what are all of the tallest buildings in canada?
first canadian place, commerce court west, toronto-dominion centre, tour de la bourse, place ville-marie, tour cibc, commerce court north
during which years were they considered among the tallest?
1975-present, 1972-1975, 1967-1972, 1964-1967, 1962-1964, 1962, 1931-1962
and which of those buildings held its record for a single year?
tour cibc