Sir Robert Hogg Matthew first proposed the University of Edinburgh/Nicolson Street Comprehensive Development Area (CDA) in 1960. This would bring together the University of Edinburgh, the Corporation of the City of Edinburgh and private enterprise to create one coherent redevelopment plan. Percy Johnson-Marshall was appointed Planning Consultant to the University of Edinburgh in 1962 following a viability survey and interim report the previous year. His scheme proposed a tripartite megastructure, with upper-level pedestrian circulation and traffic segregation. The Nicolson Street commercial area would be flanked by University structures to the west and an area, designated for redevelopment by the Corporation for housing purposes, to the east. The University development proceeded on the assumption that the CDA would achieve statutory status, with Johnson-Marshall supervising its design and negotiating with the City Planning Department of the Corporation of the City of Edinburgh and, for a time, a private developer, Ravenseft Properties Limited. The CDA was superseded by the South Side Local Plan ( 1975) , prepared for the Corporation by Percy Johnson-Marshall & Associates. Johnson-Marshall remained planning consultant to the University until 1985, with Bristo Square, designed by Percy Johnson-Marshall & Associates, and completed in 1982, the final element to the University's unfinished scheme.