A big white and gray box with windows and blue accents in the middle of an industrial park’s busy highway. That is what the CyrusOne Data Center in Aurora looks like. The Chicago Mercantile Exchange, or CME, Group Data Center next door looks similar. But before you see the warehouse-like buildings, you might hear them first. On a sunny day with few clouds and low wind, and after new regulation, the center was not as loud as it could be. In fact, the nearby traffic was often louder. Mercy Davison, director of planning and zoning for the Town of Normal, and a staffer and intern took a tour of the outside of the CyrusOne facility on such a day.