North Fork housing prices skewed higher from the shift in the mix. Median sales price jumped 16.1% to $516,250, the second highest point in seven years, second only to the prior quarter. The year-over-year increase was the sixth consecutive quarterly increase. Average sales price followed the same pattern, rising 21.1% to $697,893 from the year ago quarter. The sharp gain in price trend indicators was also observed in the luxury market, the top 10% of all sales during the quarter. Luxury median sales price surged 43.2% to $1,790,000 from the same quarter a year ago…