Emery Celli Brinckerhoff & Abady, LLC (ECBA), a Manhattan-based law firm, is relocating to Rockefeller Center and expanding its office space by more than 4,000 square feet. The law firm’s new lease of 16,163 square feet will take up the entire 10th floor at 600 Fifth Ave. in New York City. ECBA will move-in to their new space August 2014.