In March 1936 The Boeing Airplane Co. bought 28 acres on Marginal Way in Seattle, between Boeing Field and the Duwamish Waterway, and built a $250,000 facility at the site. It was known as Plant II and was important to the war effort in the 1940s, with 30,000 people building the B-17 and B-29 bombers. It was known home to Rosie the Riveter—women working then nontraditional factory jobs.