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Commitments And Contingencies (Details)
$ in Thousands
 12 Months Ended
Jun. 27, 2022
USD ($)
Dec. 31, 2022
USD ($)
ft²
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 29, 2022
ft²
Jun. 26, 2022
USD ($)
May 09, 2019
ft²
Commitments And Contingencies [Line Items]              
Letter of credit and performance obligations   $ 26,500          
Notes receivable, net   0 $ 9,641        
Proceeds from note receivable   10,000 10,035 $ 6,397      
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   3.00%          
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%          
Affiliate of Bernstein Companies [Member]              
Commitments And Contingencies [Line Items]              
Notes receivable, net           $ 10,000  
Proceeds from note receivable $ 10,000            
Note receivable fixed interest rate           8.00%  
Proceeds from Interest Received $ 1,600            
Boston Properties Limited Partnership              
Commitments And Contingencies [Line Items]              
Notes receivable, net   $ 0 9,641        
Proceeds from note receivable   10,000 $ 10,035 $ 6,397      
Operating partnership guarantee to cover liabilities of IXP   20,000          
767 Venture, LLC [Member]              
Commitments And Contingencies [Line Items]              
Maximum funding obligation   13,700          
Property insurance program per occurrence limits   1,625,000          
325 Main Street              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²         414,000   115,000
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          
Future Residential Building [Member] | 325 Main Street              
Commitments And Contingencies [Line Items]              
Net Rentable Area (in sf) | ft²   200,000          
Affordable Housing requirement   25.00%          
Home Ownership Units [Member] | Future Residential Building [Member] | 325 Main Street              
Commitments And Contingencies [Line Items]              
Affordable Housing requirement   20.00%