Cheung Kong (Holdings) has expanded its promotional campaign to southern China, where it hopes to sell 70 luxury residential homes worth $1.3 billion during the week-long National Day holiday. The project it is pushing, the Harbourfront Landmark in Hunghom, will be launched in Dongguan, Guangdong province, today. The flats, which measure between 1,900 and 2,153 square feet, are priced at an average $7,200 per square foot, or about $13 million to $15 million. Cheung Kong executive director Justin Chiu Kwok-hung said prices for the latest sale were about 5 per cent higher than for those units in the development sold last year. He said property agents had lined up about 200 mainland buyers to visit the new show flats in Hong Kong before today's launch in Dongguan. The units will be exhibited in Dongguan until October 5. The promotional campaign will also take place at a property trade fair in Shanghai from Friday to Monday. To encourage sales, Mr Chiu said Cheung Kong would pay commissions of up to $26 million to agents if they sold all of the available units. Meanwhile, the group plans to bring forward the Harbourfront Landmark's promotional schedule in Beijing to next month. Its schedule was originally set for November and December. 'Property agents in Beijing have received numerous inquiries about the sale schedule and told us it was better to go there earlier,' Mr Chiu said. He said Cheung Kong had sold about 140 units to mainland buyers this year, largely from the Harbourfront Landmark and One Beacon Hill development in Kowloon Tong. There are 324 units in Harbourfront Landmark.