The typical asking rate per listing is in the $20's per square foot per year. The St. Lucie County submarket is going through a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 6% increase in rent.
In the last 90 days, 223 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the listings in the St. Lucie County are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,170 sqft. Most properties in this market are around 1 floors. Most buildings in this area were built in 1995 and are Class B.