🛠️ Invention or technique

Steel-frame skyscraper

Rascacielos con estructura de acero

Date
1885 · confidence high
Place
Chicago, Illinois, United States
Credited to
William Le Baron Jenney (Home Insurance Building, 10 storeys, 1885); Chicago School (Burnham, Root, Sullivan)
People
👤 William Le Baron Jenney1832–1907
Field
Tools

⚠️ Disputed: the sources disagree.

What it is

Building whose weight is borne by a metal skeleton rather than by its walls, which become mere cladding. It broke masonry's height limit.

The Home Insurance Building combined iron and steel; some historians consider the Rand McNally Building (1889) the first entirely of steel.

What it led to

  • Vertical city and business district (Manhattan, Chicago's Loop)
  • Curtain wall and modern architecture
  • Rising urban land prices and densification
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Sources✓ verified 2026-09-25