Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES
Net income	$ 5,495	$ 14,051
Results from discontinued operations		(792)
Income (loss) from continuing operations	5,495	13,259
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(3,282)	(604)
Depreciation and amortization	29,924	26,089
Amortization of debt issuance costs and debt fair value adjustments	1,979	1,895
Early extinguishment of debt		25,867
Loan transfer and consent fees		9,019
Gain on acquisition of controlling interests		(46,371)
Stock-based compensation expense	1,406	1,190
Loss from real estate joint ventures
Other, net	745	1,116
Changes in operating assets and liabilities
Change in restricted cash	(1,262)	(306)
Change in accounts receivable	1,723	(1,509)
Change in other assets	255	102
Change in accounts payable and accrued expenses	(1,459)	(1,343)
Change in security deposits and other liabilities	(182)	(972)
Net cash provided by operating activities of continuing operations	35,342	27,432
Net cash provided by operating activities of discontinued operations		1,275
Net cash provided by operating activities	35,342	28,707
INVESTING ACTIVITIES
Acquisition of real estate, net of cash acquired	(32,918)	(128,877)
Capital expenditures	(12,101)	(2,456)
Change in restricted cash	(495)	(1,511)
Cash acquired from acquisition of controlling interests in real estate joint ventures		15,223
Leasing commissions	(1,365)	(870)
Purchase of marketable securities		(33,103)
Maturity of marketable securities	3,324	1,710
Deposit on property acquisition		(91,600)
Net cash used in investing activities of continuing operations	(43,555)	(241,484)
Net cash used in investing activities of discontinued operations	0	(208)
Net cash used in investing activities	(43,555)	(241,692)
FINANCING ACTIVITIES
Issuance of secured notes payable	21,900	84,500
Repayment of secured notes payable	(2,315)	(262,003)
Defeasance costs on repayment of secured notes payable		(24,345)
Loan transfer and consent fees paid		(8,350)
Repayment of unsecured notes payable		(38,013)
Repayment of notes payable to affiliates		(19,279)
Debt issuance costs	(924)	(2,961)
Proceeds from issuance of common stock, net		596,541
Proceeds from private placement of common units		5,410
Dividends paid to common stock and unitholders	(24,226)	(21,898)
Deferred offering costs	(361)
Payments to nonaccredited investors		(6,075)
Distributions to Predecessor's controlling and non-controlling interests		(39,960)
Net cash (used in) provided by financing activities	(5,926)	263,567
Net (decrease) increase in cash and cash equivalents	(14,139)	50,582
Cash and cash equivalents, beginning of period	112,723	41,953
Cash and cash equivalents, end of period	$ 98,584	$ 92,535