Seems like you're overestimating by about 20%.
http://www.turnerandtownsend.com/en/perspectives/international-construction-market-survey-2019/#
Regardless, as the paper I linked shows regulatory burdens like zoning restrictions have very, very serious effects on housing cost.
The amount of land in San Francisco stayed the same over the last 20 years. It does not even remotely explain the run-up in housing prices.
What does explain it is common sense - people wanted to 'preserve the character of their neighborhood' so they refused to allow new houses to be built for years despite soaring demand. This massively enriched anyone who already owned a home there and screwed everyone else over. Now everyone else who lives there is paying the price for their foolishness and selfishness.
The real answer is to abolish most zoning on a state level because the incumbent homeowners who dominate local politics have shown that they cannot be trusted to enact good housing policy. After all, they have a direct financial stake in NOT enacting good housing policy as it makes their homes worth more.
In other places they can't recruit the talent they need, that's why they are where they are despite the high costs. I'm sure they would rather pay lower rents and salaries elsewhere but companies go where the market demands. It would be good for the country if more areas outside of the expensive coastal metros could become more economically competitive but so far that just hasn't been the case.