No. 7 and Attached Railings

No. 7 is a house completed in 1792, with 19th and 20th-century additions. It was designed by John Palmer and built by Edward Clement. The front of the house is constructed from limestone ashlar, while the basement and rear are of rubble. It has a Welsh slate double pile mansard roof, a coped gable wall to the left, and two ashlar stacks with some early clay pots. A staircase is situated at the front.

The house is three storeys high, with an attic and basement and sub-basement. The front facade has a two-window range. The first floor has two six/six-sash windows with crown glass in plain reveals and stone sills. The second floor has matching windows. The ground floor has one similar window to the left, and a six-panel door to the right, featuring flush and raised and fielded panels with two upper glazed panels within a pedimented Doric doorcase. Two steps lead to a pennant-paved crossover with a cast iron footscraper. A six/six-sash window is also present on the basement level, alongside grating for access to the sub-basement. A 20th-century door is set into an ashlar infilling area under the crossover. There is a single dormer window containing a six/six-sash. Architectural details include a band course over the ground floor, a frieze, a moulded eaves cornice, and a coped parapet.

The rear elevation has three six/six-sash windows in plain reveals, a wrought iron verandah with a timber frieze featuring applied diamond decoration and a glazed roof. Three sashes are present, narrower to the left and right, with a continuous stone sill to the second floor and ground floor; the upper floor features early glazing bars. There is an extended dormer with two six/six-sashes, and a single six/six-sash to the ground floor. The interior has not been inspected.

Attached to the house are wrought iron railings with shaped tops on limestone bases.

Historically, the house was part of an incomplete St James's Square development, built on land leased from Sir Peter Rivers Gay in 1790. A lower part of Park Street forms one of the diagonal approaches to St James's Square. An underlease of the property was granted to Edward Clement in 1792 for 95 1/2 years.