House prices in 20 U.S. cities declined in the year that ended on Sept. 30 at the fastest pace on record as rising foreclosures pushed down property values.

The S&P/Case-Shiller home-price index dropped 17.4% in September from a year earlier, more than forecast, after a 16.6% decline in August. The gauge has fallen every month since January 2007. (It is published by Standard & Poor's Corp., Fiserv Inc. and MacroMarkets LLC.)

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