When you are on the Residential (SF & CO Search) search screen, there are two different square footage fields:
The Estimated Total Square Feet field is based on what the list agent has entered in both the estimated heated above grade and estimated heated below grade square footage fields when they input the listing. Essentially, this is what will show in the Total Square Feet field, which is a calculated field that combines the heated/finished above and below grade square feet fields.
The Living Area Sq. Ft. (Per Public Records) field is what displays on the tax record for the property.