The houses were let on 99-year leases, and apart from modernisation from time to time, appear to have remained unchanged during this period. The 1862 Ordnance Survey, for example, shows that none of the houses had been extended over the gardens, and annual directories record good tenancies with no obvious gaps during which major works might have been undertaken. Most of the 18th-century houses in Hans Place were substantially rebuilt by Cadogan Estates when new leases were arranged in the late 19th century, adopting a style that became so closely associated with the district that Osbert Lancaster dubbed it "Pont Street Dutch".