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Real Estate Schedule of Real Estate Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Real Estate Properties [Line Items]    
Land $ 5,309,234 $ 5,318,724
Right-of-use assets - finance leases 372,747 372,922
Operating Lease, Right-of-Use Asset 321,063 334,767
Land held for future development [1] 562,909 714,050
Buildings and improvements 17,312,118 17,149,702
Tenant improvements 4,042,562 3,866,371
Furniture, Fixtures and Equipment 60,353 57,136
Construction in progress 1,322,608 764,640
Total 29,303,594 28,578,312
Less: accumulated depreciation (8,008,908) (7,528,057)
Total real estate 21,294,686 21,050,255
Boston Properties Limited Partnership    
Real Estate Properties [Line Items]    
Land 5,215,723 5,224,015
Right-of-use assets - finance leases 372,747 372,922
Operating Lease, Right-of-Use Asset 321,063 334,767
Land held for future development [1] 562,909 714,050
Buildings and improvements 17,044,157 16,878,146
Tenant improvements 4,042,562 3,866,371
Furniture, Fixtures and Equipment 60,353 57,136
Construction in progress 1,322,608 764,640
Total 28,942,122 28,212,047
Less: accumulated depreciation (7,875,405) (7,397,882)
Total real estate $ 21,066,717 $ 20,814,165
[1] Includes pre-development costs.