It is expensive in those other places for similar reasons as SF -- the government either tells them they can't (through zoning), or makes it very expensive (thr

It is expensive in those other places for similar reasons as SF -- the government either tells them they can't (through zoning), or makes it very expensive (through regulation, like IZ / "affordable" housing), or limit profitability (rent control), or some combination of the above. All of these reduce the supply of new housing.