Drop to ground from there to skip the interior of the apartments entirely. Hop down to that and it should reduce you to 41% life. There's a box partway down, possibly an air conditioner. In Part 1 (The Rooftops), as soo as you start, look over the edge of the building, down to the street.
Here, hop onto the metal siding / door (a difficult maneuver). Jump on the railing / fence and follow it until it begins to start downward. In Part 3 (The Construction Site), by the barricade that you burn is a metal door and a raised fence. This leaves you right at the next safe room. You may lose up to 80% of your health, so heal up before you leap. On the next building, go to the left corner and jump into the highest branch of the tree below. Turn left, and head to the end, jumping up and to the right to the AC unit / box on the corner of the next building, allowing you to bypass the crescendo event. Head across the fence and jump to the other side of the horizontal fence. In Part 2 (The Crane), jump on the fence by climbing onto the vent cover.
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This page contains a list of cheats, codes, Easter eggs, tips, and other secrets for Left 4 Dead for PC.
