Who is graycor construction company? In the 1920s, Graycor’s predecessor, the Chicago Concrete Breaking Company, began providing specialty contracting services throughout Chicagoland. Over the next 100 years, Graycor grew into a group of companies that now include Graycor Construction Company, Graycor Industrial Constructors, Graycor Southern Inc. and Graycor International.What are graycors operating units? Established in 1921, Graycor functions under three major operating units - Graycor Industrial Constructors Inc., Graycor Construction Company Inc., and Graycor Southern Inc. 4600 East Washington StreetWhy choose graygraycor southern inc? Graycor Southern Inc. builds with our company’s core values in mind – emphasizing integrity and quality with each project. The delivered results are at an unmatched level due to our expert team of professionals who are trained, qualified and well-equipped to bring your vision to fruition in a way that is sure to exceed your expectations.