The Advanced Training Centre.
As much as the name sounds to be one particular building in an instance, Jin actually took the effort to create an entire school campus instead of that one building. From all the feedback that he received from the Demon Exorcists, he figured that if he were to attract the best of the best Demon Exorcist cadets for training, he should create proper schooling facilities for it. There was no better way to attract the best than to build extensive world class facilities.
From classrooms, lecture halls to Olympic sized swimming pools & gymnasiums, Jin even created a fighting arena stadium for them to have their duels against themselves and of course, against demons.
"While I kinda expected more from the Cultivation Zoo other than regulated environments, this one totally kicked me out of my boots." Claire had her jaws down when she saw the size of campus from the school's one and only watchtower which Jin specially created for the principal and their staff.
