Consolidated Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating revenues:
Rental income	$ 20,075	$ 20,354	$ 40,087	$ 42,077
Tenant reimbursements	2,967	4,119	6,914	8,728
Other income	401	409	674	1,410
Total operating revenues	23,443	24,882	47,675	52,215
Operating expenses:
Property operating and maintenance	2,863	2,489	5,272	4,999
Real estate taxes	3,014	2,994	5,442	6,044
General and administrative	911	522	1,562	1,043
Depreciation and amortization	5,993	5,509	11,986	11,000
Total operating expenses	12,781	11,514	24,262	23,086
Operating income	10,662	13,368	23,413	29,129
Other income (expenses):
Equity in earnings of unconsolidated joint venture	60	27	174	18
Interest income	58	57	151	126
Interest expense	(4,833)	(5,246)	(9,755)	(10,525)
Interest expense – related parties	(146)	(144)	(292)	(291)
Income from continuing operations	5,801	8,062	13,691	18,457
Discontinued operations:
Gain from disposal of discontinued operations	7,989		13,508
Loss attributable to discontinued operations	(81)	(692)	(237)	(1,152)
Net income (loss) from discontinued operations	7,908	(692)	13,271	(1,152)
Net income	13,709	7,370	26,962	17,305
Net income attributable to noncontrolling interests	(10,929)	(5,491)	(21,338)	(13,027)
Net income available to common stockholders	$ 2,780	$ 1,879	$ 5,624	$ 4,278
Net income per common share from continuing operations:
Basic (in Dollars per share)	$ 0.06	$ 0.09	$ 0.15	$ 0.20
Diluted (in Dollars per share)	$ 0.06	$ 0.09	$ 0.15	$ 0.20
Net income per common share from discontinued operations:
Basic (in Dollars per share)	$ 0.06	$ (0.01)	$ 0.10	$ (0.01)
Diluted (in Dollars per share)	$ 0.06	$ (0.01)	$ 0.09	$ (0.01)
Net income per common share to common stockholders:
Basic (in Dollars per share)	$ 0.12	$ 0.08	$ 0.25	$ 0.19
Diluted (in Dollars per share)	$ 0.12	$ 0.08	$ 0.24	$ 0.19
Weighted average shares of common stock outstanding (basic) (in Shares)	22,668,020	22,495,605	22,652,844	22,392,427
Weighted average shares of common stock outstanding (diluted) (in Shares)	23,079,739	22,756,006	23,110,364	22,583,358