One Shell Square was built using a double
tube system, with a steel core and a concrete perimeter and opened for
business in 1972. The exterior of the building is clad in Italian
travertine (limestone) and bronze glass. There has been concern over the
years regarding the limestone's integrity during severe weather such as
tropical systems. Fortunately, these fears did not play out during
Hurricane Katrina in August 2005 and the building weathered the storm
with minimal damage, such as blown out windows and rain damage. The
building reopened to tenants in December 2005.
When completed in 1972, One Shell Square was the tallest building in the Southeastern United States, surpassing the Wachovia Bank of Georgia building in Atlanta. It held the title until 1976, when the Westin Peachtree Plaza in Atlanta surpassed it. It was the first southern skyscraper to surpass the 200 meter mark.