Posted May 5, 2017, 3:46 AM
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Urbane observer
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Join Date: Nov 2006
Posts: 4,385
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It's seldom outside forces making these decisions. Going taller doesn't always make financial sense.
You need more elevator shafts (costing you floorplate), you need stronger concrete, you have a longer construction period, you might need a tuned mass damper or additional frame stiffening. On most Chicago sites, the sweet spot seems to be between 40 and 50 stories.
Developers want to build and sell a project quickly and move on to another site, not see if they can squeeze in a few more floors for bragging rights before the next recession catches them out.
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