parks. The development of an airport city has significantly accelerated in recent years. Frankfurt Airport Centres The Frankfurt Airport Centre 1 (FAC 1) near Terminal 1 offers office and conference facilities, the newer FAC 2 is located within Terminal 2 and offers office space for airlines. Airport City Mall The Airport City Mall is located on the landside of Terminal 1, departure hall B. It offers national and international retailers and label stores, a supermarket and several restaurants. The Squaire The Squaire is an office and retail building with a total floor area of . It is directly connected to Terminal 1 through a connecting corridor for pedestrians. The accounting firm KPMG, Lufthansa and two Hilton Hotels (Hilton Garden Inn Frankfurt Airport with 334 rooms and Hilton Frankfurt Airport with 249 rooms) occupy space in The Squaire. Main Airport Centre The Main Airport Centre, named after the Main river, is an office building with ten floors and about of office space. It is located at the edge of the Frankfurt City Forest near Terminal 2. Sheraton Hotel & Conference Centre Sheraton Hotels and Resorts offers 1,008 guest rooms adjacent to Terminal 1 and a conference centre for up to 200 delegates. Gateway Gardens Gateway Gardens is a former housing area for the US Air Force personnel based at the Rhein-Main Air Base, close to Terminal 2. Like the air base, the housing area was closed in 2005. Since then the area is being developed into a business location for airport-related companies. Lufthansa moved its airline catering subsidiary LSG Sky Chefs to Gateway Gardens, Condor and SunExpress are headquartered here. DB Schenker, the logistics company of Deutsche Bahn, have built a high-rise building. In December 2019, local trains were re-routed to run via Gateway Gardens station. The new stop for S-Bahn trains is located between Frankfurt Airport Regional Station and Frankfurt-Stadion station. The journey time will increase by 4 minutes but Deutsche Bahn have stated that they will use new trains (ET423) which will be faster and have more capacity. Further users Fraport's facilities are on the property of Frankfurt Airport. Its head office building is by Gate 3. The newly constructed headquarters were inaugurated there in 2012. The Fraport Driving School (Fraport Fahrschule) is in Building 501 of CargoCity South (CargoCity Süd). Lufthansa's main building, where the board of directors is seated, is called Lufthansa Aviation Centre (LAC). Lufthansa operates