| Charles Rohault de Fleury - Architect | Designed the hotel in 1867. |
| Anne-Marie Adèle Caussin (Madame de Cassin) - Sponsor and owner | First owner, marry the Marquis. |
| Marquis Landolfo de Carcano - Owner and collector | Owns works by Rembrandt, Rubens. |
| Jacques Hittorff - Urbanist architect | Author of the hotel project. |
| Napoléon III - Sponsored Emperor | Ordone the work of the Star. |