On average, listings lease in the $30's per square foot per year. The Miami-Dade County region is experiencing a a boost in rates. In the last 3 months, the median rate rose $9 per sqft per year. That's a 30% rise in rent.
In the last 90 days, 403 listings have been made available, so you'll want to check back regularly for new listings. About 4% of the office spaces 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 1,970 sqft. Most properties in this area are around 3 floors. Most buildings in this region were built in 1982 and are Class A.