Height - Above sea level: 479.7m/1,574ft - Seoul Tower: 236.7m/777ft (monument structure 135.7m/445ft + steel monument 101m/332ft) Space: 8,456m2 Floor space : 3,986m2 Total floor space: 15,378m2 Total Area of observatory: 2,403m2 -1 Fl observatory: 450m2 -2 Fl observatory: 460m2 -3 Fl observatory: 466m2 -Outside observatory: 269m2 -Rotation observatory: 271m2(rotation area 149m2) * Time for one rotation: 48 min -Miscellaneous Area: 483m2 Material Used - Steel: 2,060ton - Cement: 3,700ton Capacity of observatory: simultaneously 1,100 person(s) High speed elevator - number allocated: 2 - speed: 240 minute/787ft - capacity: 24 people(1,600 kg) Safe wind velocity: high speed winds at the 56 m level safety is guaranteed Safety inspection - in 1973. 05. 21 the official international organization recognized the safety, 7 more tests were conducted which are met safety standards until 2000, 07.