Obvious concerns, such as when a firefighter entering a high-rise building loses communications with his team because tall buildings are not conducive to radio wave transmission and therefore do not allow firefighters' radios to work properly has not been addressed during the recent trend of building higher and higher.

Even something as simple as an external fire on a high-rise cannot be defended with the conventional firefighting techniques used throughout history. Unless helicopters or airplanes are deployed, a simple fire on say the 75th floor could wreak havoc. These concerns regarding safety and building size were logged from fire service representatives long before September 11th. As early as 1995, retired Fire Chief of the FDNY, Vincent Dunn wrote that the World Trade Centers were lacking proper evacuation avenues and that if the buildings ever encountered a serious fire, existing procedures would be useless and that people above a certain threshold...
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