The adoption of the "walled-city" plan for the Exposition meant the grouping of the more imposing architectural effects in the interior courts, the outer facades simply forming parts of a practically continuous wall about the whole. Inspired by Spanish architecture of the Renaissance, the intention was to keep the wall spaces in general quite bare, concentrating the decorative effects in rich "spots" at carefully chosen intervals. Thus the outer facades of the central group of palaces combine a simple general form with a series of richly ornamental portals. The architect who as entrusted with the designing of the wall and all the portals was W. B. Faville of Bliss and Faville.

Certain architectural and sculptural units are repeated throughout the central group. Each building has a low central dome, seldom seen when one is close to any of the main buildings, but adding greatly to the decorative effect from a slight distance. These domes are of Byzantine style, and are colored in harmonizing shades of green and pink. The small repeated corner domes add another Eastern touch, and are especially effective at night. The outer wall is edged all the way around with a simple cornice and a few rows of dull red tiles, distinctly Southern in feeling, and therefore harmonizing with both the Spanish and the Italian Renaissance doorways.

The Winged Victory is the fine decorative figure that crowns the gables of all the palaces of the walled-city. It is broadly modelled, massive and yet refined, and from any viewpoint stands out in beautiful silhouette against the sky. It is by Louis Ulrich.