Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Rental Income	$ 56,405	$ 53,813	$ 111,511	$ 107,141
Tenant Recoveries and Other Income	17,157	16,587	34,508	34,227
Total Revenues	73,562	70,400	146,019	141,368
Expenses:
Property Expenses	24,203	23,960	48,800	50,035
General and Administrative	5,916	4,747	11,475	10,005
Restructuring Costs		393		1,553
Impairment of Real Estate		(5,335)	7	(6,999)
Depreciation and Other Amortization	26,898	25,310	55,374	49,558
Total Expenses	57,017	49,075	115,656	104,152
Other Income (Expense):
Interest Income	697	908	1,643	1,898
Interest Expense	(19,695)	(24,534)	(40,904)	(50,333)
Amortization of Deferred Financing Costs	(799)	(1,034)	(1,622)	(2,085)
Mark-to-Market (Loss) on Interest Rate Protection Agreements	(429)	(232)	(305)	(188)
Loss from Retirement of Debt	(6,223)	(3,233)	(6,222)	(4,099)
Total Other Income (Expense)	(26,449)	(28,125)	(47,410)	(54,807)
Loss from Continuing Operations Before Equity in Income of Other Real Estate Partnerships, Equity in Income of Joint Ventures, Gain on Change in Control of Interests and Income Tax Provision	(9,904)	(6,800)	(17,047)	(17,591)
Equity in Income of Other Real Estate Partnerships	2,468	2,852	3,566	7,707
Equity in Income of Joint Ventures	37	99	128	135
Gain on Change in Control of Interests		689	776	689
Income Tax Provision	(5,354)	(162)	(5,263)	(86)
Loss from Continuing Operations	(12,753)	(3,322)	(17,840)	(9,146)
Discontinued Operations:
Income Attributable to Discontinued Operations	994	1,229	986	417
Gain on Sale of Real Estate	1,415	3,537	7,614	6,279
Provision for Income Taxes Allocable to Discontinued Operations		(1,532)		(2,039)
Income from Discontinued Operations	2,409	3,234	8,600	4,657
Net Loss	(10,344)	(88)	(9,240)	(4,489)
Preferred Unit Distributions	(4,798)	(4,947)	(9,560)	(9,874)
Net Loss Available to Unitholders and Participating Securities	(15,142)	(5,035)	(18,800)	(14,363)
Basic and Diluted Earnings Per Unit:
Loss from Continuing Operations Available to Unitholders	$ (0.19)	$ (0.10)	$ (0.30)	$ (0.24)
Income from Discontinued Operations Available to Unitholders	$ 0.03	$ 0.04	$ 0.09	$ (0.06)
Net Loss Available to Unitholders and Participating Securities	$ (0.16)	$ (0.06)	$ (0.20)	$ (0.18)
Weighted Average Units Outstanding	93,106	85,029	92,458	80,540
Net Loss Available to Unitholders Attributable to:
General Partners	(14,304)	(4,745)	(17,755)	(13,420)
Limited Partners	(838)	(290)	(1,045)	(943)
Net Loss Available to Unitholders and Participating Securities	$ (15,142)	$ (5,035)	$ (18,800)	$ (14,363)