 In 1780 the twenty-three-year-old unmarried daughter of the Prince of Condé, Louise Adélaïde, also known as Mademoiselle de Condé, requested permission to leave the convent of Panthémont, where she had been educated, to live in the world.To suit her station in life a generous site was purchased in the rue Monsieur on the Left Bank, where Brogniart erected a splendid house.Previously, while working for the marquis de Montesquiou in 1778, Brongniart had received permission to open the rue Monsieur, where he also built stables for the Count of Provence, and a "hôtel" for the Archives de l'ordre Saint-Lazare.