Founder of Land Services Inc and Founder of Florida Land Consulting.
Know before you buy! Assisting clients with feasibility studies of property site prior to development.
Permitting and mitigation assistance.
Land planning assistance.
In my experience, this data has been at no cost. Most property appraiser sites offer sales data as an excel file for download. Each property can be looked at with exterior photos, or base floor plans.
It would take quite alot of dara entry to input into a program, the issue would be the accuracy, if properties change hands within a year.
Hope this helps!