Merrill Lynch Puttable FLOATs/RITES Trust (Freddie Mac) puttable floating option tax-exempt receipts series MT-217, relating to Collin County Housing Finance Corp. multifamily housing mortgage revenue bonds (Carpenter-Oxford Development) series 1998, are rated 'AAA/A-1+'. The long-term component of the rating is based on the Freddie Mac credit facility. The short-term component of the rating is based on a Freddie Mac liquidity facility. The expiration date of the liquidity facility is Oct. 1, 2015.