The exteriof design of the Saint Paul City Hall and Ramsey County Courthouse include vertical rows of windows linked by black spandrels, and relief sculptures; the interior is in "zigzag moderne" style with white marble floors contrasting the three-story black marble piers and gold-leaf ceiling.
The exterior consists of smooth Indiana limestone in the Art Deco style known as "American Perpendicular", designed by Thomas Ellerbe & Company of Saint Paul and Holabird & Root of Chicago and inspired by Finnish architect, Eliel Saarinen. The vertical rows of windows are linked by plain, flat, black spandrels. Above the Fourth Street entrance and flanking the Kellogg Boulevard entrance are relief sculptures carved by Lee Lawrie. The interior design in the "Zigzag Moderne" style drew its inspiration from the Exposition Internationale des Arts Decoratifs et Industriels Modernes, which promoted soft ornamentation and sensuous curves. In Memorial Hall the white marble floor contrasts with three-story black marble piers leading to a gold-leaf ceiling. 
