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Investments in Properties (Tables) | 3 Months Ended
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Mar. 31, 2023
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, 2023 | ​ | ​ | As of December 31, 2022
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
​ | ​ | ​ | 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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