After the death of Ali Khan on May 12, 1960 in an automobile accident, his body was temporarily interred in the villa's garden while waiting for the construction of a mausoleum in Syria (the remains were only transferred from the villa in 1972). In 1979, the heir to the Saudi throne, the future King Fahd, acquired the villa The Saudi royal family kept adding new buildings to the original one, changing thoroughly its appearance. According to the study published in 2004 in the magazine "In situ" (publication of the ministère français de la Culture), the château de L'Horizon is "one of the masterworks of Barry Dierks." Here, the architect created an imposing complex of buildings – all standing in perfect harmony with one another – consisting of a main building of four stories, annexes, a private port, and gardens designed by Dierks himself – which was a hallmark of the architect. The property, which is wedged between the "Route du bord de mer" (D 6098) and the coast, extends along the coast. Dierks utilized this topography to design a long building of which nearly all of the rooms open to the sea and the horizon, hence the name of the villa. For this reason, the entry façade – visible from the roadway – has very few openings: Frédéric Mitterrand speaks of a "forbidding view from the roadway and the railway tracks" but a sumptuous approach from the sea. Seen from the coast, the extended line of the main building seems to be constructed on the jagged pink rocks. The villa consists of a central corps surrounded by two short wings, all of which are set on a terrace. On the eastern side of the villa, a recessed wing opens, whose joining to the main building forms a square tower. The façades are of white stucco and pierced by numerous openings which create covered arcaded galleries. The property being on a downward slope, the entry level is on the first floor of sea-side of the villa (the gardens, swimming pool, and the "salons frais" (garden rooms) are on the ground floor). The entry level is given over entirely by the reception rooms and service areas. The upper floor includes ten bedrooms and seven bathrooms. On the uppermost floor (3rd floor from the entry; 4th floor from the sea-side), which has direct access from the terraces, is a salon and an arcaded loggia  The swimming pool, of a size uncommon in 1932, is a long rectangle that extends the length of the main building parallel with the coast and overlooks the sea.