Back in 1988 there was much consternation as Westmount Square was renovated. As part of the renovations, the Travertine was removed from the plaza and replaced with granite. If I remember correctly the excuse used was that it wasn’t able to stand up to the extreme weather here in Montreal.
They started to build Westmount Square in 1965. So the travertine was about 23 years old when they replaced it. The granite 24 years old this year. It isn’t doing much better. I think they should redo it and replace the granite with travertine.
And while they are at it, get rid of the skylights, and bring the fountain back.