The AT&T Madison Complex Tandem Office is a 17-story, 79 m (259 ft) building in Los Angeles, California, completed in 1961. With its microwave tower, used through 1993, bringing the overall height to 137 m (449 ft), it is the 29th tallest building in Los Angeles. The building serves 1.3 million phone lines in area code 213, and other Los Angeles area codes, for foreign long-distance calling.
| AT&T Madison Complex Tandem Office | |
|---|---|
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 | |
| Alternative names | AT&T Switching Center PacBell Tower Pacific Telephone Tower SBC Building SBC Communications Switching Station |
| General information | |
| Type | Commercial offices Switching station |
| Location | 420 South Grand Avenue Los Angeles, California |
| Coordinates | 34°03′03″N 118°15′09″W / 34.050750°N 118.252614°W / 34.050750; -118.252614 |
| Completed | 1961 |
| Owner | AT&T |
| Height | |
| Antenna spire | 136.55 m (448.0 ft) |
| Roof | 79 m (259 ft) |
| Technical details | |
| Floor count | 17 |
| Design and construction | |
| Architect(s) | John B. Parkinson Donald D. Parkinson |
| References | |
| [1][2][3][4][5] | |
The site plays host to technology used in the NSA's Fairview surveillance program.[6][7]