The American Cooperative School of Tunis provides a K-12 educational program as diverse as its community. With expat students and educators from around the world, ACST thrives as an International Baccalaureate with a strong emphasis on blending culture with core curriculum. An extensive variety of courses and a project-based approach required a masterplan that was adaptable yet abundant in its variety of learning environments. Numerous community engagement meetings identified the parameters for the full replacement of the middle and high school level facilities, all while the campus remains operational. Additionally, the program was expanded to include study rooms, common work areas, STEAM labs, and a new aquatic center all while maximizing outdoor space. Extensive phasing studies were generated to accommodate new construction while mitigating disruption and maintaining site security. The proposed structure comprises two academic wings with a learning commons connector that provides outdoor learning opportunities at the ground level as well as second and third stories. The external design of the secondary school draws on architectural cues of the existing elementary school building while establishing a distinctive identity.