Run down the stairs and enter the door opposite of the diner. Shoot out both lights then jump and crawl onto the metal cabinet on the right. Take out your SC-20K and wait for a guard to enter the room. Quickly shoot him in the head. Another guard should enter. Also shoot him in the head. If another guard enter, do the same thing to him. Then, run into the dining room. Jump and crawl onto the cabinet on the left. Jump onto the balcony and slowly walk in. There will be four guards (two on both sides of the room). Very quietly walk to the other side. Jump onto the rail (while crouched) and hang on. Quietly fall to the ground and open the door to complete the mission.