NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded six classes and affirmed 12 classes of Bear Stearns Commercial Mortgage Securities Trust (BSCMS) commercial mortgage pass-through certificates series 2005-Top20. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The upgrades are due to an increase in credit enhancement from paydown and the expectation that the transaction will continue to delever as maturing loans repay. Fitch modeled losses of 3.


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