I started working in MacBU about 3 years after the article. It was split between the two locations when I joined. (Outlook for Mac and PowerPoint were both in California.) These photos look like Building 115 to me, though I didn't go into this particular lab often. After this, the team moved to Building 31 and later Building 35, if I remember correctly.
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.