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Investments in Properties (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments in Properties |
Schedule of Investments in Properties | A summary of our investments in properties is below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property Type | ​ | As of December 31, 2022 | ​ | ​ | As of December 31, 2021
Land | ​ | $ | 1,061,408 | ​ | ​ | $ | 1,019,723
Acquired ground lease | ​ | ​ | 6,006 | ​ | ​ | ​ | 6,721
Buildings and improvements | ​ | ​ | 24,287,103 | ​ | ​ | ​ | 21,914,091
Tenant improvements | ​ | ​ | 781,540 | ​ | ​ | ​ | 684,915
​ | ​ | ​ | 26,136,057 | ​ | ​ | ​ | 23,625,450
Accumulated depreciation and amortization | ​ | ​ | (7,268,981) | ​ | ​ | ​ | (6,210,281)
Investments in operating properties, net | ​ | ​ | 18,867,076 | ​ | ​ | ​ | 17,415,169
Construction in progress and space held for development | ​ | ​ | 4,789,134 | ​ | ​ | ​ | 3,213,389
Land held for future development | ​ | ​ | 118,452 | ​ | ​ | ​ | 133,683
Investments in properties, net | ​ | $ | 23,774,662 | ​ | ​ | $ | 20,762,241

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