It was renamed the Ariel Rios Federal Building in 1985, several years after being vacated by the United States Postal Service.
Today's main tenant is the United States Environmental Protection Agency.
It has been listed as an integral part of the Pennsylvania Avenue Historic Site since first designated in 1966.
Originally built as the headquarters for the United States Post Office, the Ariel Rios Building features two grand curving facades intended to face a grand plaza envisioned as part of the Federal Triangle.
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