Don't worry the housing prices will drop off a cliff after the up and coming massive earthquake finally hits San Francisco. It's guaranteed to happen, it's just a matter of when. You'll have a whole new set of problems but a lot of people are going to haul ass out of there and rent will drop. And the subsequent effects will fix a lot of the real estate problems. First, whatever the earthquake doesn't destroy, the fires or building demolitions will. In the ashes or rubble where the old low-rise "historic" buildings stood, new buildings will finally be built and you can bet your money that they're going to be high density. NIMBY (not in my back yard) residents will have so many other matters to attend to that they won't be so strict about keeping San Francisco looking the same as they remember it as kids so progress will be easier.

With destruction and death, comes renewal and new life. Fitting for the startup capital of the world actually.

I wish everyone the best of luck surviving and may the death toll be as minimal as possible.