Personally, my answer for this [by the by my thinking that they make these multi-home owners abide by the same rules as everyone else was designed in my mind as a temporary measure to make more housing available until they implemented this] was semi-instanced ward maps. set up *kinda* like the apartments, only full maps. Each apartment can have up to 90 instances, to my understanding. If they set the wards up like *that*, semi-instanced, you could have up to 90 60-house wards in each housing area, and sure, you'd need to deal with a bit of load time unless someone else was already in the ward, but it'd solve a great deal of the housing crunch.