San Francisco boasts a remarkably mild climate with relatively little seasonal temperature variation. Prevailing breezes on the site are from the west, with the hottest days of the year associated with the Santa Ana winds from the east. The building’s perforated, operable east and west facades exploit these east/west breezes to provide passive cross-ventilation in both conditions. The perforated skin of the building has worked as designed, providing passive cross ventilation from west to east in the direction of the prevailing winds. The occupants open the windows on both ends of the building each day, allowing fresh air continuously though the space. The occupants are comfortable and have not had to adapt the building in any way.