PLAINVIEW, N.Y. — Williams Real Estate has brokered a $35 million lease that will relocate defense contractor Cox & Co. from Manhattan to a 250,000-square-foot facility located on Long Island at 1650 Old Country Rd. in Plainview. Cox will occupy 90,000 square feet of the single-story building. The tenant build-out for the new space will be completed by Long Island-based Steel Equities. Robert Tunis and Richard Warshauer of Williams Real Estate represented Cox in lease negotiations. The brokerage firm also arranged a deal where the landlord for Cox’s old office space will buy out the last two years of the tenant’s lease. Steel Equities also located a user for the remainder of the space in the. Plainview building. Sales and property tax relief, as well as reduced energy costs, were provided by the Nassau County Industrial Development Agency and the Long Island Power Authority. Williams Real Estate is the New York-area hub of FirstService Commercial Real Estate.