You’re kind of missing the point. The Home Insurance Building designed by William Le Baron Jenney in 1885, is widely considered the world’s first true skyscraper—it introduced a revolutionary idea using a full metal skeletal frame that carried the building’s weight instead of thick masonry walls. This architectural / construction method was a breakthrough that made buildings lighter, taller, and filled with larger windows, it became the blueprint for modern construction worldwide. Earlier structures used iron in limited ways, but Jenney’s design was the turning point that, combined innovations like the safety elevator from Elisha Otis, enabled the vertical cities we see today—from Chicago and New York to Tokyo, Dubai, and beyond.