While doing research for a documentery on the Utah Governors Mansion, I learned that for nearly 25 years, the Mansion housed the Utah State Historical Society. In the late 1950's Governor J. Bracken Lee decided the Mansion was unfit to serve at the Governor's official residence. The building was 55 years old and hadn't seen many updates over the years. In 1973, the Mansion was used as a set for a horror film titled "The House of Seven Corpses."
The Utah State Historical Society has a number of great images showing the Mansion in use during those years. Archival documents were stored in the basement and bedrooms were used for offices and reading areas.