The Old Post Office and Courthouse is a historic courthouse and former post office in Auburn in Cayuga County, New York. It is a monumental Richardsonian Romanesque limestone-and-brick civic building built in 1888–1890 and expanded in 1913–1914 and again in 1937. It serves as a courthouse of the United States District Court for the Northern District of New York.[2] The massive, asymmetrical, 2 1⁄2-story main block (1888) is one of a number of post offices in New York state designed by the Office of the Supervising Architect of the Treasury Department, Mifflin E. Bell. It includes a 3-story tower at the southwest corner, a 2 1⁄2-story stair tower, and two massive Richardsonian Romanesque–style entrances. The building was surplussed by the federal government. Built: 1888–1890 Architect: U.S. Treasury; Et al. Architectural style: Queen Anne, Romanesque, Richardsonian Romanesque Governing body: Local NRHP Reference#: 91000722