AT1 is CoreSite's 62,000-plus square feet inside 55 Marietta Street, the 21-story building that has served as Atlanta's principal carrier hotel for decades and which CoreSite occupies as a tenant rather than an owner. CoreSite operates one of the building's two meet-me rooms, and 70 networks across four exchanges are reachable on-net from its suites - a density it did not build but can sell access to, with 22 carriers present in the building overall. Within its own space CoreSite offers N and 2N options on UPS, PDU and RPP, N generators, and N+1 mechanical redundancy through variable-speed CRACs, pumps, heat rejection units and cooling towers. Cloud on-ramps reach AWS, Azure, Google Cloud, Oracle and IBM. The building changed hands in December 2025, when RadiusDC acquired it and began adding 8 MW of site capacity.
Facility Specifications
Site information
Colocation space
62,000+ sq ft of CoreSite space within a 403,000 sq ft, 21-story building
Uptime SLA
100% uptime SLA
Power & cooling
Redundancy
N generators; N and 2N options across UPS, PDU and RPP; N+1 mechanical, pumps, heat rejection units and cooling towers
Cooling
Variable-speed CRACs with humidification control; N+1 pumps, heat rejection units and cooling towers
Compliance
SOC 1 Type 2SOC 2 Type 2ISO 27001NIST 800-53PCI DSSHIPAA
Platforms & amenities
Platforms & services
Cabinets, cages and private suites; Open Cloud Exchange and CoreSite Interconnect Gateway; 24x7x365 remote hands
Amenities
WiFi; secure parking; kitchen and TVs. Key card and biometric access, perimeter and interior IP-DVR, 24x7x365 security staff.
GiGstreem (AS14277)GREYSTONE POWER CORPORATION (AS54813)GTHost (AS63023)GTT Communications (AS3257)Host Color (AS46873)Host Leasing (AS15280)Hotwire Communications (AS23089)Hurricane Electric (AS6939)IQ-FIBER (AS400427)IXP FARM (AS33000)JMF Networks (AS40805)Lagless.GG (AS400556)LATIGO (AS19684)LightCore a CenturyTel Co. (AS22561)Macarne - AS64289 (AS64289)Massive Networks (AS21777)MDU Solutions, LLC (AS398064)Momentum Telecom AS25645 (AS25645)Nodes Direct Holdings (AS19531)NOLA Broadband, Inc (AS22462)PacketCove (AS400189)PacketFabric service network (AS4556)Planters Rural Telephone Cooperative (AS26744)PR-IX Route Server (AS18804)QuadraNet (AS8100)RACK911 (AS62710)RamNode (AS3842)ROLL-TIDE (AS401731)Safelink Internet [AS33037] (AS33037)SEIMITSU (AS62844)Shift Hosting (AS394177)Southern Crossroads (SoX) (AS10490)Southern Fibernet (AS393670)Sunbreak Electronics (AS395502)THE GENTRY FUND (AS398448)Uniti Fiber (AS13760)Uniti Kinetic (AS7029)West Carolina Communications (AS10279)Whitesky Communications AS62887 (AS62887)Zayo (AS6461)Zentro (AS17210)
Cloud on-ramps
AWSAzureGoogleOracleIBM
70 networks and 4 exchanges on-net, with 22 carriers present in the building. CoreSite operates one of the building's two meet-me rooms. AWS Direct Connect, Azure ExpressRoute, Google Cloud Interconnect, Oracle Cloud Infrastructure and IBM Cloud via Open Cloud Exchange; Any2Exchange peering.
Request a Quote
Quote request for: CoreSite Atlanta (AT1) view facility
Location
Interactive map
Frequently asked questions
Where is CoreSite Atlanta (AT1) located?
CoreSite Atlanta (AT1) is a colocation data center located at 55 Marietta Street NW, Atlanta, GA, US.
How much space and power does CoreSite Atlanta (AT1) offer?
CoreSite Atlanta (AT1) offers 62,000+ sq ft of CoreSite space within a 403,000 sq ft, 21-story building.
How many carriers are on-net at CoreSite Atlanta (AT1)?
CoreSite Atlanta (AT1) is connected to 71 networks, including 365 Data Centers (BroadbandONE) (AS19151), Accelecom-31877 (AS31877), AISG / Equinox Communications (AS15008), Alabama Fiber Network (AS40463), AlphaCore (AS393446).
What compliance certifications does CoreSite Atlanta (AT1) support?
CoreSite Atlanta (AT1) supports SOC 1 Type 2, SOC 2 Type 2, ISO 27001, NIST 800-53, PCI DSS, HIPAA.
How do I get a quote for colocation at CoreSite Atlanta (AT1)?
Use the Request a Quote form on this page — enter your rack space and power needs and you'll typically receive pricing within 1–2 business days.