15, Upper Grosvenor Street W1

No. 15 Upper Grosvenor Street is a terraced town house built in 1732 and raised in the early 19th century. The front was enhanced by Thomas Cundy II between 1863 and 1864. The building is constructed of painted brick with stucco and stone details, topped with a slate roof. It stands four storeys high, with a basement and a dormered mansard. The facade is three windows wide, framed by rusticated quoin pilasters. The entrance is located to the right and features a Doric portico-porch. The windows are recessed sash types with stucco architraves, and those on the first floor have cornices above. There are stucco string courses and plat bands, along with a stucco crowning cornice with a blocking course. The first-floor windows are adorned with stone balustered balconettes, and there are cast iron area railings.

Inside, the house retains several original 18th-century features, particularly in the panelled ground floor front room, which has a modillion cornice and a chimneypiece. The staircase, dating from around 1800 to 1820, has stone treads and an S-pattern iron balustrade with anthemion ornament, leading up to the first floor, though it is not in the original front compartment. There is an early 19th-century rebuilt secondary stair from the first floor. Other rooms display ornate Victorian and Edwardian decorations, but the two front rooms on the first floor feature impressive early 19th-century marble chimneypieces, with the main room's chimneypiece decorated with sphinxes in the Directoire-Empire style.