Building are the providers and the consumers of the game. There is one building in the game: the KIXEYE Portal.
These buildings are needed if one wishes to succeed within the game.
KIXEYE is very tricky. They claim that War Commander is free to play. Yes, it is, for five seconds. The tutorial tells you what a good game War Commander is and lets you try some features. When you finish the tutorial, you return to your base to see nothing but a portal. The portal is called the "KIXEYE Portal" and the message is: "Try out everything you learnt in the tutorial by passing through the KIXEYE Portal. It costs $500.00 to pass, and once you pass it you can play the full version of War Commander."