Rosedale Hospital Company sold the station to the Minnesota Broadcasting Company in 1930. The studio relocated from the hospital to the new Wesley Temple Building at 115 East Grant Street in Minneapolis. WRHM was purchased in September 1934 by Twin Cities Newspapers, a partnership between the St. Paul Pioneer Press and the Minneapolis Tribune, and the call sign was changed to WTCN at that time. The station remained an NBC Blue Network affiliate through the network's selloff, becoming an ABC affiliate in 1945 when NBC Blue formally became ABC. The station kept the ABC affiliation until December 31, 1962. WTCN began broadcasting from a new transmitter and tower in Roseville at the intersection of North Snelling Avenue and Minnesota Highway 36 during 1935, a site that was used until 1962 when the station's transmission facilities were moved to the other side of the expanding Twin Cities metro in St. Louis Park, at a point south of what is now Interstate 394 and west of Minnesota Highway 100, using four towers. WTCN moved from 1250 AM to 1280 AM in March 1941 as required by the North American Regional Broadcasting Agreement (NARBA) under which most American, Canadian and Mexican AM radio stations changed frequencies. Forays into FM The station had an experimental FM transmitter by 1939. W9XTC at 26.05 MHz operated for several years, but by 1944, was only being activated intermittently. Local stations KSTP and WCCO also experimented with FM broadcasts around this time. Once the modern FM band was established, WTCN attempted again to broadcast on WTCN-FM 97.1 from 1947 to 1954. However, few people owned FM receivers in that era and the FM license was surrendered in 1954. Expansion into television On July 1, 1949, Twin Cities Newspapers expanded to television broadcasting with the launch of WTCN-TV on channel 4, becoming the second modern television station in the state after KSTP-TV launched a year earlier. The original studios were in the Radio City Theater building at 9th Street and LaSalle Avenue. WTCN followed its TV sister to Radio City in September 1949. WTCN-FM also moved to the Radio City location around the same time. However, WTCN-TV channel 4 was short-lived. Twin Cities Newspapers decided to sell WTCN-AM-FM and purchase a majority share of WCCO Radio from CBS three years later. The TV station's call letters were changed to match the newly acquired radio station on August 17, 1952.