Fellow Swattie here, 2004 vintage. The CS department has changed dramatically even since my time there. We took classes in the observatory building, but they’ve long since outgrown that space. They’re now in the new Science Center building, and I heard they’ve actually outgrown that space as well. It’s a very popular major!
Read that as "We took classes in observatory building". Imagining the prof explaining how to grind a mirror, how revolvers can be used to make a very high resolution angular positioning system, and so on.