The Command Center is the main hub for your Base and manages all operations. Upgrade the Command Center to unlock more buildings.
Often called CC for short, this is the main building in the game. All other Building's Levels are limited to the same level as the CC, or lower, and therefore all progress is limited by CC level. In March 2013 new Buildings were introduced which had other Buildings besides the CC limit their construction Level; one example is the Constructor Building which is limited by the CC Level and the Defense Lab's Level.
The CC is the target of all attacks, so be sure to surround it in a cluster of Turrets and Buildings. More Buildings and Guns are available when the CC is upgraded. When you destroy a CC, you will win the battle even if you had not attacked the other Buildings. So, the best strategy for winning a battle is to target the CC and get as near as possible, so you can bring in Bombas, Pulse Tanks, Decimators , Specters, or Devastators to finish it off. The Base size will be increased at L13 CC, L14 CC, and L16 CC.