In US income taxes, the inequality exists to this day. Owner-occupiers get to keep their rental income without paying taxes that landlords would have to pay (though landlords get to deduct maintenance), in effect taxing poorer renters at a higher rate than wealthier homeowners. When someone buys a house instead of renting, he gets an implicit tax deduction on the imputed rent that renters+landlords aren’t allowed to take.
So if we were to design a tax on hoarding scarce land, logically we would want to avoid the mistake that the US Treasury made in 1914, and include vacant landowners, rentiers, and homeowners in the same bucket. A normal property tax according to value gets this right by treating them all the same.
[1]: https://www.vox.com/2016/4/15/11432676/imputed-rent-taxation
[2]: Lawrence Zelenak, “The Early Income Tax and the Imputed Rental Income of Homeowners” https://doi.org/10.1017/9781108377157.008