Non purpose built for rental homes should be limited to one per person. Any more than that should be hit with cumulative tax rates for each home past the first until such time as it is no longer profitable to hoard them.

Not saying people can’t own multiple homes. It just shouldn’t be so disgustingly profitable. If it’s not profitable, prices adjust accordingly.

This is only really a thing in a paradigm of housing scarcity. Can’t speculate on houses if houses are not abnormally rising in prices year over year.

The housing scarcity is the root cause, and is most effectively addressed by the aforementioned method