Grab his clothes, card and gun and go through the door he came out of. Follow the hallway to the left and you will come out to a room with cubicles. Stick to the left and make the first corner. Enter the door there and a scene will play as you enter the oval office. Once the scene is over, chase Mark and stay close on his tail or at least keep an eye on the map to see where he is running to so you can follow. He will run out to an outdoor area and start to open fire on you. Use the boxes in the area as cover and fire full tilt when he steps out into the open. Once you drop him, run over and take his custom 1911 and his uniform. Climb the ladder there, and run through the door on the left. Now all you need to do is make your way back to the entrance of the east wing where you first entered the game and head outside to the gate directly ahead of you. Walk up to it and escape to complete the mission.

Requiem

Objectives: Kill all Witnesses

For this last mission, when the credits are running, wiggle the left analog stick to wake up 47. As he gets up, shoot the closest guards and start running backwards to the walls in the corner. Use them as cover since you will probably need to reload about now. Let the guards come to you and shoot them as they come. Once you have taken out all or most of the guards in the room, go around and pick up all the weapons and ammo that you can. Mp7’s will be scattered about and should reap you a lot of ammo. Exit the building through the slotted glass walls and look on the map to where the few remaining enemies are. By now they should be at the cars on the road and should only be about three enemies left. Take them out from a distance if you can since the Cayne has a custom 1911 that does some heavy damage. The reporter should be the last enemy to take out as he tries to go through the main gate to escape. Shoot him and sit back to watch the ending scene as you have now finally completed the game.