Real Estate Intangibles

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Real Estate Intangibles

Real Estate Intangibles 

The following is a summary of our real estate intangibles, excluding those related to ground leases or classified as held for sale, as of the dates indicated (dollars in thousands):

	June 30, 2021		December 31, 2020
Assets:
In place lease intangibles	$	1,416,212	$	1,406,705
Above market tenant leases	53,066		52,621
Lease commissions	47,693		40,704
Gross historical cost	1,516,971		1,500,030
Accumulated amortization	(1,223,550)		(1,177,513)
Net book value	$	293,421	$	322,517
Weighted-average amortization period in years	10.7		10.5
Liabilities:
Below market tenant leases	$	74,183	$	77,851
Accumulated amortization	(41,552)		(40,871)
Net book value	$	32,631	$	36,980
Weighted-average amortization period in years	8.3		8.3

The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Rental income related to (above)/below market tenant leases, net	$	432	$	402	$	857	$	925
Amortization related to in place lease intangibles and lease commissions	(20,432)		(33,316)		(43,211)		(69,293)

The future estimated aggregate amortization of intangible assets and liabilities is as follows for the periods presented (in thousands):

	Assets		Liabilities
2021	$	40,278	$	3,904
2022	48,245		7,234
2023	34,780		5,092
2024	27,176		2,976
2025	21,943		2,447
Thereafter	120,999		10,978
Total	$	293,421	$	32,631