In 1775, Wyatt was sacked from the project and his competitor Robert Adam, one of the most celebrated architects of his day, was appointed to complete the interior of the house in the sumptuous Neo-Classical style. N° 20 Portman Square is acknowledged as Robert Adam’s finest surviving London town house. The interior is conceived as a series of grand reception rooms, beginning with a typically austere hall, leading to one of the most breathtaking “tour de forces” in European architecture; Adam’s Imperial staircase, which rises through the entire height of the house to a glass dome, revealing the sky above.
On the ground floor are the Front Parlour and Eating Room, the latter being decorated with symbolic paintings of banquets and the harvest by Zucchi, the husband of artist Angelica Kauffman. On the first floor is a series of ‘Parade Rooms’ featuring the Ante-room, the Music Room, the Great Drawing Room and finally, one of the most original rooms in England, the Countess’s Etruscan State Bedroom, whose pagan decorations derive from the excavations of Pompeii.