The property was initially used as a training college for brothers; the school came later. The training college for brothers evolved into a training college for Catholic lay teachers, which was then merged into the Australian Catholic University in the 1980s, which then became the Castle Hill campus of the ACU. Finally, in the 1990s, the ACU decided to consolidate their campuses in Sydney, and abandoned their Castle Hill facility, which then reverted to the De La Salle brothers. Since then, the original training college has been extensively renovated, named the De La Salle Building and forms part of the school.