The Monadnock Building in Chicago was built for the Boston developers Peter and Shepherd Brooks, with Owen F. Aldis managing the project. Burnham & Root designed the north half, completed in 1891 per the text, and Holabird & Roche designed the south half, begun in 1892 and finished in 1893. The style is Chicago School.
Purple-brown brick walls rise 215 feet (66 m), with north walls 6 feet thick at the base, over a floating foundation. The facade is unornamented, with oriel windows. The interior used a cast and wrought iron frame, Carrara marble wainscoting and cast aluminum stairs, while the south addition has steel framing. The lead says 16 stories, but the text says 17 including an attic.
William S. Donnell bought it in 1979 and restored it over 13 years. Sources from 2008 to 2010 describe it as 98.9% leased to mostly professional firms, so its current status is unverified.

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