what is the legal sq footage of the home in the tax records? What is listed in Trulia is taken from the MLS feed, but the MLS feed has rules on what can be counted. For example in the st louis area, we don't count basements or garages or anything that is below ground level in the case of split level homes. Other parts of the country do count those areas. In addition, in homes that are 1.5 story vs 2 story, the area on the second floor that does not have a floor is not counted (ie you can't just double the sq ft for the first floor and count it. If you have steep ceilings, the area at the side of the room that is less than a certain height (about 5') isn't counted because you can't stand up in that area.