Take it al with a grain of salt of course, it's just a newspaper columnist and not a full analysis but it's the best I've seen and he cites his sources.
The build rate required to hit that is about 65,000 units/year, which was about the rate that the Bay Area built at in 1971, which has severely tapered off since then:
However, everybody I hear talking about remodeling or building is saying that right now there's a construction labor shortage in the Bay Area, and we're nowhere near building 65k units per year, so it's going to take many years to build up the labor force and construction capacity too.
Building is a long term, but necessary fix to the housing crisis.
According to what data?