NEW YORK, Dec. 09, 2024 (GLOBE NEWSWIRE) -- SL Green Realty Corp. (NYSE: SLG), Manhattan's largest office landlord, today announced a series of transactions at 100 Park Avenue, including a new 220,221 square-foot lease with global professional services firm, Alvarez & Marsal Holdings, LLC, a modification that extends and upsizes the existing $360.0 million mortgage, and the signing of a purchase option agreement to acquire its partner’s 49.9% interest in the property.