You could, you know, just build more housing. But that would be far too sensible. A 30% social housing requirement seems equally nuts. Who is going to want to build anything with those margins. If you want social housing, that’s great: raise taxes and pay for it. Throwing a massive wrench in the market machinery helps nobody apart from the politician who wants to create the impression that they are “doing something.” The unaffordability crisis is just going to worsen, until you end up with an S.F. situation, where the middle is hollowed out and only the extremes remain.