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Real Estate Intangibles (Tables)
 3 Months Ended
Mar. 31, 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):
 March 31, 2024December 31, 2023
Assets:
In place lease intangibles$1,988,594 $2,001,827 
Above market tenant leases66,663 66,663 
Lease commissions103,658 97,980 
Gross historical cost2,158,915 2,166,470 
Accumulated amortization(1,682,328)(1,651,656)
Net book value$476,587 $514,814 
Liabilities:
Below market tenant leases$70,364 $70,364 
Accumulated amortization(49,162)(47,939)
Net book value$21,202 $22,425 
Summary of Real Estate Intangible Amortization Income (Expense)
The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):
Three Months Ended March 31,
20242023
Rental income related to (above)/below market tenant leases, net$(31)$45 
Amortization related to in place lease intangibles and lease commissions(46,791)(56,151)