Premier Health has bought the assets of a Middletown business. The hospital network’s southernmost hospital, Atrium Medical Center, purchased Southwest Ohio Ambulatory Surgery Center’s 10,400-square-foot building at 295 N. Breiel Blvd. in Middletown for $2 million this week. The network has acquired the building and equipment of the practice, which provides general and multi-specialty surgery, has been in operation since 1997. Dayton Business Journal research shows it is the 11th-largest outpatient…