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 the Tyburn Convent, a Catholic convent dedicated to the memory of martyrs executed there and in other locations for the Catholic faith. Although most historic records and modern science agree that the Tyburn gallows were situated where Oxford Street meets Edgware Road and Bayswater Road, in the January 1850 issue of "Notes and Queries", the book collector and musicologist Edward Francis Rimbault published a list of faults he had found in Peter Cunningham's 1849 "Handbook of London", in which he claimed that the correct site of the gallows is where 49 Connaught Square later was built, stating that ""in the