1875. Effectively, a new era of state education evolved with new architectural responses needed. The Department of Education (as it had been renamed in 1957) continued to give the responsibility of building design to the architects of the Department of Public Works. Due to new materials, technologies, educational philosophies, government policies, architectural styles and functional requirements, the evolution of standard designs became more fragmented. Rather than "improving" on the previous designs, architects began to design on a relatively clean slate, inspired by new precedents. Fundamentally, timber construction was no longer favoured and buildings were no longer predominantly high-set. In 1975 a new library building was constructed at Toowoomba Girls' and Infants' State School. This was a "System IB74", a standard building designed by Codd Hopgood Industrial Architects, and was a concrete slab-on-ground, prefabricated steel structure. The open-air annexe was moved to make room for the library construction. It was relocated at the southern end of the site, near the western boundary. It was oriented so that the verandah faced west and was low-set on concrete stumps. The teacher's room was removed from the verandah at this time and possibly became a pavilion for the nearby tennis courts. The enclosed verandah was altered to accommodate a toilet at the northern end which was later removed. A 1975 site plan shows that between 1960 and 1975 the school grounds had expanded to include additional allotments on the western side facing Ruthven Street. On 1 March 1983 the nearby Toowoomba South Boys' State School was closed and the boys were amalgamated into the girls' and infants' school, which was renamed Toowoomba South State School. Minor alterations to the toilets in the understorey of the 1941 building were undertaken during this transition. A large concrete and steel covered games area was constructed to the south of the 1941 brick building. In 1990 the school celebrated its 125th anniversary of establishment and an anniversary souvenir booklet was published for the event. In 1999 further alterations were made to the 1941 brick building. The westernmost classroom on the second floor was enlarged by partially removing the corridor wall and this space was incorporated into the classroom. At the same time, alterations were made to the Wadley Wing, including removing sections of the verandah wall, removing partitions, and inserting new partitions to create a withdrawal room and an art space. Later the SEDUce (Special Education Development Unit)