Hang Lung Properties Limited , the operating arm of Hang Lung Group Limited , is a leading Hong Kong company boasting an extensive real estate portfolio in Hong Kong, as well as building, owning and managing world-class commercial complexes in key cities on the Mainland since the 1990s. It is a constituent stock of Hong Kong's Hang Seng Index and the Hang Seng Corporate Sustainability Indices, and is one of the world's largest pure real estate listed companies by market value.