hong kong flat Posted By Roberta Murphy Thompson on April 21, 2018 photo of Hong Kong flat that sold for $57 million. Related Posts:Hong Kong Luxury Real Estate on a RollMost Expensive Cities in the WorldEffective Waterproofing Solutions for Flat RoofsSotheby's Realty Debuts in San DiegoCommon Problems Related to Flat Roofing SystemsWant to Live in a Most Expensive City?