CHICAGO–(BUSINESS WIRE)–Fitch Ratings has assigned ratings to the Morgan Stanley Capital I Trust 2016-UBS12 commercial mortgage pass-through certificates. KEY RATING DRIVERS Concentrated Pool by Loan Size: The top 10 loans comprise 62.4% of the pool, which is worse than the 2015 and year-to-date (YTD) 2016 averages of 49.3% and 54.5%, respectively. The pool’s loan concentration index (LCI) is 507, which is above the 2015 and YTD 2016 averages of 367 and 418, respectively. For this transaction