Cincinnati-based TriHealth confirmed today that it will expand its presence in Anderson Township by building a surgery center, which will be about a quarter-mile from rival Mercy Health’s Anderson Hospital.  The developer is Hemmer Management Group of Fort Mitchell, which will lease the space to TriHealth. The developer hired Paul Hemmer Construction of Covington as contractor and GBBN Architects of downtown Cincinnati to build the core and shell of the building. KZF Design of downtown is handling engineering.