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Real Estate Intangibles
 6 Months Ended
Jun. 30, 2024
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, 2024December 31, 2023
Assets:
In place lease intangibles$2,016,507 $2,001,827 
Above market tenant leases66,663 66,663 
Lease commissions109,216 97,980 
Gross historical cost2,192,386 2,166,470 
Accumulated amortization(1,743,005)(1,651,656)
Net book value$449,381 $514,814 
Liabilities:
Below market tenant leases$70,364 $70,364 
Accumulated amortization(50,325)(47,939)
Net book value$20,039 $22,425 
The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Rental income related to (above)/below market tenant leases, net$(54)$130 $(85)$175 
Amortization related to in place lease intangibles and lease commissions(60,876)(53,774)(107,667)(109,925)