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Dispositions - Additional Information (Details) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) ft² | May 27, 2020 USD ($) ft² $ / ft² | Mar. 06, 2020 USD ($) ft² | Dec. 31, 2019 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Area of office and retail properties | ft² | 13,100,000 |  |  |
Notes and mortgages payable | $ 3,812,716,000 |  |  | $ 3,809,643,000
1633 Broadway [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Sale percentage of office and retail properties |  | 10.00% |  |
Area of office and retail properties | ft² |  | 2,500,000 |  |
Valuation of office and retail properties |  | $ 2,400,000,000 |  |
Cost per square foot | $ / ft² |  | 960 |  |
Notes and mortgages payable |  | $ 1,250,000,000 |  |
Sale agreement amount |  | $ 111,984,000 |  |
Minority interest in jount ventures decrease, percentage | 10.00% |  |  |
1899 Pennsylvania Avenue [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Area of office and retail properties | ft² |  |  | 191,000 |
Sale agreement amount |  |  | $ 115,000,000 |

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