Existing-home sales fell 9.6 percent in February percent to a seasonally adjusted annual rate of 4.88 million, from an upwardly revised 5.40 million in January, NAR says. The sales rate is 2.8 percent below this time last year. “Housing affordability conditions have been at record levels and the economy has been improving, but home sales are being constrained by the problems of unnecessarily tight credit and continuing appraisal problems,” NAR Chief Economist Lawrence Yun says.