Why and how did that ear worm infect so many people?
This is largely what the Abundance agenda and YIMBY is all about... getting the left to stop throwing up NIMBY road blocks.
The problems with not enough investment in new houses are not limited strictly to blue states but blue states seem to have the largest problem with it. Democrats love regulation so much that states like MA and CA have erected so many zoning and building regulations that new homes have become incredibly difficult and slow to build.
We struggle to even build apartment size condos in suburban MA that cost less than $1.1-1.5M per unit. We are rapidly heading towards new houses being $2M+ in lots of parts of the state. By the time a developer manages to buy a lot and go through all the red tape, possibly tear down an old house, go through environmental review, etc.. they can't make any money unless they build a $2M+ house. Any lot that doesn't have an old house on it in the eastern part of the state will have a long list of environmental gotchas a developer will have to fight through, possibly for years before they can even start building anything.
Housing construction is so far behind the demand that who owns the existing houses has little to do with it.
PE and Corporate landlords own more property in left leaning markets because Blue policies have made it more profitable to do so. The more new construction is slowed, the more valuable the rental properties become. Some of these companies won't want to go near red states where construction is easy. The property values and rents are just not high enough.