Swelldom Building, also known as Sun Drug Company Building,[2] is a historic three-story building located at 559 S. Broadway and 305 W. 6th Street in the Jewelry District and Broadway Theater District in the historic core of downtown Los Angeles.

[3] In 1979, the Broadway Theater and Commercial District was added to the National Register of Historic Places, with Swelldom Building listed as a contributing property in the district.

[1] Swelldom Building features an Italian Renaissance design and was built with reinforced concrete and a glazed terra cotta facade.

The building originally had a cast iron roof trim, but it has since been removed.

[1] Bays are used to define the building's repeating architectural elements.