City Developments Ltd. (CDL)—controlled by billionaire Kwek Leng Beng and his family—has sold 57% of a prime residential project in the Singapore central business district during the weekend launch, adding to signs demand remains robust in one of the world’s most expensive real estate markets.

The company said 140 of the 246-unit Newport Residences on Anson Road on the edge of the central business district were sold at S$1.3 million ($1 million) for the one-bedroom apartments measuring 431 square feet (40 square meters) and as much as........

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