Seoul Tower. Built in 1969 at a cost of approximately US$2.5 million, Seoul Tower was completed on 3 December 1971, designed by architects at Jangjongryul though at the time the facility interior was not furnished. N Seoul Tower opened to the public in October 1980 Since then, the tower has been a landmark of Seoul Tower elevation ranges from 236.7 m (777 ft) at the base to 479.7 m (1,574 ft) above sea level. Seoul Tower had its name changed to N Seoul Tower in 2005, with the “N” standing for ‘new’, ‘Namsan’, and ‘nature.’