NEW YORK–(BUSINESS WIRE)–Fitch Ratings upgrades three classes and affirms one class of Merrill Lynch Mortgage Trust (MLMT) 2004-MKB1 commercial mortgage pass-through certificates. A detailed list of rating actions follows at the end of this release. KEY RATING DRIVERS The upgrades are the result of increasing credit enhancement from continued paydown, stable performance of the underlying collateral high percentage of loans structured with full amortization (50.8%), and greater likelihood of c
