In Zillow's survey of the country's 1,000 largest cities for Businessweek.com, Weston, Fla., an affluent city near Fort Lauderdale, ranked as the best-performing market, with an increase in median home value of 15.1% since February 2009. Other surprising winners: Utica, N.Y., Morristown, Tenn., and Penn Hills, Pa. Still, many markets fared far worse than average. In Homestead, Fla., a low-income Miami suburb about 50 miles from top performer Weston, the median home value fell 48.8% — the greatest drop in the country. Here are the country's five best-performing and five worst-performing housing markets since Obama took office, starting with the worst. From the desk of Eddie Cambas Miami, through MSN Real Estate.