The Green Prairie Cheese Factory was located just north of the Green County line, in the southeast corner of Dane County, on County Road JG and Lee Valley Road in Perry Township. The factory made Swiss and brick cheeses and topped production in 1946, producing a total of 147,987 pounds of Swiss cheese.  Albert Marty was a cheesemaker in the early 1900s, and Rudy Willborn, as cheesemaker assisted by Sanford Gilbertson in the 1940s. A fire, discovered by William Arn, cheesemaker, was believed to have started by a spark from the boiler and destroyed the factory and $10,000 of stored cheese. 

Karlen & Sons Ford dealership and Karlen Hall — Leon A. Voegeli first entered in the car business in 1916 selling Ford cars. On June 6, 1918, the firm of H.L.Karlen & Sons, a partnership, was formed by Herman L. Karlen and his sons, Royal W. Karlen and Cloyance W. Karlen to purchase the Ford dealership from Leon A. Voegeli and Ray “Pat”Schoonover, who had both been inducted in the army. The dealership at that time was located in a small building at 110 E. Highland Ave, Monticello. In spring of 1919, land was purchased at 120 W. North Ave and an one story “modern reinforced concrete and brick” building was constructed. A second floor recreation center was added in 1920. Mr. and Mrs. H.L. Karlen took over the management of Karlen Hall which was soon known far and wide for its movies, dances and as a basketball center. Royal “Barney” Karlen Jr. joined the Karlen & Sons Ford in the 1950’s. In 1995, Steve, Dan, & Jack Stenborten, grandsons of Leon Voegeli, bought the Ford dealership back from Barney Karlen Jr. As Jack Stenborten stated, “It passed third generation to third generation.” Today the building is owned by Gary Wirth.