NORTH SIOUX CITY, S.D. — Sterling Computers has purchased an 82,829-square-foot office building in North Sioux City for $4.7 million. The property, which is connected to a 105,938-square-foot distribution center, is situated on 5.7 acres within the former Gateway Computer Campus. Chris Bogenrief of NAI United represented the seller, Keating Resources, in the transaction. Keating purchased the 750,000-square-foot, six-building campus in January and plans to sell all of the buildings to local companies.