Obayashi has been completing large and complex civil and building projects in the U.S. since 1968. They often work through integrated joint ventures. Favored contracting methods include conventional, design-build, CM/GC, CM@risk, and are willing and able to bring value to a P3 consortium. Civil specializes in public infrastructure projects including tunnels, shafts, and other underground structures, water and waste water treatment plants, and concrete bridges including cable-stay and extradosed. (Search "Colorado River Bridge".) Buildings include public and private, low/medium/high rise, offices, hospitals, commercial, industrial, retail, manufacturing, with a specialty in highly unique buildings such as clean rooms, hospitals. (Search "California Academy of Science Building".)