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Depreciation is computed on a straight line basis over the estimated useful lives of the assets (Details)	12 Months Ended
	Dec. 31, 2014
Depreciation is computed on a straight line basis over the estimated useful lives of the assets:
Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures and equipment	3 to 7 years