Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income	$ 22,740	$ 7,533
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	13,998	10,611
Amortization of leasing costs and in-place lease intangibles	2,993	1,982
Accrued straight-line rental revenue	(1,724)	(1,730)
Amortization of leasing incentives and above or below-market rents	564	461
Accrued straight-line ground rent expense	224	236
Bad debt expense	123	48
Noncash stock compensation	755	720
Impairment charges	23	15
Noncash interest expense	791	410
Loss on extinguishment of debt	410
Gain on real estate dispositions	(13,407)
Change in the fair value of derivatives	238	123
Changes in operating assets and liabilities, net of acquisitions:
Property assets	(2,524)	(1,932)
Property liabilities	2,369	234
Construction assets	(29,027)	(4,298)
Construction liabilities	19,078	6,879
Net cash provided by operating activities	17,624	21,292
INVESTING ACTIVITIES
Development of real estate investments	(40,293)	(77,094)
Tenant and building improvements	(3,794)	(4,622)
Acquisitions of real estate investments	(64,945)	(2,754)
Dispositions of real estate investments	50,613
Government development grants	300	300
Decrease (increase) in restricted cash	742	(1,713)
Leasing costs	(1,715)	(1,524)
Leasing incentives	(1,563)	(63)
Net cash used for investing activities	(60,655)	(87,470)
FINANCING ACTIVITIES
Proceeds from sales of common stock	7,687	49,566
Offering costs	(321)	(320)
Debt issuances, credit facility and construction loan borrowings	200,267	92,409
Debt and credit facility payments, including principal amortization	(153,321)	(61,494)
Debt issuance costs	(1,844)	(35)
Redemption of operating partnership units	(79)
Dividends and distributions	(20,050)	(15,729)
Net cash provided by financing activities	32,339	64,397
Net decrease in cash and cash equivalents	(10,692)	(1,781)
Cash and cash equivalents, beginning of period	25,883	18,882
Cash and cash equivalents, end of period	$ 15,191	$ 17,101