The property and address do not show up in the Naples Multiple Listing Service. I checked a few For Sale By Owner sites as well, and nothing there either. The 2007 property tax records show that the property's assessed value is $167,200. So, if the property is for sale, I would expect it to be close to that dollar value, as long as the owner understands the current real estate market.
If you can provide more information, that would be helpful. Did you see a sign on the property? Did someone tell you about it? How did you find out about the property, etc.? And are you only interested in this unit, other units in the community, or similar condos around Naples?