Some questions that come to mind.

Is the price for land supposed to be the same in the entire country or should the government calculate a cost per region. A square meter inside a city would be more expensive to own than a square meter in the countryside?

What are you thoughts on implementing this tax system gradually? Could it work to assign certain parts of land that can be bought and taxed and then except the person from paying other taxes. IE: Buy this land, build a house and don't pay income tax while you live there.