According to data from the Miami Association of Realtors, Miami-Dade's total sales decreased 13.2 percent year-over-year in June, from 2,364 to 2,051. Miami single-family sales declined 3.8 percent year-over-year, from 1,004 to 966. And existing condo sales decreased by 20.2 percent year-over-year, from 1,360 to 1,085.