It's rare to be worth a lot more than $105k in SLC; wages are pretty low and deep specific expertise isn't often bought so much as grown in house. Especially with a startup.

If you're looking at $105k in SLC, you should be asking for $225k+ in SF by my experience.

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We did the calculation between $125k in SF and $45k in SLC a decade ago and SLC came out well ahead for a family of four.