Built in 1886, it is one of the city's most architecturally sophisticated 19th-century buildings, designed by the Portland firm of Fassett & Tompson.

Its main section is a large 2+1⁄2-story masonry structure, built out of red brick with brownstone trim, and covered with a hip roof.

It has a shallow cornice with corbelled brickwork, and a slightly projecting two-bay section which rises to a gable housing three narrow round-arch windows.

Part of the rear addition was built in 1912, its cost donated by the daughter of mill owner S. D. Warren.

A second extension to the building's left, also designed by Frederick A. Tompson, was added in 1913 but razed in 1976 to make way for the post office.