Low-res mesh rendererd with vector displacement map extracted from the highres mesh in Mudbox.
So I tried to keep the poly count as low as possible for the house. I originally made it for an animation in which the house was a character so the overhang above the porch has some subdivisions in it so it can deform with blendshapes.
The pipes may have more edges than needed.
Here is an asset that I retopologized after sculpting it with mudbox. My goal was a super low res mesh that my laptop with pretty terrible specs could render. I then exported the vector displacement map which gets applied during rendering. The mesh is also subdivided at render time with a rendeman subdivision scheme. The low res model looks a little rough but the end result looks just the same as the high res mesh.