Abstract: Blueprints and drawings of buildings and properties owned by the family of Cyrus Hall McCormick, including Nettie Fowler McCormick, Cyrus McCormick Jr., Harold McCormick, Mary Virginia McCormick, and Stanley McCormick. Properties include Walden, Walnut Grove, Caravels, Clayton Lodge, Harbor Point, Oaklands, House in the Woods, and Kildare. These and other properties were located in Chicago, Illinois; Lake Forest, Illinois; Cohassett, Massachusetts; Huntsville, Alabama; Raphine, Virginia; Harbor Springs, Michigan; and Toronto, Canada. Also included are drawings for McCormick family investment properties and charities, including Assuit College (Egypt); Astral Apartments (Brooklyn, New York); Harrison Avenue Estate (Boston, Massachusetts); McCormick Hospital (Chiengmai, Siam (Chiang Mai, Thailand)); University of Nanking (Nanjing, China); Pyengyang Christian Academy (Korea); Pimlico Buildings (London, England); Riverside Buildings (Brooklyn, New York); Shantung Christian University (Tsinan (Jinan), China); Soho Estate (London, England); Tusculum College (Greenville, Tennessee); Union Theological College at Paak Hak Tung (Canton (Guangzhou), China); Theological Seminary of the Presbyterian Church in Chosen (Pyengyang, Korea); and the Dr. C.O. Gray Residence (Greenville, Tennessee). Several genealogical charts are also present as well as drawings from Harold F. McCormick aviation experiments.