The "63 Building," also known as the 63 City, is a prominent skyscraper located in the Yeouido district of Seoul, South Korea. Completed in 1985, it stands at 264 meters tall and was the tallest building in the country until 2016. The building features a gold-tinted glass exterior, which reflects sunlight and gives it a distinctive appearance. Inside, the 63 Building houses various facilities, including offices, a shopping mall, and an aquarium. It also has an observation deck on the 63rd floor, offering panoramic views of the Han River and the surrounding cityscape. The building is a popular tourist destination and a symbol of modern architecture in Seoul.