Harley Quinn Wiki

The Joker's Fun House is the evil lair of The Joker located in Gotham City.

It was destroyed by Harley Quinn when she broke up with the Joker and he sent his goons to attack her, who she easily defeated, taking the Fun House down with his own explosives. He began rebuilding the Fun House in "A High Bar" and by the time the events of "So You Need a Crew?" takes place, the building has been restored to its former glory and Joker is watching TV in his lair. It is unknown what happened to the lair after the Joker was turned "sane" in "The Final Joke" and moved in with Bethany.