The Treasury Building is the neoclassical headquarters of the United States Department of the Treasury in Washington, D.C.
The building occupies 1500 Pennsylvania Avenue NW, beside the White House. Its construction took place in stages from 1836 to 1869, reflecting the expansion of the federal government. Robert Mills designed the East Wing and central section, while later portions were completed by other architects, including Ammi B. Young, Alexander H. Bowman, Isaiah Rogers and Alfred B. Mullett.
Although it is often treated as one unified structure, the Treasury Building is a multi-wing complex built over several decades. Its long colonnades and classical forms make it a major example of nineteenth-century American neoclassical architecture. The building is also depicted on the reverse of the U.S. ten-dollar bill.
The White House and United States Capitol are nearby landmarks but serve different purposes. The Department of Justice Building is another federal office complex, not the Treasury Department’s headquarters.