The property at 116 North Main Street dates to 1843. Its original owners, John H. and Mariah Pirtle, sold it to Thomas Singleton on June 13, 1843, for two hundred and thirty-five dollars, and in 1846 Jacob Oldendorf bought it for one hundred and twenty-five dollars. Jacob had come from Germany in 1837 as a young man, and in this building he and his brother George operated Oldendorph Brothers, an iron plow and wagon shop; Jacob also invented an iron plowshare that was a specialty in its day. In 1847 he built a home just north of the building, and the property remained in the Oldendorf family for more than 60 years until his death in 1906. Afterward, his heirs sold it at public auction, where George A. Crocker bought 116 North Main for thirty-one hundred dollars, though its use during the Crockers' ownership is unknown. George Crocker and his wife Annie sold the property in 1919 to Theodore Horn, and in December 1930 Theodore and his wife Lizzie deeded it to John G. Horn, but Edward C. Horn, Theodore's son, took John to court, and the court ordered the property sold at public auction on April 29, 1939; John remained owner as the high bidder, paying five thousand, five hundred and twenty dollars. Under John's ownership, an auto dealership operated there for many years. After his death, his wife Louise kept the building and leased it to several businesses, including the Waterloo Launderama, owned by Charles E., Charles R., and Dr. Robert Rayot. In March 1968 the laundromat was destroyed by a natural gas explosion caused by gas leaking from a break in the main under the street and entering through underground lines, then ignited by a spark from a water heater or a light from one of the dryers. No one was injured because a man warned people to stay away after towels he was drying suddenly burst into flames. The south brick wall collapsed, most of the damage was in the basement, and fire destroyed five new washing machines and replacement parts stored there. This was the second major gas explosion in Waterloo's business district in two years. The building was then completely renovated, with the main entrance moved from the center to the right, much of the large window space filled with brick, and a new slanted roof added. After Louise Horn's death, her daughter Adele Valentine inherited the property; Ted and Allison Kirkpatrick bought it on March 1, 2000, and Darrell and Jane Gaitsch took ownership in 2009. For many years it housed the Edgar Zimmer Law Office, and it is now home to Edward Jones financial advisor, Stacy Butler.