[3] In 1900, the bank commissioned architect William F. Curlett to design a building for the prominent corner of Market and Kearny Streets.

[5] In 1964, Charles W. Moore was hired as the lead architect to build a 12-story reinforced-concrete annex in the Modern or early Postmodern style.

This decision was unusual during the height of High Corporate Modernism when older skyscrapers in San Francisco were being torn down and replaced.

The structure of the new building is classical, with metal fins that project out as sunscreens above the windows on the south-facing elevation.

The roof terrace of the new addition has a privately owned public space (POPOS), with a rooftop garden and views of the city.