The RIBA has opened an exhibition showcasing the results of a pioneering project between 20 London schools and eight architectural practices.
The institute, along with campaign group ArtsInform, linked architects with young people taking GCSE and A level design qualifications.
Teams then produced proposals for regenerating different regions of the capital, including Paddington Basin (with the Richard Rogers Partnership) and Lewisham (with Alsop Architects).
London mayor Ken Livingstone, who will award a prize on 29 June to the most successful project, has agreed to regard all schemes as submissions for his London Plan.
'I think it is important that younger people don't feel that determining the shape of their cities is something somebody else does, ' said RIBA president Marco Goldschmied.