Apologies, I wasn't implicating you. Landowner could've been better expressed as corporate landowners. They're the ones that own the most residential real estate in large cities, which are generally the only places having this problem.

My house was built in the 1950s at around 1200sq ft. It's since expanded to over 2000, mainly from finishing a basement and expanding the top level. I'd be curious to see the data you base that on, because the people I bought it from passed this down generation to generation and had their entire family living in it. The house I grew up in has a similar story.

Another anecdote is that about half of the 1950s homes on my block were bulldozed and replaced with single units that have largely gone vacant. My cities issue is that we have plenty of housing, but even the bottom line single units are too expensive compared to wages because permitting and building costs are through the metaphorical roof.