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Originally Posted by pianowizard
^ That's what I've heard as well, and is the reason why so many 700-to-900 footers are being proposed and constructed: apparently that's the sweet spot in terms of benefit-cost ratio. For skyscraper fans this can be disappointing, since some of the 900+ footers would be supertalls if they were just a tad taller, but most developers don't care about that, as mentioned earlier in this thread.
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Very interesting, but does the cost become prohibitive over 1000 feet if you add a crown or something of that type. You may be right though about benefit-cost ratio, maybe that is the reason some newly built or proposed New York skyscrapers are in the 50 to 60 story range but with crowns or antennas list over 1000 feet. Even so if 301 and 325 Wacker Drive twin towers had sizeable crowns atop them both, that would be awesome...