National Register of Historic Places in Conejos County
As the headquarters for La Sociedad Proteccion Mutua de Trabajadores Unidos since 1925, the building represents an important aspect of Hispano history. Originally created to combat racism against Hispanos in the San Luis Valley, this fraternal organization later expanded to provide mutual aid, thereby playing an important role in the overall social history of Colorado.
Construction of this building popularized the use of steel trusses, introduced changes in massing, and promoted hybridized Southwest vernacular designs subsequently utilized in other Hispano enclaves.
Quoted from the History Colorado website.