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Properties, Net | 12 Months Ended
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Dec. 31, 2020
Real Estate [Abstract] |
Properties, Net | Properties, Net Operating properties, net consisted of the following (in thousands):
| December 31,
| 2020 |  | 2019
Land | $ | 528,269 |  |  | $ | 472,976 |
Buildings and improvements | 3,711,264 |  |  | 3,306,791 |
Less: Accumulated depreciation | (1,124,253) |  |  | (1,007,120) |
Operating properties, net | $ | 3,115,280 |  |  | $ | 2,772,647 |
2020 Dispositions On October 30, 2020, we sold a 90% interest in two data center shell properties in Northern Virginia based on an aggregate property value of $89.7 million and retained a 10% interest in the properties through B RE COPT DC JV II LLC (“B RE COPT”), a newly-formed joint venture. Our partner in the joint venture acquired the 90% interest from us for $80.7 million. We account for our interest in the joint venture using the equity method of accounting as described further in Note 6. We recognized a gain on sale of $30.0 million. 2020 Development Activities In 2020, we placed into service 1.8 million square feet in 11 newly-developed properties, 42,000 square feet in expansions of three fully-operational properties and 21,000 square feet in a redeveloped property. As of December 31, 2020, we had 11 properties under development, including three partially-operational properties, that we estimate will total 1.5 million square feet upon completion. In the third quarter of 2020, we concluded that we no longer expected to develop a property in Baltimore, Maryland. As a result, we recognized an impairment loss on previously incurred pre-development costs of $1.5 million. 2019 Dispositions In 2019, we sold, through a series of transactions, a 90% interest in nine data center shells in Northern Virginia based on an aggregate property value of $345.1 million, retaining a 10% interest in the properties through BREIT COPT DC JV LLC (“BREIT-COPT”), a newly-formed joint venture. The transactions for seven of these properties were completed on June 20, 2019 and the remaining two properties on December 5, 2019. Our partner in the joint venture acquired the 90% interest from us for $310.6 million. We account for our interest in the joint venture using the equity method of accounting as described further in Note 6. We recognized a gain on sale of $105.2 million. 2019 Development Activities In 2019, we placed into service 1.1 million square feet in nine newly-developed properties and 85,000 square feet in one property under redevelopment. 2018 Dispositions In 2018, we sold 11751 Meadowville Lane, an operating property totaling 193,000 square feet in Chester, Virginia (in our Data Center Shells sub-segment). We contractually closed on the sale of this property on October 27, 2017 for $44.0 million. We provided a financial guaranty to the buyer under which we provided an indemnification for up to $20 million in losses it could incur related to a potential defined capital event occurring on the property; our financial guaranty to the buyer expired on October 1, 2018, resulting in no losses to us. We accounted for this transaction as a financing arrangement. Accordingly, we did not recognize the sale of this property for accounting purposes until the expiration of the guaranty on October 1, 2018. In the fourth quarter of 2018, we recognized a gain on this sale of $1.5 million. 2018 Development Activities In 2018, we placed into service 666,000 square feet in six newly-developed properties, 22,000 square feet in one redeveloped property and land under a long-term contract. In the fourth quarter of 2018, we abandoned plans to redevelop a property in our Fort Meade/BW Corridor sub-segment after we completed leasing on the property that did not require any redevelopment. Accordingly, we recognized an impairment loss of $2.4 million representing pre-development costs associated with the property.

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- Definition The entire disclosure for certain real estate investment financial statements, real estate investment trust operating support agreements, real estate owned, retail land sales, time share transactions, as well as other real estate related disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -URI http://asc.fasb.org/topic&trid=2156125 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 978 -URI http://asc.fasb.org/topic&trid=2134977 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 976 -URI http://asc.fasb.org/topic&trid=2134846 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -URI http://asc.fasb.org/topic&trid=2156429 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 972 -URI http://asc.fasb.org/topic&trid=2134617 + Details
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