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BAY SHORE, N.Y. — Duro Dyne National Corp., a manufacturer of sheet metal accessories and equipment for the HVAC industry, has extended its single-tenant lease at 81 Spence St., a 128,600-square-foot industrial building located in the Long Island community of Bay Shore. The extension runs through 2035. A partnership between Metropolitan Realty Associates and Angelo Gordon owns the building, which features a clear height of 24 feet, 10 loading docks and two drive-in doors. No outside brokers were involved in the deal.