No. 9 and Attached Railings

This is a three-storey, basement, and sub-basement house, now converted into flats, completed in 1792 with 19th and 20th-century additions. It was designed by John Palmer and built by William Culverwell. The front of the house is constructed from limestone ashlar, while the right side and rear have rubble with an ashlar third floor. It features a Welsh slate, double-pile, mansard roof, hipped to the right, with coped gable walls to the left and right, along with ashlar stacks topped with early clay pots. A front staircase is present.

The exterior has a two-bay arrangement. The first floor has a six/six-sash window with crown glass in a plain reveal and stone sill to the left, alongside a porch extension to the right. The second floor mirrors this with two similar windows. The ground floor features a similar window to the left, and a door within the porch extension. The door itself has two flush panels, two raised and fielded panels, a glazed panel at the top, and a cast iron knocker, situated within a pedimented Doric doorcase. A moulded cornice and coped parapet adorns the porch. To the left side of the ground floor is a window with a timber lintel, while the right side has a recessed panel. A six/six-sash window is positioned at the front at the first half landing, with a smaller two/two-sash at the second half landing. The basement contains a six/six-sash window, while a two-light glazing bar casement sits at the sub-basement level, sheltered by a C20 glazed timber screen. A double dormer with plate glass sashes is also present. Further details include a band course over the ground floor, a frieze, a moulded eaves cornice, and a coped parapet.

The rear elevation presents a single bay with three 19th-century plate glass, horned sashes—the left and right being narrower—with splayed reveals and continuous stone sills on each of the ground, first, and second floors. Continuous wrought iron balconettes are also visible on the ground and first floors. The mansard roof has been raised to the full third floor, incorporating two 19th-century two/two horned sashes in splayed reveals with stone sills. A six/six-sash window and an ashlar extension to the basement are additionally noted.

The interior has not been inspected.

Attached wrought iron railings with urn tops on limestone bases are present.

Historically, the property was part of an incomplete development of St James’s Square, built on land leased in 1790. A lower part of Park Street forms one of the diagonal approaches to St James's Square. A messuage was underleased to William Culverwell in 1792 for 94 years.