11 and 12, Park Terrace

11 and 12 Park Terrace is a pair of houses with a service wing, built between 1827 and 1833. They are part of a row of six pairs of houses connected by single-storey links that now serve as garages. The houses were likely designed by PF Robinson and constructed by William Patterson for the fourth Duke of Newcastle.

The buildings are finished in stucco, topped with a slate roof and coped gables, featuring four plain side wall stacks. They have a plinth, an eaves band, and a coped parapet. The windows are glazing bar sashes with moulded surrounds, cornices on the ground floor, and bracketed sills above. The structure consists of two storeys plus a basement and garrets, with a window arrangement of four on the upper floor and two on the ground floor.

At the centre, there is a projecting double porch with a cornice and parapet, which contains two fielded six-panel doors flanked by pilasters. Each return of the porch has a round-arched window, and there is a single sash window on each side, with four smaller sashes above. The service wing, which is set back to the right, features a rusticated ground floor with a 20th-century door and two smaller sashes above that are narrower than those on the main house. This building is part of an early development scheme by the Duke of Newcastle for the Castle Park area.