Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Rental Income	$ 213,536	$ 211,438	$ 214,523
Tenant Recoveries and Other Income	66,158	70,696	75,356
Construction Revenues		869	54,957
Total Revenues	279,694	283,003	344,836
Expenses:
Property Expenses	97,414	97,896	100,743
General and Administrative	20,508	26,492	37,567
Restructuring Costs	1,553	1,858	7,806
Impairment of Real Estate	(8,139)	106,555	5,617
Depreciation and Other Amortization	108,624	111,504	118,191
Construction Expenses		507	52,720
Total Expenses	219,960	344,812	322,644
Other Income (Expense):
Interest Income	3,990	4,426	3,100
Interest Expense	(95,103)	(102,685)	(114,133)
Amortization of Deferred Financing Costs	(3,785)	(3,342)	(3,006)
Mark-to-Market (Loss) Gain on Interest Rate Protection Agreements	(1,718)	(1,107)	3,667
(Loss) Gain From Retirement of Debt	(5,299)	(4,304)	34,562
Foreign Currency Exchange Loss	(332)	(190)
Total Other Income (Expense)	(102,247)	(107,202)	(75,810)
Loss from Continuing Operations Before Equity in Income of Other Real Estate Partnerships, Equity in Income (Loss) of Joint Ventures, Gain on Sale of Joint Venture Interests, Gain on Change in Control of Interests and Income Tax (Provision) Benefit	(42,513)	(169,011)	(53,618)
Equity in Income of Other Real Estate Partnerships	11,891	3,494	18,516
Equity in Income (Loss) of Joint Ventures	980	675	(6,470)
Gain on Sale of Joint Venture Interests		11,226
Gain on Change in Control of Interests	689
Income Tax (Provision) Benefit	(450)	(2,963)	25,185
Loss from Continuing Operations	(29,403)	(156,579)	(16,387)
Discontinued Operations:
Income (Loss) Attributable to Discontinued Operations	1,955	(75,974)	1,376
Gain on Sale of Real Estate	18,814	10,529	21,014
Provision for Income Taxes Allocable to Discontinued Operations	(1,246)		(1,846)
Total Discontinued Operations	19,523	(65,445)	20,544
(Loss) Income Before Gain on Sale of Real Estate	(9,880)	(222,024)	4,157
Gain on Sale of Real Estate	1,370	859	313
Provision for Income Taxes Allocable to Gain on Sale of Real Estate	(452)	(342)	(143)
Net (Loss) Income	(8,962)	(221,507)	4,327
Less: Preferred Unit Distributions	(19,565)	(19,677)	(19,516)
Net Loss Available to Unitholders and Participating Securities	(28,527)	(241,184)	(15,189)
Basic and Diluted Earnings Per Unit:
Loss from Continuing Operations Available to Unitholders	$ (0.56)	$ (2.57)	$ (0.66)
Income (Loss) from Discontinued Operations Available to Unitholders	$ 0.23	$ (0.96)	$ 0.38
Net Loss Available to Unitholders and participating Securities	$ (0.33)	$ (3.53)	$ (0.28)
Distributions Per Unit	$ 0.00	$ 0.00	$ 0.00
Weighted Average Units Outstanding	85,913	68,327	54,261
Net Loss Available to Unitholders Attributable to:
General Partners	(26,782)	(222,386)	(13,642)
Limited Partners	(1,745)	(18,798)	(1,547)
Net Loss Available to Unitholders and Participating Securities	$ (28,527)	$ (241,184)	$ (15,189)