On average, listings lease in the $50's per square foot per year. The Punta Gorda submarket is going through a a rise in rates. In the last 3 months, the median rate rose $36 per sqft per year. That's a 229% rise in rent.
In the last 90 days, 7 listings have come on the market, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,300 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1990 and are Class B.