Project Cardinal — Data Center Campus, Yorkville
Northwest of Route 47 and Galena Road, south of Baseline Road, east of Ashe Road — Yorkville, IL (Kendall County)
Summary
Pioneer Development, LLC is proposing a massive data center campus in Yorkville, Illinois spanning over 1,037 acres across 20 parcels. Dubbed 'Project Cardinal,' the development would include 14 data center buildings totaling over 17 million square feet, along with two electrical substations, a utility switchyard, and stormwater infrastructure — potentially one of the largest data center campuses in the world.
The Yorkville City Council approved an annexation agreement and rezoning from residential/commercial to M-2 General Manufacturing in 2025. In April 2026, residents filed suit alleging the rezoning lacked required environmental studies and proper public notice.
As of June 2026, the developer is seeking an 18-month extension to the annexation deadline (to December 31, 2027), citing delays in acquiring all needed parcels. The city has offered $51 million in economic development incentives contingent on full closing.
Key Facts
Data Center Buildings
14 buildings totaling 17+ million sq ft
Total Site
1,037+ acres across 20 parcels
Construction Timeline
Estimated ~20 years to full build-out
Proximity to Residences
As close as 112 feet from existing homes
City Economic Incentive
$51 million over 4 years (contingent on developer closing all parcels)
Companion Project
"Project Steel" — 540 acres; separate $40 million city agreement
Annexation Deadline
Extension requested to December 31, 2027 (original deadline: July 1, 2026)
* Projected figures from Village of Minooka fact sheet.
Timeline of Events
June 9, 2026
Developer seeks 18-month extension to annexation deadline
Pioneer Development / City of Yorkville
Developer cited 'unforeseen circumstances' delaying land acquisition on certain parcels. Extension would move the annexation agreement deadline from July 1, 2026 to December 31, 2027. If the deadline is missed without an approved extension, the annexation agreement becomes null and void.
April 2026
Lawsuit filed by residents against city and developer
Preserve Our Yorkville & Community LLC (plaintiffs include Chuck Kasper and Dorothy Flisk)
Plaintiffs allege the city rezoned 1,000+ acres from residential to industrial without conducting required environmental studies — including noise analysis, traffic impact study, and water consumption analysis — and failed to provide proper public notice to property owners within 500 feet of the site. Dorothy Flisk owns Legacy River Equestrian Center, which sits as close as 112 feet from the proposed development.
Through February 2026
Application packages updated through multiple submittals
Pioneer Development
Case PZC 2025-08 updated with revised application packages through at least February 2026.
July 9, 2025
Planning & Zoning Commission hearing on rezoning and PUD
Yorkville Planning & Zoning Commission
Hearing on the proposed rezoning from R-1, R-2, R-3, and B-3 districts to M-2 General Manufacturing District and Planned Unit Development. Deviations requested for yard setbacks, energy standards, parking, landscaping, mechanical screening, fencing, and street circulation.
June 10, 2025
City Council public hearing on annexation agreement
United City of Yorkville City Council
Public hearing on the annexation agreement covering 305 acres of farmland (seven parcels) out of the 1,037-acre total site.
Incentive Agreements
$51 million city payment to developer over four years, contingent on developer closing on all parcels
Approved by: City of Yorkville
$40 million city agreement tied to 'Project Steel,' a separate 540-acre data center development approved alongside Project Cardinal
Approved by: City of Yorkville
Documents Library
| Document | Type | Date | Source | Link |
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Resources & Coverage
Pioneer Development seeks an 18-month extension to the annexation agreement deadline (to December 31, 2027), citing delays in land acquisition. Reports $51 million city incentive contingent on full closing, and notes Yorkville approved 3 data center projects from approximately a dozen proposals spanning 3,000 acres.
Residents including Dorothy Flisk (Legacy River Equestrian Center, 112 feet from the site) filed suit against the City of Yorkville and Pioneer Development, alleging the rezoning of 1,000+ acres lacked required environmental studies and proper public notice. The project was described as potentially the largest data center campus in the world outside China.
Official city page for Project Cardinal (Case PZC 2025-08). Includes application packages, hearing notices, and details on requested zoning deviations for the 1,037-acre, 14-building campus proposed by Pioneer Development.