Montreal's third-tallest building; it was the world's tallest reinforced concrete tower until the completion of Lake Point Tower in Chicago in 1968. It is now the 13th-tallest building in Canada. The tower itself is considered by many to be a masterpiece of the International style of skyscraper design. Its faade, fully renovated in 1995, features a bronze-tinted anodized aluminium curtain wall, forming a strong contrast with the slightly slanted pre-cast concrete columns at the four corners, giving the whole a subtly convex aspect. It is divided into three roughly equal blocks by mechanical floors whose corners are recessed in an octagonal shape, creating small open-air interstices behind the columns at these levels.