CTO at Albert between Elgin and Metcalfe moved years ago to Laurier and Kent, but closed three years ago when AC shut down all its Canadian CTOs. CP's CTO on Albert just east of Bank also closed within a year if the merger.
ACE has a corporate office in the city, hidden in the bowels of one of the big towers filled with lobbyists and associations. However, it won't be able to help you. As Parnel notes, the only ticket office is now out at YOW.