A veterans’ service agency is getting a new building and a local developer has a chance to build a mixed-use project after they agreed to exchange buildings near the Beverly train station.

North Shore Veterans Counseling Services,  which runs its program and a rooming house at 9 Park St., is acquiring a vacant former rooming house at 45 Broadway from Windover Construction,  while Windover will receive the Park Street building. The sales are set to close on Dec. 20.