So then the apartments and condos become more expensive due to skyrocketing land values, not solving the problem of affordable housing? You can expand current low density zones with limited medium density without impacting values too much, but NIMBY concerns aren't completely crazy. Either new zones are created for multifamily high density and medium density housing instead of opening single family low density zones for these projects, or we accept that as a society we are fine crushing a percentage of the middle class to solve housing for the lower classes. The top 10% may take a hit on real estate dips from rental properties, but not crippling. We can spread the damage slowly, but houses losing 10-30% value will cause a miniature 2008 wherever that happens.

This was caused by housing becoming a cornerstone step into and for remaining in the middle class instead of being a commodity like it was pre 1970/80. That probably wasn't a good idea, but changing that removes the largest remaining leg of the middle class. All options moving forward will suck I think, and it will take a lot of work to resolve.