Ask HN: Salary increase from Seattle to Bay Area

Software engineer contemplating a move from Seattle to Mountain View. I'd be coming in at the senior level to a company considered a "unicorn". When I do the math on the cost of living increase and what I currently make, the minimum salary that I need to make is 175K. Is this low, on target, or high for a Senior Engineer in the valley? Initial offer is in the mid-150K range.

I should note, I'd be leaving behind a job I'm not completely unhappy with, co-workers that I like, and friends and family, for what looks like a great job in a place where we don't know anyone.