In particular the split-level Terrace, an open lawned area forming a central court which retains a vista toward the river via a small lawn to the south-west of the Main Building. St Gertrude's playing grounds in the northern corner of the school is an established area with important planting including a bougainvillea hedge and a large weeping fig. The gardens surrounding the convent provide a buffer zone between this and the other, more public, buildings on the site. These areas are the chapel garden, the driveway, the former kitchen garden to the north-east and the lawn between the convent and Ann Street which houses many rotary washing lines. There are many large established trees on the site. All Hallows Convent and School was listed on the Queensland Heritage Register on 21 October 1992 having satisfied the following criteria. The place is important in demonstrating the evolution or pattern of Queensland's history. All Hallows' Convent was the first permanent home of the Sisters of Mercy in Queensland and has remained a focal point for their activities until the present day. From All Hallows' the Sisters of Mercy have established convents over the State from where their educational and social programmes are implemented. All Hallows' provides evidence of the development of the order in Queensland. All Hallows' School is the oldest surviving secondary school in Brisbane and is able to demonstrate the pattern of development of education particularly in privately managed schools in Queensland. The school and convent have remained an important feature of the Catholic Church in Queensland throughout the site's 130-year history reflected in the active interest of Archbishops Quinn, Dunne and Duhig in the planning and development of the institution. The place demonstrates rare, uncommon or endangered aspects of Queensland's cultural heritage. Several of the buildings on the site provide evidence of early social and cultural customs which are no longer practiced. St Ann's is one of the few Industrial Schools in Brisbane and thus provides rare evidence of earlier forms of technical education. The gatehouse acted as an almonry for many years and this was always an important element of the Sisters' social programmes. The convent, incorporating the former House of Mercy demonstrates the manner in which the Sisters of Mercy extended charity to whom they considered unfortunate women. The core of the convent at All Hallow's is one of the earliest surviving houses in Brisbane, Adderton built for Dr George Fullerton in the 1850s. Features which remain extant from this building include a rare Queensland example of a geometric spiral stair, early glazing and timber joinery. The place has potential to yield information that will contribute to an understanding of Queensland's history.