The hotel where Shawn and Gus stay in episode 5x10 "Extradition II: The Actual Extradition Part".
Hotel where Ashton Bonaventure is staying in episode 4x14 "Think Tank".
Lucifer and Chloe investigate the murder of a therapist at his office in episode 1x08 "Et Tu, Doctor?".
Lucifer and Ella arrive in Vegas and find a crime scene with a dead body that looks suspiciously like Candy waiting for them in episode 3x06 "Vegas with Some Radish".
Source: What's Filming — Twitter
Later in the episode Malcolm Merlyn is receiving an award when Deadshot and China White attempt to assassinate him. Moira and Frank Chen attend a meeting about The Undertaking in episode 1x16 "Dead to Rights".
The team searches for Pestilence after several people in city hall get sick from a mysterious illness in episode 3x16 "Of Two Minds".