In a broad swath of 37 south suburbs from Burbank to Steger, median prices for existing single-family homes and condominiums last year remained at least 40 percent below where they were in 2005, after inflation, according to data collected by housing research firm Metrostudy. In Markham, the south suburbs' worst affected town, the median price has fallen 68 percent over the last decade to just $44,000, while in Calumet City, Blue Island, Riverdale and Steger the median price has fallen by more than 60 percent. The median price means half the homes were sold for more and half for less.