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Commitments And Contingencies (Details)
$ in Thousands
 12 Months Ended
Jan. 24, 2025
Dec. 09, 2024
USD ($)
Dec. 31, 2024
USD ($)
ft²
Real_Estate_Properties
Dec. 31, 2023
USD ($)
Oct. 02, 2023
USD ($)
ft²
Jan. 05, 2023
ft²
Dec. 31, 2019
USD ($)
Commitments And Contingencies [Line Items]              
Letter of credit and performance obligations     $ 20,300        
Note receivable, net     4,947 $ 1,714      
Accrued Liabilities   $ 2,200         $ 1,500
Payments for Legal Settlements   $ 2,700          
Loss Contingency, Portion Not Accrued     31,000        
Property insurance program per occurrence limits     1,000,000        
Per occurrence limit for NBCR Coverage     1,000,000        
Value of program trigger     $ 200,000        
Coinsurance of program trigger     20.00%        
Program trigger deductible     20.00%        
Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions     $ 330,000        
Annual aggregate limit of the earthquake insurance which covers San Francisco and Los Angeles regions     330,000        
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles     $ 30,000        
Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles     5.00%        
Per Occurrence Limit of Earthquake Insurance Seattle     $ 110,000        
Annual Aggregate Limit of Earthquake Insurance Seattle     $ 110,000        
Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle     2.00%        
Subsequent Event [Member]              
Commitments And Contingencies [Line Items]              
Loss Contingency, Number of Defendants 80            
Construction in Progress              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²     2,300,000        
Number of real estate properties | Real_Estate_Properties     7        
Boston Properties Limited Partnership              
Commitments And Contingencies [Line Items]              
Note receivable, net     $ 4,947 $ 1,714      
Operating partnership guarantee to cover liabilities of IXP     20,000        
767 Venture, LLC [Member]              
Commitments And Contingencies [Line Items]              
Maximum funding obligation     6,400        
Property insurance program per occurrence limits     1,625,000        
Metropolitan Square              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²         657,000    
Debt Instrument, Unused Borrowing Capacity, Amount         $ 100,000    
Debt Instrument, Interest Rate, Stated Percentage         12.00%    
Metropolitan Square | Affiliated Entity              
Commitments And Contingencies [Line Items]              
Note receivable, net     4,900        
Metropolitan Square | Scenario, Plan | Affiliated Entity              
Commitments And Contingencies [Line Items]              
Loans and Leases Receivable, Loans in Process         $ 20,000    
Metropolitan Square | Metropolitan Square              
Commitments And Contingencies [Line Items]              
Ownership Percentage         20.00%    
601 Lexington Avenue              
Commitments And Contingencies [Line Items]              
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP     1,350,000        
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism     750,000        
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism     600,000        
Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism     $ 1,750,000        
Office and Life Sciences Building [Member]              
Commitments And Contingencies [Line Items]              
Number of real estate properties | Real_Estate_Properties     163        
Office and Life Sciences Building [Member] | Construction in Progress              
Commitments And Contingencies [Line Items]              
Number of real estate properties | Real_Estate_Properties     5        
Office and Life Sciences Building [Member] | 290 Binney Street | Construction in Progress              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²     573,000     573,000  
Consolidated Entities, Ownership Percentage     55.00%        
Leased percentage     100.00%     100.00%  
Office and Life Sciences Building [Member] | 250 Binney Street              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²     67,000