The typical asking rate per listing is in the $40's per square foot per year. The Miami-Dade County region is experiencing a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 11% decline in rent.
In the last 90 days, 467 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the office spaces 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 1,990 sqft. Most buildings in this region are close to 3 floors. Most buildings in this region were built in 1982 and are Class A.