Earlier quoted context omitted.
Everyone who wasn’t gentrified out of their home agrees it’s great. An economist might foolishly brush off everyone being priced out of their neighborhoods as simply “externalities” but San Francisco’s politicians thankfully have a more nuanced view of the situation. And, as ghouse indicates, new housing isn’t subject to rent control so developers make a killing if they get approval.
This addresses active developers who are looking to profit from renters. There are plenty of speculators in the Bay Area who purchase homes without renters or buy them out only to sit on the home and not rent it (since it decreases the value of the home). This isn't a rare thing, there many pre 1978 residences with nobody living in them owned by overseas investors.
I’m not convinced it happens so much more in SF to cause the high rents. I think years of building almost nothing after the 208 crisis while jobs exploded is responsible.