You'll start the mission off in the courtyard of an apartment complex. Begin moving towards the north-east of where you are facing and you will find a ladder. Climb it until you reach the top and you will notice a trap door on the top of the roof. Open the trap and hop down, making your way to the opposite side. You'll come out to a small vertical shaft with an opening above. Climb the lone pipe to the top and you will find a burning building on the opposite side of the street. Jump under the zip line to grab onto it, and ride it down to the open window.