The typical asking rate per listing is in the $20's per square foot per year. The Naples submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 10% rise in rent.
In the last 90 days, 25 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 4% of the available space in the Naples are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,360 sqft. Most buildings in this area are close to 2 stories. Most buildings in this region were built in 1985 and are Class A.