Well, what about your own dwelling. Each of your rooms can house one additional family. And yes, I am counting a living room and a dining room too:

Communal apartments (Russian singular: коммунальная квартира, romanized: kommunal'naya kvartira, colloquial: kommunalka) are apartments in which several unrelated persons or families live in isolated living rooms and share common areas such a kitchen, shower, and toilet.[1] They generally lack privacy.

Well, I’ve lived in a communalka without a shower, a toilet was outside. These are bourgeois luxuries, they increase price of the house.