AT&T Switching Center, Telecommunications tower in Bunker Hill, Los Angeles, United States.
The AT&T Madison Complex Tandem Office is a 17-story building on Bunker Hill in Los Angeles, completed in 1961 and rising 79 m (259 ft). A steel microwave tower, used through 1993, brings the overall height to 137 m (449 ft). The building serves 1.3 million phone lines in area code 213 and other Los Angeles area codes for foreign long-distance calling.
The AT&T Madison Complex Tandem Office was completed in 1961 as a 17-story, 79 m (259 ft) building. Its microwave tower, in use through 1993, raised the total height to 137 m (449 ft). The building serves 1.3 million phone lines in area code 213 and other Los Angeles area codes for foreign long-distance calling.
The lobby features a large mosaic mural by Anthony Heinsbergen that incorporates actual telephone equipment to illustrate the development of communication networks. Visitors can observe how past and current technologies are woven into this artistic display.
The building stands in Bunker Hill, and its 137 m (449 ft) profile, microwave tower included, can be picked out from the street. It is an operating tandem office handling calls for area code 213 and other Los Angeles codes, so the interior is not open to visitors.
The building housed advanced surveillance technology whose true purpose remained hidden from public view for many years. This role made it a crucial but quietly operated hub within the national security infrastructure.
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