If tax goes up, it's because the value of your asset has gone up. Either sell it or do a reverse mortgage. I have no pity for those profiting from the system, regardless of their age. Fuck you, Grandma, pay your taxes.

I feel like best plan here would be to impose steeper taxes on second-plus properties.

That's definitely part of it, and more important than taxes on primary residence. But we should do both.