Mainland China’s investments in overseas properties plunged last year amid stringent capital controls and a push by the government to get companies to put their money into belt and road infrastructure projects instead.The vacuum left behind has opened up opportunities for other Asian countries to increase their global real estate portfolios, according to analysts. South Korea in particular has benefited.In 2018 and the first quarter of this year South Koreans spent US$3.47 billion on overseas…