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NEW YORK CITY — Jones Lang LaSalle (JLL) has completed a lease for 64,788 square feet of office space at One Astor Plaza, a 1.9 million-square-foot office tower located at 1515 Broadway in Manhattan, New York City. Engineering firm Syska Hennessey Group will occupy the space, which represents the entire 14th and 15th floors, for a 15-year term under a direct lease. It is relocating from its previous offices at 11 W. 42nd St. Peter Riguardi and Cynthia Wasserberger of JLL represented the tenant in lease negotiations. Frank Doyle and David Kleiner, also of JLL, represented the landlord, SL Green Realty Corp. Syska Hennessey plans to pursue LEED certification for the new office space.