His next venture, opening at the corner of Wilshire and Western Avenues in Los Angeles in 1923 was christened Bank of America, Los Angeles (BoA). On opening day, the bank posted an operating capital of one million dollars. Monnette's intention was to build capital for national expansion; however, over the course of the 1920s, Bank of Italy's Amadeo Giannini began buying stock in BoA, L.A. In 1928 Monnette and Giannini, agreed that a merger of both entities under the Bank of America name promised the best opportunity for all concerned. As part of the deal, Monnette sold his rights to the "Foundation Story" of the combined entity. Monnette was growing concerned about the stock and financial markets. The formal name change to Bank of America National Trust and Savings Bank. Initially, Monnette was named Co-chairman of the new BoA and made a Director of the bank. During the early 1930s, with his interests elsewhere, Monnette was made a vice president in the bank and retained his Board seat.