If you’re not with Google, you’re not getting in.
While this may not be one of the world’s top secret or most exclusive locations, Google takes it security very seriously and cannot afford a breach at any costs. Therefore, if you do not work for Google, you ain’t getting in, No exceptions!
So don’t think that just because you know someone whose cousin’s brother’s uncle works for Google, they will give you a tour of the place. Never in a million years.