These are the buildings, land based structure can be used to help with production or supports the war efforts. Building is crucial in a war, as it effects the rate of units as well as strength of economy and tactical defences against invasion. Buildings will spawn reinforcements like space stations which gives a tactical advantage for the planet holder. The types of units depend on the building. Some buildings also have ability to improve unit by upgrade, it will cost credits and and will take time to take effect and as well as spawn their own troops (these effects only work within a land battle/planet). These are part of the Planet Upgrades, they all have their usefulness so choose wisely as there very limited spots .