Manhattan apartment prices fell for a second consecutive quarter, helping drive the biggest gain in sales in more than 13 years as buyers seized on discounts.

The median price slid 8.4% to $850,000 in the third quarter from a year earlier, the New York appraisal firm Miller Samuel Inc. and brokerage Prudential Douglas Elliman Real Estate said Friday.

The number of sales jumped 46% from the second quarter, the biggest third-quarter increase since 1996.

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