The Rath Packing Company Administration Building, also known as Adams Store Inc., is a historic Late Gothic Revival building in Waterloo, Iowa. It is a surviving remnant of what was the largest meat-packing plant in the United States in 1941. The plant started in 1891 with hogs, and was "massive". The company was the 5th biggest at the end of World War II, in 1945. In 1966 it was the ninth largest, and it was also the 249th biggest industrial company of any kind in the United States. It closed in 1985. It was listed on the National Register of Historic Places in 2008.