Carter Hall talks to Kendra Saunders on the rooftop and later she returns there to jump off in episode 2x08 "Legends of Today".
Jesse Quick confronts Rosalind Dillon AKA Top atop the the building and is hit by her vertigo whammy causing her to fall off in episode 3x04 "The New Rogues".
Oliver meets with Merlyn on the roof of a parking lot and proposes his plan to save Thea in episode 4x13 "Sins of the Father".
Oliver battles Malcolm on Nyssa's behalf for control of the League of Assassins in episode 4x13 "Sins of the Father".
Diggle and Dinah see Alex Faust running across an adjacent parking garage and pull a manuever to shoot Diggle over at him in episode 6x03 "Next of Kin".