Site Plans Developed in two phases, NorthPark offers more than five million-square-feet of office, industrial, retail and hospitality space designed for growing companies looking to expand their Midwest operations. With phase one site infrastructure improvements coming to completion, preparation for initial phase two work has already begun. The images below outline site plans for the mixed-use development, as well as its boundaries. NorthPark is situated northeast of the I-70/I-170 intersection, with direct paths to major roads, highways, airways and light rail connections. Minutes from Lambert-St. Louis International Airport, NorthPark is the ideal location in a diverse region.