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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 ($) ft²	Nov. 16, 2017 USD ($) ft²	Mar. 21, 2017 USD ($) ft²	Feb. 14, 2017 USD ($) ft²	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 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	823,261
Sales Price | $											$ 148.4	$ 464.8	$ 436.8
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 Road
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
222 Kearny Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²										148,797
Sales Price | $										$ 51.8
3402 Pico
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²									50,687
Sales Price | $									$ 35.0
Pinnacle I and II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²								623,777
Sales Price | $								$ 350.0

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