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Investments in Properties (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments in Properties |
Schedule of Investments in Properties | ​ A summary of our investments in properties is below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property Type | ​ | As of September 30, 2025 | ​ | ​ | As of December 31, 2024
Land | ​ | $ | 1,194,312 | ​ | ​ | $ | 1,108,251
Acquired ground lease | ​ | ​ | 97 | ​ | ​ | ​ | 86
Buildings and improvements | ​ | ​ | 28,051,036 | ​ | ​ | ​ | 25,567,155
Tenant improvements | ​ | ​ | 949,446 | ​ | ​ | ​ | 883,502
​ | ​ | ​ | 30,194,891 | ​ | ​ | ​ | 27,558,994
Accumulated depreciation and amortization | ​ | ​ | (9,665,380) | ​ | ​ | ​ | (8,641,331)
Investments in operating properties, net | ​ | ​ | 20,529,511 | ​ | ​ | ​ | 18,917,663
Construction in progress and space held for development | ​ | ​ | 5,422,338 | ​ | ​ | ​ | 5,164,334
Land held for future development | ​ | ​ | 66,668 | ​ | ​ | ​ | 38,785
Investments in properties, net | ​ | $ | 26,018,517 | ​ | ​ | $ | 24,120,782

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