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Investment in Real Estate - Summary of Property Sold (Details) $ in Millions |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2016 USD ($) ft² building | Apr. 07, 2016 USD ($) ft² building | Jan. 14, 2016 USD ($) ft² building | Mar. 06, 2015 USD ($) ft² building | Sep. 30, 2016 USD ($) ft² building | Sep. 30, 2015 USD ($) ft² building | Jan. 07, 2015
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  |  |  |  | 6 | 2 |
Area of real estate property (in square feet) | ft² |  |  |  |  | 820,587 | 483,862 |
Proceeds from sale of real estate | $ |  |  |  |  | $ 287.4 | $ 179.0 |
Bayhill Office Center |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  |  | 4 |  |  |  |
Area of real estate property (in square feet) | ft² |  |  | 554,328 |  |  |  |
Proceeds from sale of real estate | $ |  |  | $ 215.0 |  |  |  |
Patrick Henry Drive |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  | 1 |  |  |  |  |
Area of real estate property (in square feet) | ft² |  | 70,520 |  |  |  |  |
Proceeds from sale of real estate | $ |  | $ 19.0 |  |  |  |  |
One Bay Plaza |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building | 1 |  |  |  |  |  |
Area of real estate property (in square feet) | ft² | 195,739 |  |  |  |  |  |
Proceeds from sale of real estate | $ | $ 53.4 |  |  |  |  |  |
First Financial |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  |  |  | 1 |  |  |
Area of real estate property (in square feet) | ft² |  |  |  | 223,679 |  |  |
Proceeds from sale of real estate | $ |  |  |  | $ 89.0 |  |  |
Bay Park Plaza |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  |  |  | 1 |  |  |
Area of real estate property (in square feet) | ft² |  |  |  | 260,183 |  |  |
Proceeds from sale of real estate | $ |  |  |  | $ 90.0 |  |  |
1455 Market Street |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |
Real estate property, ownership (as a percent) |  |  |  |  |  |  | 45.00%

X
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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