Paul Marmottan (1856–1932), a wealthy patron of the arts, is best known for his luxurious hotel at the Porte de la Muette, which he donated to the Académie des beaux-arts. This building was later transformed into the Marmottan Museum in 1934. Now, the museum is set to begin a major renovation starting in 2028, expanding its spaces by 1,000 square meters. In addition to the museum, Marmottan also donated his private home in Boulogne-Billancourt to the Académie, which has since been converted into a research library. This library has been expanded with a garden and a villa, creating a space for scholarly and artistic exploration. The recent renovation of the entire complex was extensive and necessary. Adrien Goetz, an art historian and academician who has directed the site for six years, said the building was in "danger" due to issues like infestations of xylophagous insects (wood-boring insects) and wall dampness. Over five years, five million euros were invested to restore Marmottan’s former home to its original grandeur from a century ago. The work was handled with care by heritage architect Jennifer Didelon, ensuring the historical integrity of the building was preserved. Inside, the salons, offices, and bedroom have been restored "scrupulously," according to Goetz, while the reception areas have been updated to better welcome visitors. The library remains accessible only to researchers, and the villa is reserved for invited artists in residence. However, the general public can visit an exhibition space dedicated to Paul Marmottan and access the auditorium, which plans to host one or two events per week, such as book presentations, conferences, and concerts. Paul Marmottan’s life and tastes are reflected throughout the building. Born to the president of the Bruay Mines Company, Marmottan could have pursued a career in administration had he not lost his father at 27. The vast fortune he inherited allowed him to fully dedicate himself to the arts, especially the First Empire style. The Marmottan Library and Villa are considered study sites or "laboratories" for this style, with each room serving as a decorative example of his aesthetic. His collection includes 6,000 prints (soon to be digitized), numerous paintings, sculptures, and luxury furniture. One notable piece is the blue silks stretched on the wall of a salon, purchased during a trip to Italy at the factories of Caroline Murat, queen of Naples. Today, researchers and resident artists can engage with Marmottan’s legacy, while the public can explore a house where the past meets the present through conferences and concerts. The Bibliothèque et Villa Marmottan continues to honor the generosity and artistic vision of its founder.