I know, it would be fun to explore, wouldn't it? But the elevators would probably not be operational anymore, so you would have to climb many flights of stairs. Too bad they do not let the public inside...
It's such a large building to have been completely abandonded though, I've alway wondered about that. I hope it does not suffer the same fate as the nearby 34-story Hudon's Departmant Store, the largest building ever to be imploded
http://www.youtube.com/watch?v=-rcctmcxGwM

another view
http://www.youtube.com/watch?v=khD2gZkkSu0&feature=related