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ACQUISITIONS AND DISPOSITIONS - Disposals (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 property | Mar. 31, 2020 USD ($) property | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) ft² | Dec. 31, 2019 property
Disposal Group |  |  |  |  |
Ownership sold, percentage |  |  |  | 100.00% |
Disposed Property Information |  |  |  |  |
Sales Price |  | $ 0 |  | $ 652,891 |
Gain on sale of real estate |  | 0 |  | 377,581 |
Impairment of real estate |  | $ 0 | $ 2,800 | 66,200 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Sales Price |  |  |  | 694,566 |
Transaction Costs |  |  |  | 13,948 |
Gain on sale of real estate |  |  |  | $ 377,581 |
March Oakland Properties, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Square Feet | ft² |  |  |  | 975,596 |
Sales Price |  |  |  | $ 512,016 |
Transaction Costs |  |  |  | 8,971 |
Gain on sale of real estate |  |  |  | $ 289,779 |
830 1st Street, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Square Feet | ft² |  |  |  | 247,337 |
Sales Price |  |  |  | $ 116,550 |
Transaction Costs |  |  |  | 2,438 |
Gain on sale of real estate |  |  |  | $ 45,710 |
260 Townsend Street, San Francisco, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Square Feet | ft² |  |  |  | 66,682 |
Sales Price |  |  |  | $ 66,000 |
Transaction Costs |  |  |  | 2,539 |
Gain on sale of real estate |  |  |  | $ 42,092 |
Two Office Properties and One Developmental Site, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposal Group |  |  |  |  |
Ownership sold, percentage | 100.00% |  |  |  |
Office properties |  |  |  |  |
Disposed Property Information |  |  |  |  |
Number of real estate properties sold | property |  | 8 |  |  | 8
Office properties | Two Office Properties and One Developmental Site, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Number of real estate properties sold | property | 2 |  |  |  |
Development site |  |  |  |  |
Disposed Property Information |  |  |  |  |
Number of real estate properties sold | property |  | 1 |  |  | 1
Development site | Two Office Properties and One Developmental Site, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Disposed Property Information |  |  |  |  |
Number of real estate properties sold | property | 1 |  |  |  |

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