The company's original

The company's original Dominion Square building in Montreal was built in 1918. Capping a Montreal construction boom that began in the 1920s, the company completed construction of the expansion of its headquarters with its new 26-storey headquarters north tower in 1933. Although the head office of the Royal Bank of Canada on St. James Street was taller by several floors, the Sun Life Building was at the time the largest building in terms of square footage anywhere in the British Empire.