POWER OF ATTORNEY


Know all by these presents that Timothy Steven Johnson, does hereby make,
constitute and appoint each of Katharine A. Keenan, Leon Volchyok and Anthony F.
Marone, Jr., or any one of them, as a true and lawful attorney-in-fact of the
undersigned with full powers of substitution and revocation, for and in the
name, place and stead of the undersigned (in the undersigned's individual
capacity), to execute and deliver such forms that the undersigned may be
required to file with the U.S. Securities and Exchange Commission as a result of
the undersigned's ownership of or transactions in securities of Blackstone
Mortgage Trust, Inc. (i) pursuant to Section 16(a) of the Securities Exchange
Act of 1934, as amended, including without limitation, statements on Form 3,
Form 4, and Form 5 (including any amendments thereto) and (ii) in connection
with any applications for EDGAR access codes, including without limitation the
Form ID. The Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with regard to his
ownership of or transactions in securities of Blackstone Mortgage Trust, Inc.,
unless earlier revoked in writing. The undersigned acknowledges that Katharine
A. Keenan, Leon Volchyok and Anthony F. Marone, Jr. are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934, as amended.


By: /s/ Timothy Steven Johnson
Name: Timothy Steven Johnson

Date:  May 15, 2023