Most listings are in the $40's per square foot per year. The Miami-Dade County submarket is going through a an increase in rates. In the last 3 months, the median rate increased $7 per sqft per year. That's a 17% increase in rent.
In the last 90 days, 478 listings have been posted online, 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 have to consider a longer term lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,230 sqft. Most buildings in this market are approximately 3 stories. Most buildings in this market were built in 1982 and are Class A.