Not OP, but the limiting principle is democracy. That's what gets you off the slippery slope. A tax on vacant homes passed a referendum, but barely at 54.5%, an

Not OP, but the limiting principle is democracy. That's what gets you off the slippery slope. A tax on vacant homes passed a referendum, but barely at 54.5%, and SF is probably the least landlord-friendly city in the US. Nobody is proposing city taxes on unused guitars, boats, or graphics cards. That would never pass. There is no public policy benefit to doing so, other than generic tax revenue. And if it did, I would move and feel comfortable doing so because I would not want to live in a city whose majority voting population is bananas.