Real Estate Intangibles (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ (424,000)	$ 290,000	$ (217,000)	$ 245,000
Property operating expenses related to above/below market ground leases, net	(334,000)	(299,000)	(653,000)	(610,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (31,973,000)	$ (59,603,000)	$ (56,297,000)	$ (138,996,000)