Department of Agriculture South Building

The South Building was built beginning in 1930, to house the expanded offices of the United States Department of Agriculture (USDA).

One of the largest and most significant examples of Federal government expansion during the 1930s, built as an office and laboratory annex to the Department of Agriculture; notable attempt to accommodate efficiency and flexibility in large-scale government construction, using modular scheme of multiple wings separated by light courts, originally termed the "Extensible Building;" once considered the world's largest office building; Classical Revival design intended to remain subordinate to the Main Agriculture building; variety of facade materials including variegated brick, terra cotta, iron, and limestone; extensive interior and exterior ornamentation with agricultural motifs; under design by 1927, built in phases between 1930‑36, including pedestrian bridges across Independence Avenue; designed by Louis A. Simon of the Office of the Supervising Architect of the Treasury.

DC designation April 26, 2007
National Register listing July 5, 2007

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1351 C Street, SW