New supply is NOT subject to rent control in any way shape or form. Only non-single family housing that was built before 1979 (or maybe 1980) has rent control. Nothing built after that is rent controlled at all.
This is sort of true, but in practice (in the bay area) new construction only happens at the whims of neighbors. Since rent controlled tenants are totally insulated from supply and demand, it's common for tenants to only evaluate their annoyance with new construction, and not the beneficial effects on the rental market. Renters can only be NIMBYs even they're locked in by rent control.
