SINGAPORE (BLOOMBERG) - Amazon is planning to take over some of Citigroup's office space in Singapore at a time when a number of the e-commerce giant's Chinese tech rivals are expanding here.

The online retail giant will lease three floors covering about 90,000 square feet (8,360 square metres) at Asia Square Tower 1 in the heart of the financial district, according to people with knowledge of the plans. Staff will move into the new offices early next year, the people said, asking not to be identified because the plans aren't public.