How detailed do you furnish units for 'for rent'

I like to have all my builds ready to play at least to some degree before I move my sims in

exception being 3 huts I have in Sulani entirely dedicated to the whole " furnish as you go" thing but even those I did build the huts before i moved sims in

I also don't like to refurnish my sim houses too often so yeah I'm hoping that making it rentals property rather than tenants will avoid that if i kick sims out or whatnot

might use empty units but at the same time I don't think I will because I would like to use those 99 units wisely