source: Plainfield Messenger (Plainfield, Indiana) - issue of Thursday, October 13, 1955 - page 1, columns 5-6:
According to a newspaper article, on October 16, 1955 St. Mark's Episcopal Church dedicated its building (710 East Buchanan Street, near Hobbs Street). It was formerly the building owned by the Plainfield Christian Church, which moved to a new location in 1954. St. Mark's first started in Plainfield in November 1953, when they held their services in the Plainfield library. In October 1954, Rev. William L. Casady was named the vicar of St. Mark's.