CoreSite
U.S. carrier-neutral data center and interconnection services provider.
Last updated August 26, 2026
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Overview
CoreSite is a United States-based provider of carrier-neutral data centers, colocation, network interconnection, cloud connectivity, and peering services. The company serves enterprises, telecommunications carriers, internet service providers, cloud platforms, content and digital media businesses, and other organizations that require secure, highly connected physical infrastructure for information technology operations. Rather than operating primarily as a conventional office or real-estate brand, CoreSite positions its facilities as network-dense environments where customers can place servers and networking equipment and connect directly with multiple carriers, cloud providers, internet exchanges, and business partners. The business began in 2001 as CRG West, initially operating at two important West Coast carrier hotels: Market Post Tower in San Francisco and One Wilshire in Los Angeles. These sites provided an early foundation for the company’s emphasis on carrier neutrality and interconnection. CoreSite expanded beyond California during the 2000s, opening a Washington, D.C., facility in 2005 and acquiring properties in Boston and Chicago in 2007. The company also acquired land in Santa Clara for development of a planned 50-megawatt data center campus, reflecting a move toward larger, purpose-built facilities in addition to carrier hotels. In June 2009, CRG West adopted the CoreSite name. The rebranding accompanied a broader effort to present the company as a national data center and connectivity platform rather than a collection of regional facilities. CoreSite became a publicly traded company through an initial public offering in September 2010. It continued expanding through acquisitions and development, including the 2012 acquisition of Comfluent, which established a stronger presence in Denver. In the same year, CoreSite became the first data center operator in North America enabled for AMS-IX, the Amsterdam Internet Exchange, supporting the company’s focus on internet peering and international network connectivity. CoreSite’s service model combines physical colocation with digital interconnection. Customers can lease data center space, cabinets, cages, suites, and related infrastructure, while using cross-connects and meet-me rooms to connect to carriers, internet exchanges, cloud services, and other tenants. Its cloud connectivity offerings are intended to provide private or direct access to major cloud environments, reducing reliance on the public internet for workloads that require predictable performance, security, or low latency. The company also provides connectivity and support services for network operators and digital infrastructure customers. The company’s geographic strategy centers on major U.S. connectivity markets, including the Boston, Chicago, Denver, Los Angeles, Miami, New York City, Northern Virginia, San Francisco and San Jose, Santa Clara, Atlanta, Orlando, and Washington, D.C., areas. According to the referenced 2022 company information, CoreSite owned 27 operating data center facilities across 10 markets, representing more than 4.6 million net rentable square feet and serving more than 1,350 customers. These figures describe the scale of the business after it had become part of American Tower. CoreSite’s chief executive Tom Ray retired in 2016 and was succeeded by Paul Szurek, previously the company’s lead independent director. In August 2016, the company announced a $60 million acquisition of the 22-acre Sunrise Technology Park from Brookfield Office Properties. In December 2021, American Tower acquired CoreSite, ending its status as an independent public company and integrating the business into American Tower’s broader digital infrastructure portfolio. CoreSite remains an active operating brand focused on U.S. data centers, colocation, cloud on-ramps, carrier access, and interconnection.
History
CoreSite was founded in 2001 under the name CRG West. Its original operations were based at Market Post Tower in San Francisco and One Wilshire in Los Angeles, two established West Coast carrier hotels. These buildings gave the company an early position in locations where telecommunications carriers, internet service providers, and network-intensive businesses colocated equipment and exchanged traffic. The company expanded into the Washington, D.C., market in August 2005. In May 2007, it acquired properties in Boston and Chicago and purchased land in Santa Clara, California, with plans for a 50-megawatt data center campus known as Coronado. This expansion broadened the business from a primarily West Coast carrier-hotel operator into a multi-market U.S. data center platform. In June 2009, CRG West changed its name to CoreSite. The new identity reflected the company’s broader service proposition, which combined data center space with carrier access, interconnection, cloud connectivity, and peering. CoreSite became a public company through an initial public offering in September 2010. CoreSite continued its geographic and network expansion in the following years. In April 2012, it acquired Comfluent and entered the Denver market. In August 2012, it became the first data center operator in North America enabled for AMS-IX, a significant internet exchange platform. The move strengthened CoreSite’s role in internet peering and gave customers access to a wider set of network interconnection options. Leadership changed in July 2016, when chief executive Tom Ray retired. Paul Szurek, who had served as the company’s lead independent director, replaced him as chief executive. The following month, CoreSite announced a $60 million acquisition of the 22-acre Sunrise Technology Park from Brookfield Office Properties. The transaction provided additional land and development potential for the company’s data center strategy. By June 2022, after its acquisition by American Tower, CoreSite reported 27 operating facilities across 10 U.S. markets, with more than 4.6 million net rentable square feet and more than 1,350 customers. The stated markets included Boston, Chicago, Denver, Los Angeles, Miami, New York City, Northern Virginia, the San Francisco and San Jose area, Santa Clara, Atlanta, Orlando, and the Washington, D.C., area. Its customer base included enterprises, network operators, cloud providers, and supporting service providers. In December 2021, American Tower acquired CoreSite. The transaction ended CoreSite’s period as an independent publicly traded company and made it a subsidiary within American Tower’s broader digital infrastructure operations. The CoreSite brand continues to represent American Tower’s U.S. data center, colocation, cloud access, and interconnection services.
- 2022
Reported operating scale
[1]CoreSite is reported to operate 27 facilities in 10 markets, with more than 4.6 million net rentable square feet and more than 1,350 customers.
- 2021
Acquisition by American Tower
[1]American Tower acquires CoreSite and incorporates it into its digital infrastructure portfolio.
- 2016
Chief executive succession
[1]Tom Ray retires as CEO and Paul Szurek succeeds him.
- 2016
Sunrise Technology Park acquisition
[1]CoreSite announces the acquisition of the 22-acre Sunrise Technology Park from Brookfield Office Properties.
- 2012
Comfluent acquisition and Denver entry
[1]CoreSite acquires Comfluent and enters the Denver data center market.
- 2012
AMS-IX enablement
[1]CoreSite becomes the first North American data center operator enabled for AMS-IX.
- 2010
Initial public offering
[1]CoreSite becomes a publicly traded company.
- 2009
Rebranding as CoreSite
[1]CRG West adopts the CoreSite name.
- 2007
Boston and Chicago expansion
[1]The company acquires properties in Boston and Chicago and buys Santa Clara land for a planned 50-megawatt campus.
- 2005
Expansion into Washington, D.C.
[1]CoreSite opens a facility in the Washington, D.C., market.
Products and positioning
A carrier-neutral, network-dense data center platform for enterprises, cloud providers, carriers, internet service providers, and digital infrastructure customers. CoreSite emphasizes interconnection breadth, direct cloud access, low-latency connectivity, and presence in major U.S. network markets.
Data center services
Colocation
CoreSite provides space for customers to install and operate servers, storage, and networking equipment in professionally managed data centers. Offerings can include cabinets, cages, suites, and larger dedicated areas. The facilities are designed for organizations that need resilient power, cooling, physical security, carrier access, and the ability to connect with other tenants and service providers.
Network services
Interconnection and cross-connects
Interconnection services allow customers in CoreSite facilities to establish direct links with telecommunications carriers, internet service providers, cloud platforms, content companies, and business partners. Cross-connects and meet-me-room infrastructure support private exchange of traffic within the data center and are central to CoreSite’s carrier-neutral operating model.
Cloud access
Cloud connectivity
CoreSite offers direct or private connectivity options to cloud environments, enabling customers to access cloud workloads from colocation facilities without relying solely on ordinary public-internet routes. The service is aimed at enterprises and network-intensive customers seeking more predictable performance, lower latency, and controlled connectivity between colocated infrastructure and cloud resources.
Internet infrastructure · 2012
Peering and internet exchange access
CoreSite supports internet peering and exchange connectivity through its network-dense facilities. In 2012, it became the first data center operator in North America enabled for AMS-IX. Such services allow eligible networks to exchange traffic more directly and can improve routing efficiency, latency, and resilience.
Brand decisions
2021
Acquisition by American TowerM&ABackground
CoreSite was an established U.S. data center and interconnection operator with a multi-market facility portfolio.
Action taken
American Tower acquired CoreSite.
Aftermath
CoreSite ceased to operate as an independent public company and became part of American Tower’s digital infrastructure business.
2016
CEO successionOtherBackground
Tom Ray retired after serving as CoreSite’s chief executive.
Action taken
Paul Szurek, previously the lead independent director, became chief executive.
Aftermath
The leadership transition took place while CoreSite continued expanding its data center real-estate and interconnection platform.
2016
Sunrise Technology Park acquisitionM&ABackground
CoreSite sought additional land and development capacity for data center expansion.
Action taken
The company announced the $60 million acquisition of the 22-acre Sunrise Technology Park from Brookfield Office Properties.
Aftermath
The acquisition added a sizeable development site to CoreSite’s infrastructure portfolio.
Acquisition price. $60 million (2016)
2012
Acquisition of ComfluentM&ABackground
CoreSite sought to extend its U.S. geographic footprint and enter the Denver market.
Action taken
CoreSite acquired Comfluent and used the transaction to establish a Denver presence.
Aftermath
Denver became one of CoreSite’s U.S. operating markets.
2012
AMS-IX enablementProduct launchBackground
CoreSite was expanding its network interconnection and internet peering proposition.
Action taken
The company enabled its data center platform for AMS-IX connectivity.
Aftermath
CoreSite strengthened its positioning as a network-neutral interconnection provider and became the first North American data center operator described as AMS-IX enabled.
2009
Rebrand from CRG West to CoreSiteStrategyBackground
The company had expanded from two West Coast carrier hotels into additional U.S. markets and was developing a broader data center and interconnection platform.
Action taken
CRG West changed its corporate and operating brand name to CoreSite.
Aftermath
The CoreSite identity became associated with the company’s national carrier-neutral data center and interconnection business.
Recent events
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