 While there are no official boundaries (except for the CID, which is a 5½-square-mile area that includes the interchange of I-75, I-285 and U.S. Highway 41), the business district generally extends as far northeast as the Wildwood Office Park on Powers Ferry Road, and up Cobb Parkway, the district's main street.Windy Hill Road is generally the northern extent of the district.To the south and west, it extends down Cumberland Parkway and Paces Ferry Road.