Existing home sales including single-family houses, townhouses, condos, and co-ops posted a decline in September according to data released today by the National Association of Realtors ® . Sales of all property types were down 3.0 percent on a seasonally adjusted basis to an annual rate of 4.91 million in September from an upwardly revised (from 5.03 million) figure of 5.06 in August. Despite the drop, sales were still well above the 4.41 million annual pace in September 2010 when the market...