Cornwall Terrace

Cornwall Terrace
Location in Westminster
General information
Type	Historic building with several mansions
Architectural style	Greco-Roman
Address	Cornwall Terrace Mews, City of Westminster, London NW1, UK
Town or city	London Borough of Westminster, Greater London
Country	England
Coordinates	51°31′27″N 0°9′27″W / 51.52417°N 0.15750°W / 51.52417; -0.15750Coordinates: 51°31′27″N 0°9′27″W / 51.52417°N 0.15750°W / 51.52417; -0.15750
Groundbreaking	1821
Completed	1823
Renovated	1980

Cornwall Terrace (also 1-21 Cornwall Terrace) is a Grade I listed building of consecutive terraced mansions overlooking Regent's Park in the City of Westminster, London. It is situated at the park's southwest corner, near Baker Street, between York Terrace and Clarence Terrace, within the park's Crown Estate development. Cornwall Terrace was part of the scheme of the Prince Regent, later King George IV, to develop grand housing in Regent's Park.

Cornwall Terrace was one of the earliest buildings constructed in Regency Park, and the park's first completed terrace. Construction occurred between 1821 and 1823 by the builder and developer, James Burton. The design was by his son, Decimus Burton, though Sir John Nash was responsible for the main lines, Greco-Roman in style, and supervised construction. After the Second World War, the terrace was refurbished. It became a Grade I listed building on 9 January 1970.

Architectural features give the building a regal appearance. The ground story is rusticated, while the principal stories are of the Corinthian order. The terrace block originally consisted of 19 houses, with Nos. 20 and 21 constructed later from the south pavilion. The original design contained three main storeys, an attic storey, pavilions, mansards, and basements, as well as shallow porches, square headed doorways, shallow architraves, first floor cornices, balustraded parapets, wings with Venetian-style windows, cast iron balconies, and spearhead area railings. There are fluted shafts, well proportioned capitals, and an entablature, No. 1 was adorned with a caryatid-bow. At the westernmost end, No. 10 was provided with bow windows which continued up over two stories.