The Instituto de Astronomia of the Universidad Nacional Autonoma de Mexico (UNAM) along with Instituto Nacional de Astrofisica, Optica y Electronica, the University of Arizona and the Smithsonian Astrophysical Observatory are developing the Telescopio San Pedro Martir (TSPM) project, a 6.5m diameter optical telescope. M3 Engineering & Technology Corp. (M3) is the design and construction management firm responsible for all site infrastructure, enclosure and support facilities. The Telescopio San Pedro Martir project (TSPM) will be located within the San Pedro Martir National Park in Baja California, Mexico at 2,830 m. above sea level, approximately 65 km. east of the Pacific Ocean, 55km west of the Sea of Cortes (Gulf of California) and 180km south of the United States and Mexico border. The aim of the paper is to present the preliminary design of the site infrastructure, enclosure and support facilities to date and share the design and construction approach.