Standard&Poor's Ratings Services has raised its long-term rating on Michigan State Housing Development Authority's single-family mortgage revenue bonds series 1997C, 1997D, and 1997E to 'AA+' from 'A' and assigned a stable outlook. The previous rating of 'A' with a negative outlook was assigned on Nov. 19, 2008, and was based on the bond insurance that is provided by Ambac. The upgrade is based on Standard&Poor's assignment of its 'AA+' underlying rating (SPUR) to the bonds, which is based on the rating of the parity resolution, which is currently 'AA+'. (For a full description of the 'AA+' rating please see the article published on Dec. 13, 2007, on RatingsDirect.) The stable outlook reflects the current strong financial