Yes and no. You're not taxing the land as if it was bare or as if it was full; you're taxing it based on the perceived value to a developer.
> So, tell me how is that not a tax that is based on something that doesn't actually exist today? The assessor can say: Sure, it's just bare dirt, worth nothing right now, but you could have a skyscraper there and if you did, it'd be worth a lot. So we'll pretend it's worth a lot and tax based on that.
The value of an empty lot is approximately equal to the value of the developed lot right next to it. This is already being done.
> The other bad consequence of LVT is that it's supposed to force every bit of land to the most financially productive use. Do you want to live in such a society? Something like a free playground is never the most income-generating use for a patch of land, but it's a wonderful thing to have in towns.
Government-owned land could be tax-free since (in theory) it's being used for public good.