Built in 1892 by local businessman James K. Sweeny, the Victorian mansion at Third and Terry Streets in Longmont was acquired by Thomas and Alice Callahan, two of the city’s leading residents, in 1896. The Callahans conducted extensive renovations and…

The East and West Side Historic Districts in Longmont are located east and west of Main Street and south of Longs Peak Avenue. They contain many of the city’s earliest homes. The East Side Historic District includes 67 historic houses and was added to…