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Disposition and Assets Held for Sale | 3 Months Ended
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Mar. 31, 2020
Discontinued Operations and Disposal Groups [Abstract] |
Disposition and Assets Held for Sale | ​ ​ 3.Disposition and Assets Held for Sale Disposition The following is a summary of disposition activity for the three months ended March 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gain on
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total | ​ | Gross | ​ | Cash | ​ | Sale of
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Square | ​ | Sales | ​ | Proceeds | ​ | Real
Date Disposed |  | Assets |  | Segment |  | Location |  | Feet |  | Price |  | from Sale |  | Estate
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (In thousands)
January 15, 2020 | ​ | Metropolitan Park (1) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,150 | ​ | $ | 154,952 | ​ | $ | 154,493 | ​ | $ | 59,477
(1) | The property, which was sold to Amazon.com ("Amazon"), was part of a like-kind exchange. See Note 5 for additional information. Total square feet represents potential development density approved by Arlington County.
Assets Held for Sale As of March 31, 2020 and December 31, 2019, we had certain real estate properties that were classified as held for sale. The amounts included in "Assets held for sale" in our balance sheets primarily represent the carrying value of real estate. The following is a summary of assets held for sale: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Liabilities
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Related to
​ | ​ | ​ | ​ | ​ | ​ | Total | ​ | Assets Held | ​ | Assets Held
Assets |  | Segment |  | Location |  | Square Feet (1) |  | for Sale |  | for Sale
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (In thousands)
March 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pen Place (2) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,080 | ​ | $ | 73,876 | ​ | $ | 213
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pen Place (2) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,080 | ​ | $ | 73,895 | ​ | $ | —
Metropolitan Park (3) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,150 | ​ | ​ | 94,517 | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | 4,230 | ​ | $ | 168,412 | ​ | $ | —
(1) | Represents estimated or approved potential development density.
(2) | In March 2019, we entered into an agreement for the sale of Pen Place for $149.9 million, subject to customary closing conditions. The sale of Pen Place to Amazon is expected to close in 2021.
(3) | As noted above, we sold Metropolitan Park to Amazon in January 2020.

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- Definition The entire disclosure for business combinations, including leverage buyout transactions (as applicable), and divestitures. This may include a description of a business combination or divestiture (or series of individually immaterial business combinations or divestitures) completed during the period, including background, timing, and assets and liabilities recognized and reclassified or sold. This element does not include fixed asset sales and plant closings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2122178 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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