If downtown SF is dead, then people aren't living there, demand is very low and thus apartments are very cheap through simple supply and demand. You may want t

If downtown SF is dead, then people aren't living there, demand is very low and thus apartments are very cheap through simple supply and demand. You may want to increase density in downtown SF, and that's a reasonable decision, but you are claiming fewer people are there now then there were a few years ago. I don't believe there's been any drop in the number of housing units in the city, so that must mean apartments are empty. Is that the case?