The Lightstone Group is a privately held real estate investment company that owns and operates a portfolio of multifamily, office, industrial, hotel, life sciences, and retail properties. Founded by David Lichtenstein following his first property purchase in June 1986, the company has since invested in both individual real estate assets and real estate operating companies. As of November 2024, Lightstone manages more than 200 properties with over $12 billion in assets under management.