Apsley House

Apsley House is the London townhouse of the Dukes of Wellington. It stands alone at Hyde Park Corner, on the south-east corner of Hyde Park, facing towards the large traffic roundabout in the centre of which stands the Wellington Arch. It is a Grade I listed building.

Designed by Robert Adam in the neoclassical style, the house was built for Lord Apsley in the 1770s. It was purchased by Richard Wellesley, in 1807, and passed to his younger brother Arthur, in 1817. It was sometimes referred to as Number One, London. It is perhaps the only preserved example of an English aristocratic townhouse from this period.

Source: Wikipedia