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The reporting person undertakes to provide to the Staff of the Securities and Exchange Commission, the Company or any shareholder of the Company, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":34568,"source":{"system":"sec-edgar","filing":"0001179110-21-006506","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021006506/edgar.xml","form_type":"4"}},{"id":2678356,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2021-06-08T20:25:35.000Z","date":"2021-06-08","kind":"sale","acquired":false,"shares":8000,"price":29.6428,"value":237142.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the weighted average of a range of sale prices per share from $29.52 to $29.705. The reporting person undertakes to provide to the Staff of the Securities and Exchange Commission, the Company or any shareholder of the Company, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":37568,"source":{"system":"sec-edgar","filing":"0001179110-21-006482","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021006482/edgar.xml","form_type":"4"}},{"id":2711252,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2021-05-17T20:44:15.000Z","date":"2021-05-13","kind":"grant","acquired":true,"shares":3416,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These restricted shares were granted as part of annual trustee compensation and will vest in one year from the grant date."}],"balance_after":45568,"source":{"system":"sec-edgar","filing":"0001179110-21-005419","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021005419/edgar.xml","form_type":"4"}},{"id":2773771,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2021-01-14","kind":"purchase","acquired":true,"shares":7.3,"price":26.07,"value":190.311,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773770,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2020-10-14","kind":"purchase","acquired":true,"shares":7.6,"price":24.52,"value":186.352,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773769,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2020-07-14","kind":"purchase","acquired":true,"shares":7.2,"price":25.91,"value":186.552,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"shares","element":"transactionShares","label":"F3","text":"The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00.  As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended.  The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773768,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2020-04-14","kind":"purchase","acquired":true,"shares":7.2,"price":25.38,"value":182.736,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"shares","element":"transactionShares","label":"F3","text":"The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00.  As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended.  The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773767,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2020-01-14","kind":"purchase","acquired":true,"shares":6.1,"price":29.71,"value":181.231,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"shares","element":"transactionShares","label":"F3","text":"The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00.  As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended.  The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773766,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2019-10-14","kind":"purchase","acquired":true,"shares":6.2,"price":28.98,"value":179.676,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"shares","element":"transactionShares","label":"F3","text":"The purchases by the reporting person on October 14, 2019, January 14, 2020, April 14, 2020 and July 14, 2020 were within six months of the sale by the reporting person on February 14, 2020 of 1,000 common shares at a price per share of $30.00.  As a result, such purchases were matchable with such sale under Section 16(b) of the Securities Exchange Act of 1934, as amended.  The reporting person has disgorged $70.71 to the issuer, representing the full amount of the profit realized in connection with such short swing transactions."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":2773765,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COPT-Common Shares","published_at":"2021-03-24T19:58:28.000Z","date":"2019-07-16","kind":"purchase","acquired":true,"shares":7,"price":26.97,"value":188.79,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares purchased by an account of which the reporting person was, at the time of purchase, a joint owner with his adult daughter.  The reporting person is no longer a joint owner of such account and thus, as of the date of this report, has no beneficial ownership interest in these shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Because the reporting person has no beneficial ownership interest in these shares as of the date of this report, these shares are not included in the total shares owned by the reporting person."}],"balance_after":42152,"source":{"system":"sec-edgar","filing":"0001179110-21-003771","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911021003771/edgar.xml","form_type":"4"}},{"id":3135930,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN 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plan."}],"balance_after":38166,"source":{"system":"sec-edgar","filing":"0001179110-19-005962","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911019005962/edgar.xml","form_type":"4"}},{"id":3716510,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2018-12-31T17:53:12.000Z","date":"2018-12-27","kind":"purchase","acquired":true,"shares":500,"price":20.8,"value":10400.0,"ownership":{"direct":true},"balance_after":34690,"source":{"system":"sec-edgar","filing":"0001179110-18-014299","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911018014299/edgar.xml","form_type":"4"}},{"id":3936050,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares (deferred)","published_at":"2018-05-14T20:11:54.000Z","date":"2018-05-10","kind":"grant","acquired":true,"shares":3458,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These deferred shares were granted as part of annual trustee compensation and will vest in one year from the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amounts are higher than previously reported as a result of dividend reinvestment plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"These shares are owned as follows:  621 shares by reporter's  daughter and 33,605 by Steven Kesler."}],"balance_after":34226,"source":{"system":"sec-edgar","filing":"0001179110-18-006717","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911018006717/edgar.xml","form_type":"4"}},{"id":4275673,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2017-06-21T19:50:36.000Z","date":"2017-06-20","kind":"sale","acquired":false,"shares":3637,"price":35.4,"value":128749.8,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Amounts are higher than previously reported as a result of dividend reinvestment plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"These shares are owned as follows:  600 shares by reporter's  daughter and 29,165 by Steven Kesler."}],"balance_after":29765,"source":{"system":"sec-edgar","filing":"0001179110-17-009367","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911017009367/edgar.xml","form_type":"4"}},{"id":4314444,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares (deferred)","published_at":"2017-05-18T19:40:50.000Z","date":"2017-05-16","kind":"grant","acquired":true,"shares":2508,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These deferred shares were granted as part of annual trustee compensation and will vest in one year from the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amounts are higher than previously reported as a result of dividend reinvestment plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"These shares are owned as follows:  600 shares by reporter's  daughter and 32,802 by Steven Kesler."}],"balance_after":33402,"source":{"system":"sec-edgar","filing":"0001179110-17-007520","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860546/000117911017007520/edgar.xml","form_type":"4"}},{"id":4559203,"issuer":{"id":4036,"kind":"organization","name":"COPT DEFENSE PROPERTIES"},"owners":[{"id":96166,"kind":"person","name":"KESLER STEVEN D","position":1,"cik":"0001073344","reported_name":"KESLER STEVEN D","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2016-11-14T19:27:48.000Z","date":"2016-11-10","kind":"sale","acquired":false,"shares":4000,"price":27.7175,"value":110870.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Amounts are higher than previously reported as a result of dividend reinvestment 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