21 Lanark Road, Rosebank

21 Lanark Road, Rosebank is a former school building dated 1876, featuring later alterations and additions. It is a single-storey structure with an attic and has a four-bay rectangular plan that is asymmetrical. The building is situated on land that rises to the northeast and has a prominent machicolated wallhead stack on the right side. The exterior is constructed from stugged and snecked cream sandstone ashlar, with polished and droved dressings, a base course, overhanging eaves, and exposed rafters. The windows have long and short surrounds with chamfered reveals, and the corners feature long and short quoins.

On the southwest (principal) elevation, there is a gabled doorway located to the left of the center. This doorway has a roll-moulded, point-arched doorpiece with a bracketed acanthus lintel, and beneath the arch, there is a foliate carved circular panel with the initials JHC, along with flanking small circular panels that are dated. The door itself has been replaced with a boarded door, and there is a small-pane vestibule door behind it. To the outer left, there is a bipartite window, with a gabled dormer window above. In the bay to the right, there is a three-light window that breaks the eaves, and to the outer right, there is another bipartite window with a gable that also breaks the eaves, featuring a trefoil motif below the gable. A shouldered wallhead stack is positioned between the bays to the right.

The northeast (rear) elevation is irregularly fenestrated, featuring two bipartite windows in the center, with a piend-roofed addition to the outer left and both piend- and flat-roofed additions to the right.

The southeast (side) elevation consists of a two-bay gabled wall. In the center of the gable, there is a tall garage opening with a replacement door, and above it, a three-light window. A quatrefoil motif is located beneath the gable apex. To the right, there is a roll-moulded, basket-arched doorway that is slightly recessed, flanked by a window and featuring a boarded door.

The building has timber casement windows and modern roof lights at the rear. The roof is covered with grey slate, with slate also used on the additions. Ashlar coped stacks are present on the southwest and northwest sides, and there are cast-iron rainwater goods, some of which have been replaced with uPVC at the rear.

The interior was not seen as of 1997. The boundary wall and railings consist of a sandstone rubble wall topped with a ridged ashlar cope, accompanied by decorative wrought-iron railings.