The Govt are being very clever here. They know, or could reasonably expect, landlords to increase rents to cover the extra cost of paying net tax off gross rent received, and also have it not deductible meaning the amount paid won't reduce profits. To compensate for this, landlords will have to increase rents by more than the % property tax to retain the same profits. Win alround for the exchequer/paying off bondholders etc.
If the occupier was paying the property tax, the Exchequer would not be getting the extra income tax.