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Assets Held for Sale (Tables) | 3 Months Ended
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Mar. 31, 2021
Assets Held for Sale |
Summary of assets held for sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Liabilities Related
​ | ​ | ​ | ​ | ​ | ​ | Total | ​ | Assets Held | ​ | to Assets Held
Assets |  | Segment |  | Location |  | Square Feet (1) |  | for Sale |  | for Sale
​ | ​ | ​ | ​ | ​ | ​ | (In thousands)
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pen Place (2) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,082 | ​ | $ | 73,876 | ​ | $ | 213
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pen Place (2) | ​ | Other | ​ | Arlington, Virginia | ​ | 2,082 | ​ | $ | 73,876 | ​ | $ | —
(1) | Represents estimated or approved potential development density.
(2) | In March 2019, we entered into an agreement for the sale of Pen Place to Amazon, which we expect to close in 2021.

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- Definition Tabular disclosure of long lived assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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