The Radar Tower was originally an upgrade of the Sensor Tower. It was a structure that automatically scanned for enemy units and buildings in its range. It also emitted an alarm as soon as enemy units were detected within its wide radius. Units appeared as a red exclamation mark on the map in the fog of war. Radar Towers were also crucial for Missile Turrets since only Radar Towers were able to grant the Detector ability to them. Position and sensing radius were both visible for every player on the map. Although the initial Radar Tower was upgraded from a Sensor Tower, it was changed to fully replace it. The new version had the almost exact appearance and abilities as the Sensor Towers have now. It was renamed before the official Beta started.

The Merc Compound was once called the Merc Haven and Munitions Dump. It was used to train Reapers, which worked similarly to hiring units from mercenary camps in WarCraft III. There was a maximum number of units "in stock" at any one time with that number slowly regenerating over time. Reapers were inexpensive with a build time of one or two seconds. Four Reapers could be bought from a single Merc Haven in quick succession with another reaper becoming ready to "hire" every thirty seconds 

The structure also upgraded Marines at one point. By November 2008, the Merc Haven was removed, and the model repurposed for a bar in the StarCraft II campaign. It returned as of April 2009, but ultimately did not appear in the Wings of Liberty beta. Beta files list it as the "mercenary port. 

Above the old Merc Haven was a holographic woman doing the female night elf dance from Blizzard's World of Warcraft, itself inspired from Alizée's J'en ai Marre dance.