Proceed left and jump off the red board to the next roof. Move forward, jump right to the roof below and roll to prevent harm. Climb the fence ahead and use the red plank to jump forward to the next roof.
Two Blue Runners will be waiting on this roof, so it's safer to escape than fight. Continue forward, climb the wall, jump left to the next roof, and climb the air conditioner. Jump left to the next roof, hop the fence to the right, and Wall Run over the red wall onto the blue scaffolding.
Vault right, over the red bricks to land on the next roof. Climb the small building to the left, and jump down to the mat ahead.
Pass through the red door ahead, down the hall, and ride the elevator to the next roof.
Move forward over the next three roofs, climb the building to the left, and jump left to the red pipe. Slide down the pipe and jump right to the next roof.
Here, two Blues wielding automatic pistols will burst out of the right hand doors. Disarm the closer one, and use his gun to kill the second one. After the fight, continue right up the red pipe, over the fence, and on to the roof ahead. Jump on the fans to the left, hop between the red pipes, and on to the second set of fans. Leap forward on top of the construction elevator, Wall Run right, and Wall Jump left to land on the handing block. Enter the door ahead and ride the elevator to reach the atrium. Proceed right towards the lobby entrance and two more Blues will pop out from behind columns. Use the heavy machine gun to kill these last two enemies, and continue forward through the revolving door to complete the chapter.