Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 18,403	$ 4,779
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	8,950	6,796
Amortization of leasing costs and in-place lease intangibles	1,724	1,230
Accrued straight-line rental revenue	(1,349)	(850)
Amortization of leasing incentives and above or below-market rents	394	317
Accrued straight-line ground rent expense	158	159
Bad debt expense	72	11
Noncash stock compensation	582	522
Impairment charges	23
Noncash interest expense	558	293
Loss on extinguishment of debt	407
Gain on real estate dispositions	(13,407)
Change in the fair value of derivatives	187	169
Changes in operating assets and liabilities, net of acquisitions:
Property assets	(2,067)	(1,792)
Property liabilities	810	(1,056)
Construction assets	(20,040)	(206)
Construction liabilities	9,900	(1,375)
Net cash provided by operating activities	5,305	8,997
INVESTING ACTIVITIES
Development of real estate investments	(31,050)	(47,709)
Tenant and building improvements	(2,471)	(3,680)
Acquisitions of real estate investments, net of cash acquired	(35,372)	(2,895)
Dispositions of real estate investments	50,613
Decrease (increase) in restricted cash	1,179	(777)
Leasing costs	(1,508)	(874)
Leasing incentives	(1,563)	(63)
Net cash used for investing activities	(20,172)	(55,998)
FINANCING ACTIVITIES
Proceeds from sales of common stock	3,596
Offering costs	(203)	(243)
Debt issuances, credit facility and construction loan borrowings	173,994	56,687
Debt and credit facility payments, including principal amortization	(146,378)	(1,578)
Debt issuance costs	(1,446)	(35)
Redemption of operating partnership units	(79)
Dividends and distributions	(13,144)	(10,441)
Net cash provided by financing activities	16,340	44,390
Net increase (decrease) in cash and cash equivalents	1,473	(2,611)
Cash and cash equivalents, beginning of period	25,883	18,882
Cash and cash equivalents, end of period	$ 27,356	$ 16,271