Northpark Office Towers (400 & 500) Atlanta, Georgia Stories: Two 18-story towers Total Area: 1,225,000 s.f. (113,800 sm) The Northpark office tower complex provides more than a million square feet of Class-A office space in a suburban setting with urban conveniences, including easy access to commuter rail service and retail areas. The building features a rooftop park and restaurant with a cascading waterfall, as well as a health club and structured parking.