The Boeing 747, 767 and 777 airplanes are manufactured in Everett, Wash., which is located 30 miles (48 kilometers) north of Seattle. The main assembly building is listed in the Guinness Book of World Records as the largest building in the world by volume. It has grown over the years to enclose 472 million cubic feet of space (13.3 million cubic meters). Its footprint covers 98.3 acres (39.9 hectares). The original factory was completed in 1968. It was expanded by more than 45 percent in 1980 to house the 767 assembly line, and another 50-percent enlargement was added in 1993 for 777 assembly. The Boeing Everett plant is so large that it requires its own fire department, security force, fully equipped medical clinic, electrical substations and water-treatment plant.