In 1916, Archbishop James Duhig created the parish of Toowong by separating Toowong and Indooroopilly from Rosalie, and placed it under the charge of a group of newly arrived Jesuit Fathers.
During the Second World War, a new classroom block was erected behind St Ignatius Church and fronting Grove Street, at which time the Sisters of Mercy agreed that students could use part of the convent grounds (the terrace on the northern side of the house) as a playground.