Chandos House is a grade I listed building at no.2 Queen Anne Street, Marylebone, in central London. It was designed by Robert Adam, the most prominent architect in Georgian Britain, and built by William Adam and Company. It is seen as the first of a series of large townhouses in London including 20 St. James's Square and Derby House. The house was built speculatively with monies from the Adam family and from the banker Sir George Colebrooke, later to be an Adam client himself. It was started in 1769 and finished in 1771 on a plot between another Adam house to the west, and the garden wall of Foley House to the east, on land which was part of the Duke of Portland's estate.