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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | $ 129,694 | $ 152,585 | $ 393,377 | $ 448,639
Operating expenses | [1] | (51,317) | (58,618) | (156,313) | (175,665)
Net operating income |  | 78,377 | 93,967 | 237,064 | 272,974
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 50,744 | 52,203 | 148,496 | 157,595
Operating expenses | [1] | (19,071) | (18,750) | (58,102) | (56,587)
Net operating income |  | 31,673 | 33,453 | 90,394 | 101,008
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 35,763 | 39,507 | 107,971 | 118,407
Operating expenses | [1] | (11,247) | (14,004) | (36,982) | (41,286)
Net operating income |  | 24,516 | 25,503 | 70,989 | 77,121
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 24,251 | 27,587 | 76,881 | 81,947
Operating expenses | [1] | (9,900) | (10,792) | (29,567) | (33,197)
Net operating income |  | 14,351 | 16,795 | 47,314 | 48,750
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [2] | 8,726 | 8,533 | 25,123 | 11,999
Operating expenses | [1],[2] | (3,523) | (2,625) | (9,689) | (4,993)
Net operating income | [2] | 5,203 | 5,908 | 15,434 | 7,006
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [3] | 8,526 | 24,275 | 30,328 | 76,129
Operating expenses | [1],[3] | (4,837) | (12,061) | (17,513) | (38,238)
Net operating income | [3] | 3,689 | 12,214 | 12,815 | 37,891
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [4] | 1,684 | 480 | 4,578 | 2,562
Operating expenses | [1],[4] | (2,739) | (386) | (4,460) | (1,364)
Net operating income | [4] | $ (1,055) | $ 94 | $ 118 | $ 1,198
[1] | Includes property operating expense, real estate taxes and third party management expense.
[2] | On June 22, 2015 the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2016. In addition, net operating income for the three and nine months ended September 30, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture.
[3] | See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment.
[4] | Increase in revenue and operating expenses primarily relates to the third party management operations of the Subaru Headquarters Development and third party management of the MAP Venture.

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