Exhibit 24.1

                               POWER OF ATTORNEY

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

                                       Date: September 26, 2013