On average, listings lease in the $20's per square foot per year. The Casselberry region is going through a a boost in rates. In the last 3 months, the median rate increased $21 per sqft per year.
In the last 90 days, 10 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 80% of the listings in the Casselberry 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 16,500 sqft, there are still 0 listings below 2,000 sqft. Most properties in this market are approximately 1 stories. Most buildings in this region were built in 1986 and are Class B.