As someone about to make this decision from outside of SF and with less knowledge about the market there, I'm curious to know what you think an SF "market-level" salary would be. Would you mind elaborating?
What goes unsaid though is that there's a lot of silly hoops that have to be jumped through to get that salary at many of these companies (bad interview processes, companies realizing that actually wanted X skills for a position instead of Y, etc.).
It would all depend on your skills though. I once turned down a $350k-400k opportunity myself in the area and ended up taking a significantly less amount in favor of more vacation, flexible hours, and much less stress.
When I worked at Google (2013) a mid-level engineer was making about 175-200k if you considered publicly traded stock and annual bonuses to be cash equivalent. The numbers grow quickly once you start ascending the ranks to Staff Engineer and beyond but again that's only about 10% of Google's engineers.