56 and 57, Grosvenor Street

56 and 57 Grosvenor Street are a pair of townhouses built between 1910 and 1912, designed by Edward Wimperis and John Best in the Late Queen Anne style for the Grosvenor estate. The exterior features brown brick with some red brick and Portland stone dressings, topped with a double mansard roof made of Westmoreland slate and brick chimneystacks. The building has four storeys, attics, and a basement. The ground floor and attics each have two windows, while the first to third storeys each have one canted bay. Most windows are multipaned sash, except for the ground floor windows of number 56, which are late 20th-century top-opening casements. The attics have upper recessed sashes and lower dormers with curved pediments. A deep modillion cornice runs along the top. The second and third floor windows feature red brick dressings, while the first floor windows have Portland stone dressings. The ground floor is rusticated Portland stone with a cornice and seven stone columns. There are side doors with multi-paned rectangular fanlights and half-glazed doors, as well as cast iron rainwater heads, square drainpipes, and attached area railings.

Inside, the buildings showcase a mix of styles from the early 18th century to the Adam revival. Notable features include fine early 18th-century oak staircases with turned balusters and column newels. Number 56 retains cornices with modillions and moulded leaf designs. Fireplaces include an Adam style fireplace with a floral panel, paterae, and wheat ear drops, as well as a fireplace with an eared architrave and cast iron firegrate. Number 57 features early 18th-century fireplaces with bolection moulding and eared architraves, along with brackets and floral panels. There are also Adam revival urn and swag mouldings above mahogany doors, several moulded plaster ceilings, and fireplaces with fluted Ionic columns or plumed half-columns and panels adorned with cupids. The original water closets and tiles are still present.