Full amenities package within park. 15 minutes from O'Hare. 30 minutes from downtown Chicago Hamilton Lakes Business Park is located at the intersection of Thorndale Avenue and I-355. The Park is located just inside DuPage County, which translates into much lower taxes for our tenants. This is a master-planned development of approximately three and one-half million square feet of office space and 80 additional acres of development land. Within the Park, one will find first-class hospitality in the Westin Hotel. Beautiful indoor and outdoor public spaces are well established. Additional amenities include; a fitness center, daycare center, full service restaurants, delicatessens, and a florist. Design at Hamilton Lakes conveys sophistication through the use of granite, reflective glass, lighted metal roofs and rich interior detailing throughout.