owner Federico L. Martínez de Hoz. Inaugurated in 1930, was originally used as a housing called "Martinez de Hoz Building". In 1940 the federal government bought it. Valued at US$1,607,022, its street surface is 413 square meters, inside it is 5430 square meters; and it has ten floors, the fifth floor being the Secretary of Intelligence's office, and the tenth floor the special operations division. Security on the facility is meticulously strict, the whole building is covered with dark tinted windows, and when a person approaches the door, guards inquire the visitor for his or her name and the reason of visit. Once they are approved to enter, they must go through a metal detector and be accompanied throughout the visit by a staff member who will guide the visitor through the building and provide the necessary magnetic card to access restricted areas. Two annexes in Ave. 25 de Mayo are internally connected to the main facility thus extending the Secretariat's offices. Surveillance around the whole surroundings of the Presidential Palace and Plaza de Mayo is tight for obvious reasons. In the late 1960s, there was a serious incident when members of Montoneros breached the building and stayed inside for a whole weekend, taking objects, folders, and other sensitive material. During the late 1970s and 1980s, the tenth floor of the Correo Central building was provided to the Secretariat to be used for mail interception. Other facilities of unknown status: Infrastructure Communications in the agency are a crucial infrastructure and policy issue. For the southern bases in Patagonia, communications is provided by the Servicios y Tecnologia S.R.L. (SyT) company. The rest of SIDE's communications, phone tapping abilities, data transfer, etc. are handled by Telecom and Telefónica of Argentina, Movistar, Nextel, CTI Móvil, and Compañía de Radiocomuncaciones Móviles, S.A. Data processing computers for SIDE are provided by Bull. In 2001, under Secretary of Intelligence Fernando de Santibañes, the Secretariat began a major upgrade of its computer infrastructure. Personnel Recent reports (since the Secretariat does not declare the exact number of personnel it embodies) state that about 2,500 to 3,000 agents are currently working both inside and outside of Argentina for the Secretariat. Only the Secretary and the Undersecretary of Intelligence are public functionaries, the rest of SIDE personnel must act and work secretly, as stated by the Intelligence Reform Law 25.520. About 80% of the personnel works in areas dependant of