The Australia Square Tower

 Australia_Square was quite an impressive cylinder of a building when it opened in 1967.  

https://www.smh.com.au/entertainment/art-and-design/top-of-the-town-20040515-gdixds.html

https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Sydney#1960s_and_1970s

https://upload.wikimedia.org/wikipedia/commons/8/8d/70-673%2C_Sydney_1970.jpg 

The Australia_Square_Tower was the first building permitted to have 50 floors in Australia. 

Now it's just an average tall building in Sydney, even if it was in Melbourne or Brisbane. It wouldn't even be the tallest in Perth, but it would be in Adelaide & especially Hobart. 

https://en.wikipedia.org/wiki/Australia_Square#Surpassing_of_height

https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Sydney#21st_century

https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Australia#Tallest_buildings

https://en.wikipedia.org/wiki/List_of_cities_in_Australia_by_population#Significant_urban_areas_by_population

https://thedigitallabyrinth.blogspot.com/search?q=Australia+Square