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New and stronger concretes have become the standard material for very tall buildings, particularly residential buildings, where structural stiffness is important for the comfort of occupants. In this interview, Paul James, Senior Vice President with Lendlease U.S. Construction in Chicago, talks about the tradeoffs in design and materials selection as a function of use of the structure, the rate limiting factors in the construction of tall concrete and steel buildings, the effects of weather on construction speed, and the role of the construction engineer in material specification