Building footprints were determined by using the building Total Gross Area for each property, as recorded by the Hillsborough County Property Appraiser. Find total gross area Follow these steps: Use the Hillsborough County Property Appraiser Property Search Tool (use full site on a laptop or desktop computer, not a mobile device)  Search by Address in the Basic Property Search box Select Parcel Result tab Scroll to the Building Sub Areas section for the Total Gross Area