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Investments in Properties (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investments in Properties |  |
Land | $ 1,096,898 | $ 1,061,408
Acquired ground lease | 6,132 | 6,006
Buildings and improvements | 25,154,186 | 24,287,103
Tenant improvements | 794,806 | 781,540
Total investments in operating properties | 27,052,022 | 26,136,057
Accumulated depreciation and amortization | (7,600,559) | (7,268,981)
Investments in operating properties, net | 19,451,463 | 18,867,076
Construction in progress and space held for development | 4,563,578 | 4,789,134
Land held for future development | 194,564 | 118,452
Investments in properties, net | $ 24,209,605 | $ 23,774,662

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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include (1) land available-for-sale; (2) investments in building and building improvements; (3) tenant allowances; and (4) acquired ground leases. + References No definition available. + Details
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