Headquarters

You start with the Headquarter. The Headquarters is the heart of any base. To begin with it can store up to 10,000 titanium and energy. Leveling up the Headquarters allows you to build new buildings and defenses, hold more resources, and train and produce more troops. Eliminating the enemy Headquarters in battle gives you 1 guaranteed star. Put the Headquarters in the center of your base and protect it with multiple layers of walls and defenses.

Space Headquarters

 * Space Headquarters are available when you get access to space at Headquarters lvl 7.
 * Space Headquarters will cost Antimatter only and will unlock higher upgrades for all land buildings (and units)
 * Space Headquarters can be raided once you've destroyed 60% minimum raiding a land base if target has a space base and if you've built the Space Shuttle Platform (and obviously trained troops in it)