of Perimeter Center, including the mall, is located in Dunwoody, the western 60%, including most of the area's office towers, are located in Sandy Springs. Pill Hill is located in the Sandy Springs section of Perimeter Center, and is the largest medical center in Georgia. It includes Northside Hospital, St. Joseph's Hospital, and Children's Healthcare of Atlanta. More than 40% of the hospital beds in the metro area are located within Sandy Springs. Landmarks include Hammond Park, Concourse at Landmark Center, colloquially called the ‘King’ and ‘Queen’ buildings due to their distinct white crown architecture at the top of each tower, as well as two MARTA stations, the Sandy Springs and Medical Center MARTA stations. The area also includes the 400-285 highway interchange, which is currently undergoing major construction. The top three tallest suburban buildings in the country are found here, the ‘King’ and ‘Queen’, and nearby Park Towers at #3. North Springs North Springs is located in the northern portion of the city, and is generally defined as the area west of the Dunwoody/DeKalb County border, east of Brandon Mill Road, north of Abernathy Road, and south of Dalrymple Road and Spalding Drive. The North Springs MARTA station, the terminus of the MARTA Red Line, serves the district. Five of Sandy Springs’ public schools are in this area, including the newest Ison Springs Elementary School, Woodland Elementary School, Spalding Drive Charter Elementary School, Sandy Springs Charter Middle School, and North Springs Charter High School. South Springs - Sandy Springs ITP South Springs or Sandy Springs ITP, an acronym for "inside the perimeter", refers to a portion of the city which extends south of Interstate 285, colloquially referred to as "the perimeter". It is located north of the City of Atlanta border, east of the Riverside district, south of Interstate 285, and west of the Brookhaven/DeKalb County border. The southern area of this district is considered to be a part of the greater Chastain Park community of Buckhead. The public schools in this area include Ridgeview Charter School and High Point Elementary School. The popular Atlanta radio station 99X broadcasts on 98.9 from here. Powers Ferry Landing The business district just east of the river crossing is called Powers Ferry Landing, located where Northside Drive crosses the road, just east of the former landing. This provides freeway access at Northside Drive (west ramps) and New Northside Drive (east ramps, road