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
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- Solar46.8%
- Natural Gas28.7%
- Wind9.2%
- Hydro7.3%
- Nuclear5.3%
- Geothermal1.8%
- Biomass0.9%
Real-time generation mix for the CAISO grid this site draws from, as of Jul 15, 2026, 10:20 PM. ISO-wide, not this facility's own metering. Source: gridstatus.
Grid & water — why here
source: HIFLD · EPAThe closest existing grid infrastructure and the municipal water system this location sits in — the same constraints the buildout model screens on (it won't site a campus more than ~2 km from a substation or ~5 km from municipal water). Distances are straight-line to public HIFLD/EPA features, not a metered connection.
In the news
source: GDELTTax 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.