I thought I had a good candidate but after a drive-by and some study, I found it very annoyingly exagerated. first the house is on a very wide, but not very deep lot, so there's almost no back yard but a huge side yard. Secondly the house claims to be Sq.Ft. of 2,200. If you add up the rooms listed however, you get a total of 1227 and I'm pretty sure from looking at the pictures that they double counted a space, so it's actually 1128. If you add up the rooms in my house (which was listed at 1800 sq.ft. but has a public record of 1,475 you get 1104. Neither numbers here include the bathrooms. 2200 seems to be foundationx2 - garage.
GLA isn't supposed to include closets, hallways, walls, etc.
Anyway, I'm still going to the open house, but I'm kind of frustrated that square footage doesn't actually mean anything close to reality.