In the Maze Runner film, it is referred to as the Council Hall and is built of long branches and sticks.
Thomas described it as a "leaning structure of wood and windows."(Page 30) It is multistory with multiple rooms, as well as a bathroom and a room for nursing the wounded. The foyer and hallway were plastered with dark peeling wallpapers and there were missing floor boards, which indicates that it was poorly maintained.
It is a small house where some of the Gladers sleep. Underneath is a basement filled with weapons, only accessible by very few. It has been added onto and changed from the original building that was located in the Glade.