Most listings are in the $20's per square foot per year. The Brandon submarket is going through a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 18% rise in rent.
In the last 90 days, 17 listings have been made available, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About 12% of the office spaces in the Brandon are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 5,900 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this area are around 1 stories. Most buildings in this area were built in 1986 and are Class B.