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The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2025 by (2) the closing price of the Company's Class A Common Stock on October 15, 2025."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 92 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan."}],"balance_after":87056,"source":{"system":"sec-edgar","filing":"0001061630-25-000113","document":"wk-form4_1760733677.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163025000113/wk-form4_1760733677.xml","form_type":"4"}},{"id":1086848,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-07-17T00:22:08.000Z","date":"2025-07-15","kind":"grant","planned":false,"acquired":true,"shares":1448,"price":19.68,"value":28496.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. 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The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 13, 2023 by (2) the closing price of the Company's Class A Common Stock on January 13, 2023."}],"balance_after":50914,"source":{"system":"sec-edgar","filing":"0001209191-23-003574","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919123003574/doc4.xml","form_type":"4"}},{"id":2135789,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-10-18T21:41:48.000Z","date":"2022-10-14","kind":"grant","acquired":true,"shares":1077,"price":22.32,"value":24038.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 14, 2022 by (2) the closing price of the Company's Class A Common Stock on October 14, 2022."}],"balance_after":49856,"source":{"system":"sec-edgar","filing":"0001209191-22-053990","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122053990/doc4.xml","form_type":"4"}},{"id":2206437,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-07-18T23:20:27.000Z","date":"2022-07-15","kind":"grant","acquired":true,"shares":824,"price":28.57,"value":23541.68,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2022 by (2) the closing price of the Company's Class A Common Stock on July 15, 2022."}],"balance_after":48779,"source":{"system":"sec-edgar","filing":"0001209191-22-042477","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122042477/doc4.xml","form_type":"4"}},{"id":2223281,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-06-23T23:07:56.000Z","date":"2022-06-21","kind":"purchase","acquired":true,"shares":5000,"price":27.7844,"value":138922.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $27.7550 to $27.8050, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4."}],"balance_after":47955,"source":{"system":"sec-edgar","filing":"0001209191-22-039056","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122039056/doc4.xml","form_type":"4"}},{"id":2225972,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-06-21T23:59:04.000Z","date":"2022-06-16","kind":"grant","acquired":true,"shares":4399,"price":26.14,"value":114989.86,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 16, 2022. The award vests in full on the date of the Company's 2023 annual meeting, subject to the director's continued services as of the date of the 2023 annual meeting."}],"balance_after":42955,"source":{"system":"sec-edgar","filing":"0001209191-22-038551","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122038551/doc4.xml","form_type":"4"}},{"id":2295884,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-04-19T00:21:31.000Z","date":"2022-04-14","kind":"grant","acquired":true,"shares":639,"price":31.94,"value":20409.66,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 14, 2022 by (2) the closing price of the Company's Class A Common Stock on April 14, 2022."}],"balance_after":38556,"source":{"system":"sec-edgar","filing":"0001209191-22-024649","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122024649/doc4.xml","form_type":"4"}},{"id":2432753,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2022-01-19T23:19:13.000Z","date":"2022-01-14","kind":"grant","acquired":true,"shares":627,"price":31.91,"value":20007.57,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 14, 2022 by (2) the closing price of the Company's Class A Common Stock on January 14, 2022."}],"balance_after":37917,"source":{"system":"sec-edgar","filing":"0001209191-22-003798","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919122003798/doc4.xml","form_type":"4"}},{"id":2540875,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-10-19T00:45:24.000Z","date":"2021-10-15","kind":"grant","acquired":true,"shares":610,"price":32.18,"value":19629.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2021 by (2) the closing price of the Company's Class A Common Stock on October 15, 2021."}],"balance_after":37290,"source":{"system":"sec-edgar","filing":"0001209191-21-060790","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121060790/doc4.xml","form_type":"4"}},{"id":2626361,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-07-23T22:21:32.000Z","date":"2021-07-21","kind":"grant","acquired":true,"shares":3677,"price":31.27,"value":114979.79,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a\none-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated\nby dividing $115,000 in retainer and meeting fees by the closing price for July 21, 2021."}],"balance_after":36680,"source":{"system":"sec-edgar","filing":"0001209191-21-048019","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121048019/doc4.xml","form_type":"4"}},{"id":2630941,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-07-20T00:59:59.000Z","date":"2021-07-15","kind":"grant","acquired":true,"shares":550,"price":30.95,"value":17022.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which\nconvert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1)\nthe product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class\nA Common Stock dividend paid by the Company on July 15, 2021 by (2) the closing price of the Company's Class A Common Stock on July 15,\n2021."}],"balance_after":33003,"source":{"system":"sec-edgar","filing":"0001209191-21-047302","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121047302/doc4.xml","form_type":"4"}},{"id":2645657,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-07-02T22:25:57.000Z","date":"2021-06-30","kind":"grant","acquired":true,"shares":777,"price":32.19,"value":25011.63,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a\none-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated\nby dividing $25,000 in retainer and meeting fees by the average adjusted closing price for the second quarter of 2021."}],"balance_after":32453,"source":{"system":"sec-edgar","filing":"0001209191-21-045166","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121045166/doc4.xml","form_type":"4"}},{"id":2745830,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-04-20T00:37:52.000Z","date":"2021-04-15","kind":"grant","acquired":true,"shares":498,"price":32.59,"value":16229.82,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 15, 2021 by (2) the closing price of the Company's Class A Common Stock on April 15, 2021."}],"balance_after":31676,"source":{"system":"sec-edgar","filing":"0001209191-21-027447","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121027447/doc4.xml","form_type":"4"}},{"id":2762221,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-04-02T23:01:57.000Z","date":"2021-03-31","kind":"grant","acquired":true,"shares":861,"price":29.04,"value":25003.44,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. 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The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.62 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 15, 2021 by (2) the closing price of the Company's Class A Common Stock on January 15, 2021."}],"balance_after":30317,"source":{"system":"sec-edgar","filing":"0001209191-21-004144","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000120919121004144/doc4.xml","form_type":"4"}},{"id":2926094,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2021-01-05T01:51:05.000Z","date":"2020-12-31","kind":"grant","acquired":true,"shares":991,"price":25.24,"value":25012.84,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. 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