Tenants. Welcome to Aon Center's Tenant Portal. A project from notable . The Residential Landlord and Tenant Ordinance governs the majority of residential rental agreements in the City. About 600 W Diversey Pkwy Chicago, IL 60614. The building has new modern amenities including a tenant lounge, fitness center, yoga studio and bike storage. Twenty years ago Chicago's historic Montgomery Ward catalog building was redeveloped into a tech destination known as 600 West Chicago.