Heavy sales volume and price growth continued in the Long Island housing market, excluding The Hamptons and North Fork. The final quarter of 2017 saw the most fourth-quarter sales in thirteen years, completing three full years of year quarterly sales growth. There were 7,264 sales, up 3.7% from the prior-year quarter. In addition to rising sales, listing inventory declined year over year for the eleventh time in the past twelve quarters. There were 10,273 listings at the end…