Mansion House with its entrance gate piers, 56-58 Princes Street including former No 60

Mansion House, located at 56-58 Princes Street, including the former No 60, is a town house dating from the late 18th century. No 56 features Ham stone dressings on cut and squared local stone, topped with a Welsh slated roof behind a parapet and between coped gables, with truncated and sealed stone stacks on each gable. The two-storey facade has three bays, with the entrance in the right-hand bay. The door surround has Roman Doric attached unfluted columns supporting a plain entablature, flanking a keyed semi-circular arched doorway (the door and fanlight are modern). There is a plinth where the heads of two two-light basement windows are visible; above this, the ground floor has sash windows without glazing bars in architraves with keystones, while the first floor features three similar sash windows in shouldered architraves without keystones (the right-hand window architrave over the door is heeled). A stone band course runs at first-floor level, topped by a dentilled cornice, and the quoins are unmarked. No 58, along with the former No 60 to its left, serves as a matching extension up to cornice level, possibly with a flat roof; the first-floor window of the former No 60 is set lower, and its doorway has a recent aluminium door and fanlight. The rear elevation and interiors were not inspected. Additionally, the truncated panelled stone gate piers at the entrance to No 56 are of interest.