On San Francisco's rugged Pacific coastline, a new 4,000 sf preschool building provides modern facilities for an established Montessori program. A pre-engineered steel frame and roof system creates a long rectangular shed into which a series of framed prisms, housing the 'hard' functions of the program, are inserted. Oriented along the east-west axis to maximize solar gain and light through the glazed southern fa�cade, the shed's roof slopes to collect rainwater for irrigation. The two classrooms open out through the porous south wall onto a generous landscaped play area.

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