The Kassel city palace was largely destroyed by a major fire on the night of 24 November 1811, during the French occupation under the Napoleonic
Kingdom of Westphalia (1807–1813). The scale and expense of the planned neoclassical building went far beyond what was typical for a princely residence. Preparatory and foundation work started in June 1817 and took a long time to complete. The ceremonial laying of the foundation stone did not take place until 27 June 1820. The complex stretched from west-northwest to east-southeast, high above the Fulda River meadow. A four-winged building, measuring approximately 50 × 60 meters, enclosed a large courtyard, and to the east, two more wings of around 50 meters each extended in a U-shape from the main building. The entire complex was intended to be three stories high. When the builder, William I, died at the age of 78 on 27 February 1821, only the first floor had been completed in its raw structure. Afterward, work was halted because his son and successor, Elector William II, preferred his palace on Friedrichsplatz, the
Residenzpalais, which he expanded and significantly enlarged by constructing the Red Palace. He had different priorities for the use of personal and state finances—primarily concerning his mistress,
Emilie Ortlöpp, and her well-being. The red sandstone from the ground floor was dismantled between 1840 and 1870 and used in the construction of the nearby
New Gallery between 1871 and 1874. ==How would the interior have looked? ==