CoreSite DE3 data center campus in Elyria-Swansea
Also called: CoreSite DE3, CoreSite Denver campus
CoreSite is building a three-building data center campus on 15 acres in Denver's Elyria-Swansea neighborhood. At full size it could use 65 to 75 megawatts and up to 805,000 gallons of water a day at peak. Neighbors have raised water and noise concerns.
Where things stand: First building nearly done in 2026; two more phases planned on the 15-acre site. Denver's moratorium does not stop permitted work.
🕒 Latest update (Oct 6, 2025): CoreSite said the first building, DE3 (180,000 sq ft), reached a key construction step and should open in 2026.
What we know
- 📍 Where4900 Race Street, near the National Western Center, Denver, Denver County
- 🏢 CompanyCoreSite
- 🌳 Size15 acres
- ⚡ Power it needs75 megawatts (about as much as 60,000 homes)
- 💧 Water805,000 gallons a day
- ❄️ Coolingevaporative cooling
- 💸 Tax breaksCoreSite dropped its request for a city deal worth up to $9 million in 2024.
❓ Still unanswered
Nobody has answered these in public yet. Can you help find out?
- When will CoreSite build the second and third buildings? 🙋 I'll find out
- How much water will the first building use on a normal day? 🙋 I'll find out
What happened so far
- Oct 2024CoreSite dropped its request for a city sales-tax rebate after council members raised water and power concerns.
- Oct 6, 2025CoreSite said the first building, DE3 (180,000 sq ft), reached a key construction step and should open in 2026.
Local votes and rules
📌 Other
Denver named a 26-person working group of residents and experts to recommend data center rules during the moratorium. Meetings start Oct. 9, 2026 and will be streamed. The pause could be extended past May 2027.
⏸️ Pause on new data centers
Denver City Council voted unanimously for a one-year pause on permits and site plans for new data centers. It took effect May 21, 2026. Data centers already running or already permitted (like CoreSite's DE3) can keep going, but CoreSite's two later buildings are on hold.
An aerial photo of the area.
Where this comes from
- CoreSite achieves key construction milestone for new DE3 data center in Denver · CoreSite · Oct 6, 2025
- Denver data center won't pursue tax breaks amid concern (Denver Post) · GovTech / The Denver Post · Oct 31, 2024
- QTS Aurora data center plans 98 more diesel generators · Colorado Public Radio · July 8, 2026
- Local governments in Colorado enact moratoriums on data center development · KUNC / Colorado Newsline · Aug 10, 2026
- To build or to ban: Colorado municipalities grapple with data centers · Colorado Politics / Denver Gazette · Sept 12, 2026
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