Taking a good look at those renders of the base, I'd wager that it'll be a little while before we really see this thing take off vertically. That double-height floor on the east and north side of the base looks like it's supported by really wide spans between the columns, which will probably have to be encased in concrete. And while they don't necessarily support the rest of the tower, they probably bear some small percentage of lateral loads, so they'll probably case those columns in concrete before moving vertical with the regular tower floors, like they did with the floors below it.
Just my two "armchair engineer" cents.
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"Then each time Fleetwood would be not so much overcome by remorse as bedazzled at having been shown the secret backlands of wealth, and how sooner or later it depended on some act of murder, seldom limited to once."
Against the Day, Thomas Pynchon
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