[Oakbrook Corporation | Home Headquartered in Madison, Wisconsin, Oakbrook Corporation is a fully integrated real estate firm that delivers a comprehensive range of real estate serives including, property management, investment sales, brokerage, and consulting. Oakbrook is one of the Midwest region’s largest real estate service providers, with a combined portfolio of over 11 Million square feet under management, including 7,500 apartments and 35 office and industrial buildings, ]