Other Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Assets (Textual) [Abstract]
Accumulated amortization, incentives to lessees	$ 3,696,000	$ 2,991,000
Accumulated depreciation on FF&E and leasehold improvements	17,814,000	16,117,000
Accumulated amortization on loan closing costs	4,026,000	3,109,000
Accumulated amortization of in place leases	2,833,000	2,492,000
Accumulated amortization of finite-lived intangible assets, above market leases	8,845,000	8,741,000
Losses on abandoned predevelopment projects	937,000	829,000	7,723,000
Transfer from predevelopment assets to investment in joint venture related to the EP I, LLC project	6,200,000
Net aggregate amortization related to intangible assets and liabilities	$ 305,000	$ 4,000	$ 165,000