At the time of its construction (1965), the Tour de la Bourse was the tallest concrete structure in the world. The project was financed mostly by Italian financiers, which explains the choice of Luigi Moretti, an Italian (also known as the architect of the Watergate Complex) as the main architect (Pier Luigi Nervi was the engineering architect).
Note that the shape of this elegant tower is not quite that of a straight box: its sides are slightly rounded. The recesses of some of its floors and the four columns dressed in concrete also give this tower a unique look.
The lower floors of the building house the Bourse de Montréal (an exchange specializing in derivates).