Where is the North Ladder Classroom of Beijing University of Technology?

The Information Building (Computer College) is an annular building complex with two entrances. There is a door on the left of the south entrance, which is the ladder classroom, which is the so-called Xinnan stage. From the picture, the information port is in the south of the west gate and the original security office, and the second teaching building (No.2 teaching building) is in the east of the west gate, that is, left, west, right, east, north and south.