CoreSite's Chicago AI-Optimized Infrastructure Powers STN's GPU One Platform and Helps Deliver Significant Savings

Managed IT Service Provider Taps CoreSite's CH2 NVIDIA-Certified Facility to Support GPU Cloud Service Clients and Benefit from Generous Illinois Tax Incentives

CoreSite, an American Tower company (NYSE:AMT) empowering critical business and AI workloads that impact everyday life through interconnected data center solutions, today announced an expansion of its relationship with STN, Inc., a provider of managed infrastructure and private cloud solutions. STN selected CoreSite's CH2 Chicago data center to host GPU One, the company's fully managed, private graphical processing unit (GPU) cloud platform engineered for enterprise AI workloads and high-performance model development.

Owned and operated by STN within CoreSite's CH2 data center, the GPU One cluster comprises more than 1,500 NVIDIA B200 GPUs, purpose-built for compute-intensive AI training and inference workloads. Designed as a turnkey managed service, GPU One delivers the reliability, performance and compliance required for enterprise-scale AI operations. The customer's primary liquid cooling solution for this deployment includes dual pumps, thermal storage, 415V 100A power whips and real-time system monitoring— maximizing chip longevity and ensuring consistent performance across demanding workloads.

STN chose the CH2 facility for GPU One to leverage CoreSite's industry-leading interconnection capabilities, enabling low-latency access to public clouds and AI ecosystems. CoreSite's Chicago data center campus offers direct cloud connectivity to AWS, Microsoft Azure, Google Cloud and Oracle Cloud, along with access to the Open Cloud Exchange^® that provides customers another solution to simplify interconnection among CoreSite data centers, clouds and digital ecosystems. Customers can also leverage the Any2Exchange^® for internet peering and have access to more than 65 networks.

"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, Chief Executive Officer and Co-Founder of STN, Inc. "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 was also able to participate in the Illinois Department of Commerce and Economic Opportunity Retail Sales Tax Exemption program, available to CoreSite's CH2 customers and applies to all IT equipment and software deployed by eligible customers at the data center. This program provided substantial savings to STN on the IT equipment and software needed to support GPU One, further demonstrating the economic advantages of CoreSite's CH2 data center.

"Chicago is an important data center market that offers attractive tax incentives for increasingly complex customer use cases that require state-of-the-art colocation," said Yvonne Ng, Vice President and General Manager, Central Region at CoreSite. "CH2 is a purpose-built data center with the power, cooling, interconnection and financial incentives needed to host scalable, high-performance infrastructure, so companies like STN can capitalize on the rising demand for AI and machine learning."

CoreSite is supporting more than 100 kilowatts per cabinet with the liquid cooling solution for STN. Since the STN expansion with CoreSite launched in April 2025, more than 90% of customers in the multi-tenant computer room in which STN resides are liquid-cooled.

STN, Inc. first began working with CoreSite in 2019, starting with a single rack at CoreSite's SV7 facility in Santa Clara. The collaboration has since grown to include LA1 in Los Angeles and now CH2 in Chicago, reflecting the expansion of GPU One and STN's continued investment in high-performance, enterprise-grade AI infrastructure.

To learn more about the STN deployment, read the recent blog.

About CoreSite

CoreSite, an American Tower company (NYSE:AMT), is a leading interconnection data center platform that empowers businesses to future-proof their digital transformation initiatives. For more than 20 years, CoreSite's purpose-built, highly interconnected data center campuses and team of experts have delivered the cloud-enabled, resilient and flexible digital ecosystems required for customers to quickly scale and interoperate their businesses to support the increasing demands of critical workloads, like AI and high-density applications. For more information, visit CoreSite.com and follow CoreSite on our Connect[ED] blog, LinkedIn and YouTube channels.

About STN

STN is a next-generation infrastructure partner specializing in GPUaaS, managed services, and secure AI platforms for companies building the future. From high-growth AI startups to enterprise innovation teams, STN helps customers navigate complexity with expert consulting, vendor-agnostic strategy, and purpose-built infrastructure that's ready for production at scale. Learn more: www.stninc.com.

Forward-Looking Statements

This press release contains statements about future events and expectations, or "forward-looking statements," all of which are inherently uncertain. We have based those forward-looking statements on management's current expectations and assumptions and not on historical facts. These forward-looking statements involve a number of risks and uncertainties. For important factors that may cause actual results to differ materially from those indicated in our forward-looking statements, we refer you to the information set forth under the caption "Risk Factors" in Item 1A of American Tower's most recent annual report on Form 10-K, and other risks described in documents American Tower subsequently files from time to time with the Securities and Exchange Commission. Neither we nor American Tower undertake any obligation to update the information contained in this press release to reflect subsequently occurring events or circumstances.

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