Spearheaded by Paris mayor Anne Hidalgo, the Reinventer Paris competition called for architects and developers to team up and develop plans for numerous key sites around the city, from old railway stations to historic mansions.
According to Hidalgo, the aim is to "prefigure what the Paris of tomorrow might be".
The 23 winning projects include buildings spanning roads, apartment blocks covered in plants, an electricity substation converted into a cinema, and a warehouse transformed into a new community hub.
British architect David Chipperfield and Danish-Icelandic artist Olafur Eliasson both feature on the team selected to overhaul the Immeuble Morland – a 50-metre high former-state-owned complex on the banks of the Seine.
Described by the competition organisers as one of the flagship projects, the 40,000-square-metre site is earmarked for a mix of uses including 5,000 square metres of social housing and a new crèche.
Japanese architect Sou Fujimoto partnered with regular collaborator Paris-based Manal Rachdi Oxo Architectes on a proposal for a building spanning Boulevard Périphérique, next to the Palais des Congrès de Paris.
Briefed to create "an innovative and cutting-edge project", the team's winning scheme proposes a curving structure that tapers outwards at the top to create extra floor area. The programme will include 30 per cent social housing provision.
Jacques Ferrier Architectures and Chartier Dalix Architectes are also working on a project spanning Boulevard Périphérique – a major ring road that divides the wealthy city from its working-class suburbs.
"A city like Paris must be able to reinvent itself at every moment in order to meet the many challenges facing it," said Hidalgo in a statement on the competition website.
"Particularly in terms of housing and everything relating to density, desegregation, energy and resilience," she added. "It is important in today's world to find new collective ways of working that will give shape to the future metropolis."
French architect Manuelle Gautrand was selected for her proposal to create a plant-covered housing block beside a conservatoire in the 13th arrondissement.
Other winning proposals include a project by Nicolas Laisné Associés, which aims to re-plan a community landscape to make room for new development.
Living wall expert Patrick Blanc is also involved, as part of team proposing uses for an empty 2,000-square-metre site on the southern edge of the city.
All 23 sites comprise land and property either owned by the city or by social housing landlords or developers who are competitions partners. Now that the winners have been announced, the next phase will be to develop a plan to realise each project.
Each proposal is expected to integrate forward-thinking approaches to energy production, consumption and recovery, as well as to include "ecological materials" and "innovative planting".
"Innovation also means investing in new spaces: basements, roofs, wasteland, the Périphérque and all the abandoned spaces that sometimes represent the future of our metropolis," commented Jean-Louis Missika, the deputy mayor in charge of town planning and architecture.
Paris has been the site for a number of innovative projects and proposals in the last few years. The most high-profile new additions to the city include Frank Gehry's Fondation Louis Vuitton, Jean Nouvel's Philharmonie de Paris and the reconstruction of Les Halles market.
Other new designs include a multicoloured basketball court, Herzog & de Meuron's 180-metre-high Tour Triangle and a conceptual capsule hotel on stilts along the Seine.
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