Most listings are in the $20's per square foot per year. The Port Charlotte region is going through a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 21% increase in rent.
In the last 90 days, 9 listings have been posted online, which means new availabilities 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,740 sqft. Most buildings in this market are around 1 floors. Most buildings in this area were built in 1983 and are Class B.