21-25, St John Street

This building is a row of three townhouses, now used as offices, dating from the late 18th century and altered over time. Constructed of red brick in Flemish bond with some sandstone dressings, it features a slate roof. The layout is double-depth, with each house being single-fronted and having various extensions at the back. The structure stands three storeys tall over cellars and consists of six bays, with a plinth, a first-floor sill-band, a plain frieze, and a modillioned cornice. Each house has two bays.

The doorways are round-headed and have set-in doorcases with slender engaged Ionic columns and Greek-key friezes, along with semi-circular fanlights. The windows are primarily four-pane sashes, except for those on the second floor, which are six-pane sashes with shallow upper leaves. The first-floor windows have shallow panelled aprons, while all windows feature raised sills and flat-arched heads. The roof is topped with large lateral chimney stacks that cross the ridge. The interiors were not inspected. This row matches Nos. 11 to 17, forming the west end of a terrace that is uniform, except for No. 19.