Notable features

The roof of Citigroup Center slopes at a 45-degree angle because it was originally intended to contain solar panels to provide energy. However, this idea was eventually dropped because the positioning of the angled roof meant that the solar panels would not face the sun directly.

To help stabilize the building, a tuned mass damper was placed in the mechanical space at its top. This substantial piece of stabilizing equipment weighs 400 tons (350 metric tons). The damper is designed to counteract swaying motions due to the effect of wind on the building and reduces the building's movement due to wind by as much as 50%. Citigroup Center was the first skyscraper in the United States to feature a tuned mass damper.
 

The building features double-deck elevators, which are separated to serve only odd or even floors. The corporate headquarters of Citigroup are not located in the building, but across the street in 399 Park Avenue.

In 2002, one of the columns was reinforced with blast resistant shields of steel and copper as well as steel bracing to protect the building due to the possibility of a terrorist attack.

The building featured in the music video for Janet Jackson's "Runaway", in which she runs up the slanted roof.