I think this is the same thing masonspappy is getting in his render. There was no bump map with the model, so I used the diffuse map. This is at default on the bump settings. It disappears if you change to .001 or take the map out of the bump slot.
Rendered at .001 on bump setting............you can also see the same thing at the top of the right wall toward the front of the building.
I'm attempting to fix this bug today.
Has anyone seen this occur with materials that don't have bump mapping?
I have not encountered this issue so far.
No, I haven't.