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The latest home price data, examining October 2008 numbers, is out: Washington D.C., along with five metropolitan areas—-Atlanta, Charlotte, Detroit, Minneapolis, and Tampa—-posted their largest monthly declines ever. The steepest year-to-year decreases were in Phoenix (down 32.7%), Las Vegas (down 31.7%), San Francisco (down 31.0%), and Miami (down 29.0%), according economic research firm IHS Global Insight.