S&P Global Ratings assigned its 'AA' long-term rating to the Massachusetts Housing Finance Agency's (MassHousing) housing revenue bonds 2017 series D. At the same time, S&P Global Ratings affirmed its 'AA' long-term rating and various short-term ratings on MassHousing's main multifamily housing revenue bond resolution. The outlook is stable. The 'AA' rating reflects our view of: Extremely strong government support, reflecting ongoing support in the form of low-income housing tax credits, Federal Housing Administration (FHA) risk-share mortgage insurance, federal and state rental subsidies, property tax exemptions, and tax-exempt bond financing; MassHousing's very strong strategy and management and financial policies and practices; MassHousing's very strong loss coverage, based on the resolution's high overcollateralization; The resolution's solid financial strength, reflecting our calculation