Fitch Ratings has assigned an ‘AA-‘ rating to the $117 million Massachusetts Housing Finance Agency’s (HFA, or MassHousing) housing bonds 2013 series B.

The bonds are expected to be sold the week of May 6, 2013 and close on or about May 15, 2013.

Fitch also affirmed the ‘AA-‘ underlying rating on the $1.7 billion of parity housing bonds outstanding under the general resolution as of Dec. 31, 2012.

The rating outlook for the bonds is Stable.