I want to see towns implementing rental tokens like NYC did cab placards. You have to pay the city every 5 years and the house must be inspected before the token is issued, otherwise you lose it and the current residents get to live rent free. You have the option to sell the house, current residents get first dibs and their rent counts against purchase equity.
Also, there is a limited number of these tokens, so there can be only x% of the single family homes in a town that are rentals.