Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES
Net income	$ 9,780	$ 18,669
Results from discontinued operations	213	(5,100)
INCOME FROM CONTINUING OPERATIONS	9,993	13,569
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(5,521)	(1,639)
Depreciation and amortization	46,356	41,916
Amortization of debt issuance costs and debt fair value adjustments	2,964	2,924
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	2,128	1,902
Other, net	998	1,774
Changes in operating assets and liabilities
Change in restricted cash	(2,100)	(848)
Change in accounts receivable	445	(3,262)
Change in other assets	(1,409)	(590)
Change in accounts payable and accrued expenses	2,848	5,689
Change in security deposits and other liabilities	(1,095)	125
Net cash provided by operating activities of continuing operations	55,607	50,075
Net cash (used in) provided by operating activities of discontinued operations	(213)	1,748
Net cash provided by operating activities	55,394	51,823
INVESTING ACTIVITIES
Acquisition of real estate, net of cash acquired	(253,090)	(227,309)
Capital expenditures	(25,779)	(5,871)
Change in restricted cash	1,066	(1,653)
Cash acquired from acquisition of controlling interests in real estate joint ventures		15,222
Leasing commissions	(2,727)	(1,772)
Purchase of marketable securities		(33,103)
Maturity of marketable securities	4,384	3,502
Deposit on property acquisition	(2,000)
Sale of marketable securities	23,191
Net cash used in investing activities of continuing operations	(254,955)	(250,984)
Net cash provided by investing activities of discontinued operations		30,078
Net cash used in investing activities	(254,955)	(220,906)
FINANCING ACTIVITIES
Issuance of secured notes payable	21,900	84,500
Repayment of secured notes payable	(3,512)	(263,106)
Defeasance costs on repayment of secured notes payable		(24,345)
Proceeds from unsecured line of credit	164,000
Repayment of unsecured line of credit	(23,000)
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	(932)	(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	(36,340)	(34,010)
Deferred offering costs	(361)
Payments to nonaccredited investors		(6,075)
Distributions to Predecessor's controlling and non-controlling interests		(39,960)
Net cash provided by financing activities	121,755	250,352
Net (decrease) increase in cash and cash equivalents	(77,806)	81,269
Cash and cash equivalents, beginning of period	112,723	41,953
Cash and cash equivalents, end of period	$ 34,917	$ 123,222