I bet the addition of those slipforms on the side really helped speed things up. Now that they're out from between the confines of the adjacent buildings, they can more easily move those forms up. It also probably helps to have consistent floor plates for several floors as well. It makes sense that the first 10 or so floors took so long, with the irregular setbacks, changes to column spacing, and the confines of the adjacent buildings. Not to mention going purposefully slow as they waited for financing.
Still, 2 floors a week is unusually fast. I'd imagine it'll slow a bit from that pace when they hit the next setback, and have to build the formwork for those curves.
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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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