It is the "Raised Ranch House" from Stoezel's Structures. What I like the best about it is that the building is made with in the intent of using foamcore to reinforce the walls and floors. What do I not like? The biggest thing is the roof, which is almost exactly flush with the side of the building, rather than having it hang over the edge slightly like real roofs do. But it is pretty cool with a fully detailed interior including a two-car garage, and for the low price of $5.00. Morever it includes several different color exteriors so you can make different homes that won't be completely identical.
Note: I didn't put the exterior steps on the building because I find cardstock steps particularly fiddly and I can make ones pretty easily from Hirst Arts blocks.