Team Downsize HQ is the headquarters of Team Downsize in Zexal. Outside of the headquarters, there is a giant cardboard Downsizer holding a sign saying "NO AWKWARDIUS NUMBERIUS ICEMANIUS ALLOWED!", and a giant cannon. Despite not having a moat, there is a drawbridge.
It is unknown how big the headquarters is, but it is big enough to house at least ten hundred thousand million Downsizer Grunts, with room to spare.