Note that a Georgist tax on 100% of land rental value does not stop the landlord from earning a return on their improvement values. The land tax of a property with a 100% land tax will decrease the land price down to $0, and thus instead of for instance putting $500k into buying land and $500k buying apartments, they could instead buy 2 $500k apartments for the same capital cost. The end result of this will be more apartments, which will bring down rents, but this will yield a higher ROI than they currently achieve, since they have to pay less rents to the banks.