The project proposes a layer of lightweight, community-centric infrastructure throughout London by establishing a new type of a Community Land Trust and challenging preconceived methods of building. The Civic Logic Alliance aims to bring communities together by enabling them to build on the vast amount of leftover, seemingly unbuildable spaces throughout the city. An open-source, participatory platform that challenges existing construction systems and acts as an operating system for architecture. The members focus on existing or attained skills in order to build structures that reflect their needs, characters, time and funds. The project opens up the possibility of building as an action of civilian collaboration. The finished building is not the goal. Because the project is subject to a Civic Logic, rather than a Financial one, the CLA structures are mere vehicles for the civic activities they promote. Therefore, they can sometimes exist entirely digitally. The Civic Logic Alliance injects connective infrastructure into otherwise finished architecture. Ultimately, it aims to deliver highly frictional and resilient instruments of citizenship while promoting a new sense of logic of building in London.