The Council on Tall Buildings and Urban Habitat said that it is possible to build a tower that can stretch up to 1.24 miles high. But building at such a height could impose many structural challenges, says Dr. Sang Dae Kim, the council's chairman. "There might be constraints for the structural engineering -- we don't know many things," Kim said. "When you go up to one of two kilometers, we don't have much information surrounding the wind conditions."
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