From SE Wiki
Packages should be addressed to:
Department of Computer Science
10 King's College Road
University of Toronto
Toronto, Ontario, Canada
Fax: (416) 978-4765
Switchboard: (416) 978-6025
The department page for visitors has good information on how to get here physically.
We are in the Bahen building, third floor, room 3245 (left out of the coffee shop elevators). Unfortunately, we have to keep the main entrance locked for security reasons. Use the phone to contact someone to let you in.
Also see our physical floorplan (reasonably up to date).