{"id":737,"featured":0,"modified":"2026-04-17 19:40:09","latitude":46.5889209570733555665356107056140899658203125,"longitude":-112.0389873884827238725847564637660980224609375,"title":"Power Block &amp; Power Block West","subtitle":"Helena Historic District","fullsize":"https://mail.historicmt.org/files/fullsize/fd6c1e05b8e4a48998f3feb4e9314d10.jpg","address":"Corner of 6th Avenue and North Last Chance Gulch, Helena, Montana","all_locations":[],"zoom":17,"creator":["Montana National Register Sign Program"],"description":"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.","sponsor":null,"accessinfo":"Private","lede":"","website":"","related_resources":["<a href=\"https://npgallery.nps.gov/NRHP/GetAsset/3fca4448-c79e-4066-a62a-fe552a5d23e2\" target=\"_blank\" rel=\"noreferrer noopener\">Read about the Helena Historic District</a>","<a href=\"https://npgallery.nps.gov/NRHP/GetAsset/d8c79c92-0567-4c6d-8d35-cf378fb0b7ce/\" target=\"_blank\" rel=\"noreferrer noopener\">See photos of the Helena Historic District</a>"],"factoids":[],"files":{"https://mail.historicmt.org/files/fullsize/fd6c1e05b8e4a48998f3feb4e9314d10.jpg":{"id":1299,"mime-type":"image/jpeg","title":"Power Block","description":"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, &quot;Village Brownstone.&quot; Front/side view of building, facing southwest. | <a href=\"https://www.mtmemory.org/nodes/view/74141\" target=\"_blank\" rel=\"noreferrer noopener\">Montana History Portal</a> | Between 1970 and 1985. | Unidentified photographer","thumbnail":"https://mail.historicmt.org/files/square_thumbnails/fd6c1e05b8e4a48998f3feb4e9314d10.jpg"},"https://mail.historicmt.org/files/fullsize/83a3f3da44c4e830278fd8f786732b06.jpg":{"id":1317,"mime-type":"image/jpeg","title":"Power Block","description":"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. &quot;American National Bank&quot; 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. | <a href=\"https://www.mtmemory.org/nodes/view/73528\" target=\"_blank\" rel=\"noreferrer noopener\">Montana History Portal</a> | Between 1890 and 1900 | Unidentified photographer","thumbnail":"https://mail.historicmt.org/files/square_thumbnails/83a3f3da44c4e830278fd8f786732b06.jpg"}}}