I’ve seen some housing projects around my city that are actually quite nice. They didn’t end up being shabby because they were built poorly. They were shabby because they were reserved for the very poor and, consequently, became extreme concentrations of poverty and crime. This makes people unwilling to invest in maintenance and continued improvement of their homes.

If the government just went on a building binge of housing to be sold at market rate, or even set an upper bound before qualifying to buy them at a middle class income, it’d work out fine. That’s basically how Singapore does it only they couple it with somewhat aggressive policies to encourage people to downsize their living situations once they’re empty nesting to free up family dwellings for people with families. We probably wouldn’t need to do that second part since we’re not a claustrophobic island, and could just count on natural turnover.