Miami Florida office vacancy rate has dropped to 16.8 percent, its the lowest mark in two years, This number represents a fall from 18.6 percent at the end of the first quarter, and the lowest vacancy rate since 2009, when it was 16.1 percent. Class A vacancy rate fell to 18.2 percent, down from 20.6 percent at the end of the first quarter. There have been a total of 1.4 million square feet of new leases this year, a 4.6 percent increase from the 1.2 million square feet of leasing at the same time last year. Asking rents have remained unchanged at $30. per square foot, a slight increase from $29.90 per square foot.