A while back I wrote about the underground Frankfurt Data Center at the airport. Recently I ran across another Frankfurt Data Center calling itself a "Tier IV Shell Data Center".
This looks to be an offering from global real estate adviser DTZ.
The stats, pictures, location and brochure can be found here. The interesting thing (that I liked) is on the facility page you can download a PDF of the typical floor plan (a Worldcom document?). I like looking at these just to see how others arrange their rooms, rack layout, etc.