Washington -- June 23, 2009 -- Sales of existing homes showed another gain in May, benefiting from favorable affordability conditions and a first-time buyer tax credit, according to the National Association of Realtors. May’s increase was the first back-to-back monthly gain since September 2005.

Existing-home sales – including single-family, townhomes, condominiums and co-ops – rose 2.4 percent to a seasonally adjusted annual rate1 of 4.77 million units in May from a downwardly revised level of 4.66 million units in April, but remained 3.6 percent below the 4.95 million-unit pace in May 2008.

Lawrence Yun, NAR chief economist, expected an improvement. “Historically low mortgage interest rates clearly drew buyers into the market, and housing remains very affordable even with a recent uptick in rates,” he said. “First-time buyers also are being drawn off the sidelines by the $8,000 tax credit, which is helping to absorb inventory. However, the increase in sales is less than expected because poor appraisals are stalling transactions. Pending home sales indicated much stronger activity, but some contracts are falling through from faulty valuations that keep buyers from getting a loan.”

According to Freddie Mac, the national average commitment rate for a 30-year, conventional, fixed-rate mortgage edged up to 4.86 percent in May from a record low 4.81 percent in April; the rate was 6.04 percent in May 2008. Last week, Freddie Mac reported the 30-year fixed at 5.38 percent; data collection began in 1971.