CoreSite Real Estate 55 S. Market Street
55 Market Street · San Jose, Santa Clara County, CA
Source: Primary source
CoreSite Real Estate 55 S. Market Street is a mapped data center in Santa Clara County, CA, operated by CoreSite, LLC and ultimately owned by American Tower Corporation. DataCentersExposed has documented 78 MW of reported power capacity at this site.
Reporting by Eric Keller · Updated Jun 13, 2026
Most sites are mapped — located but awaiting a second source. How we verify
Dot size = disclosed capacity (MW). Smallest = undisclosed, not small.
Overview
source: linkEIA Plant 61474 (CoreSite Real Estate 55 S. Market Street, LLC). Generation tech: Petroleum Liquids. Reported capacity: 78.0 MW
Operator chain
- Ultimate parentAmerican Tower Corporation
- Files asCoreSite, LLC
- This facilityCoreSite Real Estate 55 S. Market Street
The grid behind this site, right now
source: CAISO · gridstatus- Solar53.3%
- Imports14.6%
- Wind10.5%
- Nuclear7.1%
- Hydro6.3%
- Natural Gas4.5%
- Geothermal2.4%
- Biomass1.3%
Real-time generation mix for the CAISO grid this site draws from, as of Jun 16, 2026, 2:45 PM. ISO-wide, not this facility's own metering. Source: gridstatus.
In the news
source: Google News- CoreSite acquires Silicon Valley office property zoned for data center redevelopmentData Center Dynamics· Feb 12, 2026
- Data center developer buys Santa Clara buildings in $100M dealThe Real Deal· Feb 10, 2026
- Data center firm buys three South Bay tech buildings for $100 millionThe Mercury News· Feb 9, 2026
- Big Fiber bypasses 'tapped out' Bay Area networks with dark fiber expansionSDxCentral· Jan 20, 2026
- BIG Fiber completes San Jose dark fibre ring with CoreSite SV1 connectionfibre-systems.com· Jan 19, 2026
- How CoreSite Drives Cloud Connectivity and AI InfrastructureData Centre Magazine· Oct 24, 2025
Tax breaks & subsidies
source: Good Jobs First / GASB 77No per-deal tax break is linked to this site yet. No state discloses the recipient of a data-center abatement at the facility level, so per-site deals are rare in the public record. If you have a development agreement or board resolution for this site, send it to us.
Water use
No measured record exists, so this is a low-confidence model from 78 MW (disclosed IT power): 2 L/kWh cooling (hot climate) + 0.45 gal/kWh embedded in US grid average. How we estimate. Have a utility document? Send it and we'll replace this with the real figure.
EPA permits & violations
source: EPA ECHONo reported violations as of last sync.
Air quality near this site
source: AirNowAir Quality Index from the nearest AirNow reporting area (San Jose), as of 2026-06-10. Regional context — not this facility's own emissions.
Who lives nearby
source: Census ACS 2023Demographics of the census tract this facility sits in (American Community Survey 5-year estimates). Environmental-justice context for who bears the local impacts.
Nearest school
source: HIFLD / NCESThe nearest public school, Horace Mann Elementary in San Jose, is 0.5 mi from this site (300 students). 5 public schools sit within a mile of the site.
Schools are sensitive receptors for the noise, backup-generator exhaust, and traffic a large data center brings. Straight-line distance to the nearest public school (HIFLD/NCES, US public schools only).
Hearings timeline
No public-hearing records linked to this site yet. We surface planning-commission and board-of-supervisors dates when a record names a facility. If you know of a hearing on this site, tell us.