The typical asking rate per listing is in the $30's per square foot per year. The Miami-Dade County region is going through a decline in rates. In the last 3 months, the median rate fell $9 per sqft per year. That's a 22% decrease in rent.
In the last 90 days, 362 listings have been listed, so you'll want to check back regularly for new listings. About 4% of the available leases in the Miami-Dade County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,910 sqft. Most buildings in this market are approximately 3 stories. Most buildings in this area were built in 1982 and are Class A.