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Real Estate Intangibles - Summary of Real Estate Intangibles Excluding those Classified as Held For Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Gross historical cost | $ 1,990,830 | $ 1,945,458
Accumulated amortization | (1,543,457) | (1,484,048)
Net book value | 447,373 | 461,410
Liabilities: |  |
Below market tenant leases | 82,084 | 77,985
Accumulated amortization | (54,872) | (52,701)
Net book value | 27,212 | 25,284
In place lease intangibles |  |
Assets: |  |
Gross historical cost | 1,846,945 | 1,817,580
Above market tenant leases |  |
Assets: |  |
Gross historical cost | 66,354 | 57,203
Lease commissions |  |
Assets: |  |
Gross historical cost | $ 77,531 | $ 70,675

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