SL Green Realty Corp (NYSE: SLG) is a publicly traded real estate investment trust and Manhattan's largest office landlord. The company's predecessor, S.L. Green Properties, was formed in 1980 by Stephen L. Green, and the current entity was established in 1997 when it went public. Headquartered at One Vanderbilt Avenue in New York City, SL Green operates as a fully integrated REIT focused on acquiring, managing, and maximizing the value of Manhattan commercial properties. The firm's investment strategy centers on office and retail assets in prime Manhattan locations, with particular concentration in Midtown, Midtown South, and Downtown submarkets. The company's portfolio includes several prominent buildings such as One Vanderbilt, One Madison Avenue, One Astor Plaza, 461 Fifth Avenue, and the Pershing Square Building. SL Green's business model derives revenue through leasing office and retail space, investment management through joint ventures with institutional investors, and debt and preferred equity investments. The company has pursued a geographic concentration strategy focused exclusively on Manhattan, positioning itself as a pure-play New York City office REIT. Manhattan represents 100% of the company's portfolio, with assets concentrated in the city's most active submarkets. In recent years, SL Green has completed several acquisitions to strengthen its position in premier Manhattan locations, including the January 2026 purchase of Park Avenue Tower for $730.0 million and 346 Madison Avenue for $160.0 million.