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Investment in Real Estate - Dispositions (Details) $ in Millions |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2019 USD ($) ft² | Jul. 24, 2019 USD ($) ft² | Jul. 27, 2018 USD ($) ft² | Apr. 10, 2018 USD ($) ft² | Mar. 01, 2018 USD ($) ft² | Jan. 31, 2018 USD ($) ft² | Jan. 25, 2018 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  | 1,417,930 | 815,226
Sales Price | $ |  |  |  |  |  |  |  | $ 148.4 | $ 464.8
Campus Center Office |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  | 471,580 |  |  |  |  |  |  |
Sales Price | $ |  | $ 70.3 |  |  |  |  |  |  |
Campus Center Land |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² | 946,350 |  |  |  |  |  |  |  |
Sales Price | $ | $ 78.1 |  |  |  |  |  |  |  |
Embarcadero Place |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  | 197,402 |  |
Sales Price | $ |  |  |  |  |  |  | $ 136.0 |  |
2600 Campus Drive |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  | 63,050 |  |  |
Sales Price | $ |  |  |  |  |  | $ 22.5 |  |  |
2180 Sand Hill |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  | 45,613 |  |  |  |
Sales Price | $ |  |  |  |  | $ 82.5 |  |  |  |
9300 Wilshire |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 61,422 |  |  |  |  |
Sales Price | $ |  |  |  | $ 13.8 |  |  |  |  |
Peninsula Office Park |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 447,739 |  |  |  |  |  |
Sales Price | $ |  |  | $ 210.0 |  |  |  |  |  |

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