...S&P Global Ratings assigned its '##+' long-term rating to Massachusetts Housing Finance Agency's (MassHousing) roughly $58.9 million series 224 (nonalternative-minimum-tax; social bonds) single-family housing revenue bonds (SFHRB) from within its single-family housing revenue bond program, and affirmed its ratings on the SFHRB's existing debt. The outlook on the long-term ratings is stable. MassHousing will use series 224 bond proceeds to replace and refund certain bonds outstanding under the resolution, to optionally redeem $20 million of the series 2021 SFHRB notes, and to finance the purchase of approximately $19 million of mortgage-backed securities (MBS), and $39 million whole-mortgage loans as well as fund $1.7 million of down payment assistance for borrowers. Series 224 bonds are fixed-rate debt, partially subject to optional and special redemption, as set forth in the official statement....