China’s biggest-ever overseas property buying spree reversed course in dramatic fashion in 2018. But even after the record unwinding, many lucrative real estate assets remain in Chinese hands.They include the 245 Park Ave skyscraper in Manhattan, New York’s famed Waldorf Astoria Hotel and Chicago’s Vista Tower, under construction but envisaged as one of the city’s tallest buildings.With economic growth slowing, keeping a tight rein on capital outflows is expected to remain a key theme for Beijing.