> If most of a city was zoned to allow up to multi residential highrises rather than most of a city being zoned for single family

The problem with this is the only entities with the financial power to build such buildings are large developers and corporate landlords. That leads to either high rents or high HOA fees. We need some way to pool prospective homeowners together to build this kind of high-density housing. Because otherwise we’re trading one problem for another and still failing to make home ownership affordable.