How did I come across it? The Sydney Morning Herald has given its archives for 1955-95 a huge makeover and provides more thorough search results on anything that one wants to find. Simply playing around with the upgraded features gave me access to articles that I would not have found under the old website.
I had thought that the first World Square scheme was from 1973, but getting to where it is now was a process that spanned forty years, not the thirty or twenty years that I may have once thought.
The idea for a tower built above Anthony Horderns was a simple idea, and was seen as a way of trying to renew the southern end of the city, which newspapers were highlighting that year. It went as far as reporting that it was unsafe to venture in the streets around there. The plan included three floors of underground parking, five floors of retail, 31 levels of office space and three floors of apartments at the top of the building.
It could have been the best of both worlds, but I think the 38 storey tower would appear dated against other city buildings, not to mention the fact it might have warranted a heritage listing today as one of the first major highrises down that end of the city.
They were optimistic that it wouild be ready by 1968.
Source: Johnson, B. 1965. "A green light for up-town Sydney". The Sun Herald, September 26, 45.