The Colonial Apartments is located on High Street in Bangor, a curved one-block street at the crest of a hill two blocks up from the city?s Main Street. All of the buildings on this street were originally built as high-style residences, between the early nineteenth and early twentieth centuries, with the apartment building as the last addition to the neighborhood. Erected in 1919, the six-unit, three story, brick apartment building was designed in the Colonial Revival style by local architect Victor Hodgins (1870-1954). The building was stylishly designed both to fit into the neighborhood and to attract stable, middle-income occupants. Part of its significance is that the construction of this apartment building reflects changes in Bangor?s economy, wherein the city had transformed from an internationally significant lumber port to a more diversified regional manufacturing, commercial, and service-oriented economy. These economic forces resulted in a change to the city?s social structure, with the expansion of the middle-class and, to a lesser degree, the working class. While the dominant form of housing for both the working and the middle classes in the city was single-family residences, a small number of apartment buildings were constructed in the city as alternative to single-family homes. The six-unit building is unique in Bangor because it is the sole remaining early twentieth-century apartment house in the city that was designed for the middle class and that retains its integrity. The Colonial Apartments was listed in the National Register of Historic Places at the local level of significance for the manner in which it helps to illustrate the social history of Bangor, and also as a fine example of an architecturally stylish multi-family apartment house.