The main palatial building follows a standard Rococo plan, consisting of a large, oval-shaped hall with two halls that end in a pavilion. It is surrounded by a terrace supported on a series of arches that rises to the beletage, with a belvedere and staircases on either side. The center of the building is the White Hall, whose walls are clad in stucco marble and passed through via six French doors, flanked by Corinthian columns. The stucco work, by , Johann Adam Bauer, and Ludovico Bossi, is made up by oval-shaped windows connected by flowery garlands and topped by trophies of arms and frescoes. Above the north and south entrances into the White Hall are, respectively, the coat of arms of the Duchy of Württemberg and those of Duke Charles Eugene. The ceiling fresco was painted around 1768 by Nicolas Guibal and glorifies Charles Eugene's reign with personified virtues, flanking the Ducal coronet, triumphing over their inverse aspect as Greco-Roman deities represent highlights of the Duke's reign. Peace overcomes War, Bacchus and Ceres hold grapevines to symbolize local viticulture, and Apollo, leading various forms of art personified, celebrates Württemberg's cultural achievements. On top of the cupola is a viewing platform accessed by a hidden staircase in the north end of the White Hall. Some stone cartouches bearing statements from Charles Eugene are also found on the lower facade of the main building.