Earlier quoted context omitted.
Decades of under-building due to restrictive zoning laws will do that.
Do you have numbers to back that up? If anything, underbuilding came from a moribund housing market after 2008, as many left the industry and it took way too long to ramp up on talent when housing began to boom again (a lack of people skilled in building houses is still a problem). But I doubt this is an under building problem at all. Look at Seattle and the area, and there isn’t a shortage of new housing projects at…
https://www.cato.org/sites/cato.org/files/pubs/pdf/pa-823.pd...
I found the section "New Evidence on the Effects of Land-Use Regulation" to be quite interesting in past reads (and discussions) and probably relevant.