 By the 1950s Boeing Plant 1 consisted of more than 20 buildings.The facility was made obsolete by the larger airplanes produced in the 1930s, and was used primarily as a forging plant and testing facility, as well as a producer of component parts used in the production of airplanes in other Boeing facilities.The Boeing Plant 1 site was sold to the Port of Seattle in 1970, and is currently located on the southern portion of the Port of Seattle Terminal 115 site.