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Investments in Properties (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Investments in Properties |  |
Land | $ 1,033,770 | $ 1,019,723
Acquired ground lease | 6,051 | 6,721
Buildings and improvements | 22,319,146 | 21,914,091
Tenant improvements | 706,966 | 684,915
Total investments in operating properties | 24,065,933 | 23,625,450
Accumulated depreciation and amortization | (6,665,118) | (6,210,281)
Investments in operating properties, net | 17,400,815 | 17,415,169
Construction in progress and space held for development | 3,362,114 | 3,213,389
Land held for future development | 37,460 | 133,683
Investments in properties, net | $ 20,800,389 | $ 20,762,241

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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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