Real Estate Intangibles (Tables)

6 Months Ended

Jun. 30, 2015

Real Estate Intangibles (Tables) [Abstract]

Summary of real estate intangibles excluding those classified as held for sale

		June 30, 2015		December 31, 2014
Assets:
	In place lease intangibles	$	1,049,407	$	988,290
	Above market tenant leases		82,298		65,684
	Below market ground leases		61,159		62,426
	Lease commissions		21,764		19,536
	Gross historical cost		1,214,628		1,135,936
	Accumulated amortization		(814,084)		(776,501)
	Net book value	$	400,544	$	359,435
	Weighted-average amortization period in years		16.2		17.8
Liabilities:
	Below market tenant leases	$	89,909	$	91,168
	Above market ground leases		7,860		7,859
	Gross historical cost		97,769		99,027
	Accumulated amortization		(42,940)		(40,891)
	Net book value	$	54,829	$	58,136
	Weighted-average amortization period in years		15.5		14.5

Schedule of Real Estate Intangible Amortization

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2015		2014		2015		2014
Rental income related to above/below market tenant leases, net	$	(424)	$	290	$	(217)	$	245
Property operating expenses related to above/below market ground leases, net		(334)		(299)		(653)		(610)
Depreciation and amortization related to in place lease intangibles and lease commissions		(31,973)		(59,603)		(56,297)		(138,996)

Schedule of the future estimated aggregate amortization of intangible assets and liabilities

		Assets		Liabilities
2015	$	58,072	$	$3,364
2016		72,338		6,512
2017		43,880		6,052
2018		29,943		5,583
2019		23,946		5,325
Thereafter		172,365		27,993
Total	$	400,544	$	54,829