 After demolishing the existing buildings on the property, the St Mary's school building was extended onto the new property with four temporary demountable classrooms installed on the Presbytery grounds to cater for classrooms displaced during construction.After the completion of the construction in February 2018, the demountable classrooms remained to accommodate the students of Marist College North Shore whilst their campus was renovated in 2020.After 1916 the next major change to Marist Brother's High North Sydney was in response to the 1965 Wyndham Scheme which saw the merging of Marist Brothers Mosman and Marist Brothers High School North Sydney to create a completely new school.