New York City, New York story
A Steel Skeleton
In 1903, Andrew Carnegie built his mansion at 2 East 91st Street, and while it looked like a classic estate, its bones were cutting-edge. Designed by Babb, Cook & Willard, the res…
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In 1903, Andrew Carnegie built his mansion at 2 East 91st Street, and while it looked like a classic estate, its bones were cutting-edge. Designed by Babb, Cook & Willard, the residence was the first in New York City to feature a steel frame and central heating. This was a bold engineering leap for a residential home, blending the luxury of the Gilded Age with industrial-strength technology.
It transformed a semi-rural area of the old Common Lands into the sophisticated neighborhood we now know as Carnegie Hill. While the exterior reflects a timeless elegance, the real story is hidden in the walls—a steel skeleton that set a new standard for how the city's wealthiest residents lived and built.
Updated June 2026