In 1784, it changed hands again when it was acquired by the wealthy merchant Pierre Peschier. He was from Geneva but had come to Denmark in 1768 where he had initially worked for Frédéric de Coninck before starting his own trading house. In the Great Fire of 1795, which began at Gammelholm, Peschier's house was one of the first buildings to be destroyed. Peschier commissioned royal architect Caspar Frederik Harsdorff to design a new house which was completed in 1798. Peschier celebrated the inauguration of his new house with great festivitas, attended by members of the royal family. The crisis years of the 1800s, with the British bombardments of Copenhagen in 1801 and 1807, were, however, hard for his business and in 1811 he had to sell his mansion.