Earlier quoted context omitted.
If you want to tax properties, why not taxing both the land and what is build upon it? And wardrobes, tables, books or computers (every year) but that's another story.
The idea is that you tax the land only as if it was being used for best use - so that every property is encouraged to develop to maximum density. I suspect that in actual use it would end up having a small to no effect.
Maximum value, not maximum density.
They may tend to be the same thing, but that's not necessarily the case.