text: The ninth story, the lowest level above the stilts, contains a trussed frame similar to those use in cantilever bridges, where the wind loads are transferred downward into the stilts. This story is used as mechanical space.
  The chevrons are not visible from the exterior but can be seen from the offices inside; this contrasted with structures such as Chicago's John Hancock Center in which the diagonal beams could be seen from the outside. After Citicorp Center's completion, W. Easley Hammer said he thought it was a mistake to conceal the chevrons, while LeMessurier said that Stubbins had rejected his idea for exposed chevrons. The chevrons were originally bolted to each other with over two hundred joints. Following the Citicorp Center engineering crisis of 1978, workers installed  steel plates over each joint.
  Interior
  The tower contains approximately  of rentable space. The office annex to the east contains about  of space. According to the Department of City Planning, the building has a gross floor area of , while, according to The Skyscraper Center, the building has .
  Base
  The Citigroup Center's main entrance lobby is at the middle of the Lexington Avenue frontage, across a footbridge that also provides entrance to St. Peter's Church. The main entrance consists of a double-height glass box, with steel ribs, that is  long. The lobby was constructed as part of a 2010 renovation.