That article mentioning the "superstructure" has been updated, and it looks like there might not actually be any extra height/superstructure/mystery spire planned for the tower:
Quote:
Asked about the Wilshire Grand, the communications
team for the Transbay Joint Powers Authority at first stuck to its position that the Transbay tower will be taller. Spokesman Adam Alberti even claimed San Francisco's new skyscraper will be significantly higher than 1,070 feet. He later acknowledged this was incorrect.
Alberti said the authority is not concerned with bragging rights, just a well-conceived project: "If that ends up with us having the second-tallest tower in the west by some standards, I don't think anyone will lose sleep over it."
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http://www.mercurynews.com/san-mateo...est-skyscraper