- Valkyries, which also require an Armory.
- Science Vessels, which also require a Science Facility.
- Battlecruisers, which also require a Science Facility with a Physics Lab add-on.
Similar to the Machine Shop add-on for the Factory, when multiple Starports are constructed, the Terran player will elect to build the Control Tower on a subset of them. Particularly in the TvT match-up involving heavy Wraith production, the Control Tower is only constructed on one of several Starports to enable the Wraith Cloak and Cloak Energy upgrades.
During TvZ match-ups, the Zerg opponent may target the Control Tower with Mutalisks to prevent Vessel production, as the Control Tower is more vulnerable in hit points compared to the Starport or Science Facility.
Although the attached Starport has Lift Off capability, the Control Tower does not. Lifting off the attached Starport will render the Control Tower ineffective.