Under the leadership of Sister Teresa (1918–25) the School grew rapidly and the adjoining property, Avoca, was acquired in 1918 to provide extra accommodation. It was originally named Mooloomburram when it was built in 1886 by Andrew Petrie. By 1925, Sister Teresa had made St Margaret’s a leading school in Brisbane, with a good record of academic achievement. She introduced the House System, a student representative School Council and the innovative Dalton method of education. Sister Elisabeth (1925–1936) embarked on a building program which saw the construction of many of the buildings still standing today – West Wing with classrooms, dormitories and dining room; the Darnell Art and Music buildings and the swimming pool. These additions were made despite the difficult conditions of the Depression and exemplify the Sisters’ faith in the St Margaret’s of the future. Sister Bernadine (1937–1939) led the School through the difficult and unsettled pre-war years. Sister Mary (1940–1964) guided the School through the years of World War II and the profound changes to School life – closures, reduced enrolments, rationing and shortages.