Upon its completion in 2003, Bruce Doblin's Chicago home was the ideal bachelor pad. Built in a former factory, the house featured large exposed beams, polished concrete floors, and a flat galvanized steel façade with large hangar doors. But when Doblin was married a few years ago, he and his wife decided they needed to expand. Their vertical two-story addition springs from the original horizontal structure, and its interior utilizes warm, natural features like white oak flooring to counter the predominantly manmade materials in the preexisting section.