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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic Earnings:          
Net income attributable to the company's common shareholders / unitholders $ 111,882 $ 184,537 $ 848,947 $ 496,223 $ 862,227
Net income attributable to the company's common shareholders / unitholders (in shares / units)     156,726,000 156,116,000 155,432,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)     $ 5.42 $ 3.18 $ 5.55
Allocation of undistributed earnings to participating securities     $ (891) $ 0 $ (748)
Allocation of undistributed earnings to participating securities (in shares / units)     0 0 0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)     $ (0.01) $ 0 $ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic     $ 848,056 $ 496,223 $ 861,479
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)     156,726,000 156,116,000 155,432,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)     $ 5.41 $ 3.18 $ 5.54
Effect of Dilutive Securities:          
Stock Based Compensation     $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units)     411,000 260,000 85,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)     $ (0.01) $ (0.01) $ 0
Diluted Earnings:          
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders     $ 848,056 $ 496,223 $ 861,479
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)     157,137,000 156,376,000 155,517,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)     $ 5.40 $ 3.17 $ 5.54
Boston Properties Limited Partnership          
Redeemable Common Units     17,634,000 17,034,000 17,211,000
Basic Earnings:          
Net income attributable to the company's common shareholders / unitholders     $ 957,265 $ 561,993 $ 979,979
Net income attributable to the company's common shareholders / unitholders (in shares / units) 174,423,000   174,360,000 173,150,000 172,643,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)     $ 5.49 $ 3.25 $ 5.68
Allocation of undistributed earnings to participating securities     $ (991) $ 0 $ (830)
Allocation of undistributed earnings to participating securities (in shares / units)     0 0 0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)     $ (0.01) $ 0 $ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic     $ 956,274 $ 561,993 $ 979,149
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)     174,360,000 173,150,000 172,643,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)     $ 5.48 $ 3.25 $ 5.67
Effect of Dilutive Securities:          
Stock Based Compensation     $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units)     411,000 260,000 85,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)     $ (0.01) $ (0.01) $ 0
Diluted Earnings:          
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders     $ 956,274 $ 561,993 $ 979,149
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)     174,771,000 173,410,000 172,728,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)     $ 5.47 $ 3.24 $ 5.67