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Real Estate Intangibles (Tables)
9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Real Estate Intangibles Excluding Those Related to Ground Lease or Classified as Held For Sale
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):
 September 30, 2024December 31, 2023
Assets:
In place lease intangibles$2,079,917 $2,001,827 
Above market tenant leases71,892 66,663 
Lease commissions117,080 97,980 
Gross historical cost2,268,889 2,166,470 
Accumulated amortization(1,784,900)(1,651,656)
Net book value$483,989 $514,814 
Liabilities:
Below market tenant leases$71,224 $70,364 
Accumulated amortization(51,400)(47,939)
Net book value$19,824 $22,425 
Summary of Real Estate Intangible Amortization Income (Expense)
The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Rental income related to (above)/below market tenant leases, net$(189)$152 $(274)$327 
Amortization related to in place lease intangibles and lease commissions(61,872)(47,556)(169,539)(157,481)