corps de logis
Corps de logis is the architectural term which refers to the principal block of a large, usually classical, mansion or palace. It contains the principal rooms, state apartments and entrance. The grandest and finest rooms are often on the first floor above the ground level: this floor is the piano nobile.
The corps de logis is usually flanked by lower secondary wings. When the secondary wings form a three sided courtyard, the court is known as the Cour d'Honneur.
Examples of a corps de logis can be found in many of the most notable classical buildings of Europe including the Palace of Versailles, Blenheim Palace and the Palazzo Pitti.
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