Tri-State Realty takes great care to provide the most ethical and informed real estate advisement to our clients. We believe that helping our clients make excellent real estate decisions requires detailed attention to help you evaluate your choices and a course of action.In 1989, Gurnee-based Tri-State Realty, Inc. was incorporated as a full-service, locally owned commercial and industrial real estate firm licensed in Illinois and Wisconsin specializing in corporate real estate services.