Willis Jefferson Polk (October 3, 1867 – September 10, 1924) was an American architect, best known for his work in San Francisco, California.

[3] In 1885, Polk's family moved again to Kansas City, where Willis Webb Polk, the father, serving as a founding member of the Kansas City Architects Association,[4] was able to introduce his eldest son to Adriance Van Brunt, principal of the firm Van Brunt & Howe to gain more experience as a draftsperson.

Willis Polk's early career included work with McKim, Mead & White, as well as Bernard Maybeck.

[6] Though his own career was inconsistent during these years, Polk became an active and outspoken advocate for the architectural profession and the standards of good design.

In 1894, Polk led the Guild of Arts and Crafts, an organization of artists and architects, in an effort to create a Board of Public Works that would approve the design of all municipal projects.

He was a member of Mayor Eugene Schmitz's Committee of Fifty leaders who undertook ambitious plans to rebuild a world-class city.

When the exposition concluded, Polk led the effort to preserve Bernard Maybeck's Palace of Fine Arts.

He was regarded for his elegant residential work, mainly in mansions and estates, in the Georgian Revival style for wealthy and prominent San Francisco residents.

He oversaw the design of the War Memorial Opera House and Veterans Building, part of the planned Civic Center.

849 Mason Street was redeveloped into four luxury apartments called Four at the Top in 1983 by the restaurateur and wine maker Pat Kuleto.