It's the ratio of homes to jobs. "How many homes does SF need?" is hard because it's a moving target as the city permits new office construction. I ballparked

It's the ratio of homes to jobs. "How many homes does SF need?" is hard because it's a moving target as the city permits new office construction. I ballparked the housing gap a while back by comparing the ratio of employment/residents with 30 years ago and came up with ~80,000 missing homes. That's in a city of 400,000 homes right now. An imperfect measure for sure, but I think affordability is achievable if we stop prohibiting the solutions.