. "70000236" . . . "The Monadnock Building (historically the Monadnock Block; pronounced /m\u0259\u02C8n\u00E6dn\u0252k/ m\u0259-NAD-nok) is a skyscraper located at 53 West Jackson Boulevard in the south Loop area of Chicago, Illinois. The north half of the building was designed by the firm of Burnham & Root and built starting in 1891. The tallest commercial iron frame building with a load-bearing exterior masonry wall ever constructed, it employed the first portal system of wind bracing in America."@en . . . . "Monadnock Building"@en . "1970-11-20Z"^^ . . "1891Z"^^ .