HONG KONG—Hong Kong developer Hang Lung Properties said it was unable to complete the purchase of a property owned by the U.S. consulate as scheduled on Wednesday because it involved foreign affairs between China and the United States. The latest twist in the $331.5 million deal in an upscale location in the financial hub comes amid growing tension between the world’s two biggest economies over a host of issues. The developer, which agreed in September to buy the property used to house U.S. consulate staff, said in a filing on Wednesday it received a letter from the Land Registry last week that the property is “not an ordinary real estate property.” According to the letter, the Chinese regime has advised the Hong Kong government that if the U.S. Consulate General intends to rent, purchase, or sell any real estate in Hong Kong, the U.S. government must make a written application …