The Irwin Conference Center (formerly known as Irwin Union Bank) was designed by Eero Saarinen and built in 1954 in Columbus, Indiana. It is currently owned and operated by Cummins, whose world headquarters is located across Jackson Street in the Cummins Corporate Office Building. In recognition of its unique and beautiful design, the resource was designated a National Historic Landmark by the National Park Service in 2001. The building consists of a one-story bank structure and adjacent three-story office annex. A portion of the office annex was built along with the banking hall in 1954. The remaining, much larger portion, designed by Kevin Roche, John Dinkeloo and Associates, was built in 1973. History Irwin Miller became president of the Irwin Union Trust Company after his father's death in 1947. Three years later, he commissioned Eero Saarinen to design a new building for the bank. The building was designed to distance the Irwin Union Bank from traditional banking architecture, which mostly echoed imposing, neoclassical style buildings of brick or stone. Miller wanted the building to symbolize the bank's progressive mission, which included offering some of the first credit cards and earliest drive-through banking. Instead of having tellers behind iron bars and removed from their customers, Saarinen worked to develop a building that would welcome customers rather than intimidate them. The structure has changed ownership twice since 2008 and is now operated by the corporate hospitality division of Cummins. Design The glass building may look simple, but like all Saarinen's projects, every aspect of the space was designed after extensive research of its use. The ceiling was designed at in height so the space would not feel oppressive. A freestanding structure for files occupies the center in the building, so that the office floor would be open and uncluttered. The colorful counters where tellers worked were equipped with removable plastic hoods when traffic demanded additional counters. A small elevator and spiral staircase gave tellers secure access to the cash vault below and two steel and glass vestibules connect the glass pavilion to the three-story office annex, where customers could transact business privately. The grid of large domes on the roof of the bank was a source of amusement for the townspeople, who jokingly called the bank a "brassiere factory". Nevertheless, they loved the building and customers increased fourfold. Landscape The bank building only occupied one-third of the site, the rear portion housed