Which was NOT a new feature in the development of nineteenth-century skyscrapers?

Question

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Masonry and brick construction were not new features in the development of nineteenth-century skyscrapers. Skyscrapers required new materials and construction methods that would allow them to be much taller than previous buildings. Power-driven elevators, steel frames, and concrete reinforced with steel wire were all new features that played a crucial role in the development of skyscrapers.

Which Was NOT a New Feature in the Development of Nineteenth-Century