Building C is one of the main three buildings in gm_construct. Various anomalies have been encountered in its gm_construct 13 beta iteration.
Building C's exterior is similar in appearance to Building B. In vanilla gm_construct, the interior is entirely empty while in gm_construct 13 beta, two staircases wind around the sides to the credits room and the roof. Underneath the staircase on the left is an entrance to the Tunnels.
- Two baby doll globes can be found in Building C:
- One is found on the roof while the other is found on top of the credits board.
- Dark Kleiner can occasionally spawn at Building C's entrance or on the roof.
- Pressing the button behind the credits board initiates the Gm13 pootis event.
- Using your flashlight on the backside of the credits board reveals credits referencing A.R.C, Eagle Detector, and the A.M.T.F..