Google Software Engineer III interview questions

Onsite interview in 2011. Got an offer, which I declined. Recruiter warned me that if I declined, the offer could be off the table if I ever changed my mind. In summer 2012 I got a new call from a new recruiter. I was told that we could skip a new round of interviews and could go straight to negotiating a new offer. This time I was receptive, but had enough leverage to get a bump in salary and stock units, AND specifically request that I get to work out of the SF office.