Trileaf Corp

Since 1967, ESD has provided engineering design solutions for thousands of buildings in the United States and throughout the world. We have achieved our reputation through our team of experts who bring a depth of resources and experience to the needs and goals of our clients. With over 220 engineering and design professionals, ESD is one of the largest consulting engineering firms in the Midwest. We offer consulting engineering design services in mechanical, electrical, plumbing, fire protection, LEED, sustainable design, commissioning, and technology. ESD supports a diverse range of markets, including commercial, health and science, education, mission critical, residential, assembly, cultural, theaters, energy plants, transportation and international. Clients include architects, developers and property managers. We offer innovative ideas and design solutions for systems upgrades and retrofits, lower operating costs, and simplified maintenance protocols, as well as expertise in building codes. Contact us today.

Established in 1975, RJN Group Inc. is a consulting firm that provides engineering services and information technology services for infrastructure planning, design, construction, maintenance, and management. Based in Wheaton, Ill., it serves a variety of clients, including municipal, county, state and federal agencies, and sanitary districts. The representative projects include comprehensive assessment, preliminary and detailed design, construction engineering and ongoing maintenance management for infrastructure systems including water, sewer, drainage, and transportation. The Computer Aided Support System, called CASS WORKS, is an integrated approach to the computerized management of sewer, water, drainage, pavement, and treatment plants.

With over 40 years of continued service, we provide value-added, innovative staffing solutions by working together in alliance with you. Our adaptability and flexibility to support your efforts to better manage your business and increase your productivity. Call us today for more information!