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
Park Lane from a short terrace of houses approximately where now are Nos. 93–99. Tyburn Lane took its name from the former Tyburn village which had declined in the 14th century. The Tyburn gallows, or Tyburn Tree, at the end of what is now Park Lane, was London's primary public place of execution until 1783. Author Charles Knight wrote in 1843, by 1738 "nearly the whole space between Piccadilly and Oxford Street was covered with buildings as far as Tyburn Lane, except in the south-western corner about Berkeley Square and Mayfair". In 1741, the Kensington Turnpike Trust took over its maintenance, as