This isn’t specifically Niagara Falls related, but I figured I’d include it in case there is anyone interested. American Heritage has an article that talks about the history of restaurants at the top of towers:
Around 1960 John Graham, Jr., a Seattle architect best known for large shopping centers, proposed a tower with a restaurant on the top for the new Ala Moana shopping center in Honolulu. The tower soon changed to a 23-story office building, and a restaurant high up in an office building was nothing new, but this one would be different. Graham later recalled that his partner, Jim Jackson, suggested that the restaurant be made to rotate, so that diners could enjoy the entire panoramic view, from the mountains to Waikiki.
It was an intriguing idea, but not a simple one.
The article mentions the Skylon Tower in passing as it mentions several towers that are “at the top of towers overlooking unusual scenery.”