Regional Government of Madrid (Old Post Office Building)

This impressive 18th century building (constructed between 1766 and 1768, during the reign of Charles III) is an outstanding monument in Puerta del Sol Square. It is currently home to the Regional Government of Madrid, although it was originally the Post Office building. Designed by French architect Jacques Marquet, it has a rectangular floor plan and there are two large patios in the interior. The façade is in white stone and brick, with a large main central doorway with balcony above, and a high relief with Charles III's royal coat of arms.