Who said anything about banning single family houses? I just said we should get rid of single family housing zones. It's a fact that Single family zones were created to prevent building multiple family houses which are are associated with low income housing. It was a workaround against having " no black people" written into housing guidelines which was definitely a thing before the 50s. After they've always changed saying that they couldn't do that, a lot of places created restrictions limiting housing to single-family housing because poor people, aka the blacks, couldn't afford it.