OREANDA-NEWS. Fitch Ratings affirms Credit Suisse First Boston Mortgage Securities Corp. (CSMC), series 2010-RR6 as follows:

--\$9.05 million* class B-A at 'AAAsf'; Outlook Stable.

*Exchangeable REMIC certificates

Classes A, A-A and A-B are paid in full. Fitch does not rate classes B and B-B.

KEY RATING DRIVERS

This transaction is a resecuritization of the ownership interest in two commercial mortgage-backed certificates, classes A-2 and A-2FX, from Morgan Stanley Capital I Trust (MSCI) commercial mortgage pass-through certificates series 2007-HQ12, which were affirmed by Fitch at 'AAAsf';Outlook Stable on Feb. 18, 2015. The exchangeable class B-B has sufficient credit enhancement as the underlying MSCI 2007-HQ12 bonds currently have approximately 49% credit enhancement.

RATING SENSITIVITIES

The underlying bonds have Stable Outlooks, and no future rating actions are expected. The Outlook on class B-A is also expected to remain Stable as the underlying MSCI 2007-HQ12 classes delever.

The transaction consists of one re-REMIC bond group backed by the interest in two underlying super-senior bonds from the same transaction. The bond group is split into one senior and one support class of certificates. Principal and interest from the underlying commercial mortgage-backed certificates is applied sequentially while losses from the underlying commercial mortgage-backed certificates are applied in reverse sequential order. Credit enhancement for each class is provided by the structural support of the underlying transaction and the respective subordinate classes in the resecuritization.