Real Estate Intangibles (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 235,000	$ (972,000)	$ 596,000	$ 452,000
Property operating expenses related to above/below market ground leases, net	(303,000)	(555,000)	(909,000)	(1,219,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (78,782,000)	$ (22,271,000)	$ (168,441,000)	$ (78,114,000)