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
Tyburn Tyburn gallows were last used on 3 November 1783, when John Austin, a highwayman, was hanged; for the next eighty-five years hangings were staged outside Newgate prison. Then, in 1868, due to public disorder during these public executions, it was decided to execute the convicts inside the prison. The site of the gallows is now marked by three young oak trees that were planted in 2014 on an island in the middle of Edgware Road at its junction with Bayswater Road. Between the trees is a roundel with the inscription "The site of Tyburn Tree". It is also commemorated by