In 1918, Trinity and Zion merged as Bethany Lutheran, where they met in Zion's church building. In 1936 Bethany merged with First Lutheran, thus becoming the United Lutheran Church of Grand Forks. In September of 1927, the installation of Rev. Ingvoldstad was broadcast over the radio, initiating one of the longest radio ministries in the country, continuing to this day.
Construction for a new church building to house all three united synods began in 1931 under the direction of regionally famous Joseph Bell DeRemer and his son, Samuel. The building was finished in 1932. Throughout the 1960s, the church saw extensive additions and renovations made. Following the 1997 Red River flood, the church had to once again be restored, having been damaged, yet not enough to warrant demolishment.