Greenbank, 20 And 22 Green Street, Bothwell

Greenbank is a Greek-detailed villa with Italianate tower, built around 1855 by Alexander Thomson and John Baird, with later alterations and additions. The building is now divided and comprises a single-and-two-storey, asymmetrical six-bay design, with a three-stage tower at the rear. Shallow gable bays flank a flat-roofed entrance positioned centrally, with a single-storey, flat-roofed addition to the left and a two-storey, pitched, harled stair addition to the rear of the tower.

The exterior is constructed of stugged and snecked red sandstone, with squared rubble to the rear. Polished ashlar dressings are present, alongside tooled surrounds to droved openings. Pilaster mullions feature square capitals, with plain mullions at ground level to the centre and the addition. Plain bargeboards, an eaves course beneath the gables, and exposed rafters complete the exterior detailing. The tower has a cill course to the third stage, an eaves course, and deeply overhanging eaves.

The northwest (principal) elevation features a single-storey entrance porch to the right of centre, supported by pilaster capitals with a curvilinear incised frieze and toothed cornice. It contains a three-leaf timber panelled door and a slit window at the second stage of the tower, set back behind. A bipartite window is found on each face of the tower's third stage. A bipartite window exists at ground level in the advanced bay at the centre, with a five-light window on the first floor, and a carved plaque above the gablehead. A four-light window is found in the added bay to the left of the centre. A modern replacement door with a single window flanks a bay recessed to the outer left, alongside a three-light window in a slightly advanced bay to the right of centre, and a four-light window in a bay recessed to the outer right.

The southeast (rear) elevation presents an irregular single-and-two-storey, five-bay design, again with the three-stage tower at the centre. A modern harled addition is present to the first and second stages of the tower. Features include an offset window to the first stage, a window in the left return, a six-light window clasping the angles at the second stage, a modern window offset to the left, a small flanking window at ground level in the gabled bay to the right, and a window at the first floor above. Replaced windows exist at ground level in the bay to the right, and a replaced timber door in the bay to the outer right. A blank gabled bay is situated to the left of the centre, with a replaced door offset to the right in the bay to the outer left.

The northeast and southwest (side) elevations feature blank gabled walls, with a gablehead stack to the southwest.

The building features a variety of glazing patterns, with predominantly two-pane timber sash and case windows, alongside some uPVC replacements. Grey slate covers the roofs, with slate on the shallow piended tower roof. Ashlar coped stacks and cast-iron rainwater goods are also present.

The interior includes a part-glazed vestibule door with figural and foliate etching, anthemion etched lower borders to the drawing room windows, deep and highly decorative cornices with anthemion and bead and reel detail, a foliate embossed (possibly original) ceiling rose in the drawing room, foliate wrought-iron banisters to the turnpike stair within the tower, and a timber handrail.