It’s so strange everyone makes this out to be a complicated problem. We just need to build more.
If you were to put a 'food czar' in control of feeding everyone, it would never occur to said czar to just let businsess willy nilly put restaurants wherever they thought they could make a buck. It couldn't be that simple.
You ask what we should be building, and where? How about replacing old single-family homes in the Bay Area or Los Angeles with high-rises, or at least mid-rises...or at the very least town houses or something!
Wait.