When I was interviewing in San Francisco and Seattle at big companies (Zynga and Disney) a couple of years ago, they were wanting to pay me around $130k for a senior position, which didn't seem worth the move.
I also interviewed at Google and while I didn't get as far as salary negotiations, I was lead to believe by the recruiter, I think, that it would start around $110k-ish, although it also wasn't for a senior role.
I don't see how Dan Luu is thinking $200k+ salary is on the low end out there. If I could expect to get that I might actually consider moving to the west coast.