What I would like to know is, what does first class, second class, and so forth mean? Are they a grades of small, medium or large? Or are they a means of imposing permissions on what SE will let you include in a cheaper small, medium or large house? (CMs, I'd be curious to get your views on this one, as we have an FC that are considering acquiring small - and trading up later. That said, I've also seen discussion in here about the possibility of owning more than 1 house at some point in future.)