On average, listings lease in the $10's per square foot per year. The Destin submarket is going through a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 14% decline in rent.
In the last 90 days, 3 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 300% of the listings in the Destin are subleases, so you might be able to find a shorter term or below market rent. 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 610 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 1996 and are Class A.