The building with its pyramid shaped roof is prominently featured in the center of photos of the Gateway Arch from the Illinois side as its location on the Memorial Plaza is lined up in the middle directly behind the Old Courthouse.

The pyramid roof on the top was designed to resemble the Mausoleum at Halicarnassus which was one of the Seven Wonders of the Ancient World.

[3] The roof is made of cast aluminum and is topped by two 12-foot (3.7 m) high sphinx-like structures with the fleur-de-lis of St. Louis adorned on the chests.

[5] During St. Louis PrideFest, the building has lit its columns up in a rotating rainbow pattern.

In 2016, the top of the building lit up with 49 purple lights to show solidarity to the victims in the Orlando nightclub shooting.