AT&T Switching Center Los Angeles

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420 South Grand Avenue
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AT&T Switching Center Los Angeles

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The AT&T Switching Center, formerly known as the "AT&T Madison Complex Tandem Office", is one of the largest telephone central offices in the nation.

The building is actually made up of three adjoining buildings built during different years as load growth warranted. The original building has been destroyed, but was built on the same site in the 1900s as part of the Home Telephone Company. During 1907 this office had the capacity of 10,000 lines, quite a difference from today. Two new offices were built at the site in 1925, the second office was enlarged in 1945 to allow for load growth. The third office was constructed in 1961 and is 17 stories tall. Source: TheCentralOffice.com

AT&T Tower Names

As the telecom industry went through changes so have the building's name.

  • AT&T Madison Complex Tandem Office
  • AT&T Switching Station
  • SBC Tower
  • Pacific Bell Tower
  • Pacific Telephone Tower

Map and Nearby Locations:

420 South Grand Avenue
AT&T Sites
Nearby Facilities

Sites within 15 miles of AT&T Switching Center Los Angeles

Distance Site About
0.18 miles Edge Centres: Los Angeles EC101
0.18 miles Sprocket Los Angeles
0.18 miles United Layer-LA4
0.18 miles Cogent: 530 West 6th
0.18 miles HostPapa LA1
0.18 miles Telecom Center LA Building (530 West 6th)
0.18 miles Colocation America (LA4)
0.22 miles DataBank LAX1
0.23 miles US Colo (One Wilshire)
0.23 miles One Wilshire Building
One Wilshire is an iconic building in downtown Los Angeles. The 30 story building is easy to spot on the LA skyline with a giant "One Wilshire" sign at the top of the building.
0.23 miles Crown Castle LA
0.23 miles CoreSite Los Angeles (LA1) One Wilshire
CoreSite's Any2 IXP (Peering Exchange) is the largest public IXP in the Western United States. The Unity Trans-Pacific submarine cable, also lands in the building, which provides undersea connectivity to Asia.
0.23 miles Aon Center
Known as the Aon Center and owned by Shorenstein Properties, the 62-story office skyscraper hosts a number of colocation companies that offer raised floor in the building.
0.26 miles Telehouse 626 Wilshire
0.27 miles US Colo (Quinby)
0.31 miles Evocative: Los Angeles, LAX2
Evocative's LAX2 data center facility, located at 600 W 7th St, Los Angeles, was constructed in 1999. Spanning an impressive 30000
square feet building.
0.31 miles Equinix Los Angeles LA1
0.32 miles China Telecom Los Angeles
0.32 miles Aptum Los Angeles
0.32 miles AT&T Los Angeles 2
0.32 miles Verizon: (600 West 7th)
0.32 miles 600 W 7th St, Los Angeles - Digital Realty
The 7-story building at 600 West 7th is one of the best-connected buildings in Los Angeles (second to One Wilshire.) Digital Realty operates the building's Meet Me Room and offers connections into Equinix LA1 space.
0.37 miles 818 West 7th
0.37 miles Verizon: (818 West 7th)
0.37 miles Equinix Los Angeles LA2
0.37 miles Lumen Los Angeles 1
0.45 miles 800 South Hope
0.45 miles US Colo (800 Hope)
0.45 miles NYI Los Angeles
0.74 miles Equinix Los Angeles LA5
0.74 miles West 7 Center (1200 West 7th)
1.15 miles Fiberhub LAX1
1.16 miles Tata Los Angeles
1.16 miles CoreSite Los Angeles (LA2) 900 N Alameda
CoreSite's LA2 facility at 900 N Alameda is an elegant building that was built in 1940 as a Postal Annex. It was the central mail processing facility for Los Angeles until 1989. The site is now owned by CoreSite and is being incrementally converted to data center space.
1.16 miles ARP Networks
1.19 miles CoreSite LA3
3.58 miles Digital Realty: Vernon, CA
US data center operator Digital Realty acquired a 5.4-acre property in the Vernon area of Los Angeles, California, for approximately $49 million in 2025.
3.65 miles Prime Vernon
Prime Data Centers' three-story, 261,000-square-foot data center is located in Vernon, California.
3.73 miles DataBank: Los Angeles
DataBank and Goodman Group’s LAX2 project is a 32MW AI-ready data center in Vernon, California, developed through a 50/50 joint venture at 3094 E. Vernon Avenue, with 140,417 raised square feet and phased delivery beginning with 6MW in December 2026 and the balance through September 2027.
3.73 miles Goodman: Los Angeles
The 5.6-acre facility, situated on the former Farmer John site, is slated to be power shell-ready by mid-2026.
8.01 miles DigiCo: Los Angeles LAX1
A proposal by Australian firm HMC Capital to develop a 250,000 sq ft data center in Monterey Park, California, has been delayed following intense local opposition.
8.02 miles DigiCo: Los Angeles LAX2
DigiCo’s LAX2 data center in Monterey Park, 16 km east of downtown Los Angeles, is a Tier III-ready hyperscale facility now moving through power-allocation and permitting ahead of a 2027-2028 commercial launch.
9.54 miles Centersquare: Hawthorne LAX4
Centersquare’s Hawthorne facility is a massive data center with more than 288,000 Total square feet, located less than 6 miles from Los Angeles International Airport (LAX), with easy access from downtown Los Angeles.
9.75 miles 2301 West 120th, Hawthorne
10.81 miles Alchemy LAX
10.81 miles QuadraNet LAX (Century)
10.88 miles GI Partners: Culver Blvd, CA
11.53 miles 3015 Winona - Digital Realty
11.53 miles Centersquare: Burbank BR1
2 Story Structure Utility: Burbank Water and Power
11.65 miles Equinix El Segundo LA4
11.71 miles Serverfarm LAX1
The site is served by a 16.5 MW substation on-site.
11.79 miles Equinix El Segundo LA3
11.93 miles Centersquare: El Segundo LA1
11.93 miles 200 North Nash - Digital Realty
200 Nash is fully leased to Cyxtera, a Triple Net tenant
11.94 miles 2260 E El Segundo - Digital Realty
In 2010, DRT acquired this site from 365 Main. The transaction included 4 other data centers and was for a total of $725 Million
11.98 miles Evocative: Los Angeles, LAX10
Evocative's LAX10 data center facility is located at 2260 E El Segundo Blvd, El Segundo, CA. Spanning an impressive 1 square feet, this colocation site offers ample space to accommodate various data center operations and infrastructure requirements.
12.45 miles Cogent Pasadena
13.00 miles Evocative Redondo LAX14
INAP's flagship location in Los Angeles Datacenter was constructed in 2012 Electric Utility Provider: Southern California Edison
14.11 miles Equinix Los Angeles LA7
17.55 miles Cogent: 16680 Valley View

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47MW
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