Which of the following allowed for a dramatic increase in fenestration (window areas) in the Carson, Pirie, Scott Building?

Which of the following allowed for a dramatic increase in fenestration (window areas) in the Carson, Pirie, Scott Building? 



A) use of precast concrete
B) its cantilever construction
C) use of cast-iron framing
D) its steel-framed structure









Answer: D


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