The Gary HQ is a place used for Gary and his OC's hang out and relax. It is very similar to The Nico Studio.
The Drawing Board
The Drawing Board is where Gary and the OC's go to come up with new OC and stories. Currently they are coming up with ideas for Total Drama OC's, Benny (Mikey's older brother) and Aerin (Mikey's ex-girlfriend).
The Lounge is where the OC's like to hang out after a long day of work/school. There is a snack/drink bar, a dance floor, comfy chairs and couches, and a robot maid to do their stuff for them.
Only Thomas steps foot in here. The Study Hall is used when Thomas does his homework, and plans his devious plots. The other Gary OC's do their homework at school or they don't do it at all.
Video Game Room
All of the OC's use this room. The Video Game Room has an XBOX360 (with Kinect), a Wii (with two controllers and a WiiU), PlayStation3 and about 4 Nintendo 3DS, 3 Nintento DSi, and a regular DS Lite.