Silverstein Properties and its mainland Chinese partner Qianhai International Energy Financial Center bought the large plot in Qianhai Bay for commercial use on Thursday, according to Shenzhen's land authority.

Despite being touted as a "mini-Hong Kong" financial and yuan hub, Qianhai had so far struggled to attract interest from Hong Kong and overseas property developers in a series of land auctions.

This latest bid, however, is the most expensive plot of land ever sold in the booming southern Chinese city of Shenzhen - a high-tech, manufacturing and services hub - smashing the previous 7.18 billion yuan land sale record for another Qianhai land plot in July last year by mainland Chinese Developer Excellence Real Estate Group Ltd.

Qianhai authorities weren't immediately available for comment.

Focused on finance, logistics and IT services, the Qianhai Bay economic zone, an hour by car from Hong Kong, hopes to draw on the financial centre's expertise as a hub for the renminbi, or offshore yuan, as it seeks to provide the same services in renminbi, bond and equity offerings, insurance products and trade settlement.

New York-based Silverstein Properties, developer for the World Trade Centre in New York, has joint ventures in Europe, Asia and the Middle East.

(Reporting By Alice Woodhouse and Yimou Lee; Editing by James Pomfret and Jeremy Laurence)