Filed Under Helena

Power Block & Power Block West

Helena Historic District

Influential merchant and investor T. C. Power built his fortunes by controlling much of territorial Montana’s commerce and Indian trade. This outstanding granite business block housed Power’s American National Bank from 1892 through the 1920s. Willetts and Ashley of Chicago drew the plans for the 1889 building, which reflects both the Romanesque Revival style and the American transition to the then-emerging Chicago School of architecture. The rounded northeast corner features openings that correspond in number to the floor level. The Power Block West, built to match the original design, was added in 1914.


Power Block
Power Block Power Block. View of a large commercial building with a stone exterior known as the Power Block at Main Street and 6th Avenue in Helena, Montana. Prominent sign on lower corner of building read, "Village Brownstone." Front/side view of building, facing southwest. Source: Montana History Portal Creator: Unidentified photographer Date: Between 1970 and 1985.
Power Block
Power Block Power Block, at the corner of 6th Avenue and Main Street. A horse and carriage are in the street and a man with a bicycle is on the sidewalk. "American National Bank" is painted on a window of the Power Block. Front/side view of the building, facing west on 6th Avenue near present-day Constitution Park. Source: Montana History Portal Creator: Unidentified photographer Date: Between 1890 and 1900


Corner of 6th Avenue and North Last Chance Gulch, Helena, Montana | Private


The Montana National Register Sign Program, “Power Block & Power Block West,” Historic Montana, accessed May 21, 2024,