Apple was never actually "in" that building at 770 Welch Road. It was their answering service and mail drop when they were still in the garage.

Here's a better view of the building:

https://www.google.com/maps?q=770+Welch+Rd,+Palo+Alto,+CA&ll...

The answering service was on the first floor near the front door - right near the map pin in that view.

I have a somewhat embarrassing story about Steve and me and that answering service:

http://www.reddit.com/r/IAmA/comments/h4n5w/i_was_one_of_the...