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Investment in Real Estate (Details) ft² in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 30, 2020 USD ($) ft² | Sep. 30, 2020 USD ($) property | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) property | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) property
Real Estate [Abstract] |  |  |  |  |  |
Land |  | $ 1,313,412,000 |  | $ 1,313,412,000 |  | $ 1,313,412,000
Building and improvements |  | 5,286,780,000 |  | 5,286,780,000 |  | 5,189,342,000
Tenant improvements |  | 677,305,000 |  | 677,305,000 |  | 631,459,000
Furniture and fixtures |  | 11,697,000 |  | 11,697,000 |  | 10,693,000
Property under development |  | 245,579,000 |  | 245,579,000 |  | 124,222,000
INVESTMENT IN REAL ESTATE, AT COST |  | $ 7,534,773,000 |  | $ 7,534,773,000 |  | $ 7,269,128,000
Number of properties acquired | property |  |  |  | 0 |  |
Number of dispositions | property |  |  |  | 0 |  |
Number of real-estate properties classified as held-for-sale | property |  | 0 |  | 0 |  | 0
Impairment loss |  | $ 0 | $ 0 | $ 0 | $ (52,201,000) |
Cash proceeds |  |  |  | $ 0 | $ 147,823,000 |
Hollywood Media Portfolio |  |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |  |
Ownership percentage sold | 49.00% |  |  |  |  |
Cash proceeds | $ 808,500,000 |  |  |  |  |
Portfolio valuation | $ 1,650,000,000 |  |  |  |  |
Percentage ownership retained | 51.00% |  |  |  |  |
Hollywood Media Portfolio |  |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |  |
Area | ft² | 2.2 |  |  |  |  |
Hollywood Media Portfolio | Specific Studio Properties |  |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |  |
Area | ft² | 1.1 |  |  |  |  |

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