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Investments in Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments in Properties    
Land $ 1,106,392 $ 804,830
Acquired ground leases 10,308 10,725
Buildings and improvements 21,335,396 15,449,884
Tenant improvements 690,892 621,153
Total investments in operating properties 23,142,988 16,886,592
Accumulated depreciation and amortization (5,555,221) (4,536,169)
Net Investments in Operating Properties 17,587,767 12,350,423
Construction in progress and space held for development 2,768,325 1,732,555
Land Held For Future Development 226,862 147,597
Investments in properties, net $ 20,582,954 $ 14,230,575