The typical asking rate per listing is in the $20's per square foot per year. The Naples region is going through a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 8% decrease in rent.
In the last 90 days, 21 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available leases 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,950 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 1985 and are Class A.