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Unsecured Senior Notes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 01, 2023
May 15, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]          
Proceeds from unsecured senior notes     $ 747,727 $ 749,557 $ 1,695,996
Repayments of Unsecured Debt     500,000 0 1,841,500
Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Proceeds from unsecured senior notes     747,727 749,557 1,695,996
Repayments of Unsecured Debt     500,000 $ 0 $ 1,841,500
Senior Notes | Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Debt     $ 10,550,000    
Debt Instrument, Covenant Description     The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt.    
Leverage ratio     60.00%    
Secured debt leverage ratio - maximum     50.00%    
Interest Coverage - Minimum     1.50    
Unencumbered Asset Value - Minimum     150.00%    
Debt Instrument, Covenant Compliance     At December 31, 2023, BPLP was in compliance with each of these financial restrictions and requirements.    
6.619% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Debt   $ 750,000 $ 750,000    
Debt Instrument, Interest Rate, Stated Percentage   6.50% 6.50%    
Senior Notes Pricing   99.697%      
Debt Instrument, Interest Rate, Effective Percentage   6.619% 6.619% [1]    
Proceeds from unsecured senior notes   $ 741,300      
3.279% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership          
Debt Instrument [Line Items]          
Debt $ 500,000        
Debt Instrument, Interest Rate, Stated Percentage 3.125%        
Repayments of Unsecured Debt $ 507,800        
Debt Instrument, Increase, Accrued Interest $ 7,800        
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.