 The plant was originally built in 1929 as Sikorsky Aero Engineering Corporations's manufacturing facility.It occupied a tract and included 49 industrial buildings and an earthen causeway that was built into the Housatonic River mudflats to provide for access by seaplanes.The Sikorsky S-39, Sikorsky S-40 "Flying Forest", Sikorsky S-41, Sikorsky S-42 "Clipper" and Sikorsky S-43 "Baby Clipper" were built in this plant, which had a seaplane ramp for launching the aircraft into the Housatonic River.