NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) is pleased to announce the assignment of preliminary ratings to six classes of Atrium Hotel Portfolio Trust 2017-ATRM, a $600.0 million CMBS single-borrower transaction. The collateral for the securitization consists of a $600.0 million non-recourse, first lien, floating-rate mortgage loan that is secured by the borrower’s fee simple interest in 26 hotels totaling 6,228 keys, the fee simple/leasehold interest in one hotel totaling 234 k