Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 40,468	$ 24,741
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,844	17,920
Gain from disposal of properties classified as discontinued operations	(18,699)
Equity in (earnings) loss of unconsolidated joint venture	(215)	(31)
Distributions from unconsolidated joint venture	285	225
Lease termination fee related to restricted cash		10,865
Stock-based compensation expense	2	43
Changes in operating assets and liabilities, net of liabilities assumed:
Deferred rent	(103)	414
Other assets	4,110	(1,279)
Interest payable	(82)	(62)
Security deposits	(452)	(252)
Prepaid rent and deferred revenue	(986)	(1,139)
Accounts payable and accrued expenses	(787)	4,842
Net cash provided by operating activities	41,385	56,287
Cash flows from investing activities:
Improvements to real estate assets	(717)	(1,772)
Decrease in restricted cash		6,803
Net proceeds from sale of real estate	61,838
Purchase of real estate	(11,480)	(10,566)
Proceeds received from note receivable	2,952
Net cash provided by (used in) investing activities	52,593	(5,535)
Cash flows from financing activities:
Principal payments on mortgage notes payable	(11,501)	(10,873)
Principal payments on mortgage note payable (related parties)	(467)	(432)
Proceeds from note payable (related parties)	26,337	8,612
Payments on note payable (related parties)	(26,337)	(8,566)
Payments on note payable		(10,776)
Net (repayments) borrowings on revolving line of credit	(3,305)	11,624
Financing costs		(21)
Distributions paid to noncontrolling interests	(40,930)	(34,815)
Dividends paid to common stockholders	(10,870)	(9,164)
Net cash used in financing activities	(67,073)	(54,411)
Net increase (decrease) in cash and cash equivalents	26,905	(3,659)
Cash and cash equivalents, beginning of period		3,988
Cash and cash equivalents, end of period	26,905	329
Supplemental information:
Cash paid for interest	14,601	16,016
Supplemental schedule of non-cash investing and financing activities:
Debt incurred in connection with property acquisitions	11,479
Note receivable received from sale of real estate	18,780
Issuance of common stock upon conversion of O.P. units	$ 821	$ 3,266