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 the depression of St James Park Lake to the river and Downing Street, the route to another mouth apparently cut across the present grid layout towards Thorney Street close to Lambeth Bridge, whilst a third route was a sewer pipe called the King's Scholar's Pond Sewer which issued near Vauxhall Bridge. River Tyburn The River Tyburn is a river in London, which runs underground from South Hampstead through St James's Park to meet the River Thames by Whitehall Stairs (near Downing Street and Thorney Street, between Millbank Tower and Thames House). It is not to be confused with the Tyburn