Not sure where you read in my comment that it isn't "boomer zoning" but I believe you are referring to one of the largest proximate causes.

"Corpos" are filling in the gap because a ridiculously sticky real estate market means that there are a ton of places that could easily bear more renters. These corporations are typically paying far below the average for homes in whatever state they are buying in [0] (somehow paradoxically this becomes bidding home prices up) and typically allow more renters to enter the market rather than being priced out.

[0]: https://www.corelogic.com/intelligence/the-beginning-of-the-...

I read your post before you edited it. Nice edit. I think we mostly agree on the correct policy direction, now, if not on who promotes it.

fwiw, I'm on the left - I just can see that our old pattern of finding a boogeyman that isn't policy choices to blame it on simply will not work for this problem.

"boomer zoning" is largely responsible for the lack of supply GP blames.