I've been following the construction of the Apple "Spaceship" in Cupertino for some time.
The major feature of the new Apple 2 campus is the huge circular main building. It' diameter would nearly encompass the Pentagon.
Ever since I saw the plans, they reminded me of another building where I was privileged to work for some time in the early 1980s. The IBM Thomas J. Watson Research Center in Yorktown Heights, NY. This building opened in 1961, and was designed by Eero Saarinen and was in the form of a bit more than 1/4 of a circle. I might be misremembering, but I believe that it was designed to be expanded to a full circle, but IBM never pursued those plans.
The new Apple Spaceship looks like that planned expansion of TJ Watson. I'd long suspected that the radii of their two circles were similar.
Today, I got the notion to look at satellite images of the two buildings on Google Maps. I took screenshots, and used Photoshop to scale them so that the map scales matched. And then I masked out most of the grounds of Watson and overplayed them. Here is the result:
So, it actually looks like the radius of TJ Watson is slightly larger than that of the Apple Spaceship, although the width of the building might be slightly less.