SEATTLE – November 9, 2009 -- The percent of American single-family homes with mortgages in negative equity fell to 21 percent in the third quarter, down from 23 percent in the second, as home values stabilized in the short term and more underwater homeowners lost their homes to foreclosure, according to the third quarter Zillow Real Estate Market Reports.

Year-over-year home values in the United States declined for the 11th consecutive quarter, falling 6.9 percent to a Zillow Home Value Index of $190,400. However, the rate of year-over-year decline shrank for the third quarter in a row, meaning home values did not decline as dramatically year-over-year in the third quarter as they did in the second or the first.

In addition, the Zillow Home Value Index remained relatively flat in the short term, declining 0.4 percent from the end of the second quarter to the end of the third quarter. The Zillow Home Value Index measures the value of all homes in an area, and the Q3 Zillow Real Estate Market Reports encompass 156 metropolitan statistical areas (MSAs).

Foreclosure re-sales remained high, making up more than one-fifth (21.4 percent) of all U.S. home sales in September, and made up the majority of sales in several MSAs including the Merced, Calif. MSA (74.2 percent), the Stockton, Calif. MSA (69.3 percent), the Madera, Calif. MSA (68.7 percent), the El Centro, Calif. MSA (68.1 percent) and the Las Vegas MSA (67.5 percent). Additionally, 26.9 percent of home sales nationwide sold for less than what the seller originally paid.