Property values were growing at the start of 2017. New numbers from Broward and Miami-Dade show various paces of expansion, with Broward posting stronger numbers than Miami-Dade. New construction plays a big role: While growth is slowing in Miami-Dade, more than $8 billion in new construction gave the county an overall growth rate topping 8 percent. In Broward, values are up 9 percent.