Yet, you cannot name a single "stifling regulatory" item that is unique to these areas, which is NOT cause by an infrastructure-related problem. Earthquake regs, water piping and pressure, sewer lines, extra roads and freeways, VERY limited footprints to expand ANY of those facilities into - those are ALL problems that are basically not solvable by any sane change in 'regulations'.
It's mainly supply and demand, and too many people want to live there. Accept it. Quoting random studies that bundle all "regulations" together and ignore many of the unique issues in these areas is simply nonsensical. You look completely foolish arguing "it's parking regulations", when someone else points out those are worse elsewhere and yet the properties are cheaper. Those cities have real estate and land to expand outwards; MOST of the CA communities no longer have this option, which creates an entirely different dynamic.
And this is going to play out all over the world with rising populations - only it won't necessarily be 'land', it will be 'water' or 'energy access' or 'roads' that are limiting factors. Our 20th century economy in the US has been almost entirely based on 'build/expand', 'build/expand'. That works, so long as you still have adequate resources (e.g. land) to expand into, or ample water resources, or places to run sewers and treatment facilities. As soon as ANY of those become bottlenecks, you will have the exact same response as what you seen in these coastal areas.
Sooner or later, you reach a limit on what an area is capable of renewably sustaining, and in SF, LA, SD, they are reaching those limits on land values and usable land and infrastructure.
People in America do not want our major cities to all be like Tokyo or Hong Kong or Shanghai. Apparently, you think those are great places to live with billions of other people on top of one another...