A cholera outbreak in 1832 killed twenty thousand people. The Comte de Rambuteau, the Prefect of the Seine for fifteen years under Louis-Philippe, made tentative efforts to improve the center of the city: he paved the quays of the Seine with stone paths and planted trees along the river. He built a new street (now the Rue Rambuteau) to connect the Le Marais district with the markets and began construction of Les Halles, the famous central market of Paris, which was finished by Napoleon III.[114]