The National Park Service Southwest Regional Office is a National Historic Landmark with national significance in commemorating the history of the United States of America. Built between 1937 and 1939 to house the National Park Service Region III headquarters, it is a prime example of Spanish-Pueblo Revival style architecture. The building testifies to the work and dedication of the members of Santa Fe Company 833 of the Civilian Conservation Corps, who were part of the 3.25 million Americans who labored and learned during the hard times of the Great Depression. The Civilian Conservation Corps was one of President Roosevelt's most successful New Deal programs, and from 1933 to 1942 it conserved topsoil on millions of acres; built roads, buildings, dams, telephone lines, and parks; and replenished forests, waters, and wildlife.