 It was under the rule of William I of the Netherlands that the street was covered and the two mansions were joined with a gallery.The newly created 'palace' received a new neo-classic facade designed by Tilman-François Suys with a peristyle in the middle, and a balcony with a wrought iron parapet surrounding the entire first floor.The street running alongside the new palace was widened and thus the "Place des Palais" or "Paleizenplein" was created.