How was the Marais restored during the 20th century?

By the late 19th century, the Marais had deteriorated into one of Paris's worst slums, characterized by subdivided apartments and industrial workshops. While some initial restoration efforts were undertaken by private owners and the government during that period, a comprehensive transformation occurred later in the 20th century.1

In 1969, the municipal council approved an urban renewal scheme designed to eliminate slum conditions while simultaneously preserving the district's vibrant, workaday atmosphere and restoring its architectural beauty. This initiative proved highly successful, leading to the restoration of numerous ancient buildings that are now open to the public, such as the Hôtel de Carnavalet, the Hôtel de Soubise, and the Picasso Museum. Additionally, the Hôtel de Sens was restored after 40 years of work to serve as a library. As a result of these efforts, the area was revitalized, though property values in the district have since soared.1