My wife and I liked to eat at "The Top of the Triangle" too.While I was born into a poor family my uncle was a past CFO of USS and was a good man. When I decided to move back to Pgh I stayed with him and my aunt while I started my new job in banking. He took me to lunch one day to the Top of the Triangle and when we got off the elevator there was a greeter who greeted him knowing his name. I was so impressed and in awe of the moving restaurant.
This was 1983 and the triangle was theee place to go. Great building!
Mom worked there from opening to 1998 for Chem division that was then Aristech Chem,Sunoco,and changed another time or 2.
28th floor and you could still feel it sway lol.