The question is, is it feasible to build enough supply for this to happen? I mean, if SF ever hit "affordable" on a median family income, the population would

The question is, is it feasible to build enough supply for this to happen? I mean, if SF ever hit "affordable" on a median family income, the population would probably be tens of millions. Keep in mind that tearing down old housing and building new is not very cost efficient: you are paying for land, and the old structure (which you are tearing down), and the demo of the old structure. I live in LA, and my structure, which was built in the 70s, is still valued at more than the land it's built on.