What is esi design? NBBJ's New York experience design studio, ESI Design, seamlessly weaves the physical and digital worlds together to create immersive experiences with enduring impact.What is the largest esi facility? Our 46,000+ square foot Illinois facility is the largest in the ESi system and one of the most up-to-date multidisciplinary testing, laboratory, and inspection facilities in our industry - ideally suited for hosting inpidual and multi-party inspections of all sizes.Where is esi located in illinois? The Aurora, Illinois operation of ESi is located just outside of Chicago and is the founding office for the company. The Aurora office offers expertise in nearly every ESi discipline and specialty area, including:Why choose aurora for esi services? The Aurora office offers expertise in nearly every ESi discipline and specialty area, including: The professional staff is very experienced, most with over two decades in their field, with the vast majority having advanced degrees and specialized certifications in their area of expertise.