Electricity Supply Board — Mount Street Upper

End-of-terrace three-bay four-storey former house over basement, built c. 1810 as one of terrace of five, having full-height glazed rear extension of c. 1980 (shared with adjoining buildings). Extensively remodelled and in use as offices. Replacement pitched slate roof to front span, hipped to east end, having brick parapet with granite coping and parapet gutters. Shouldered brick chimneystack to west with terracotta pots. Flemish bond red brick walling, with recent wigged pointing, on masonry plinth course over painted smooth-rendered basement walling. Square-headed window openings, diminishing in height to upper floors, with patent reveals and granite sills. Replacement timber sliding sash windows with convex horns, nine-over-six pane to first floor, three over-three pane to top floor, three-over-six pane to basement with wrought-iron grilles, and six-over-six pane elsewhere. Round-headed doorway with stucco surround comprising engaged panelled pilasters with Adamesque Ionic capitals, stepped entablature with swags and rosettes to frieze, sidelights with oval-and-bar-motif, and having replacement peacock's tail fanlight, and eight-panel timber door with beaded muntin and brass furniture. Inclined granite entrance platform with cast-iron boot-scrape (broken). Basement area enclosed by wrought-iron railings on moulded granite plinth, with decorative cast-iron posts. Plainly detailed door opening beneath entrance platform. Rear enclosed by late twentieth-century buildings.