The typical asking rate per listing is in the $10's per square foot per year. The Sebastian submarket is going through a an increase in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 3 listings have been posted online, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 33% of the office spaces in the Sebastian 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,060 sqft. Most properties in this market are close to 2 stories. Most buildings in this market were built in 1983 and are Class B.