On average, listings lease in the $10's per square foot per year. The Sebastian region is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 3 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 67% of the available leases in the Sebastian are subleases, so you might be able to snag a great spot on a short term. 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 1,060 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1983 and are Class B.