The Arizona Museum of Natural History project consists of a 20-year master plan analysis evaluating museum expansion needs related to City of Mesa growth, exhibit displays and staffing requirements. The initial five-year plan identified a 35,000 square foot building addition housing a major dinosaur exhibit. The multi-level building includes administration needs, changing galleries and an expanded history wing. This addition had 28,000 visitors in the first month after opening and has doubled the past annual attendance.