City of Tualatin Heritage Trees, 18880 SW Martinazzi Avenue, Tualatin, Oregon, 97062. Telephone: 503-691-3060. The program is managed by the Tualatin Parks and Recreation Department. Connect to the online PDF nomination form. A brochure and map of tree locations is viewable online or may be printed. An online tour, via a heritage tree map is also viewable on the city’s website.