Following her husband's death, wife of late August Potocki, Aleksandra for 25 years maintains the palace and the amassed collection. She initiates conversion works in the Banqueting Hall located on the second floor of the palace, giving it an all new décor. She also commissions construction of the Lapidarium and the Etruscan Cabinet which from now on houses an impressive collection of antique ceramics. The conversion is designed by Leandro Marconi.