opening of the college. 1920s: Construction of the porte cochere in front of the main entrance to the building on the southern side, including alterations to the original balustrade of the entrance stair (this structure was demolished in the 1980s). 1923: Relocation of the cottage The Rocks to the north east corner of the property. 1926: A grotto was built in the front garden of the convent to commemorate the Silver Jubilee of Mount St Mary's College. 1920s - 1930s: Infilling of the balconies at the ground and first floor level along the northern side of the 1910 building. 1946: The original building complex was extended to include a four-storey extension, constructed on a north–south axis, at right angles to the original school building, and projecting to form an informal north east facing courtyard. 1960s: A science wing was subsequently erected adjoining the east wing of the original 1910 building, and continuing in the same east–west plane. Alterations to provide internal access at the ground and first floor level. 1980s: Alterations for Renaissance Centre including: Construction of a Kiosk and walkway from Civic Place; Alterations to the partitions at basement floor 1910 building; Alterations to the internal partitions, southern end of the 1946 extension. New arched openings to the northern and southern side walls of the ground floor classroom, first floor dormitory and adjacent to the chapel. Construction of the glazed restaurant addition at basement level on the northern side of the 1910 building. Heritage listing As at 25 March 2003, Statement of Significance The place known as Mount St Mary's College and Convent and subsequently the Renaissance Centre is of State significance because of its connection over an extended period of time with the Congregation of the Sisters of Charity in Australia, the oldest such order in Australia, and with its unbroken association with education from 1909 - 1991. The physical location, expansive modified landscape setting, and imposing complex of ecclesiastical buildings dominated by a tower, lends Mount St Mary's great aesthetic significance in the cultural landscapes of the Blue Mountains. It remains a visually significant landmark at the eastern gateway to Katoomba and has great social significance for the former religious community, students, and wider Blue Mountains communities. The complex of buildings elegantly demonstrate the Federation Free Classical style ecclesiastical architectural language. In addition, the extensive hard and soft landscape design elements define a number of official, religious,