After escaping the Anomalous Materials lab, Gordon enters an expansive wing of administrative offices. As he fights through the offices, he encounters a number of surviving personnel who tell him that soldiers have arrived to rescue them. Gordon must get topside to rendezvous with the rescue team. Gordon will eventually enter an elevator and end up at the beginning of We’ve Got Hostiles.
Office Complex is the fourth chapter in Half-Life.
The office complex features Zombies and Vortigaunts as the primary enemy, and introduces the Ceiling Turret (which only appears a small number of times in the game). The chapter also contains a number of friendly NPCs who can assist the player. The Shotgun is introduced in the chapter as well.