Go down the ramp. On the first ramp you see, do a light air trick. After that, turn left and go towards the rail which leads upward. Turn right and jump over the parked car in the parking lot then turn left. You will see a small ramp in front of you that heads towards the building which resembles a house. Line yourself up on the ramp so your going towards the fireplace. Jump and do a Back Flip once you are in the air. At the top of the roof, do a Back Flip over the fireplace in order to get the Secret Cover.