KDI, the national premier economic think tank is a policy research institute which establishes government’s economic policies. The new KDI building in Sejong city composes of three programs-research center, graduate school and dormitory units. Research center and graduate school is programmed as two core concept called ‘LOOK&THINK +SHARE ’. LOOK&THINK section, people predict and consider about policies, and the other party, +SHARE section provides interactive supporting/public facilities. The mass of +SHARE sits on a natural landscape providing open exterior spaces and diverse scenic views by floated over the meeting point between a mountain and a flatland. Meanwhile, LOOK&THINK mass arranged by the rule of urban fabric, is planned as a separated compact mass. The LOOK&THINK mass simply plugged-in to +SHARE mass to maximize the function of KDI building in both private and public.