Founded in 2001 and headquartered in Denver, Colorado, CoreSite (acquired by American Tower in 2022) is one of the largest data center and cloud infrastructure colocation providers in the United States with 24 data centers across 8 major US markets. CoreSite delivers colocation, cloud connectivity, interconnection, and managed hosting services to 1400+ customers including cloud providers, network operators, enterprises, and government agencies. Their data centers provide direct connectivity to major cloud platforms via private on-ramps to AWS, Azure, Google Cloud, and Oracle Cloud. Located in Chicago, Los Angeles, New York, Northern Virginia, Denver, Boston, San Jose, and Miami, CoreSite serves as critical cloud exchange infrastructure.