So as one of the great selling points of these condos is that in the future you'll be able to walk from one rooftop to the other, although we don't really know why you would want to do that because you've got your own rooftop anyway and it's not like your office is going to be in that other apartment building.
God knows that they'll never be employed as by glue-sniffing youth as handy places to mug well-heeled residents ambulating aimlessly from building to building.
Anyway, for what it's worth, I once wrote an article that led to the nixing of a similar construction over Notre Dame just east of Peel that was gong to be part of the ETS CEGEP project.
So yeah, there's that.
Other overhead walkways proposed in the past include one within a proposed orchestra building on McGill College that never ended up getting built and another that would have linked the Mount Royal Hotel to Simpson's, both in the mid-80s. There was another proposed for the Longueuil metro some time ago but I don't know if that ever actually got built.
Thanks to EMDX for the photopicture.