Exhibit 24.1

                               POWER OF ATTORNEY

Know all by these presents that Randall S. Rothschild, does hereby make,
constitute and appoint each of Stephen D. Plavin 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.
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). 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 Stephen D. Plavin 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.

                                       By:   /s/ Randall S. Rothschild
                                             ----------------------------------
                                             Randall S. Rothschild

                                       Date: September 26, 2013