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Architects: Longfellow, Alden & Harlow Founded in 1873, the Duquesne Club is renowned as the oldest and most prestigious of Pittsburgh's clubs. The clubhouse on Sixth Avenue was designed by one of the successor firms to H. H. Richardson, the architect of the Allegheny County Courthouse, in the Romanesque style. The original brownstone club building was symmetrical, with its arched entrance located between two shallow projecting bays. The building was extended to the east in 1902 in the same style by the firm of Alden & Harlow. In 1930-31, the Duquesne Club built a residential tower to the rear of the lot, in a less-emphatic Romanesque style designed by the firm of Janssen & Cocken.
