Well, the culprit is the separate roof xxx.dds files located in the main texture folder (e.g., roof_North_America_North.dds, roof_North_America_South, etc...). Seems it's a texture file that's used by autogen buildings from houses to large warehouse style buildings. The top right section of the affected file(s) has default texturing for the side of a house's roof. Unfortunately, the same texture appears on the top of everything from select small office buildings to large warehouses. Not sure why MS coded the autogen in such a way, but it should've been caught in beta testing (IMHO). Also unfortunately, the only way to prevent the incorrect texture from appearing on the top of the building is to do a little editing to the affected files to replace the default texturing with something more appropriate for a building top. In doing so, now the side of the roof of houses has the texturing of the top of an office building. Crazy! Sorry folks, I can't figure out an easy fix for this that doesn't involve re-coding auto-gen files and the texture they use. That skill is completely out of my league.