Discontinued Operations (Details) (USD $) In Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010	Dec. 31, 2010
Discontinued Operations [Abstract]
Rental and other revenues	$ 500		$ 1,227	$ 1,113		$ 2,557
Operating expenses:
Rental property and other expenses	178		455	359		1,048
Depreciation and amortization	32		275	127		549
Total operating expenses	210		730	486		1,597
Other Income	1		1	1		1
Income from discontinued operations	291		498	628		961
Net losses on disposition of discontinued operations	0		(260)	0		(86)
Total discontinued operations	291		238	628		875
Assets:
Land	2,788			2,788			2,788
Buildings and tenant improvements	12,663			12,663			12,707
Land held for development	967			967			2,766
Total real estate assets	16,418			16,418			18,261
Less accumulated depreciation	(5,113)			(5,113)			(5,012)
Net real estate assets	11,305			11,305			13,249
Deferred leasing costs, net	55			55			58
Accrued straight line rents receivable	249			249			257
Prepaid expenses and other assets	0			0			43
Real estate and other assets, net, held for sale	11,609			11,609			13,607
Tenant security deposits, deferred rents and accrued costs	$ 123	[1]		$ 123	[1]		$ 11	[1]

[1] Included in accounts payable, accrued expenses and other liabilities.