The typical asking rate per listing is in the $10's per square foot per year. The Fort Pierce submarket is going through a an increase in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 11% rise in rent.
In the last 90 days, 97 listings have come on the market, so you'll want to check back regularly for new listings. About 3% of the available space in the Fort Pierce 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 1,250 sqft. Most properties in this area are close to 1 stories. Most buildings in this region were built in 1983 and are Class B.