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
Rental revenue	$ 127,995	$ 121,661	$ 130,495
Interest income from loans and securities	19,655	27,621	30,668
Tenant reimbursements	13,900	12,159	11,473
Other revenue	793	974	1,532
Total revenues	162,343	162,415	174,168
Interest expense	76,594	83,024	88,195
Property expenses	27,216	24,690	20,410
General and administrative expenses	10,628	10,660	10,881
General and administrative expenses-stock based compensation	2,785	2,541	2,118
Depreciation and amortization expense on real property	47,632	45,956	48,957
Other expenses	199	267	308
Total expenses	165,054	167,138	170,869
Gain (loss) on investments, net	2,074	(7,949)	(10,886)
Provision for loss on property investment	(16,423)		(15,999)
Gain (loss) on extinguishment of debt	15,163	(293)	9,829
Total other gains (losses)	(3,050)	(8,242)	(12,980)
Provision for income taxes			(201)
Loss from continuing operations	(5,761)	(12,965)	(9,882)
Income (loss) from discontinued operations	42	(227)	(60)
Total discontinued operations	3,906	(227)	(4,136)
Net loss before non-controlling interest in consolidated subsidiaries	(1,855)	(13,192)	(14,018)
Non-controlling interest in consolidated subsidiaries	20	52	51
Net loss	(1,835)	(13,140)	(13,967)
Dividends allocable to preferred shares	(6,510)	(5,618)	(2,844)
Net loss allocable to common stockholders	(8,345)	(18,758)	(16,811)
Income (loss) per common share, basic and diluted:
Loss from continuing operations	$ (0.19)	$ (0.33)	$ (0.26)
Income (loss) from discontinued operations	$ 0.06	$ 0.00	$ (0.08)
Net loss per common share, basic and diluted	$ (0.13)	$ (0.33)	$ (0.34)
Weighted average number of common shares outstanding, basic and diluted	64,758	56,189	49,297
Dividends declared per common share	$ 0.26	$ 0.25	$ 0.21
Dividends declared per preferred share	$ 2.03	$ 2.03	$ 2.03
Continuing Operations
Gain (loss) on investments, net	648	(7,949)	(10,886)
Provision for loss on property investment			(11,923)
Gain (loss) on extinguishment of debt	(3,698)	(293)	9,829
Discontinued Operations
Gain (loss) on investments, net	1,426
Provision for loss on property investment	(16,423)		(4,076)
Gain (loss) on extinguishment of debt	$ 18,861