Most listings are in the $30's per square foot per year. The Jacksonville Beach region is experiencing a a boost in rates. In the last 3 months, the median rate increased $32 per sqft per year.
In the last 90 days, 5 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 40% of the available space in the Jacksonville Beach 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.
The standard measurement for office space in this area is around 710 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1985 and are Class B.