Source: What's Filming
Laurel comes out of CNRI after accepting a job there in a flashback and talks to Tommy in episode 3x14 "The Return".
Two dance contestants die from poison after a rehearsal leading to Liv and Ravi going undercover as dancers in the contest in episode 5x03 "Five, Six, Seven, Ate!".
Juliet, Shawn, and Gus emerge from the apartment and see Billy McGoldrick coming out from across the street.
Lydecker investigates an archeological dig in this closed down building in episode 2x03 "Proof of Purchase".