Hewitt Office Campus - When the entire facility is built out in five to seven years, the sprawling campus will potentially hold between 4,500 and 5,000 employees in 10 to 11 buildings, making it Hewitt’s second-largest office complex behind the company’s headquarters in Lincolnshire, Illinois, just outside of Chicago. The low-rise campus will consist of buildings between four and six stories tall. The four core buildings of Phase I are connected in pairs to a central atrium and the glass-clad buildings blend with The Woodlands’ natural environment.