Cambridge House is a Grade I listed former townhouse in central London, England. It sits on the northern side of Piccadilly at number 94, in the fashionable district of Mayfair. , the property is being converted into a luxury hotel and seven residences. The current name of the house comes from one of its former owners, Prince Adolphus, Duke of Cambridge (1774–1850), the seventh son of King George III, but it was originally known as Egremont House and then Cholmondeley House. From about 1865 to 1999, it was the home of the Naval and Military Club and was known colloquially as the In and Out Club, due to its prominently signposted one-way carriage drive. Early history The house, situated in the fashionable parish of St George's, Hanover Square, Westminster, was built in 1756–1761 by Charles Wyndham, 2nd Earl of Egremont (1710–1763), of Orchard Wyndham in Somerset and of Petworth House in Sussex, Secretary of State for the Southern Department from 1761 to 1763, and was thus first known as Egremont House. The building is in the late Palladian style, to the design of the architect Matthew Brettingham. It has three main storeys plus basement and attics, and is seven bays wide. As is usual in a London mansion of the period, the first floor (piano nobile, "second floor" in American English) is the principal floor, containing a circuit of reception rooms. This floor has the highest ceilings and its status is emphasised externally by a Venetian window in the centre. The house changed hands several times. For several years in the 1820s, it was occupied by George Cholmondeley, 1st Marquess of Cholmondeley, and was known as Cholmondeley House. From 1829 to 1850, it was the London residence of Prince Adolphus, Duke of Cambridge (1774–1850), and became known as Cambridge House. Due to his royal status, that name has persisted. As Queen Victoria left the house after visiting her dying uncle Adolphus, Robert Pate hit her on the head with his cane. After the duke's death in 1850, the house was purchased by Henry Temple, 3rd Viscount Palmerston, who was Prime Minister of the United Kingdom for most of the decade between 1855 and 1865. It was his London townhouse and the site of many splendid social and political gatherings. After Palmerston's death in 1865 at Brocket Hall in Hertfordshire, his body was taken to Cambridge House, whence his funeral procession