Van Dievoet furnished the hotel's original 108 rooms in the Louis XV style, with luxurious amenities such as hot water and electric chandeliers.

For the wedding of then-Prince Philippe and Princess Mathilde in 1999, King Albert II and Queen Paola organised a grand reception in the hotel.

[10] The architect Francis Metzger (from MA² - Metzger and Associates Architecture atelier) was appointed to lead the renovation and restoration of the historic hotel,[11] as well as its extension in five adjacent buildings (one of them was demolished in 2010 to become a new wing of the hotel).

[13] The restoration work resumed under the direction of Francis Metzger and a team composed of the architects Monica Marteaux and Frederic Huwaert.

[18] The establishment also houses Corinthia Spa by Sisley, a 1,200 m2 (13,000 sq ft) spa and wellness centre; expanded modular meeting rooms complete with technological equipment; a Palm Court lounge; Under the stairs, a bar created by the mixologist Hannah Van Ongevalle; Palais Royal, a gourmet restaurant by the Michelin-starred chef David Martin; Le Petit bon bon, a gourmet brasserie by the chef Christophe Hardiquest; Coutume, a concept store of Belgian luxury brands; as well as a private members' club.

In the guestbook, many famous personalities can be found: heads of state and prime ministers like Adenauer, Ben-Gurion, Churchill, Eisenhower, Edward Heath, Édouard Herriot, Hirohito and the Shah; artists like Dalí; writers like James Joyce and Marguerite Yourcenar; actors like Pierre Fresnay and Gérard Philippe; singers like Maurice Chevalier; and musicians like Khachaturian, Menuhin, Oistrakh and Rubinstein.