The apartment building.
Does anyone think that this movie sort-of inspired 'Alien' four years later with the title of the building being 'Starliner' and the chest-bursting scenes? The building was also used as a background setting in Cronenburg's next movie, Rabid.
I traveled to see this very building in Montreal a few months ago this summer and was suprised to see that not much has changed in all those 30 years. The island where it is, Ile-des-soeurs (Island of Nuns), is much more built up than it was in 1975 for instead of one or two high-rise apartment buildings, there are dozens of them all over the island. But I found the right one located on the main boulevard on the southern shoreline. The swimming pool and embankment area, and probaly the underground parking garage are all still there. The only thing is that the neighborhood is an entirely French-speaking community rather than English as portrayed in the film.
I do like to travel to seen the backdrop locations for my favorite horror movies where ever they may be in the USA and even Canada as well. Strange hobby, but I like it just to be there where it was.