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Segment Information Summary of Unconsolidated Real Estate Ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 211,771 |  | $ 211,771 |  | $ 225,004
Equity in loss of Real Estate Ventures |  | (1,093) | $ (486) | (1,835) | $ (733) |
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | 211,771 |  | 211,771 |  | 225,004
Equity in loss of Real Estate Ventures |  | (1,093) | (486) | (1,835) | (733) |
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [1] | 43,236 |  | 43,236 |  | 27,137
Equity in loss of Real Estate Ventures | [1] | (186) | 32 | (636) | 13 |
Operating Segments [Member] | Pennsylvania [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | 16,796 |  | 16,796 |  | 17,385
Equity in loss of Real Estate Ventures |  | (120) | (578) | (142) | (937) |
Operating Segments [Member] | Metropolitan Dc [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [2] | 113,222 |  | 113,222 |  | 73,127
Equity in loss of Real Estate Ventures | [2] | (343) | (142) | (572) | (117) |
Operating Segments [Member] | New Jersey/ Delaware [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | 0 |  | 0 |  | 0
Equity in loss of Real Estate Ventures |  | 67 | 82 | 231 | 204 |
Operating Segments [Member] | Richmond, Virginia [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | 1,512 |  | 1,512 |  | 1,574
Equity in loss of Real Estate Ventures |  | 106 | 184 | 438 | 253 |
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [3],[4] | 37,005 |  | 37,005 |  | $ 105,781
Equity in loss of Real Estate Ventures | [3],[4] | $ (617) | $ (64) | $ (1,154) | $ (149) |
[1] | evo at Cira was placed into service during the third quarter ended September 30, 2014.
[2] | Investment in real estate ventures as of September 30, 2015 includes the JBG Ventures, which were formed on May 29, 2015
[3] | Investment in real estate ventures does not include the $1.1 million and $1.2 million negative investment balance in one real estate venture as of September 30, 2015 and December 31, 2014, respectively, which is included in other liabilities.
[4] | On June 22, 2015 the Company acquired the remaining 50.0% of the common interest in Broadmoor Austin Associates. As such, equity method investment at June 30, 2015 related to the Austin Venture only. See Note 3, "Real Estate Investments," for further information regarding the purchase of Broadmoor Austin Associates.

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