Thank you for pointing this out. I had mistakenly assumed that my JOSM building plugin was set to the generic building=yes and not building=house which is obviously way too specific. I'll change that, and also review the few other buildings I've traced this past week. Regarding the unsplit terraces, I didn't feel aerial imagery was giving me enough information to correctly determine how many sections there are, but of course, again, they should have been building=yes and not building=house.