'6 years 6 months
In-place leases	'	'	'	'	'	'
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Amortizable intangible assets	'	35,654,000	'	35,654,000	'	63,397,000
Weighted Average Amortization Period of Lease Intangibles	'	'	'	'5 years 8 months 12 days	'	'6 years 7 months 6 days
Tenant relationships	'	'	'	'	'	'
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Amortizable intangible assets	'	15,246,000	'	15,246,000	'	26,241,000
Weighted Average Amortization Period of Lease Intangibles	'	'	'	'8 years 4 months 24 days	'	'8 years 2 months 12 days
Series of individually insignificant properties	'	'	'	'	'	'
Allocation of the consideration paid for the acquired assets and liabilities	'	'	'	'	'	'
Number of buildings acquired whose results of operations are included in the consolidated statement of operations	'	29	'	29	'	'
Total revenue	'	5,700,000	'	9,000,000	'	'
Net loss	'	400,000	'	800,000	'	'
Building acquisition costs	'	$900,000	'	$2,500,000	$2,000,000	'

Real_Estate_Details_2

Real Estate (Details 2) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Nov. 30, 2012

Sep. 30, 2012

Jun. 12, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

sqft

Great Bend, KS

In-place lease intangibles

Pittsburgh, PA

Great Bend, KS

sqft

Disposal of real estate properties

Net rentable square feet

190,000

53,183

Carrying value of property sold

$942,376,000

$770,052,000

$4,400,000

Sales price

5,100,000

Net proceeds from sales of discontinued operations

4,843,000

3,216,000

4,800,000

Gain on sales of real estate

464,000

219,000

500,000

Amount contributed to total revenue by the property sold

34,883,000

21,102,000

97,163,000

57,846,000

100,000

200,000

400,000

Loss on impairment

3,900,000

700,000

Purchase price under purchase and sale agreement to sell the building

$4,000,000

Deferred_Leasing_Intangibles_D

Deferred Leasing Intangibles (Details) (USD $)

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

sqft

Level 3 inputs

In-place leases

Above market leases

Tenant relationships

Leasing commissions

Below market leases

In-place leases, lease commissions and tenant relationships

Above and below market leases

Deferred leasing intangibles, assets

Gross

$132,648,000

$108,363,000

$56,079,000

$50,699,000

$73,728,000

$61,050,000

$30,437,000

$23,376,000

Less: Accumulated amortization

-43,728,000

-28,289,000

-15,666,000

-10,362,000

-16,858,000

-11,298,000

-8,543,000

-5,984,000

Net

208,097,000

187,555,000

88,920,000

80,074,000

40,413,000

40,337,000

56,870,000

49,752,000

21,894,000

17,392,000

Deferred leasing intangibles, liabilities

Gross

11,091,000

9,878,000

Less: Accumulated amortization

-4,220,000

-3,007,000

Net

6,871,000

Amortization expense

10,200,000

5,800,000

29,300,000

15,900,000

Net decrease to rental revenues related to net amortization of above (below) market leases

1,500,000

1,200,000

4,400,000

3,500,000

Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships

Remainder of 2013

10,366,000

2014

37,284,000

2015

30,004,000

2016

25,078,000

2017

19,024,000

Net Decrease to Rental Income Related to Above and Below Market Leases

Remainder of 2013

1,505,000

2014

5,734,000

2015

5,928,000

2016

5,610,000

2017

4,098,000

Net rentable area before exercise of option by tenant to downsize the space (in square feet)

190,000

Net rentable area after exercise of option by tenant to downsize the space (in square feet)

60,000

Discount rate at which cash flows are discounted (as a percent)

11.40%

Fair value of lease intangibles

400,000

Non-cash impairment loss

$622,000

$600,000

Debt_Details

Debt (Details) (USD $)

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Oct. 14, 2011

Sep. 30, 2013

Dec. 31, 2012

Aug. 04, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Jul. 28, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

29-May-12

Sep. 30, 2013

Dec. 31, 2012

31-May-12

Sep. 30, 2013

Dec. 31, 2012

Sep. 10, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Nov. 08, 2012

Sep. 30, 2013

Minimum

Maximum

Mortgage notes payable

Sun Life

Webster Bank, maturity date Aug 4, 2016

Bank of America Unsecured Credit Facility, due on September 10, 2016

Union Fidelity

Webster Bank, maturity date May 29, 2017

Webster Bank, maturity date May 31, 2017

Bank of America Unsecured Term Loan, due on September 10, 2017

CIGNA-1 Facility

CIGNA-2 Facility

CIGNA-3 Facility

Wells Fargo, Unsecured Term Loan, due on February 14, 2020

Wells Fargo, CMBS Loan

Unsecured Credit Facility

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

item

Minimum

Maximum

Debt instruments

Interest rate base

'One-month LIBOR

'LIBOR

Interest rate margin (as a percent)

1.65%

2.25%

1.65%

2.25%

2.15%

2.70%

Interest Rate (as a percent)

6.05%

4.22%

5.81%

3.66%

3.64%

6.50%

5.75%

5.88%

4.31%

One-month LIBOR rate (as a percent)

0.18%

0.21%

Principal outstanding

$496,686,000

$479,215,000

$226,686,000

$229,915,000

$3,884,000

$4,079,000

$5,872,000

$5,984,000

$20,000,000

$99,300,000

$6,639,000

$6,898,000

$3,141,000

$3,203,000

$3,250,000

$3,383,000

$3,450,000

$3,500,000

$150,000,000

$59,071,000

$59,645,000

$60,213,000

$60,863,000

$16,935,000

$17,097,000

$100,000,000

$67,548,000

$68,696,000

$68,800,000

New or additional borrowings

4,100,000

6,200,000

7,200,000

Unamortized fair market value premium

200,000

100,000

200,000

Portion of unsecured term loan swapped from LIBOR for fixed rate

100,000,000

125,000,000

Unused commitment fee (as a percent)

0.35%

Unused fees

200,000

40,000

500,000

40,000

100,000

200,000

Unsecured Term Loan

150,000,000

Borrowing capacity after accordion

250,000,000

Variable rate received under agreement

'One-month LIBOR

Consolidated leverage ratio

0.6

Secured leverage ratio

0.45

Unencumbered leverage ratio

0.6

Secured recourse debt ratio

7.5

Fixed charge ratio

1.5

Discount rate at which cash flows are discounted (as a percent)

11.40%

1.58%

1.86%

5.24%

4.64%

Fair value

230,364,000

242,175,000

20,117,000

99,300,000

150,444,000

150,000,000

96,951,000

Number of buildings owned by Company's serving as collateral

Remaining borrowing capacity

2,900,000

47,900,000

50,000,000

Maximum borrowing capacity

$180,000,000

Use_of_Derivative_Financial_In2

Use of Derivative Financial Instruments (Details) (USD $)

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Aug. 01, 2013

Jul. 02, 2013

Mar. 01, 2013

Sep. 30, 2013

Jun. 13, 2013

Sep. 30, 2013

Mar. 01, 2013

Sep. 30, 2013

Mar. 01, 2013

Jun. 13, 2013

Sep. 30, 2013

Jun. 13, 2013

Sep. 30, 2013

Jun. 13, 2013

Sep. 30, 2013

Bank of America Unsecured Term Loan

Wells Fargo Unsecured Term Loan

Minimum

Maximum

Interest Rate Swaps

Interest rate swap one

Interest rate swap two

Interest rate swap three

Interest rate swap four

Interest rate swap five

Interest rate swap six

Interest rate swap seven

Interest rate swap eight

Interest rate swap nine

Interest rate swap ten

Interest rate swap eleven

Bank of America Unsecured Term Loan

Wells Fargo Unsecured Term Loan

Bank of America Unsecured Term Loan

Wells Fargo Unsecured Term Loan

Bank of America Unsecured Term Loan

Wells Fargo Unsecured Term Loan

Minimum

Maximum

Wells Fargo Unsecured Term Loan

Minimum

Maximum

Wells Fargo Unsecured Term Loan

Minimum

Maximum

Wells Fargo Unsecured Term Loan

Minimum

Maximum

item

Wells Fargo Unsecured Term Loan

Risk Management Objective of Using Derivatives

Number of additional interest rate swaps

Portion of Unsecured Term Loan swapped from LIBOR for fixed rate

$100,000,000

$125,000,000

$25,000,000

$50,000,000

Variable rate received under agreement

'One-month LIBOR

Interest rate margin (as a percent)

1.65%

2.15%

1.65%

2.15%

2.25%

2.70%

2.15%

2.70%

2.15%

2.70%

2.15%

2.70%

2.15%

2.70%

Derivative, Fixed Interest Rate

1.70%

1.68%

1.33%

0.79%

0.80%

0.75%

0.73%

1.33%

1.70%

1.68%

1.99%

Spread over fixed rate (as a percent)

2.15%

2.70%

2.15%

2.70%

2.15%

2.70%

2.15%

2.70%

Unsecured Term Loan Swaps

Notional Amount

$25,000,000

$50,000,000

$25,000,000

$10,000,000

$25,000,000

$50,000,000

$25,000,000

Fixed Interest Rate (as a percent)

1.70%

1.68%

1.33%

0.79%

0.80%

0.75%

0.73%

1.33%

1.70%

1.68%

1.99%

Variable Interest Rate

'One-month LIBOR

Use_of_Derivative_Financial_In3

Use of Derivative Financial Instruments (Details 2) (Interest Rate Swaps, Not Designated As Hedging Instruments, USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Interest Rate Swaps \| Not Designated As Hedging Instruments	'	'
Fair value of the interest rate swaps outstanding	'	'
Fair value assets	$2,282	($480)
Fair value liabilities	-131	'
Notional amount assets	200,000	100,000
Notional amount liabilities	$25,000	'

Use_of_Derivative_Financial_In4

Use of Derivative Financial Instruments (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	item	Sep. 30, 2012	item	Sep. 30, 2012
Cash Flow Hedges of Interest Rate Risk	'	'	'	'
Additional amount reclassified from accumulated other comprehensive income (loss) as a decrease to interest expense over the next twelve months	$2,200,000	'	$2,200,000	'
Amount of income (loss) recognized in accumulated other comprehensive income (loss) on interest rate swaps (effective portion)	-1,510,000	-577,000	1,776,000	-577,000
Amount of loss reclassified from accumulated other comprehensive income (loss) into income (loss) as interest expense (effective portion)	476,000	'	856,000	'
Credit-risk-related Contingent Features	'	'	'	'
Number of interest rate swaps in asset position	10	'	10	'
Total number of interest rate swaps	11	'	11	'
Fair values of the interest rate swaps in a net asset position	2,500,000	'	2,500,000	'
Number of interest rate swaps in liability position	1	'	1	'
Fair values of the interest rate swaps in a net liability position	100,000	'	100,000	'
Value of adjustment for nonperformance risk	400,000	'	400,000	'
Termination value required to settle obligations under agreements	$50,000	'	$50,000	'

Use_of_Derivative_Financial_In5

Use of Derivative Financial Instruments (Details 4) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets (liabilities):	'	'
Interest rate Swaps Assets	$2,282	'
Interest rate Swaps Liabilities	-131	-480
Fair value on recurring basis \| Total	'	'
Assets (liabilities):	'	'
Interest rate Swaps Assets	2,282	'
Interest rate Swaps Liabilities	-131	-480
Fair value on recurring basis \| Significant Other Observable Inputs (Level 2)	'	'
Assets (liabilities):	'	'
Interest rate Swaps Assets	2,282	'
Interest rate Swaps Liabilities	($131)	($480)

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)

9 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Nov. 30, 2011

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Nov. 02, 2011

Apr. 16, 2013

Jun. 30, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Oct. 15, 2013

Jul. 15, 2013

Apr. 15, 2013

Jan. 22, 2013

Jan. 15, 2013

Oct. 15, 2012

Jul. 13, 2012

Apr. 13, 2012

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Series A Preferred Stock

Series B Preferred Stock

Common Shares

At The Market (ATM) Program

Stockholders' Equity

Authorized shares of preferred stock

10,000,000

Preferred stock, par value (in dollars per share)

$0.01

Number of shares sold

2,760,000

2,800,000

6,284,152

1,813,970

1,963,170

Shares issued pursuant to full exercise of the underwriters' overallotment option

360,000

300,000

Net proceeds from sale of shares

$70,000,000

$67,800,000

Gross proceeds from sale of shares

70,000,000

Underwriting discount incurred reflected as a reduction to additional paid-in capital

2,200,000

4,900,000

Direct offering costs

8,457,000

10,863,000

200,000

Net proceeds from sale of common stock

154,669,000

237,568,000

110,100,000

36,400,000

39,100,000

Gross proceeds from sale of common stock

115,000,000

36,900,000

39,700,000

Indirect offering costs

27,000

68,000

Direct offering costs

600,000

Aggregate value of common stock available to be sold under the ATM

30,000,000

Number of shares issued pursuant to the full exercise of underwriters' overallotment option

819,672

Dividend rate (as a percent)

9.00%

6.63%

Issue price (in dollars per share)

$25

$18.30

Dividend declared (in dollars per share)

$0.56

$1.69

$2.25

Dividend declared (in dollars per share)

$0.35

$0.41

$0.76

$0.30

$0.27

$0.26

$0.90

$1.07

Issuance of shares to directors for their services

2,607

2,602

2,418

2,851

2,876

3,108

3,776

7,627

12,611

Fair value of shares issued to directors for their services

$53,000

$52,000

$54,000

$49,000

$46,000

$50,000

$158,000

$199,000

Stockholders_Equity_Details_2

Stockholders' Equity (Details 2) (USD $)	0 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	6-May-13	Jan. 03, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restricted Stock-Based Compensation	'	'	'	'	'	'	'
Number of days of average trailing stock price used to calculate number of shares of common stock granted	'	'	'	'	'10 days	'	'
2011 Plan \| Restricted stock	'	'	'	'	'	'	'
Restricted Stock-Based Compensation	'	'	'	'	'	'	'
Number of shares granted	'	106,268	'	'	'	'	'
Fair value of shares granted	'	$1.90	'	'	'	'	'
Fair value of shares granted (in dollars per share)	'	$18.11	'	'	'	'	'
Non-cash compensation expense recognized	'	'	0.2	0.1	0.6	0.3	'
Unrecognized compensation expense for remaining life of the awards	'	'	2.7	'	2.7	'	1.5
Number of shares vested	'	'	'	'	48,173	'	16,161
Fair value of shares vested	'	'	'	'	$0.90	'	$0.20
Shares forfeited	'	'	'	'	11,540	'	1,559
Additional shares of common stock awarded under the plan	1,887,274	'	'	'	'	'	'
Maximum number of common stock that can be awarded	3,642,461	'	'	'	'	'	'
Additional shares of common stock awarded under the plan as a percentage of common stock issued and outstanding	7.50%	'	'	'	'	'	'

Noncontrolling_Interest_Detail

Noncontrolling Interest (Details)	0 Months Ended	9 Months Ended			0 Months Ended	9 Months Ended				9 Months Ended
	Jun. 19, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Jun. 19, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013
	property		Operating Partnership	Operating Partnership	Noncontrolling Common Units	Noncontrolling Common Units	Noncontrolling Common Units	LTIP Units	LTIP Units	LTIP Units
					property	Operating Partnership	Operating Partnership	Operating Partnership	Operating Partnership	Operating Partnership
										2011 Plan
Noncontrolling interest	'	'	'	'	'	'	'	'	'	'
Units held by noncontrolling interests (in shares)	'	'	'	'	'	6,299,186	5,743,958	599,464	413,551	'
Ownership interest held by noncontrolling owners (as a percent)	'	'	13.54%	14.71%	'	'	'	'	'	'
Redemption right of investor to cause the Operating Partnership to redeem its units equivalent to current market value of number of shares of entity's common stock (in shares)	'	'	'	'	'	1	'	'	'	'
Conversion ratio of noncontrolling units	'	'	'	'	'	1	'	'	'	1
Number of common units issued as a consideration for purchase of building	555,758	'	'	'	555,758	'	'	'	'	'
Number of buildings purchased through issuance of common stock	8	'	'	'	8	'	'	'	'	'
Noncontrolling common units converted to common stock (in shares)	'	2,186	'	'	'	'	'	'	'	'

Noncontrolling_Interest_Detail1

Noncontrolling Interest (Details 2) (2011 Plan, LTIP Units, USD $)	3 Months Ended		9 Months Ended		12 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jan. 03, 2013	Jan. 03, 2013
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Non-employee, independent directors	Executive officers
Share-based compensation	'	'	'	'	'	'	'
Units granted (in shares)	'	'	'	'	'	14,525	173,044
Fair value at the date of grant	'	'	$3.30	'	'	'	'
Volatility factor (as a percent)	'	'	45.00%	'	'	'	'
Risk-free interest rate (as a percent)	'	'	1.97%	'	'	'	'
Expected annual dividend yield (as a percent)	'	'	6.00%	'	'	'	'
Term	'	'	'10 years	'	'	'	'
Units redeemed (in shares)	'	'	1,656	'	'	'	'
Units vested (in shares)	'	'	200,741	'	112,506	'	'
Non-cash compensation expense recognized	0.4	0.2	1.2	0.7	'	'	'
Unrecognized compensation expense	$5.60	'	$5.60	'	$3.50	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (Unvested restricted stock)	3 Months Ended		9 Months Ended
Earnings Per Share (Details) (Unvested restricted stock)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unvested restricted stock	'	'	'	'
Antidilutive participating securities	'	'	'	'
Unvested shares of restricted stock on a weighted average basis excluded from computation of earnings per share (in shares)	214,389	150,978	220,466	157,292

Earnings_Per_Share_Details_2

Earnings Per Share (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator	'	'	'	'
Net income (loss) from continuing operations	$294	($1,304)	($874)	($4,647)
Less: preferred stock dividends	2,712	1,553	6,783	4,659
Less: amount allocable to unvested restricted stockholders	64	41	197	81
Less: noncontrolling interest after preferred stock dividends allocable to continuing operations	-335	-551	-1,034	-2,422
Loss from continuing operations available to common stockholders	-2,147	-2,347	-6,820	-6,965
Income attributable to discontinued operations	'	-3,612	566	-3,158
Less: noncontrolling interest allocable to discontinued operations	'	-697	76	-822
Income from discontinued operations attributable to common stockholders	'	($2,915)	$490	($2,336)
Denominator	'	'	'	'
Weighted average common shares outstanding - basic and diluted	42,753,722	29,752,057	41,766,740	21,716,590
Earnings per common share	'	'	'	'
Loss from continuing operations attributable to common stockholders (in dollars per share)	($0.05)	($0.08)	($0.16)	($0.32)
Income from discontinued operations attributable to common stockholders (in dollars per share)	'	($0.10)	$0.01	($0.11)
Loss per share - basic and diluted (in dollars per share)	($0.05)	($0.18)	($0.15)	($0.43)

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (One-time incentive fee, Columbus Nova, USD $)	Sep. 30, 2013	Dec. 31, 2012
One-time incentive fee \| Columbus Nova	'	'
Commitments and Contingencies	'	'
Fair value of incentive fee	$0	$0

Related_Party_Transaction_Deta

Related Party Transaction (Details) (Fund II)	1 Months Ended
Related Party Transaction (Details) (Fund II)	Jun. 30, 2013
Fund II	'
Related party transactions	'
Annual asset management fee based on the equity investment (as a percent)	1.25%

Subsequent_Events_Details

Subsequent Events (Details) (USD $)

9 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

9 Months Ended

0 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 24, 2013

Oct. 07, 2013

Common Shares

Unsecured Credit Facility

Bank of America Unsecured Term Loan

Subsequent event

Minimum

Maximum

Minimum

Maximum

Dividends declared monthly

Dividends declared quarterly

Bank of America Unsecured Credit Facility and Unsecured Term Loan

Unsecured Credit Facility

Bank of America Unsecured Term Loan

Common Shares

Original Terms

Eurodollar Rate

Base Rate

Minimum

Maximum

Amended Terms

LIBOR

Base Rate

Eurodollar Rate

Base Rate

Minimum

Maximum

LIBOR

Base Rate

Eurodollar Rate

Base Rate

Minimum

Maximum

Original Terms

Eurodollar Rate

Base Rate

Eurodollar Rate

Base Rate

Amended Terms

Eurodollar Rate

Base Rate

Eurodollar Rate

Base Rate

Amended Terms

Eurodollar Rate

Base Rate

Eurodollar Rate

Base Rate

Original Terms

Amended Terms

Subsequent Events

Dividends on common stock declared (in dollars per share)

$0.30

$0.27

$0.26

$0.90

$1.07

$0.10

$0.30

Interest rate base

'One-month LIBOR

'LIBOR

'one month-LIBOR

'Base Rate

'one month LIBOR

'Base Rate

'one month-LIBOR

'Base Rate

'LIBOR

'Base Rate

'one month-LIBOR

'Base Rate

Interest rate margin (as a percent)

1.65%

2.25%

1.65%

2.25%

1.65%

0.65%

2.25%

1.25%

1.45%

0.45%

2.05%

1.05%

1.40%

0.40%

2.00%

1.00%

Unused commitment fee when usage less than 50 % (as a percent)

0.35%

0.25%

Unused commitment fee when usage more than or equal to 50 % (as a percent)

0.25%

0.20%