Maybe you need 5 chairs? Here in SF supply has fallen decades behind the demand curve to the point it may be impossible to catch up even if all you did was build build build.
decades of reasonable, consistently applied housing policy led to the creation of islands of wealth, surrounded by oceans of poverty. ergo, this is the purpose. this is how the people there want to live. I left many years ago when I realized the futility of it all.
What buys you a trap house or an apartment with hallways that smell like piss in SF or the Valley will buy you a mansion in 90% of the country at least.
Everyone wants to blame existing landowners and sure they share part of it but the lion's share of the blame ought to be directed at do-gooders (land owning or otherwise) who are unwilling to be honest (with themselves, or in the internet comments) and admit that every policy that "looks good" based on the one sided statements presented in abstract by its peddlers.
Each one of those policies is part of the system that gets us the results we have and the peddlers all share in the blame.