That seems weird, the opposite position makes more sense to me. You can’t think of any possible economy where you could morally have two houses, and in this situation it’s somehow necessary? Could you elaborate further, because it seems reasonably plausible that there could be an economy with significantly more houses than households, to the point of warranting multiple ownership. And of all the things to call second house ownership (convenient, luxurious, smart, excessive, warranted), necessary isn’t the one that comes to mind.