FILE-This Tuesday, Aug. 21, 2012, photo, shows an exterior view of house 

FILE-This Tuesday, Aug. 21, 2012, photo, shows an exterior view of house with a pending home sale sign in Palo Alto, Calif. The number of Americans who signed contracts to buy previously occupied homes fell in August from a two-year high in July. The National Association of Realtors says its index of sales agreements dropped 2.6 percent last month to 99.2. In July, the index rose to 101.9. That was the highest level since April 2010, when the market benefited from a federal home-buying tax credit. (AP Photo/Paul Sakuma, File)
Associated Press
FILE-This Tuesday, Aug. 21, 2012, photo, shows an exterior view of house with a pending home sale sign in Palo Alto, Calif. The number of Americans who signed contracts to buy previously occupied homes fell in August from a two-year high in July. The National Association of Realtors says its index of sales agreements dropped 2.6 percent last month to 99.2. In July, the index rose to 101.9. That was the highest level since April 2010, when the market benefited from a federal home-buying tax credit. (AP Photo/Paul Sakuma, File)
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