AT&T Madison Complex Tandem Office

{{About|the switching center in Los Angeles|the one in New York City|811 Tenth Avenue{{!}}811 Tenth Avenue}}

{{Use American English|date=May 2023}}

{{Use mdy dates|date=May 2023}}

{{Infobox building

| name = AT&T Madison Complex Tandem Office

| image = PacBellTower01.jpg

| image_size = 250px

| caption =

| alternate_names = AT&T Switching Center
PacBell Tower
Pacific Telephone Tower
SBC Building
SBC Communications Switching Station

| location = 420 South Grand Avenue
Los Angeles, California

| coordinates = {{coord|34.050750|-118.252614|region:US-CA|display=inline,title}}

| completion_date = 1961

| building_type = Commercial offices
Switching station

| antenna_spire = {{convert|136.55|m|abbr=on}}

| roof = {{convert|79|m|abbr=on}}

| floor_count = 17

| elevator_count =

| cost =

| floor_area =

| architect = John B. Parkinson
Donald D. Parkinson

| structural_engineer=

| main_contractor =

| developer =

| owner = AT&T

| management =

| references = {{CTBUH|4425}}{{Cite web |url=https://www.emporis.com/buildings/116497 |archive-url=https://web.archive.org/web/20160307022111/https://www.emporis.com/buildings/116497 |url-status=usurped |archive-date=March 7, 2016 |title=Emporis building ID 116497 |work=Emporis}}{{Glass Steel and Stone|3625}}{{SkyscraperPage|3808}}{{Structurae|20009340}}

}}

The AT&T Madison Complex Tandem Office is a 17-story, {{convert|79|m|abbr=on}} building in Los Angeles, California, completed in 1961. With its microwave tower, used through 1993, bringing the overall height to {{convert|137|m|abbr=on}}, it is the 47th 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.

The site plays host to technology used in the NSA's Fairview surveillance program.{{cite web | last1=Gallagher | first1=Ryan | last2=Moltke | first2=Henrik |last3=Poitras|first3=Laura| title=The NSA's Spy Hub in New York, Hidden in Plain Sight | website=The Intercept | date=November 16, 2016 | url=https://theintercept.com/2016/11/16/the-nsas-spy-hub-in-new-york-hidden-in-plain-sight/ | access-date=December 1, 2023}}New York Times, [https://www.nytimes.com/2015/08/16/us/politics/att-helped-nsa-spy-on-an-array-of-internet-traffic.html?_r=0 AT&T Helped U.S. Spy on Internet on a Vast Scale] & Pro Publica, [https://www.propublica.org/article/nsa-spying-relies-on-atts-extreme-willingness-to-help NSA Spying Relies on AT&T’s ‘Extreme Willingness to Help’], August 15, 2015.