Next door is the room. The latter has a glass window between the room and the window glass is found near the door, one that could turn into another one.
Next door is the back room. The room has a window with a glass partition between the room and close the door with a glass window to a door that can be opened into one room.
Next door is the back of the room. "). The back of the room is a glass window between room and near the glass window is the door again one of the doors that can turn into another room.