The building, which occupies an entire city block, was erected in two sections, the first in 1912, the second in 1928. The first section was designed by the government architect of the day, George McRae, whose work includes the Queen Victoria Building and Central Railway Station. The Edwardian baroque sandstone building is listed on the Register of the National Estate and classified by the National Trust. Following restoration, the building represents a tasteful blend of history and modernity. Areas of major heritage significance such as entry porches, foyers and stair lobbies have been preserved and enhanced.
Australian marbles feature in wall panelling, columns, pilasters and stair surfaces.
The ministerial boardroom has finely crafted woodwork, while the art gallery and adjoining meeting room feature copper clad sky lights. The building is also technologically advanced with fully computerised systems controlling lighting, security, fire, air-conditioning and lifts. Refurbishment work has included the construction of modern open plan office areas sufficient to accommodate 700 staff.