(Repeats to additional subscribers with no changes to text)
DUBAI, Oct 10 (Reuters) - Dubai said on Monday it had started building what would be the world's tallest tower, another record for the city that is already home to the highest skyscraper - the Burj Khalifa.
The Tower at Dubai Creek Harbour - a joint venture between Emaar Properties and Dubai Holding, the investment vehicle of the emirate's ruler, Sheikh Mohammed bin Rashid al-Maktoum - will be completed in 2020, Dubai's government said.
Its statement did not say how high the tower would be nor how much it might cost.
Guinness World Records defines a tower as a structure in which less than 50 percent of the total height is useable floor space. The world's tallest tower is the Tokyo Sky Tree, a 634-metre-high broadcasting, restaurant and observation tower.
Dubai, a major tourism and entertainment centre, is continually laying plans for new attractions. Its new tower, part of a plush new residential area next to a waterfront, will feature several garden-themed observation decks, it said.
The Burj Khalifa is 829.8 metres (2,722 feet) high. (Reporting by Hadeel Al Sayegh; Writing by Andrew Torchia; Editing by Louise Ireland)