but I think $3000+ is about right for 1000 sq ft in a reasonable part of San Francisco, it goes up quickly from there.
The point is, though, that if you are trying to map your current Midwestern (for example) lifestyle to the Bay area or Boston or NYC or whatever, then you are always going to reach ridiculous conclusions like you need to make 3x your salary. That's about as ridiculous as me saying that it would cost me much more to live in Ohio than it does in NYC because I'd have to pay for airfare every weekend to see Broadway shows and I'd have to install my own subway line to have a convenient no-car commute.
Your lifestyle is *different* in different places. You aren't going to get a 2000 sq foot house with a 2 car garage in San Fran. Depending on your situation, you probably aren't even going to get a 1000 sq ft apartment--you'll probably get a couple roommates for a 1500 sq ft place. However, you also get to live in one of the nicest places in the country. There are lots of ways to extract value per dollar.