Real estate values around the nation have collapsed, and sales of foreclosed and “underwater” homes now dominate many housing markets, according to a report released Tuesday.

The report, from Zillow.com, a real estate Web site, revealed that with foreclosures soaring, nearly 20% of the nation’s home sales in 2008 were of bank-repossessed properties. Another 11% were short sales, in which homeowners owed more in mortgage debt than their homes were worth.

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