Most listings are in the $10's per square foot per year. The Sumter County region is going through a decline in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 22% decrease in rent.
In the last 90 days, 2 listings have been posted online, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,340 sqft. Most buildings in this market were built in 2006 and are Class A.