High Quality Content by WIKIPEDIA articles! The 21st Century Tower is a 55-story skyscraper along the Sheikh Zayed Road in Dubai . At a height of 269 m (883 ft) it is the world`s third-tallest residential building. When it was completed in 2003 it took the title of the world`s tallest residential building, but later the Eureka Tower in Melbourne, Australia and the Q1 tower in Australia`s Gold Coast bumped it to its current position.