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NEW YORK CITY — Starr has signed a 20-year, 275,000-square-foot office headquarters lease in Midtown Manhattan. The global investment and insurance organization will occupy the entirety of floors 16 through 27 at 343 Madison Avenue, a 46-story, 930,000-square-foot building that is currently under construction. John Picco, Peter Van Duyne and Alex Lachmund of Cushman & Wakefield represented Starr in the lease negotiations. Peter Turchin, John Maher, Evan Haskell and Caroline Merck of CBRE represented the landlord, BXP, formerly known as Boston Properties, which expects to complete 343 Madison Avenue in 2029.