For the London estate, Grosvenor created a "fashionable new residential quarter" near Buckingham House (later Buckingham Palace). He appointed Thomas Cundy as architect and surveyor, and Thomas Cubitt as builder. The entry in the "Oxford Dictionary of National Biography" states: "This urban development was to make the Grosvenors one of the richest families in Britain". He also bought more property in Cheshire, and elsewhere at Shaftesbury in Dorset, and Stockbridge in Hampshire. The family's London house had been in Millbank, but in 1806 Grosvenor bought a house in Upper Grosvenor Street and greatly extended it; this was to become Grosvenor House. He added an art gallery to the Park Lane side of the house in 1827, and in 1843 built a new entrance in Upper Grosvenor Street consisting of a Doric screen between large pedimented gateways that separated a "cour d'honneur" from the street in the Parisian manner.