https://www.reddit.com/r/vancouver/comments/1r960mq/tbt_aerial_view_vancouver_downtown_coal_harbour_c This was still a time when Vancouver didn't allow any office tower to have a 30th floor. As of 2026, no office building in Vancouver has been permitted to have a 40th floor. However, Burnaby & Surrey are planning to have their first office building over 40 stories. That's because they aren't under the extreme height restrictions that Vancouver imposes.
Seattle had its first 50 story office tower in 1969. https://en.wikipedia.org/wiki/Safeco_Plaza
https://en.wikipedia.org/wiki/Australia_Square The first 50 story office tower in Australia (1967) was possible because they don't have anything like the height restrictions in Vancouver.
Toronto had its first 50+ story office tower in 1967. https://en.wikipedia.org/wiki/Toronto-Dominion_Centre#Late_20th_century
SF had its first office buiding over 50 stories open in 1969. https://en.wikipedia.org/wiki/555_California_Street 52 stories, but the equivalent of 60 when counting all of the mechanical plant floors.
