Most listings are in the $20's per square foot per year. The St. Johns County region is going through a a rise in rates. In the last 3 months, the median rate went up $23 per sqft per year.
In the last 90 days, 9 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 233% of the office spaces in the St. Johns County 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 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 1,960 sqft. Most buildings in this area are close to 2 floors. Most buildings in this area were built in 1992 and are Class A.