Harley Quinn Wiki

Riddler University (formerly Gotham University) is the main institution for higher education and research in Gotham City.

After Gotham was thrown into chaos due to the Joker's man-made earthquake following the events of "The Final Joke" and the Injustice League took over the city, the Riddler took control of the university and kidnapped some of the students to run in tracks to create electricity, making it the only place in Gotham with power and clean water. However, Harley Quinn and Poison Ivy with the help of Barbara Gordon took down his operation.

Superman and a mind-controlled Poison Ivy fought on the University's property briefly during the events of "Lovers' Quarrel".