It seems like a cute solution. But it's a bit unnecessary, and complicated.
Ie you probably would want to tax under-occupation as well. (Otherwise you just declare a bunch of apartments as a single unit, and have a single dude check in every once in awhile. They did that in Britain, because of different legal treatment of trespassing between empty and `occupied' buildings.) But how do you define under-occupation? Where do you draw the line?
Just use a land tax. It's simpler and harder to evade.
Ie you probably would want to tax under-occupation as well. (Otherwise you just declare a bunch of apartments as a single unit, and have a single dude check in every once in awhile. They did that in Britain, because of different legal treatment of trespassing between empty and `occupied' buildings.) But how do you define under-occupation? Where do you draw the line?
Just use a land tax. It's simpler and harder to evade.