4, 5 and 6 Melville Crescent, 43 Melville Street and 19 Walker Street

4, 5 and 6 Melville Crescent, 43 Melville Street, and 19 Walker Street is a group of classical townhouses designed by John Lessels between 1855 and 1856, which connects to earlier end terrace blocks by Robert Brown from 1814. The buildings are three stories tall with a basement and feature a unified façade. They have main-door and common stair flats behind, with oversailing platts. The basement area includes some vaulted cellars and retaining walls. The exterior is made of sandstone ashlar, channelled at the ground floor, with a banded base course, banded cill and string courses at the first floor, and a banded cill course at the second floor. The stepped parapets have balustrades in between. The main doorway has a round arched surround with a fanlight and narrow sidelights, and there are cast-iron balconies on foliate brackets at the first floor. Decorative cast-iron arches with lamp holders are present on Melville Street.

The south elevation on Melville Crescent is symmetrical with nine bays, featuring advanced and pilastered central three bays and single end bays. The ground floor has recessed round arched surrounds to the windows at the center. The first-floor windows are architraved, bracketed, and corniced.

The southeast elevation on Melville Street and the west elevation on Walker Street are symmetrical with five bays, having advanced flanking bays and a recessed center. The basement is vermiculated sandstone ashlar. There is radial glazing to the fanlight at Walker Street, with recessed round arched surrounds to the advanced bays at the ground floor and architraved, bracketed, and corniced surrounds at the first floor, with a pedimented center.

The windows are predominantly 12-pane timber sash and case, with some later plate glass in timber sash and case. The roof is a double pitch M-section covered with grey slates, featuring corniced ashlar gable end and ridge stacks with modern clay cans. Cast-iron railings are on the ashlar coping stone edging the basement recess.

Inside, the interior is characterized by a highly decorative classical scheme with detailed cornicing, and it has been converted for later office and residential use in 2008.

Large ornate cast-iron arches with lamp holders are located above the entrance platt to Melville Street, some featuring glass bell-jar shades. Coiled cast-iron serpent lamp snuffers are positioned on each side of the archway.