CHICAGO--(BUSINESS WIRE)--Fitch Ratings has upgraded one class and affirmed three classes of Freddie Mac 2011-K15 multifamily mortgage pass-through certificates along with three classes of Freddie Mac structured pass-through certificates, K-015. A detailed list of rating actions follows at the end of this release. KEY RATING DRIVERS The upgrade of the Freddie Mac 2011-K15 is based on the improved performance of the underlying collateral pool along with increased credit enhancement through princ
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