 Concurrently, in 1817–1831, it also housed the Warsaw Lyceum, a secondary school where Frédéric Chopin's father taught French and whose alumni included young Chopin himself.The years 1818-22 saw expansion by two pavilions parallel to "Krakowskie Przedmieście", designed by Michał Kado.In 1824, the palace was thoroughly rebuilt in the classicist style to the design probably of Hilary Szpilowski and Wacław Ritschel.