SL Green Realty Corp., is a privately owned real estate investment manager and fully integrated real estate investment trust, or REIT, that is focused primarily on acquiring, managing and maximizing value of Manhattan commercial properties. As of December 31, 2024, SL Green held interests in 54 buildings totaling 30.6 million square feet. This included ownership interests in 27.0 million square feet of Manhattan buildings and 2.8 million square feet securing debt and preferred equity investments. It was founded in 1980 and is headquartered in New York.