The construction of the Janssen building commenced in June 1990 on the northeast corner of Main and Jefferson Streets. The site was formerly occupied by the Niagra Hotel and a downstairs night spot known as "The Combo Club." Most recently, the premises were occupied by Jim's Steakhouse and Potter Anderson Jewelry, however, a fire destroyed those businesses in 1986 and the site remained vacant until the ground was broken for the Janssen Building.
The general contractor was Becker Brother's Construction and the Architect was Burns and Associates. The interior design is primarily the effort of David Haase.
The interior features cherry wood, brass, marble, and granite.
The law offices of Jay H. Janssen occupy the first three floors and Jim's Steakhouse returns to the site with their elegant restaurant in the lower level.
Artwork from all over the world is featured though out the law office. A special note is the portrait in oils of Mrs. Janssen on the first floor by William Hardin of Peoria, Illinois.