Standard&Poor's Ratings Services assigned its 'AA+' rating to Michigan State Housing Development Authority's (MSHDA's) series 2015A single-family mortgage revenue bonds. At the same time, Standard&Poor's affirmed its 'AA+', 'AA+/A-1+', 'AA+/A-1', and 'AA+/A-2' ratings on all parity debt issued under the authority's mortgage revenue bond program. The outlook is stable. The 'AA+' rating reflects our view of: The very strong credit quality of the mortgage loan collateral, consisting primarily of Federal Housing Administration-insured and Veterans Administration-guaranteed loans; The mortgage loans' historical performance, either consistent with or below Mortgage Bankers Assn. averages; Sufficient reserves for our forecast loan losses, commensurate with the 'AA' rating category; Very strong cash flow strength, with a current 110% asset-to-liability parity; The investments'