The International School of Brussels (ISB) was established in 1951 as a not-for-profit organization and is the oldest international school in Belgium. With more than 1500 students from 70 countries, the school offers an international education for students from age 3 to 18 with equally robust academic, athletics, and arts programs. The campus is a 16-hectare (40-acre) wooded site, half of which is protected green space. Flansburgh conducted three design workshops at ISB to develop a comprehensive master plan in collaboration with the ISB community.

The vision of the campus centers around bringing the performing and visual arts to the heart of the campus as a shared space for the entire ISB community. The key recommendations of the master plan include traffic and parking improvements; a new Art and Music wing in place of an aging gymnasium; a new Athletic Center strategically located between two sports fields; a new Elementary school geared toward 21st Century learning goals; and renovations of historic buildings on campus. Reinstating original views and sight lines, connecting protected green zones with tree corridors, and moving parking to the periphery were other important guidelines. The plan was phased in six stages and included projected cost estimates.