on 21 April 1963 for a cost of £44,501. This was another structure with a reinforced concrete frame, styled and dressed to match the building it joined. It extended the "South Wing" eastward, taking the southern range to its present extent, further closing the quadrangle. It stopped short of the line of the east range which at that time had not reached its full extent. It was named the "Ross Wing". The quadrangle was still not completed and with the centennial of the Theological Hall approaching the College Council decided in August 1974 to mark it by extending the library. Fund raising was difficult but work began in August 1983. The extension was opened on 30 May 1984 for a cost of $463,000. This is another structurally modern building dressed to complement the context. By this time Arthur Salmond had retired but his son John (1940–2008) was in practice. The addition extends the east range southwards, taking it to the line of the south range but leaving an open space between. With this the quadrangle was all but complete. Post-millennial contributions In 2008, the Hewitson Building was modified to house offices and teaching spaces for the newly formed Knox Centre for Ministry and Leadership (previously the School of Ministry), and to provide a purpose-built facility for the Presbyterian Archives. In the summer of 2012–13, the main residential building was earthquake-strengthened to comply with the latest building code. At the same time, 40 rooms were added to the college. Some of these were the result of the reconfiguration of rooms and offices at the northern end of the ground floor of the main building; others were the result or rebuilding the area of the college known as The Close. Opportunity was also taken to refurbish the main building from top to bottom, and to open up the Great Hall to the Junior Common Room to facilitate dining for the increased numbers at the college on formal occasions. In the summer of 2019–2020, the area of the college known as Somerville Close, comprising Mackay, Marshall, Glendining and Wilson Houses, underwent an extensive refurbishment. Changes in governance and leadership In February 2012, a Commission was appointed by the General Assembly of the Presbyterian Church of Aotearoa New Zealand to assume responsibility for the governance and management of Knox and Salmond Colleges, instead of the Council of Knox College and Salmond College. The General