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Investments in Unconsolidated Joint Ventures - Additional Information (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 11, 2019 USD ($) ft² Extensions Building | Aug. 21, 2019 USD ($) ft² | Mar. 29, 2019 | Feb. 07, 2019 USD ($) ft² Extensions | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of Class A office and retail properties | ft² |  |  |  |  | 13,100,000 |  |
Mortgage financing loan amount |  |  |  |  | $ 1,259,843,000 | $ 16,700,000 | $ 991,556,000
Mortgage loan |  |  |  |  | $ 3,809,643,000 | $ 3,599,800,000 |
RDF [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage in residential fund |  |  | 7.40% |  |  |  |
Percentage of interest third party ownership |  |  | 92.60% |  |  |  |
111 Sutter Street [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of Class A office and retail properties | ft² |  |  |  | 293,000 |  |  |
Business combination, consideration transferred |  |  |  | $ 227,000,000 |  |  |
Percentage of ownership interest in new joint venture |  |  |  | 49.00% | 49.00% |  |
Percentage of ownership interest in joint venture held by co-venturer |  |  |  | 51.00% |  |  |
Mortgage financing loan amount |  |  |  | $ 138,200,000 |  |  |
Debt instrument, term |  |  |  | 4 years |  |  |
Debt instrument number of extensions | Extensions |  |  |  | 3 |  |  |
Debt instrument term of extension |  |  |  | 1 year |  |  |
111 Sutter Street [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Mortgage financing loan, interest only basis points at LIBOR |  |  |  | 2.15% |  |  |
One Steuart Lane [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest in new joint venture |  |  |  |  | 35.00% |  |
Property funds, ownership percentage |  |  | 1.90% |  | 2.60% |  |
One Steuart Lane [Member] | RDF [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property funds, ownership percentage |  |  | 25.00% |  | 35.00% |  |
Percentage of interest acquired |  |  |  |  | 10.00% |  |
Additional interest acquired amount |  |  |  |  | $ 19,110,000 |  |
55 Second Street [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of Class A office and retail properties | ft² |  | 384,000 |  |  |  |  |
Percentage of ownership interest in new joint venture |  |  |  |  | 44.10% |  |
Mortgage financing loan amount |  | $ 50,000,000 |  |  |  |  |
Transaction valued property value |  | 401,700,000 |  |  |  |  |
Mortgage loan assumed in connection with acquisition |  | $ 137,500,000 |  |  |  |  |
Mortgage loan |  |  |  |  | $ 187,500,000 |  |
Mortgage financing loan, interest-only at fixed rate |  | 3.88% |  |  |  |  |
Mortgage financing loan, maturity period |  | 2026-10 |  |  |  |  |
Market Center [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of Class A office and retail properties | ft² | 747,000 |  |  |  |  |  |
Percentage of ownership interest in new joint venture | 67.00% |  |  |  | 67.00% |  |
Mortgage financing loan amount | $ 402,000,000 |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |
Debt instrument number of extensions | Extensions | 2 |  |  |  |  |  |
Debt instrument term of extension | 1 year |  |  |  |  |  |
Mortgage financing loan, interest-only at fixed rate | 3.07% |  |  |  |  |  |
Number of buildings acquired | Building | 2 |  |  |  |  |  |
Transaction value of property | $ 722,000,000 |  |  |  |  |  |
Market Center [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Mortgage financing loan, interest only basis points at LIBOR | 1.50% |  |  |  |  |  |

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