By Jared Ebersole in Video — 13 May 2026

The Woolworth Building Had to Invent a Way to Fight the Wind

When the Woolworth Building became the tallest building in the world, its engineers had to solve wind forces with a bracing system tailored to its strange shape.

The Woolworth Building looks like a cathedral because that was the point.

Frank W. Woolworth made his fortune selling five-and-ten-cent goods, then spent those nickels and dimes on a tower meant to advertise his company to the world. When it opened in 1913, it was the tallest building on earth: a 792-foot Gothic skyscraper rising over City Hall Park.

The public saw romance.

The engineers saw wind.

Where it is

Woolworth Building, 233 Broadway, New York, NY 10279.

Early skyscrapers were changing faster than the rules used to design them. Steel frames allowed buildings to rise far beyond masonry limits, but height introduced forces that did not matter as much in shorter buildings. A tall tower is not only carrying gravity loads downward. It is also being pushed, pulled, and twisted sideways by the atmosphere.

At street level, wind can feel like weather.

At 700 feet, it becomes structure.

The Woolworth Building was designed by Cass Gilbert, but its steel frame was engineered by Gunvald Aus and Kort Berle. Aus belonged to a generation of engineers who were turning skyscraper design from a rule-of-thumb craft into a more formal high-rise discipline. They were not guessing, but they were working in a period when every new record-setting building forced the profession to test its assumptions.

The Woolworth Building made the problem harder because it was not one simple shaft.

Its lower portion is broad and U-shaped, wrapping around a light court. Above that base rises a much more slender tower. The two parts behave differently. The base is wide, irregular, and comparatively stiff in one direction. The tower is taller, narrower, and more exposed. A single bracing strategy could not treat the whole building as if it had one simple shape.

So the structure was divided into zones.

In the lower floors, the building used heavy bracing to move lateral loads toward the ground. Old Structures Engineering describes the wind-bracing system as complicated because the bottom 30 stories and the top 30 stories faced very different structural conditions. The base needed to stabilize a large U-shaped plan. The tower needed to resist sway and twisting while rising far above the surrounding city.

The geometry of bracing matters because triangles do what rectangles do not.

A rectangle can deform into a parallelogram if its joints are pushed sideways. A triangle is locked by its sides. That is why diagonal bracing is so powerful in steel construction. It gives lateral forces a path through tension and compression instead of letting the frame rack out of shape.

In the Woolworth Building, the lower structure used portal bracing and triangular bracing where needed. At intervals, trusses tied parts of the building together. Higher up, the tower relied on knee braces and rigid column-girder connections to stiffen the frame against both sideways push and torsional movement.

The goal was not to make the tower immovable.

Tall buildings move. They expand, contract, sway, and respond to changing loads. The goal is to control that movement so the structure remains safe, the facade stays intact, elevators work, partitions do not crack excessively, and people inside do not feel as if the building is misbehaving.

The Woolworth Building had to do all of that while also being a piece of corporate theater.

Woolworth did not want an anonymous office block. He wanted the world's tallest building, and he wanted it to look worthy of that title. The lobby became a marble-and-mosaic showpiece. The exterior used terra cotta Gothic ornament to make a steel-frame tower feel like a vertical cathedral. Newspapers called it the "Cathedral of Commerce," a nickname that still fits because the building treated retail capitalism as something almost religious.

The opening matched the ambition.

On April 24, 1913, Woolworth hosted a dinner high in the building. At 7:30 p.m., President Woodrow Wilson pressed a button in Washington, D.C., and the tower's lights came on in New York. Contemporary accounts describe about 80,000 lights illuminating the new tallest building in the world.

It was a perfect publicity moment.

But behind the spectacle was the quieter engineering achievement: a tower whose wind loads had been studied, braced, and distributed through a steel skeleton at a scale that pushed the field forward.

The Woolworth Building held the world's tallest title until 1929. Later towers surpassed it in height and stripped away much of its Gothic ornament. The Chrysler Building and Empire State Building made the skyscraper more aerodynamic, more modern, and more symbolic of speed. But Woolworth sits at an important hinge point.

It still looks backward, toward cathedrals.

It also looks forward, toward structural systems that made much taller towers possible.

That is why the building's prettiness can be misleading. The gargoyles, pinnacles, pointed arches, and lobby mosaics are not the whole story. Under the ornament is a steel frame solving the problem every skyscraper has to solve: how to stand upright when the wind tries to make height behave like a lever.

Woolworth bought a monument with nickels and dimes.

Aus and Berle made sure the monument could survive the sky.