Hempel Cos., a Minneapolis-based real estate firm, has purchased a Brooklyn Center office building for $5.45 million, according to Hennepin County real estate filings made public Tuesday. The Concorde Executive Center is a 104,063-square-foot building at 6160 N. Summit Drive in Brooklyn Center. It was sold by an entity related to Duluth-based SuperiorUSA Corporation. “We see tremendous opportunity in the Brooklyn Park market for an upgraded office destination in Brooklyn Park,” said Benjamin…