Enemy campus? Is your school some kind of Hogwarts-type school with overt sectarian conflicts?
NTNU is split into two main campuses - Dragvoll (history, language, psychology, etc - my campus) and Gløshaugen (physics, chemistry, math, etc). There is a sort of rivalry between these, on dragvoll toilet doors someone is advertising for their blog "behind the enemy lines: a dragvolling's life on gløs". Gløshaugen is, funnily enough, often nicknamed Hogwarts because of how the main building looks.
I found the right building! Thanks to my scrawled down """"map"""" I made before leaving the house, and starting to look an hour before meeting. Go me