If I recall correctly this was ground level of building 115, now renamed Studio G. Someone from Mac BU cruising the halls on a Razor scooter while wearing a propellor beanie once gave me a peek in that lab.
I seem to remember MacBU was in San Jose, maybe that was before this post? Or were things split between the locations?
One thing that was interesting about MacBU was that it was in a completely separate division from the rest of Office (i.e. Windows Office). That gave the team a really cool outsider vibe and the team had a really nice close-knit culture.