I agree that people shouldn't be living on the streets. However I'm not sure about regulating rents. If you decree that people should be able to pay $500/month

I agree that people shouldn't be living on the streets. However I'm not sure about regulating rents. If you decree that people should be able to pay $500/month for a 2 bed apartment in SF, who is actually going to provide that rental? The only possible way that will happen is if the government provides the rentals. Now, that may be a good way to do it, but it certainly won't work with private rentals - landlords will simply not bother renting at all if they're going to lose money on the deal.