On average, listings lease in the $20's per square foot per year. The Naples region is going through a an increase in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 19% increase in rent.
In the last 90 days, 47 listings have been made available, so you'll want to check back regularly for new listings. About 4% of the available space in the Naples are subleases, so you will probably have to focus your search on direct office leases. 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 1,470 sqft. Most buildings in this market are around 2 stories. Most buildings in this region were built in 1985 and are Class A.