1. Starting point: the top of the ladder from the parking lot with the white box truck. At the top, leave that room. You should be at the top of a staircase that has several slanted windows above it. Start moving down the stairs until you get to the first (from the top) slanted hand-rail section. Stop in about the middle of that section of railing and climb on it. Aim at the second window from the right. Jump up there. You are on an outside roof and can jump out of the map to your death or hang out up there and snipe folk.

2. Starting point: the small blue car with a parachute draped over it. Facing the same direction as the car, you should see an opening in the wall with a light fixture on either side and a curved rail over the opening. Climb the wall to the right of the 'doorway' (there is a box there and the railing above is broken there), get on the railing to the right, turn around and jump on the light fixture's edge. Carefully scoot around it and jump on the curved rail over the 'doorway' in the wall. Turn around again and jump onto the top of the light fixture that you just scooted around. Jump onto the edge of the roof there (it is quite difficult and frustrating).