Consolidated and Combined Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Apr. 19, 2011 STAG Predecessor Group
Cash flows from operating activities:
Net loss	$ (5,899)	$ (2,889)	$ (229)
Adjustment to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	6,446	18,132	2,459
Loss on impairment		622
Non-cash portion of interest expense	264	498	31
Intangible amortization in rental income, net	869	2,258	(2)
Straight line adjustment, net	(326)	(1,269)	(16)
Gain on interest rate swaps	(500)	(215)	(762)
Gain on extinguishment of debt		(18)
Gain on sale of real estate		(219)
Stock-based compensation expense	156	976
Issuance of units for acquisition fee		225
Change in assets and liabilities:
Tenant accounts receivable, net	(42)	101	88
Leasing commissions, net	(25)	(359)	(24)
Restricted cash	(171)	(689)
Prepaid expenses and other assets	450	(653)	(87)
Accounts payable, accrued expenses and other liabilities	(429)	(35)	106
Tenant prepaid rent and security deposits	843	1,152	169
Due from related parties	746	(43)	767
Due to related parties	(596)		(141)
Total adjustments	7,685	20,464	2,588
Net cash provided by operating activities	1,786	17,575	2,359
Cash flows from investing activities:
Additions of land and building improvements	(12,349)	(86,992)	(39)
Proceeds from sale of rental property, net		3,216
Restricted cash	(540)	(1,173)	(542)
Cash paid for contributed assets, net	(2,159)
Cash received (paid) for deal deposits, net	(1,065)	35
Additions to lease intangibles	(5,686)	(25,950)
Net cash used in investing activities	(21,799)	(110,864)	(581)
Cash flows from financing activities:
Proceeds from issuance of common stock	205,563	107,387
Offering costs related to issuance of common stock	(17,042)	(5,104)
Redemption of initial capitalization of STAG Industrial, Inc. shares	(2)
Proceeds from notes payable to related parties			789
Repayment of notes payable to related parties	(10,366)
Proceeds from secured corporate credit facility	11,000	87,300
Repayment of secured corporate credit facility	(11,000)	(82,300)
Proceeds from mortgage notes payable	11,400	9,252
Repayment of mortgage notes payable	(152,954)	(18,592)	(1,180)
Termination of swap contracts	(894)
Payment of loan fees and costs	(2,662)	(477)
Dividends and distributions		(14,009)	(2,679)
Restricted cash - escrow for dividends		(1,553)
Net cash provided by (used in) financing activities	33,043	81,904	(3,070)
Increase (decrease) in cash and cash equivalents	13,030	(11,385)	(1,292)
Cash and cash equivalents-beginning of period		16,498	1,567
Cash and cash equivalents-end of period	$ 13,307	$ 5,113	$ 275