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(Common Units) (Narrative) (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Feb. 01, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
yr
$ / shares
shares
Dec. 31, 2023
USD ($)
Boston Properties Limited Partnership      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $   $ 1,500,501 $ 1,347,575
MYLTIP | Boston Properties Limited Partnership      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Vesting Period   3 years  
Unvested MYLTIP Units [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
unvested MYLTIP distributions as compared to total distributions (percentage)   10.00%  
MYLTIP 2021      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Final awards percentage of target 112.00%    
Value of MYLTIP Awards | $ $ 12,600    
Forfeitures, in units 155,625    
OP Units [Member]      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
OP Units for redemption (in shares)   951,881  
Restriction on redemption of OP Unit to Common Stock (in years) | yr   1  
Redemption of OP Unit equivalent to Common Stock (in shares)   1  
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $   $ 1,500,000  
Closing price of common stock (in dollars per share) | $ / shares   $ 80.46  
Vested 2012 OPP units and MYLTIPS      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
OP Units for redemption (in shares)   105,814