Largely designed by Lutyens over 20 or so years (1912 to 1930), New Delhi, situated within the metropolis of Delhi, popularly known as 'Lutyens' Delhi', was chosen to replace Calcutta as the seat of the British Indian government in 1912;[29] the project was completed in 1929 and officially inaugurated in 1931. In undertaking this project, Lutyens invented his own new order of classical architecture, which has become known as the Delhi Order and was used by him for several designs in England, such as Campion Hall, Oxford. Unlike the more traditional British architects who came before him, he was both inspired by and incorporated various features from the local and traditional Indian architecture—something most clearly seen in the great drum-mounted Buddhist dome of Viceroy's House, now Rashtrapati Bhavan.