NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) is pleased to announce the assignment of preliminary ratings to 16 classes of UBS 2018-C15 (see ratings list below), a $646.5 million CMBS conduit transaction collateralized by 41 commercial mortgage loans secured by 317 properties. The collateral properties are located in 37 states, with two states, Texas (19.5%) and California (10.6%), representing more than 10.0% of the pool balance. The pool has exposure to all of the major property