Certain 5.25% Convertible Senior Notes due 2018 of Blackstone Mortgage Trust, Inc. are subject to a Lock-Up Agreement Ending on 14-JAN-2018. These 5.25% Convertible Senior Notes due 2018 will be under lockup for 45 days starting from 30-NOV-2017 to 14-JAN-2018. Details: The executive officers and directors, Blackstone Holdings III L.P., and BXMT Advisors L.L.C., have agreed that they will not dispose of or hedge any shares of class A Common Stock or any securities convertible into or exchangeable for our class A Common Stock, for a period of 45 days from the date of the final prospectus supplement without the prior written consent of Citigroup Global Markets Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Barclays Capital Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, and Wells Fargo Securities, LLC.