The Riverdale Heritage Conservation District was designated under the Ontario Heritage Act in 2008 to protect portions of First Avenue, Tiverton Avenue, and West Avenue. The designation applies to 224 properties within this district, as it illustrates a relatively complete streetscape from the early 20th century with nearly all original buildings still in place.
The district's streets were among the earliest to be developed on the east side of the Don River. First Avenue (formerly Lefroy Avenue) was laid out as a subdivision of a farm lot in 1886, while both Tiverton Avenue (formerly East Avenue) and West Avenue were subdivided in 1888. Houses here were built between the late 1880s and the beginning of the First World War. They are simple variations of the "Bay and Gable", Second Empire, and Edwardian Classicism styles, and reflect the modest means of the people who first owned them.