C. Y. Lee's 2004 Taipei tower — 508 m with a 660-ton tuned mass damper visibly suspended near the top.
From Wikipedia
Taipei 101, formerly known as the Taipei World Financial Center, is a 508-meter, 101-story skyscraper in Taipei, Taiwan. It is owned by the Taipei Financial Center Corporation. It was officially classified as the world's tallest building from its opening on 31 December 2004, until it was surpassed by the Burj Khalifa in 2009. As of 2026, it is the tallest building in Taiwan and the eleventh tallest in the world.