Deer Park United Church began in 1881 as Deer Park Presbyterian Mission, and the first building was constructed on the northwest corner of Yonge Street and St Clair, now home of an office tower containing several radio stations, including CFRB, 99.9 Mix FM and 97.3 EZ Rock. In 1913, a building was erected at 129 St. Clair Avenue West in Toronto. It was one of two United churches in the area and along St.