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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% |  |  |  |  |

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