The landmark Hess tower in Woodbridge may be getting some company in the years ahead. That’s according to a plan laid out Wednesday by developer Ed Russo, whose firm is part of a joint venture that aims to acquire and transform some 30 acres around the iconic building. He said the Carlstadt-based firm and its partner, Onyx Equities, intend to build a mixed-use community with roughly 600 residential units and 40,000 square feet of retail space.