Stone & Kelso, LLC Purchased 36,513 square feet at 2619-2651 N. Stone Avenue in Tucson, from Ervin and Beverly Martens for $689,000. Robert Glaser, SIOR, CCIM and Paul Hooker, Industrial Specialists and Allan Mendelsberg, Investment Specialist with Cushman & Wakefield | PICOR Commercial Real Estate Services represented the Seller in this transaction while Frances Ballou-Horner with Centra Realty represented the buyer.