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What Is The Volume Of The Transamerica Pyramid? The four-story base contains 16,000 cubic yards (12,000 m3) of concrete and over 300 miles (480 km) of steel rebar. It has 3,678 windows. The building’s foundation is 9 feet (2.7 m) thick, the result of a 3-day, 24-hour continuous concrete pour. What is the pyramids volume?