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Commitments And Contingencies (Details)
$ in Thousands
 10 Months Ended 12 Months Ended
Oct. 17, 2025
USD ($)
Oct. 16, 2025
USD ($)
Jan. 24, 2025
Dec. 09, 2024
USD ($)
Dec. 15, 2025
Dec. 31, 2025
USD ($)
ft²
Oct. 02, 2023
USD ($)
ft²
Jan. 05, 2023
ft²
Dec. 31, 2019
USD ($)
Commitments And Contingencies [Line Items]                  
Letter of credit and performance obligations           $ 23,200      
Accrued Liabilities       $ 2,200         $ 1,500
Payments for Legal Settlements       $ 2,700          
Loss Contingency, Portion Not Accrued           25,000      
Loss Contingency, Number of Defendants     90   85        
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%      
Construction in Progress                  
Commitments And Contingencies [Line Items]                  
Net Rentable Area (in sf) | ft²           3,500,000      
Boston Properties Limited Partnership                  
Commitments And Contingencies [Line Items]                  
Operating partnership guarantee to cover liabilities of IXP           $ 20,000      
767 Venture, LLC [Member]                  
Commitments And Contingencies [Line Items]                  
Property insurance program per occurrence limits           $ 1,625,000      
3 Hudson Boulevard [Member]                  
Commitments And Contingencies [Line Items]                  
Net Rentable Area (in sf) | ft²           2,000,000.0      
Ownership Percentage           25.00%      
3 Hudson Boulevard [Member] | Notes Receivables [Member] | Unconsolidated Properties | Related Party                  
Commitments And Contingencies [Line Items]                  
Related party note receivable, net   $ 80,000              
Debt Instrument, Basis Spread on Variable Rate 7.25% 3.61%              
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           $ 9,400      
Metropolitan Square | Scenario, Plan | Affiliated Entity                  
Commitments And Contingencies [Line Items]                  
Other Commitment             $ 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      
3 Hudson Boulevard [Member] | Unconsolidated Properties                  
Commitments And Contingencies [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   3.61%              
3 Hudson Boulevard [Member] | Affiliated Entity                  
Commitments And Contingencies [Line Items]                  
Note receivable, net           $ 18,400      
3 Hudson Boulevard [Member] | Scenario, Plan | Affiliated Entity                  
Commitments And Contingencies [Line Items]                  
Other Commitment $ 50,000                
Debt Instrument, Basis Spread on Variable Rate 7.25%                
Office Building [Member]                  
Commitments And Contingencies [Line Items]                  
Net Rentable Area (in sf) | ft²           409,200      
Office Building [Member] | 290 Binney Street | Construction in Progress                  
Commitments And Contingencies [Line Items]                  
Net Rentable Area (in sf) | ft²               573,000  
Consolidated Entities, Ownership Percentage           55.00%      
Leased percentage               100.00%  
Office Building [Member] | 250 Binney Street                  
Commitments And Contingencies [Line Items]                  
Net Rentable Area (in sf) | ft²           67,000