The 24th at Camelback business center is the city's most prestigious address and provides stunning views of Camelback Mountain and the downtown Phoenix skyline. It features a beautiful courtyard and two fully-furnished conference rooms. The economy of Phoenix has diversified from its agricultural beginnings as swiftly as the population has grown (it's now the fifth most populated city in the US). Bigger than the economies of many countries, it is currently home to waste management company Republic Services, electronics corporation Avnet, Apollo Group (which operates the University of Phoenix), mining company Freeport-McMoRan, retailer PetSmart, energy supplier Pinnacle West and retailer CSK Auto. Honeywell's Aerospace division is headquartered in Phoenix and Intel has one its largest sites here, employing thousands of people in chip manufacturing. The city is an economic big-hitter, a main transportation, financial and industrial center of the Southwestern US.