Most listings are in the $30's per square foot per year. The Jacksonville Beach submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $32 per sqft per year.
In the last 90 days, 5 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 40% of the listings in the Jacksonville Beach are subleases, so you might be able to find a shorter term or below market rent. 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 710 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this area were built in 1985 and are Class B.