Abstract
This building is a data center building, characterized by the quick conversion from office to server room with under floor air conditioning system and ceiling less system. The facade has the high performance heat insulation and solar shading by the pair glass and the vertical type louver turned on hinge. Furthermore perimeterless system is actualized by the built-in fans under the floor which control solar radiation load in summer and cold draft in winter. The result of winter measurement cleared effectiveness of these systems.