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Investments in Properties (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 | ​ | ​ | As of December 31, 2022
Land | ​ | $ | 1,064,058 | ​ | ​ | $ | 1,061,408
Acquired ground lease | ​ | ​ | 87 | ​ | ​ | ​ | 6,006
Buildings and improvements | ​ | ​ | 23,998,641 | ​ | ​ | ​ | 24,287,103
Tenant improvements | ​ | ​ | 824,244 | ​ | ​ | ​ | 781,540
​ | ​ | ​ | 25,887,030 | ​ | ​ | ​ | 26,136,057
Accumulated depreciation and amortization | ​ | ​ | (7,489,193) | ​ | ​ | ​ | (7,268,981)
Investments in operating properties, net | ​ | ​ | 18,397,837 | ​ | ​ | ​ | 18,867,076
Construction in progress and space held for development | ​ | ​ | 5,020,464 | ​ | ​ | ​ | 4,789,134
Land held for future development | ​ | ​ | 179,959 | ​ | ​ | ​ | 118,452
Investments in properties, net | ​ | $ | 23,598,260 | ​ | ​ | $ | 23,774,662

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