...S&P Global Ratings assigned its '##+' long-term rating to the Pennsylvania Housing Finance Agency's (PHFA) approximately $253.6 million series 2021-137 (Non-AMT) social bonds. At the same time, S&P Global Ratings affirmed its '##+' long-term rating and underlying rating (SPUR) and its '##+/A-1' and '##+/A-1+' dual ratings on PHFA's previously issued debt under the single-family mortgage revenue bond resolution (the single-family resolution). The outlook is stable. The 2021-137 bond proceeds will be used to finance the purchase of new mortgage loans and down-payment and closing assistance loans for single-family low- and moderate-income residences, and pay issuance costs. The bonds will bear interest--payable semiannually on Oct. 1 and April 1, starting April. 1, 2022--at fixed rates until maturity, subject to redemption as described in the official statements. PHFA established the bond indenture in 1982, and as of June 30, 2021, it had purchased a total of 151,116 first-lien mortgage loans...