Skyscrapers first emerged in the late 19th century as fire-resistant constructions in Chicago and New York following major fires that destroyed downtown areas. The first true skyscraper is considered to be the Home Insurance Building built in Chicago in 1885. Developments in steel-frame construction allowed buildings to rise higher. New York particularly saw a surge in skyscraper construction in the early 20th century as the bedrock near the surface and grid street pattern facilitated low-cost foundations. Zoning laws introduced in 1916 established setbacks to allow more light and air. The modern skyscraper boom continued throughout the 20th century with ever-taller buildings constructed in major cities around the world.