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Investments in Properties (Tables) | 3 Months Ended
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Mar. 31, 2025
Investments in Properties |
Schedule of Investments in Properties | ​ A summary of our investments in properties is below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property Type | ​ | As of March 31, 2025 | ​ | ​ | As of December 31, 2024
Land | ​ | $ | 1,114,015 | ​ | ​ | $ | 1,108,251
Acquired ground lease | ​ | ​ | 89 | ​ | ​ | ​ | 86
Buildings and improvements | ​ | ​ | 25,940,229 | ​ | ​ | ​ | 25,567,155
Tenant improvements | ​ | ​ | 893,631 | ​ | ​ | ​ | 883,502
​ | ​ | ​ | 27,947,964 | ​ | ​ | ​ | 27,558,994
Accumulated depreciation and amortization | ​ | ​ | (8,856,535) | ​ | ​ | ​ | (8,641,331)
Investments in operating properties, net | ​ | ​ | 19,091,429 | ​ | ​ | ​ | 18,917,663
Construction in progress and space held for development | ​ | ​ | 4,973,266 | ​ | ​ | ​ | 5,164,334
Land held for future development | ​ | ​ | 69,089 | ​ | ​ | ​ | 38,785
Investments in properties, net | ​ | $ | 24,133,784 | ​ | ​ | $ | 24,120,782

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