Big Four Building, Renaissance Revival building in Old Sacramento, United States.

The Big Four Building stands at 54 K Street in Old Sacramento, a block from the Sacramento River. It joins the Stanford, Huntington & Hopkins and Miller buildings, put up in 1851 and 1852 and merged into one structure by 1878. The facade is Renaissance Revival, and the ground floor once held Huntington, Hopkins & Co.'s hardware and iron store.

The Big Four House began as three adjoining buildings put up in 1851 and 1852 along the Sacramento River waterfront: the Stanford Building, the Huntington & Hopkins Building and the Miller Building. Ownership was consolidated by 1878 and the three were enlarged into a single building. From 1862 to 1873 the second floor held the first offices of the Central Pacific Railroad, organized here by Huntington, Hopkins, Stanford and Crocker, who also founded the Southern Pacific Railroad in these rooms.

The building marks the period when Sacramento grew from a Gold Rush camp into a business center through railroad expansion. Visitors can still see how the connected spaces reflect the way these merchants and executives worked together during that era.

The building sits in the heart of Old Sacramento's historic district and is easily reached on foot. Multiple entrances provide access, and nearby attractions make it convenient to combine a visit with other local landmarks.

The second floor of the merged building served as the first offices of the Central Pacific Railroad from 1862 to 1873, and the Southern Pacific Railroad was also founded in these rooms. Huntington, Hopkins & Co. sold hardware, iron, steel and coal at 54 K Street.