Lotte World Tower

The first design was made in the year 1990, and changed further in 1994, 1995 and 1997. Following the revision of the bird's eye view from 2004 to 2006, the bird's eye view was changed seven times in 2008 and the design was changed in 2009 and the Lotte World Tower began to break ground.[6]

The Shard of England is said to be similar in design. The Shard, the design of renowned Italian architect Renzo Piano, was launched in 2008, completed in 2012 and opened in 2013. Its interior and elevator atmosphere are similar. Also, space externally on the roof tower is similar.

On March 17th, 2016, before the final phase of external construction, the Diagrid lantern-shaped roof structure was completed. The roof structure was constructed with steel counterparts that are each 12 meters and weigh 20 tons. The counterparts were made up of bent metal panels that are 6 cm thick. The structure itself is 120 meters high, and covers floors 107–123. Approximately 3,000 tons of steel parts, a high-precision 64t tower crane and GPS alignment systems, as well as highly skilled welding technicians were used in the construction of the roof. The roof structure is engineered to withstand its weight without reinforcing pillars, endure earthquakes up to a magnitude of 9 under the Richter magnitude scale and winds up to 80 m/s.[7]

Seoul Sky is located on the 117th - 123rd floors of Lotte World Tower in Sincheon-dong, Songpa-gu, Seoul, Korea. The 117th floor is the entrance floor and the view floor; the 118th floor has the Sky Friendly Cafe and Sky Terrace; the Photozone on the 119th floor; Seoul Sky Cafe on the 122nd floor; 123 lounge, which is a premium lounge bar, is on the 123rd floor. There are four media stands on the 117th and 118th floors. The view floor has prominent views of the city, as well as a glass floor and a telescope. The sky skylight of Seoul Sky was the highest glass floor observatory as of the tower's completion. Lotte Tower and One World Trade Center have concluded an operation and technical service agreement.[9][10]

In 2016, two Russian and Ukrainian urban explorers, Vadim Makhorov and Vitaly Raskalov from Ontheroofs, illegally climbed the under-construction Lotte World Tower through stairs and Vitaly Raskalov then free-climbed up the crane on the tower's top.[11][12] The video was viewed over 3 million times as of September 2016 and received worldwide media attention.[13][14] Following the climb, Lotte World Tower released posters with the photos of Vitaly Raskalov and Vadim Makhorov and banned them from the building.[15][16]

In 2013 and 2014, 3 construction workers died during the construction of the tower, and an executive director of Lotte's construction arm was given a suspended sentence of 8 months in prison in 2016 for his role in neglecting safety measures at the site.[17] In December 2014, the Seoul city government ordered the mall and cinema complex at the base of the tower, which opened before completion of the tower, to be closed for 5 months after water was found leaking from an internal aquarium. Independent engineers who assessed the building found that these issues bore little relation to the overall structural integrity of the building and the mall and cinema complex reopened in 2015.[18]