The Seattle Space Needle and the Calgary Tower

https://en.wikipedia.org/wiki/Space_Needle 1962

Antenna spire	605.00 ft (184.404 m)
Top floor	518 ft (158 m)

https://en.wikipedia.org/wiki/Space_Needle#Architecture

https://www.spaceneedle.com , https://www.spaceneedle.com/webcam

https://upload.wikimedia.org/wikipedia/commons/f/fa/Aerial_Downtown_Seattle_November_2011.jpg

https://www.seattlepi.com/seattlenews/slideshow/Towers-that-resemble-the-Space-Needle-115913.php

https://www.king5.com/article/entertainment/television/programs/evening/the-tallest-tower-in-north-america-dwarfs-our-space-needle/281-b7329809-15a8-4d9c-8dcf-07a0589df22b

 https://en.wikipedia.org/wiki/Calgary_Tower 1968 

Antenna spire	190.8 m (626 ft)
Roof	171 m (561 ft)
Top floor	157.6 m (517 ft)

https://en.wikipedia.org/wiki/Calgary_Tower#Later_history

https://www.calgarytower.com/

https://everydaytourist.ca/globe-trekking-international-travel/2015/9/4/seattle-vs-calgary

https://upload.wikimedia.org/wikipedia/commons/1/1f/Aerial_Downtown_Calgary_2021.jpg

Both 600+ft. towers were possible in the 1960s, because they didn't have anything like the extremely restrictive Vancouver height limits. In the 1960's, no building was even allowed to reach 400 ft.

Seattle https://skyscraperpage.com/diagrams/?searchID=107972617&offset=50 , https://skyscraperpage.com/diagrams/?cityID=27&status=15 , https://skyscraperpage.com/diagrams/?cityID=27

Calgary https://skyscraperpage.com/diagrams/?searchID=107972625&offset=25 , https://skyscraperpage.com/diagrams/?cityID=3&status=15 , https://skyscraperpage.com/diagrams/?cityID=3

Vancouver https://skyscraperpage.com/diagrams/?searchID=107972642&offset=50 , https://skyscraperpage.com/diagrams/?cityID=1