The Gruppe Sechs Headquarters is, as the name states, the headquarters of the security company Gruppe Sechs (called Gruppe 6 in Grand Theft Auto IV). The Gruppe Sechs Headquarters are located in Leftwood, Alderney on Long John Ave, directly opposite to the Westdyke Memorial Hospital. However, no Securicars can be found there on any of the various parking lots. Also, the building in inaccessable to the player although it can be entered by the use of Modifications and trainers. The building is a dark brown brick building with windows and rectangular Gruppe 6 signs on it.
"Gruppe Sechs" is a play on the words "Group Sex"