Yes, the Elan School was a real place:
I am a survivor of the Élan School, an abusive cult boarding school shut down thanks to reddit in 2011, ask me anything!
Thank you Reddit. You helped shut down the Elan School. I’m deeply thankful to this entire community. If you want to know more about this place, AMA.
Even skimming this post once will blow your mind, most probably think thats its made up but you would be dead wrong
Exploring Elan (the Elan “campus” after it closed)
The Murder of Dawn Birnbaum (died while on the run from Elan)