Toolbox is a professional space obtained by the adaptive reuse of an industrial building in the city of Torino. Designed as a hybrid between a co working and a corporate building, Toolbox responds to a professional reality increasingly represented by freelance workers. From the perspective of the design process, the goal was to mediate between the plurality of users' needs and the coherence of the design. The variety of solutions obtained demonstrates the use of a unique design rule inspired by genetic algorithms. By combining the attributes and building blocks of a population, it is possible to achieve a bigger variety of solutions responding to different fitness requirements.