The former Administration Building has a frontage directly onto the public street of Schoolhill and was completed in 1885. It is a significantly larger building than the street frontage suggests. On completion, it housed Gray's School of Art and was designed by the prominent Aberdeen architect Alexander Marshall Mackenzie, who designed many of the city's grand granite buildings in the 19th century. The building is constructed of grey and pink Corrennie granite ashlar with Corinthian columns and was designed to match the Aberdeen Art Gallery adjacent to it, and like these buildings, it is Category A listed by Historic Scotland. As the School of Art grew in size, the building was extended in 1896 and again between 1928 and 1931. However, it eventually became too small and when Gray's School of Art moved to a new modernist building at Garthdee in the 1960s (see above), the building was converted for administrative use. From then until 2013 it housed the Principal's office, which moved to Garthdee House at the Garthdee campus, followed by the administrative staff in 2017.