This came out of a convo at WiredNY, after I mentioned offhand that I might recreate this as an alternate crown for my ESB model. I had lost the original NYTimes article, but DMAG over there found a scan online.
113 floors, 1,494 feet to roof:
It was more of a study by SL&H than anything else, but if the 1975 proposal had been picked up by the building owners, top out probably would have been in the early 80's.