SL Green Realty Corp. | 31,188 followers on LinkedIn. NYC's largest office landlord—acquires, manages & maximizes the value of Manhattan commercial properties. | SL Green Realty Corp., Manhattan's largest office landlord, is a fully integrated real estate investment trust, or REIT, that is focused primarily on acquiring, managing and maximizing the value of Manhattan commercial properties. As of June 30, 2025, SL Green held interests in 53 buildings totaling 30.7 million square feet. This included ownership interests in 27.2 million square feet of Manhattan buildings and 2.7 million square feet securing debt and preferred equity investments.