The Westchester county housing market experienced the second most sales activity for a second quarter in a decade. The market continued to benefit from the influx of New York City homebuyers challenged by several years of rising sales and rental prices. The number of countywide sales increased 11.5% to 2,241 compared to the prior quarter a year ago. The total number of contracts jumped 9.2% and the number of new contracts rose 9.4% respectively from the year ago quarter…