CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed four classes of Credit Suisse First Boston Mortgage Securities Corp. (CSFB) commercial mortgage pass-through certificates series 1999-C1. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The affirmation of class G reflects defeased collateral, which is sufficient to pay off the class. The class was not upgraded due to the possibility that losses from the one specially serviced loan could cause sig


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