Quote:
Originally Posted by uaarkson
 The "national height limit" is a myth. Structures taller than 2000 ft. need special approval from the FAA, not an "act of congress."
As far as the gentleman's agreement goes, forget about it. As soon as building taller than 1WTC is profitable, you'll see 2000 ft. towers in Manhattan. Did you forget what kind of people operate down there?
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There is, in fact, a national height limit of 2,000' imposed by both the FAA and FCC; it can be challenged and exceptions can be made for specific structures (notably TV towers), etc., but the justification behind the argument must be solid and introducing new layers of bureaucracy would turn many developers away. As for the FAA,
every tall structure must be approved by them - it's the reason buildings have aircraft warning lights, and why there are different types of aircraft warning lights dependent on where a building is situated within an active flight path. (solid red, flashing red, white strobe).
As for the "gentleman's agreement", we will just have to wait and see. My gut instinct is that the IMPORTANCE of this memorial will establish one. Philadelphia had a similar "unofficial" height limit for the longest time; then the city finally came around in the 1990s. And really, who would want to be the villainous developer to propose building taller than America's beloved "FREEDOM Tower?" Just imagine the bad press.
Admittedly, there are many dynamics at play here (including market demand), but I wouldn't count on a supertall to surpass 1WTC in Manhattan anytime soon. That being said, will 1WTC eventually be eclipsed? Of course, I'm sure of it... but IMO not in this generation.