CHICAGO--(BUSINESS WIRE)--Fitch Ratings withdraws 20 distressed classes in three small-balance U.S. commercial mortgage-backed securities (CMBS) transactions. KEY RATING DRIVERS The ratings withdrawals are on classes currently rated 'Csf' or 'Dsf', which reflects the fact that realized losses are considered either inevitable or have already been incurred. The withdrawals are as the result of the lack of relevancy of the ratings on these transactions, as well as lack of investor interest. The ra