Some suggestions:

Main (former residence)
Student Union with vending machines and old telephone kiosks along a wall. Stories about a phone ringing in the night, and if you answer, all you hear is moaning and panting. Someday we'll get that spirit out of the switchboard. Summer used book sale and S&M (science & magic) fairs for the kids.
Student book store (with official Sanctuary Hill swag! Go Grims!)
Student Health Center
College police
Scattered telephone booths.
Mary Parker Memorial Library (Remember to call for an extension, late books will be summoned). Still using Pneumatic tubes to convey book requests to the underground stacks. Lunchroom with vending machines for sticky ice cream sandwiches, small heated tins of potted food, half-frozen sodas, sandwiches of unknown mystery meat, and Charlie, the library ghost. Died in WW2 during the London Blitz, not all together sure how he got here. Likes to pull pranks, and is typically called in for introductory medium classes.
Classroom building(s)
Science building 
Nuclear Reactor building
High Energy Magic Research Building (people have been known to leave *before* they went in)
Computer building
Registrar building
Sanctuary Hill Federal Credit Union
Art tower - sways in the wind, weird capsule like elevator cars.
Steam tunnels - mostly occupied by abandoned feral familiars, who wander the campus for hand outs and good garbage.
Gym
Pools
Basketball courts
Tennis Courts
Football stadium
The "Clump" - some pine trees on the far side of the football stadium, known hangout spot
The Visitor Center - across from the Football Stadium.
"Old" dorms with central cafeteria building. Currently empty as construction crews rip out the old wiring and plumbing. Hopefully that will rid the place of the last few ghosts, they're mostly jerks.
New Dorms with cafeteria on ground floor. Known for the raised carpet flooring.