To this day the building has a remarkable power in a modern city of concrete skyscrapers and oppressive traffic.

Philadelphia began to modernize, steel and concrete skyscrapers were constructed, old buildings were wired for electricity, and the city's first commercial radio station was founded.

Numerous steel and concrete skyscrapers were constructed in the first two decades of the 20th century.

Ingalls Building: The world's first reinforced concrete skyscraper.

In 1902, the world's first re-inforced concrete skyscraper was built, the Ingalls Building.

They had swapped it for a modern flat in a concrete skyscraper.

Conoco's idea was to avoid the great expense of a steel or concrete underwater skyscraper by building a hull that would float, partly submerged.

At the time of its completion, the Exchange Building was the second-tallest reinforced concrete skyscraper in the United States.

It was also the eighth-tallest concrete skyscraper in the world.

It is regarded as the first reinforced concrete skyscraper in Alabama and the Southeastern United States.