Margaret Hall, built in commemoration of the 100-year anniversary of the foundation of Sagami Women’s University, is a structure with clear glass exteriors. This feature allows for the penetration of bright and soft natural light into the building, and the effective utilization of this daylight for lighting the stairways, elevator lobbies, and the atrium cafeteria.

SUNBALANCE Glass

Margaret Hall used a type of glass that has very high thermal insulation properties, called "Sunbalance" manufactured by Asahi Glass. This glass has an "air space" between two sheets of glass, and has a special clear metal coating on the inside of the outer sheet of glass. This "air space" controls the movement of emissive heat, and brings about highly effective thermal insulation, and the "special metallic coating" allows the penetration of visible light, while reflecting heat (infrared radiation) and ultraviolet radiation.

Thus, Sunbalance conserves energy spent on lighting by allowing natural light to illuminate the interiors, as also energy expended on heating during winter.