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The San Francisco Museum of Modern Art, which will open its doors in early 1995, has a unique three-level, stepped-back brick masonry on its facade. The building has precast walls with red, «-inch clay brick cast into the concrete. Seismic concerns make thin brick ideal for San Francisco. Regular brick weighs about 25 pounds per square foot compared to 4 pounds per square foot for thin brick. The light weight, plus the fact thin brick can't separate from the rest of the precast panel, makes injury and damage during an earthquake less likely. In addition to its unique facade, the steel-frame museum also features a truncated cylinder with a 45-degree angle on top of the building's second tier. The cylinder is finished in alternating bands of black and white stone and topped with a radial pattern of the same contrasting stone.