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Segment Information Summary of Net Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | $ 152,585 | $ 146,558 | $ 448,639 | $ 449,172
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 152,585 | 146,558 | 448,639 | 449,172
Operating expenses | [1] | (58,618) | (57,231) | (175,665) | (176,912)
Net operating income |  | 93,967 | 89,327 | 272,974 | 272,260
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 52,203 | 49,469 | 157,595 | 150,303
Operating expenses | [1] | (18,750) | (18,168) | (56,587) | (55,399)
Net operating income |  | 33,453 | 31,301 | 101,008 | 94,904
Operating Segments [Member] | Pennsylvania [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 39,507 | 39,996 | 118,407 | 121,313
Operating expenses | [1] | (14,004) | (13,409) | (41,286) | (41,542)
Net operating income |  | 25,503 | 26,587 | 77,121 | 79,771
Operating Segments [Member] | Metropolitan Dc [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 27,587 | 27,764 | 81,947 | 87,403
Operating expenses | [1] | (10,792) | (10,672) | (33,197) | (33,134)
Net operating income |  | 16,795 | 17,092 | 48,750 | 54,269
Operating Segments [Member] | New Jersey/ Delaware [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 11,922 | 14,975 | 37,149 | 45,440
Operating expenses | [1] | (6,594) | (7,506) | (20,857) | (23,728)
Net operating income |  | 5,328 | 7,469 | 16,292 | 21,712
Operating Segments [Member] | Richmond, Virginia [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 9,130 | 8,354 | 27,381 | 25,543
Operating expenses | [1] | (3,700) | (3,724) | (11,603) | (11,629)
Net operating income |  | 5,430 | 4,630 | 15,778 | 13,914
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [2] | 8,533 | 843 | 11,999 | 3,900
Operating expenses | [1],[2] | (2,625) | (569) | (4,993) | (2,362)
Net operating income | [2] | 5,908 | 274 | 7,006 | 1,538
Operating Segments [Member] | California |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 3,223 | 4,902 | 11,599 | 14,399
Operating expenses | [1] | (1,767) | (2,711) | (5,778) | (7,634)
Net operating income |  | 1,456 | 2,191 | 5,821 | 6,765
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 480 | 255 | 2,562 | 871
Operating expenses | [1] | (386) | (472) | (1,364) | (1,484)
Net operating income |  | $ 94 | $ (217) | $ 1,198 | $ (613)
[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% of the common interest in Broadmoor Austin Associates. See Note 3, "Real Estate Investments," for further information regarding this transaction. On April 3, 2014, the Company contributed Four Points Centre to an unconsolidated real estate venture. See Note 3, "Real Estate Investments," in notes to the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014.

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