Actually, the helipad is at 1090 ft., but at that point, we're really splitting hairs. The glass fin, however, rises what looks to be another 40 or 50 feet, and will be the visual pinnacle of the mass of the tower, above 1,100 ft, with the spire reaching up another 100 - 130 ft. to 1,250.
But to answer AZRAM's question, modern office towers have taller floor plates for a number of reasons. Chief of which in this tower will be to achieve some sort of LEED status. With taller floor plates, more light gets in, reducing lighting requirements, and therefore energy usage. So newer office towers tend to have higher floor-to-ceiling heights than towers built in the '30's, or even 30 years ago. Hence the difference in overall height to floor ratio.
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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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