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Show Cuiit cn Air Lots The Merchandise Mart is built over tracks of the Chicago & I'orth Western railway. The railroad rail-road retains ownership of the area on which its tracks operate. It sold air lots, representing, possession posses-sion of the space above' ground occupied by the entire building, and numerous miniature ground lots necessary to sink caissons. The air was actually subdivided Into lots and the diagram of the aerial real estate filed in the office of the recorder of deeds of Cook county, 111. |