It was change from building:part to building so both would render in 3d since one is a flat base with a gabled roof on top. When it was marked as building:part that was the only thing rendered because of the rule to ignore the building if it has parts. 
https://wiki.openstreetmap.org/wiki/Simple_3D_Buildings#Building_outlines
Alternatively I could have drawn another boundary as the building and marked them both as parts.