The Rosemont, IL office is home to the corporate headquarters and M. Ecker & Co. of Illinois, Inc. M. Ecker & Co. of Illinois, Inc. serves Chicago and surrounding counties, and represents our oldest and largest market. What started out as a simple painting subcontractor has grown into a multi-trade subcontractor. Our commercial division offers drywall, painting, interior steel partitions, acoustic ceilings, and rough and trim carpentry. In the nation’s third largest metropolitan area, M. Ecker & Co. of Illinois, Inc. stands out as the preeminent residential drywall and painting operation in the market.