The condo bubble has broken in many markets. Even rentals in Miami and other prime markets have begun to decline. In part, the rise in the dollar is now curtailing foreign investment. Likewise, I personally know some British friends who are selling property in the states to take advantage of the huge profit in the drop in the pound when converting back to the base currency.
As with every peak, developers see how condos sell so they have increased the supply right into the peak in prices. This cyclical pattern repeats over and over again. The foreign investors who got into US property back in 2011 have made a fortune in the home currency and are taking profits.