 NEW YORK--BUSINESS WIRE--Blackstone Mortgage Trust, Inc. NYSE:BXMT the Company today announced it has commenced a private offering of 400 million in aggregate principal amount of its senior secured notes due 2027 the Notes. The Notes will be fully and unconditionally guaranteed on an unsubordinated secured basis by each wholly owned subsidiary of the Company that is a domestic subsidiary or that guarantees or becomes a borrower under the Companys Term Loan Credit Agreement and aft 