^ You know, at first, my reaction to your comment on the core's thinness was that I think you may have actually meant the tower's footprint - total area of the building that will touch terra firma. However, my first reaction was wrong.....looked at a bunch of cores, and the standard for new construction (last decade or so) tall, rectangular composite structure office towers in Chicago is for the core to be (I'm sure I could have tracked down actual measurements as well, just eyeballed some floorplans) 4 'elevators wide'. 150 is just 3 'elevators wide', so indeed, definitely a thinner core than your average office tower, which of course even makes the visual impact of the lower part of this building all the more dramatic....
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It's simple, really - try not to design or build trash.
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