Real Estate News Average U.S. 30-year mortgage rate slips to 4.23% March 23, 2017 Michael Burke 0 Comment SWFL City Guide Freddie Mac: Long-term mortgage rates are down from their highest levels of 2017. Last week, the 30-year FRM was 4.30%; the 15-year FRM was 3.50% and now is 3.44%. Source: Florida Realtors