From 1950 to 2008 the USA built ~25 million homes per (edit, not year) decade. From 2008 to 2018 it was about 7 million. In recent years building rates have mostly recovered but there's still that gap in production combined with everything else the last handful of years. This isn't to discount the shift of ownership from human persons to corporate persons, that's a factor too. But just numbers of available houses ver…
Its not only the us dealing with this.
In many Western countries a large part of the population has been incentivised by both tax cuts and monetary policy to own property that it's become very hard for governments to change those policies to again make houses affordable without huge cuts of the wealth of their middle-class.