Union Block (Brigham City, Utah)
The Union Block, a building at 57 S. Main St. in Brigham City, Utah, was built in 1892.  It was listed on the National Register of Historic Places in 1991.

It is a two-part commercial block building.  It has also been known as the C.W. Knudson Building.

It was expanded to the rear in 1929 by  to accommodate a J.C. Penney store as a tenant, in work done by builder Royes J. Petersen.

References

National Register of Historic Places in Box Elder County, Utah
Buildings and structures completed in 1892