Solution would be: the more properties you or your company and network of companies owns, the more taxes you pay. These taxes cannot be legally forwarded to the

Solution would be: the more properties you or your company and network of companies owns, the more taxes you pay. These taxes cannot be legally forwarded to the renter. If the property stays empty for some time, you pay more taxes. There should also be a guard against people who rent multiple properties at once to dodge these taxes.