The Twentieth Century Society (C20) has put forward an experimental school in Islington, north London, for spot-listing.
The run-down Hungerford School building - built by the Inner London Education Authority department of architects between 1969 and 1970 - is under threat of being demolished and replaced with an apartment complex and a new school.
C20 caseworker Cordula Zeidler said the building, with its distinctive butterfly roofing, has been allowed to fall into a state of disrepair and requires work to bring it up to an acceptable standard.
However, this would be worthwhile, she insisted, because it represents an excellent example of the development of post-war British design.
Zeidler told the AJ that it would be scandalous if the London Borough of Islington was allowed to demolish one of its 'most remarkable 1960s buildings'.
'The school is highly sophisticated, ' she said. 'Its innovative plan of interconnecting wedges precedes Deconstructivist designs and the treatment of materials, including exposed concrete blocks, is reminiscent of the Smithsons' work.
'The dramatic roofscape and the carefully designed landscaping surrounding the building add great interest to the neighbourhood.
All this would be swept away to be replaced by a denser scheme.
'The school has been left to deteriorate and very little maintenance has been carried out. We urge Islington council to retain and repair this building, ' Zeidler added.