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NEW YORK CITY — Locally based general contractor Omnibuild has begun the gut renovation of 122 Fifth Avenue, a 300,000-square-foot office building in Manhattan’s Union Square neighborhood. Project partners include developer/owner Bromley Cos. and STUDIOS Architecture. The project will upgrade the existing building’s MEP systems and elevators and install a rooftop pavilion with green space and seating areas. In addition, the development team will add a new 10-story structure along 17th Street.