Westchester continues to be characterized by high sales volume and chronically low inventory. The market remained tightest in the entry-level and weakest at the top. The number of residential sales jumped 18.2% to 2,648 from the year ago quarter, the highest second quarter total recorded since at least 1982. Single family sales expanded 10.5% to 1,627; 2-4 Family sales rose 18.9% to 145; Co-op sales surged 70% to 522; Condo sales increased 4.1% to 354 respectively over the same period. Listing inventory continued to fall, keeping the overall pace of the market brisk. There were 4,431 listings of all property types at…