The United States National Bank Building in downtown Portland, Oregon, is listed on the National Register of Historic Places. Designed by famed Portland architect A. E. Doyle in a Roman classical style, the four-story building's first section, facing Sixth Avenue, was completed and opened in 1917. An extension westward to Broadway, approximately doubling its size, was constructed in 1925. Since then the building has occupied one-half of a city block. It features a four-story-high colonnade of Corinthian order columns at its eastern end, originally the principal façade, and extensive use of glazed terracotta. The interior is also decorated extensively with highly textured materials. The building was constructed for the United States National Bank of Portland (USNB), which ultimately became