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On the plus side, anybody who gets in to owning apartment buildings at this point knows the score. The risk is not that you won't be able to find tenants. The risk is that you won't be able to charge them enough to make a profit (because of regulation). If you don't want to roll the dice, don't invest in rental housing. You can't claim that you didn't have notice. If you want good performing investments, you'd better prepare to be a slumlord, or you'd better invest somewhere else.

I say this as an opponent of rent control. The people you should feel sorry for are not the owners. It is all the people who want to come to SF, would have a better life in SF, would have a lower impact on the environment, would be more productive and make this a better country, who can't because housing prices are so high and there are no vacant units.