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Investment in Real Estate - Schedule of Dispositions (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) ft² | Mar. 31, 2017 USD ($) ft² | Feb. 28, 2017 USD ($) ft² | Nov. 30, 2016 USD ($) ft² | Jun. 30, 2016 USD ($) ft² | Apr. 30, 2016 USD ($) ft² | Jan. 31, 2016 USD ($) ft² | Sep. 29, 2015 USD ($) ft² | May 31, 2015 USD ($) ft² | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($) ft² | Nov. 16, 2017 USD ($) | Jan. 07, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  |  | 823,261 | 921,343 | 483,862 |  |
Sales Price |  |  |  |  |  |  |  |  |  | $ 436,800 | $ 367,400 | $ 179,000 |  |
Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, held-for-sale |  |  |  |  |  |  |  |  |  | $ 0 | $ 216,000 |  |  |
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 |  |  | $ 51,800 |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Pinnacle I and II | Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 216,000 |
Bayhill Office Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  | 554,328 |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 215,000 |  |  |  |  |  |  |
Patrick Henry |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  | 70,520 |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  |
One Bay Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  | 195,739 |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  | $ 53,400 |  |  |  |  |  |  |  |  |
12655 Jefferson |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 100,756 |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  | $ 80,000 |  |  |  |  |  |  |  |  |  |
First Financial |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  | 223,679 |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  | $ 89,000 |  |  |  |  |
Bay Park Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  | 260,183 |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  | $ 90,000 |  |  |  |  |  |
1455 Market |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00%

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