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NEW YORK CITY — Rockefeller Group has signed Mayer Brown LLP to a 49,000-square-foot lease at 1221 Avenue of the Americas, a 50-story office tower in Manhattan. The global legal services firm now occupies five floors and 235,000 square feet at the building. Mayer Brown was represented by Bob Flippin, Andrew Sussman, Lauren Crowley Corrinet and Anthony Dattoma of CBRE in the transaction. Rockefeller Group was represented by an in-house team led by Ed Guiltinan. Following the transaction, the office space at the 2.6 million-square-foot building is now 97 percent occupied.