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CHICAGO — Data Stream LLC, a technology services company, has signed a 7,882-square-foot, long-term lease at the Chicago Board of Trade Building in The Loop neighborhood of downtown Chicago. The company plans to build and maintain a service-oriented data center at the location. Houston-based Data Stream officially entered the Chicago market in August when it signed a 1,459-square-foot lease at the Chicago Board of Trade Building to house its regional sales team. GlenStar Properties LLC and partner USAA Real Estate Co. purchased The Chicago Board of Trade Building in April 2012. Built in 1930, the 44-story building spans 750,000 square feet.