Administrative buildings in Art of War 3 have a clear support purpose. They serve as the infrastructure necessary for the functioning of all other buildings. These buildings are the same for both factions and have an identical role. Headquarters (HQ) is providing CP (control points, or to put it in a different way, tells you how big army you can build). Powerplant provides energy for the functioning of other buildings. Construction Yard is providing space to build the rest of the base. Finally, Supply Center is producing the main resource used by units or buildings.