The key mortgage rate had its biggest one-week decline of the year, falling to the lowest level in 15 months. Real Estate and Housing (Residential), Mortgages, Interest Rates, Government Bonds, United States Economy, Credit and Debt, Federal Home Loan Mortgage Corp (Freddie Mac) The key mortgage rate had its biggest one-week decline of the year, falling to the lowest level in 15 months. NYT > Business