The the extent rent control has an impact, it'll be negative. If rent control with serious teeth was ever passed, it would become a fundamental cause of high h

The the extent rent control has an impact, it'll be negative. If rent control with serious teeth was ever passed, it would become a fundamental cause of high housing costs (or other, worse issues, depending on how it's implemented)! And I think in specific markets (San Francisco in particular) it may have more of an impact that you realise. But you're right that the issue now is zoning and building codes of course.