On Top Of Conference Table In Five:

You first start out behind the podiums (normally). Next you walk up to the door across from you (the right one). Next shoot the bottom of the windows out with two shots. Rebuild the barrier; it’ll get two boards one above another. Next go to the corner where the boards are lowered and jump up on them. Once on the top board jump on the top frame of the door. Do a QUICK dash and jump on the side table. Next dash and jump on the middle table. Neither zombie nor the thief will be able to reach you unless you get too close to the edge. And also have a lot of ammunition.