With the New Castle, Duke Carl Eugen von Wuerttemberg (1744 - 1793) had the last large Baroque residence castle facilities in Germany built. He demanded from the city and the Wuerttemberg representatives of the orders that they build a "proper residence which is convenable to his royal dignity and the amplitude of his royal household" because he wanted to make Stuttgart to a second Versailles.The cornerstone was laid on 3 September 1746. The building master was Leopoldo Matteo Retti, a nephew of Donato Giovanni Frisoni, the builder of the castle in Ludwigsburg. Between 1746 and 1751, Retti built the main building, the so-called Corps de Logis and the garden wing. In doing so, he used the contemporary architecture of France as an orientation.Around the middle building, forming a horseshoe shaped court of honor, the two side wings were attached. The three-winged facility is a typical representative of its time. The only adornments on the plain façade are the sculptures on the balustrades. After the death of Retti, Philippe de la Guêpière continued the construction. By 1756 he had completed the city wing in the building shell and added a dome to the middle building in 1760 and by 1762 created the Rococo decorations in the garden wing and partially in the Corps de Logis.