Three classes of Credit Suisse First Boston Mortgage Securities Corp.'s commercial mortgage pass-through certificates, series 2002-TFL1, have been downgraded by Fitch Ratings.The downgrades were as follows: class H-ALH, from BBB-minus to BB-plus; class F-WBC, from BBB-plus to BB-plus; and class G-WBC, from BBB-minus to BB-minus. The ratings on the 21 other Fitch-rated classes in the deal were affirmed. Fitch attributed the downgrades to declines in occupancy and Fitch-adjusted net cash flows at the properties backing two multifamily pools.

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