Portman Estate area remained largely residential, attracting the prosperous middle class who wanted to live near the centre of London. There were also mews for tradesmen and servants. At the southwest corner of the Estate, where Marble Arch now stands, was the Tyburn gallows, London’s principal place of public execution until 1783. Development of the area north of the Marylebone Road around Dorset Square continued after 1815, and to the North West in Lisson Green, workers’ cottages were built from 1820 to 1840. Many of the original Georgian houses north of Portman Square were redeveloped as mansion blocks, which were let on
River Tyburn Hampstead it follows Scholar's Pond Sewer south along Fitzjohns Avenue through South Hampstead (Swiss Cottage) under Avenue Road to Regent's Park. To enter the park's perimeter the Tyburn is carried in an aqueduct over the Regent's Canal then culverted. The Tyburn gave its name to the former area of Tyburn, a manor of Marylebone, which was recorded in Domesday Book and which stood approximately at the west end of what is now Oxford Street, where from late medieval times until the 18th century traitors were left following hanging. Tyburn gave its name to the predecessors of Oxford Street and Park