Their son, Francis, born in 1809, graduated from the French Académie des Beaux-Arts (Academy of Fine Arts).

He supervised the trimming of stone from the church's flying buttresses, causing dangerous structural weakness; carried out the removal of authentic ornamentation; and added the anachronistic Gallery of Kings to the west facade.

[3] In 1818–1819, he was assigned the task of transforming the former Augustinian convent in Paris into the École des Beaux-Arts, which had been revived in 1816 under the Bourbon Restoration.

In 1820 he was commissioned to design the temporary opera house, the Salle Le Peletier, in which he essentially rebuilt the auditorium of the Théâtre des Arts (demolished by an ordinance of 9 August 1820[4]).

He was replaced by Rohault de Fleury as the architect of the Opéra in 1846 and shortly after the February Revolution of 1848 was dismissed as inspector general.