The kitchen, bathroom, and laundry fitouts are early and it retains early electric monitor boards used by the caretaker to supervise the building. The service core contains service risers and shared facilities, including lifts, a fire stair, dumb waiter for office files, tearooms, and large toilet and shower rooms. The fire stair in the service core retains original finishes, including black and white terrazzo stair treads and risers, black-painted metal balustrades with black plastic handrails, textured stair undersides, and vinyl tile clad walls with contrasting inset floor numerals. The rear podium levels (B3 - G) each comprise large, open floor plans with later lightweight partitions. Window sills are black terrazzo. Early floodlights survive mounted to the exterior of the building. Elements that are not of cultural heritage include: the building's ramps, awning, and doors at the main entrance portico; lightweight partitions and suspended ceilings throughout; kitchen and store room fitouts; and steel shelters of the garden and roof deck. The former Main Roads Department Building stands prominently on a ridge of the folding terrain of Spring Hill. It is highly visible from the surrounding suburbs and has extensive views from the office spaces within. The gardens and open spaces are conspicuous within the immediate streetscape and contribute to the character of the area. The former Department of Main Roads Building was listed on the Queensland Heritage Register on 13 June 2014 having satisfied the following criteria. The place is important in demonstrating the evolution or pattern of Queensland's history. The former Main Roads Department Building (1967) is important in demonstrating the Queensland Government's response to the rise in mass motoring in the second half of the twentieth century. Purpose-built to consolidate and modernise the department's activities associated with expanding and upgrading the state's road network, it was the largest reinforced concrete office building in Queensland at the time of its construction, illustrating the importance of Main Roads operations and contribution to the state's economic advancement. The place is also important in demonstrating the evolution of Queensland architecture as a good, intact example of a substantial, architect-designed building in a Modernist style adapted to suit local conditions. The place is important in demonstrating the principal characteristics of a particular class of cultural places. The place is a good, intact and representative example of the work of architect, Dr Karl Langer, and is important in demonstrating the principal characteristics of his work. Most notably, it: displays a hybrid of subtle Classical allusions and Modernist architectural devices including a forecourt and stylised colonnade front; features characteristic simplified forms, decoration and spatial arrangements and a restrained use of high-quality materials; is sited and its form is manipulated for optimum orientation for natural light and ventilation of the interior, and; is designed to be fit for purpose.