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Investment in Unconsolidated Real Estate Ventures - Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 26, 2018 | Jan. 05, 2018 | May 29, 2015 | Jan. 20, 2011
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method |  | $ 169,100 |  | $ 194,621 |  | $ 281,331 |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (15,231) |  | (8,306) |  | $ (11,503) |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 370,319 |  | $ 768,912 |  |  |  |  |  |
Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | [1],[2] | 50.00% |  | 50.00% |  |  |  |
Investment in Real Estate Ventures, equity method | [2] | $ 11,731 |  | $ 43,560 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (14,559) | [2] | (4,465) | [2] | $ (5,895) |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [2] | $ 26,111 |  | 93,117 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [2] | 4.65% |  |  |  |  |  |  |  |
Rockpoint Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1],[3] | 15.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method | [3] | $ 47,834 |  | 0 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [3] | 83 |  | 0 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [3] | $ 0 |  | 0 |  |  |  |  |  |
MAP Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1],[4] | 50.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method | [4] | $ 11,173 |  | 15,450 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [4] | (2,155) |  | (3,443) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [4] | $ 185,000 |  | 180,800 |  |  |  |  |  |
Debt Instrument, Interest Rate Terms | [4] | L+2.45% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year | [4] | 2023-08 |  |  |  |  |  |  |  |
Four Tower Bridge [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 65.00% | [1],[5] |  |  |  |  | 35.00% |  |
Investment in Real Estate Ventures, equity method | [5] | $ 0 |  | 3,032 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [5] | 0 |  | 746 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [5] | $ 0 |  | 9,749 |  |  |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1] | 25.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method |  | $ 1,100 |  | 1,156 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 157 |  | 175 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 3,777 |  | 4,792 |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  | L+2.65% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year |  | 2019-12 |  |  |  |  |  |  |  |
PJP Two [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1] | 30.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method |  | $ 663 |  | 604 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 179 |  | 72 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 2,214 |  | 2,564 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.12% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year |  | 2023-11 |  |  |  |  |  |  |  |
PJP VI [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1] | 25.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method |  | $ 125 |  | 179 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 71 |  | 38 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 7,069 |  | 7,370 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.08% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year |  | 2023-04 |  |  |  |  |  |  |  |
DRA Austin Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1],[6] | 50.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method | [6] | $ 0 |  | 13,972 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [6] | 1,687 |  | (989) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [6] | $ 0 |  | 249,481 |  |  |  |  |  |
Brandywine 1919 Ventures [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | [1],[7] |  |  |  | 50.00% |  |  | 50.00%
Investment in Real Estate Ventures, equity method | [7] | $ 19,897 |  | 22,268 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [7] | 253 |  | (194) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [7] | $ 88,860 |  | 88,860 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [7] | 4.00% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year | [7] | 2023-06 |  |  |  |  |  |  |  |
HSRE BDN I, LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1] | 50.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method |  | $ 0 |  | 17,671 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (358) |  | 449 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | 0 |  | 110,886 |  |  |  |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method | [8] | 0 |  | 0 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [8] | 0 |  | 99 |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [8] | $ 0 |  | 0 |  |  |  |  |  |
4040 Wilson Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | [1],[9] |  |  | 50.00% |  |  |  |
Investment in Real Estate Ventures, equity method | [9] | $ 37,371 |  | 37,179 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [9] | (192) |  | (255) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [9] | $ 57,288 |  | 6,664 |  |  |  |  |  |
Debt Instrument, Interest Rate Terms | [9] | L+2.75% |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Month and Year | [9] | 2021-12 |  |  |  |  |  |  |  |
51 N 50 Patterson [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 70.00% | [1] |  |  |  |  |  | 70.00% |
Investment in Real Estate Ventures, equity method |  | $ 21,368 |  | 21,212 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (137) |  | (176) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 0 |  | 0 |  |  |  |  |  |
Seven Tower Bridge [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage | [1],[5] | 20.00% |  |  |  |  |  |  |  |
Investment in Real Estate Ventures, equity method | [5] | $ 0 |  | 471 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [5] | 0 |  | (214) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [5] | $ 0 |  | 14,629 |  |  |  |  |  |
1250 First Street Office [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 70.00% | [1] |  |  |  |  |  | 70.00% |
Investment in Real Estate Ventures, equity method |  | $ 17,838 |  | 17,867 |  |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (260) |  | (149) |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 0 |  | $ 0 |  |  |  |  |  |
[1] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[2] | See “Brandywine - AI Venture: Station Square and 7101 Wisconsin Avenue” and “Brandywine - AI Venture: Other Than Temporary Impairment” sections below for information discussing activity that occurred during 2018 and 2017 relating to this venture.
[3] | On December 20, 2018, the Company contributed a portfolio of eight properties containing an aggregate of 1,293,197 square feet, located in its Metropolitan Washington, D.C. segment, known as the Rockpoint Portfolio, to a newly-formed joint venture, known as the Herndon Innovation Center Metro Portfolio Venture, LLC, for a gross sales price of $312.0 million. Rockpoint and the Company own 85% and 15% interests in the Herndon Innovation Center Metro Portfolio Venture, LLC, respectively. See “Herndon Innovation Center Metro Portfolio Venture, LLC” section below for further details.
[4] | On August 1, 2018, the MAP Venture refinanced its $180.8 million third party debt financing, secured by the buildings of MAP Venture and maturing February 9, 2019, with $185.0 million third party debt financing, also secured by the buildings, bearing interest at LIBOR + 2.45% capped at a total maximum interest of 6.00% and maturing on August 1, 2023.
[5] | On January 5, 2018, the Company exchanged its 20% interest in Seven Tower Bridge to acquire the remaining 35% interest in Four Tower Bridge. For further information regarding the accounting of the transaction, see “Four Tower Bridge Acquisition” section below.
[6] | See “Austin Venture” section below for information discussing the Company’s purchase of its partner’s entire 50% interest in the twelve remaining properties within the Austin Venture on December 11, 2018.
[7] | The basis difference associated with this venture is allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).
[8] | On January 31, 2017, the Company sold its 50% interest in TB-BDN Plymouth Apartments, LP.
[9] | During the fourth quarter of 2017, 4040 Wilson obtained a secured construction loan with a total borrowing capacity of $150.0 million.

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