Super duper NYMBys!
In LA, you used to have a ton of extremely cheap studio apartments. We're talking $600 for a nice studio apartment with its own bathroom, you had SROs as well which while not luxury apartments, provided housing.
But the vast majority of this housing stock was very old and created before there was thousands upon thousands of regulations, for example most apartments in Los Angeles need to be constructed with parking. You have to have a certain amount of outdoor space, etc. So you end up having housing cost twice as much as it really needs to .
It's really sad too, because just 15 years ago or so you could have a minimum wage job and afford your own place. Now that's not really obtainable anywhere in the United States. I've met tons of young adults, some even ranging into their 30s who have really bad home lives but can't afford to move out .
Solutions to this are often really short-sighted, you have affordable housing units going up which are costing $600 to $700,000 for the city to build. Obviously this just doesn't work so you have a bizarre lottery system just to have a roof over your head.
Personally I think the solution would be a combination of subsidized high speed rail and an aggressive rethinking of what a town needs to be. Imagine being able to hop on a high speed train that goes about 150 miles an hour.
You could have a community of affordable housing that's a short train ride away from San Francisco, LA, or any other unaffordable city.
I've also noticed you have a very bizarre system where many working-class people, rail operators, firefighters, teachers, etc. They have super commutes which are ranging from 1 to 2 hours each way just to get to work.