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Commitments And Contingencies (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2023
USD ($)
ft²
Real_Estate_Properties
Commitments And Contingencies [Line Items]  
Letter of credit and performance obligations $ 21,600
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%
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]  
Maximum funding obligation 11,200
Property insurance program per occurrence limits 1,625,000
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
Residential Properties [Member] | Scenario, Plan  
Commitments And Contingencies [Line Items]  
Net Rentable Area (in sf) | ft² 400,000
Office and Life Sciences Building [Member]  
Commitments And Contingencies [Line Items]  
Number of real estate properties | Real_Estate_Properties 170
Office and Life Sciences Building [Member] | Scenario, Plan  
Commitments And Contingencies [Line Items]  
Net Rentable Area (in sf) | ft² 1,100,000
Number of real estate properties 2