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INVESTMENT IN REAL ESTATE - Properties Sold (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) ft² | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership sold, percentage |  |  |  |  | 100.00%
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Sales Price |  |  |  | $ 0 | $ 941,032,000
Gain on sale of real estate | $ 0 | $ 302,000 |  | 0 | 433,104,000
Impairment of real estate | $ 0 | 0 | $ 0 | $ 0 | 69,000,000
Extinguishment of noncontrolling interest |  | $ 113,000 |  |  | 113,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Sales Price |  |  |  |  | 990,996,000
Transaction Costs |  |  |  |  | 18,350,000
Gain on sale of real estate |  |  |  |  | $ 433,104,000
March Oakland Properties, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Square Feet | ft² |  | 975,596 |  |  | 975,596
Sales Price |  |  |  |  | $ 512,016,000
Transaction Costs |  |  |  |  | 8,971,000
Gain on sale of real estate |  |  |  |  | $ 289,779,000
830 1st Street, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Square Feet | ft² |  | 247,337 |  |  | 247,337
Sales Price |  |  |  |  | $ 116,550,000
Transaction Costs |  |  |  |  | 2,438,000
Gain on sale of real estate |  |  |  |  | $ 45,710,000
260 Townsend Street, San Francisco, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Square Feet | ft² |  | 66,682 |  |  | 66,682
Sales Price |  |  |  |  | $ 66,000,000
Transaction Costs |  |  |  |  | 2,539,000
Gain on sale of real estate |  |  |  |  | $ 42,092,000
1333 Broadway, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Square Feet | ft² |  | 254,523 |  |  | 254,523
Sales Price |  |  |  |  | $ 115,430,000
Transaction Costs |  |  |  |  | 658,000
Gain on sale of real estate |  |  |  |  | $ 55,221,000
Union Square Properties, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Proceeds from Sale of Real Estate Held-for-investment [Abstract] |  |  |  |  |
Square Feet | ft² |  | 630,650 |  |  | 630,650
Sales Price |  |  |  |  | $ 181,000,000
Transaction Costs |  |  |  |  | 3,744,000
Gain on sale of real estate |  |  |  |  | $ 302,000

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