When a mission for the Daily Bugle is available, start it. Go inside the building and Robbie will assign you a project when you talk to him. Leave the building to start the mission, and then go back in. Wait inside the building until the mission failed message appears. When it asks you to select either "Retry" or "Do something else", select "Do something else". You will then appear at the top of the building as Peter Parker. Walk over to the race, but do not start it; this will allow you to use punch. To get off the top of the building, walk over to the edge. Hold forward and repeatedly press punch. You will fall off the building to the ground. To discontinue playing as Peter Parker you must die.