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. 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. (wikipedia.org)