SL Green Realty Corp., an S&P 500 company and Manhattan's largest office landlord, is a fully integrated real estate investment trust, or REIT, that is focused primarily on acquiring, managing and maximizing value of Manhattan commercial properties. As of September 30, 2020, SL Green held interests in 93 buildings totaling 40.6 million square feet. This included ownership interests in 29.2 million square feet of Manhattan buildings and 10.3 million square feet securing debt and preferred equity investments.