Single family zoning should be banned at the state level, and the federal level if possible. This shit is a plague on our country.
A lot of the older US cities have swaths of multi-family, condo, and tenement housing. Unfortunately it's still not enough, the biggest problem with a lot of these particular cities is that they need to expand public transportation infrastructure that was designed/built at the turn of the last century outward enabling more people who work in these areas to move outward. Of course real estate investment firms fight such actions tooth and nail because if you increase the viable housing market for people the highly inflated valuations start to come back to Earth and they lose money. In many cities around the world they restrict the purchase of investment property by foreign entities in highly valued areas to try and ensure that residents (who contribute to the local economy) get first dibs.
those who don't like democrat-led HUD's ideas of stopping building single family homes probably won't like this video.