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Sales of both new construction and existing homes are on pace to for their best year since 2007, and the accompanying purchase mortgage activity needed to facilitate this year's transactions is now forecasted to jump 25% from last year, to $801 billion. From sun-soaked Phoenix to the frosty Twin Cities, here's a look at the 10 markets with the biggest year-over-year percent increases in home sales. The data, from RealtyTrac, is based on metropolitan statistical areas with more than 10,000 home sales in the first half of 2015.