Turn slightly to your left, looking down the hallway that you are standing in, take one step forward and right before the end of the hallway, there will be a opened room with electrical boxes in front of you, go into this room, take a step towards the black toolbox underneath the window, and then turn around and you will see a opened door to the right, go through that door, take a step into this room, you will see a lot of storage, take one more step towards the corner of this room and you're done.