Iris and Allegra confront the man photographed with Esperanza before her disappearance and learn he works for Maelstrom Couriers in episode 6x07 "The Last Temptation of Barry Allen, Pt. 1".
Kara and Mon-el land atop a garage near her apartment where he continues to attack her in episode 2x17 "Distant Sun".
The Fringe team finds another victim on the roof of this parking garage in episode #313 "Immortality".
Richard watches Maddie as she returns to work from across the street in episode 1x06 "The Maddie Code".