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UPPER SADDLE RIVER, N.J. — New Jersey-based brokerage firm Wellington Real Estate has negotiated the sale of Sherbrooke Office Center, a 75,000-square-foot building in Upper Saddle River, located near the New York-New Jersey border. The four-story building is located at 600 E. Crescent Ave. Wellington represented the seller, Sherbrooke Holding Co. LLC, in the transaction. Additional terms of sale were not disclosed.