A bronze tablet was unveiled honouring Avenue Road Presbyterian Church parishioners who served in the First World War. The church was located at 423 Avenue Road. In 1925, it joined the United Church of Canada. In 1930, it amalgamated with and moved into St. Paul’s United Church. The new congregation was named St. Paul’s – Avenue Road United Church.
The St. Paul's United congregation moved into the Trinity United building in 1980. However, the two congregations were not formally united until May 30, 1982, when the inaugural worship service was held for the newly formed Trinity-St. Paul's United congregation.