During the first half of the 17th century, the population of Paris nearly doubled, reaching 400,000 at the end of the reign of Louis XIII in 1643.[62] To facilitate communication between the Right Bank and Left Bank, Louis XIII built five new bridges over the Seine, doubling the existing number. The nobility, government officials and the wealthy built elegant hôtels particuliers, or town residences, on the Right Bank in the new Faubourg Saint-Honoré, the Faubourg Saint-Jacques, and in the Marais near the Place des Vosges. The new residences featured two new and original specialized rooms: the dining room and the salon.