I like to walk in downtown Montreal and look at the different architecture. There are a number of buildings that reflect the architectural style of the early 1930s but the Sun Life Building is one of the best. It announced through its massive size (it had the most square feet of any building in the British Empire when it was completed in 1931) it announced the solidity of the Sun Life Insurance Company.
There is lots to admire with the variety of architectural features. I don't know if it is true, but one web site said that the crown jewels of England as well as bullion from the Bank of England were stored in the basement vaults during World War II. This building was built to last; it dominates Dorchester Square.