CoreSite has secured a new GPU cloud provider as a customer in Chicago, Illinois.

The American Tower company this week announced an expansion of its relationship with managed services provider STN.

STN has selected CoreSite’s CH2 Chicago data center to host GPU One, the company’s graphical processing unit (GPU) cloud platform. Launching in April 2025, the GPU One cluster comprises more than 1,500 liquid-cooled Nvidia B200 GPUs in SuperMicro servers across 24 racks.

“CoreSite has been a trusted partner throughout STN’s growth journey. When it came time to scale GPU One, our private cloud service for AI builders, we turned to CoreSite for their leadership in liquid-cooled, high-density deployments,” said Sabur Mian, STN CEO. “CoreSite is a leader in liquid cooling in the colocation data center space, and its ability to deliver a customer’s primary liquid cooling solution at CH2 for us is what sealed the deal. STN’s suite of managed IT services allows our customers to focus on their core competencies – model training, fine-tuning, inference, and high-throughput AI pipelines – while STN and CoreSite ensure uptime.”

STN first started working with CoreSite in 2019, starting with a single rack at CoreSite’s SV7 facility in Santa Clara. It has since expanded to LA1 in Los Angeles and now CH2 in Chicago.

CoreSite said it is supporting more than 100kW per rack with liquid cooling for STN. More than 90 percent of customers in the multi-tenant computer room in which STN resides at CH2 are liquid-cooled.

Operating 30 facilities across 11 US markets, CoreSite's estate comprises approximately 4.5 million sq ft (418,000 sqm). American Tower, a company traditionally focused on owning cell towers, acquired CoreSite for $10.1 billion in November 2021. Stonepeak subsequently acquired a 29 percent stake in CoreSite for $2.5 billion the following year.

CoreSite broke ground on the 18MW, 169,000 sq ft (15,000 sqm) CH2 in 2019. Located at 1432 S. Clinton Street, the facility launched the following year.

STN said the cluster is partly supporting robotics startup Skild Brain.