Reverse reads: "Ivorydale Plant" Aerial view of the Procter & Gamble Company Plant, located on Spring Grove Avenue between Mill Creek and Township Avenue, in the Cincinnati suburb of St. Bernard, which originally covered 11 acres in a section called Ivorydale. It was, and still is, one of the largest soap manufacturing plants in the world. The original plant dates from about 1885, when P&G expanded operations from their downtown location. The giant complex would eventually cover 243 acres with 120 buildings, including the 43-acre food plant built in 1911. During the 1930s, the complex was described as being a maze of utilitarian gray stone buildings, interspersed with outdoor retorts and tanks, smokestacks and railroad tracks. The campus ...