Both buildings feature facades with a tripartite arrangement and center frontispieces that project slightly forward, a broad rock-faced beltcourse that runs above the second floor windows, a narrow metal cornice, and a brick parapet with finials.

The Opera House's parapet has a triangular pediment with "Opera House" on a rectangular base, and the Hetherington Block has a similar feature in a simplified form.

[2] The buildings were listed together on the National Register of Historic Places in 1979.

[1] In 2014 they were included as a contributing property in the Greenfield Public Square Historic District.

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