The International Style office tower was built by Peter Dickinson, with associate architects Ross, Fish, Duschenes and Barrett, and was the city's tallest building from 1962 to 1963.

Part of the fire-damaged Windsor Hotel was demolished to make room for construction, with the remaining portion being converted to offices in the 1980s.

The Imperial Bank abandoned its concurrent plan for a new head office at 612 McGill Street; that building was instead occupied by Crédit foncier franco-canadien, and since 1988 by Quebecor.

Its façade is more ornamental than that of the average International style tower, with horizontal strips of glass curtain wall alternating with spandrels of various types of stone, including green slate that was quarried in Wales.

The top 7 m (23 ft) of the tower are actually an open-air raised partition, built sometime after construction, that hides the rooftop elevator control rooms.