The Corcoran Group-PropertyShark report here (PDF). Approximately 60 percent annual drop in sales.
The Prudential Douglas Elliman-Miller Samuel report here (PDF). Median re-sale price drops over 20 percent annually.
The Halstead Property-Brown Harris Stevens report here (PDF). An 87 percent annual drop in closings over $10 million.
The StreetEasy report here (PDF). Number of closings drops over 47 percent quarterly.