Stanton K. Borum and Ida Mae Borum became owners of the Leupp Trading Post in 1929, and made an addition to the original structure, thus, a two-story trading post was erected with the Trading Post on the ground floor and the residence on the second floor. William E. and Lucile McGee, who had been in the trading post business since 1923, purchased Leupp Trading Post in 1944 from Ida Mae Borum. After William and Lucile retired in 1968 their son, Ralph and his wife, Ellen, ran the Leupp Trading Post until 1982.