From orbit
The site from above
1From orbit
Cornerstone southern development area
Satellite views of the same ground on June 22, 2023 and March 14, 2025. Drag to compare.
Power
Power and the grid
None energized or contracted yet
ComEd grid serviceSecured (stated), terms not on record
1.55 GW 'secured' per the developer (press, Oct. 2025); the Village says supply agreements are in place (Aug. 2026); dates and terms are not on record; the developer funds the on-campus substation Local government · Aug. 2026
Proposed
Backup generators (emergency use, not a power supply)
- Diesel backup generators Not yet permittedbackup only, no on-site prime power; the lawsuit alleges 1,500 to 2,000 MW of aggregate backup (allegation); no air permit found Court filing · July 2026
Getting on the grid
Who supplies what, what it costs, and what is still not public.
- Feb. 2025ComEd service plannedEarly company materials cite about 1,600 MW of utility power for the campus. News report · Feb. 2025
- Aug. 18, 2026Supply agreements confirmedThe Village confirms ComEd electric supply agreements are in place, with the developer paying for all supply infrastructure and its own substation. Local government · Aug. 2026
- Aug. 18, 2026Separate rate classComEd serves the campus under a separate rate class for high energy users, per the Village. Local government · Aug. 2026
- Not setMinimum take and collateral: not publishedMinimum-take, term and collateral terms are not public, and it is not known whether T5 signed ComEd's large-load security agreement. News report · Oct. 2026
- ComEd's framework asks large-load customers of 50 MW or more for a letter of credit covering 10 years of transmission revenue (press). News report · Oct. 2026
Permits
Permits checklist
1 withdrawn · 3 granted · 1 checked, nothing on file
- ↩Wetlands fill, about 16 acres WithdrawnFederal, state or county (not named by the Village) · July 31, 2026: halted after the Village urged a change of course; reportedly withdrawn July 31, 2026 Local government · Aug. 2026
- ✓Planned unit development, special use and plats GrantedVillage of Grayslake Village Board · May 6, 2025: final approval after six plan meetings and five hearings; the Plan Commission had only recommended the amendment in Sept. 2024 Court filing · July 2026
- ✓Foundation, site and building permit, first building GrantedVillage of Grayslake · Sept. 1, 2026: 800,000 sq ft first building; construction began while the lawsuit is pending News report · Sept. 2026
- ✓State data center tax certification GrantedIllinois DCEO · 2025: $250M commitment, about $15.6M tax benefit; the Governor paused the program for new projects July 1, 2026, which does not revoke this one State agency · 2025
- –Checked, nothing on file: Air permit for diesel backup generators
Risks
What could slow it down
- HighLawsuit to void the approvalsResidents argue the zoning does not expressly allow data centers and that open-meetings rules were broken. The Village has moved to dismiss; the case is pending. see Lawsuits
- HighNo tenantThe campus is speculative: no tenant is announced, and only Phase 1 is in motion. State agency · Oct. 2026
- MediumPolitical and local oppositionA county-wide opposition coalition, nearby villages and a 55+ community oppose the campus; Lake County adopted a moratorium in Sept. 2026, but it covers only unincorporated land and not this site. News report · Sept. 2026
- MediumBackup generators unpermittedNo air permit for diesel backup generators was found, and the lawsuit alleges 1,500 to 2,000 MW of aggregate backup capacity (allegation). see Permits
- WatchUtility terms and state incentiveComEd contract terms are not public, and the state tax program has been closed to new projects since July 2026. State agency · July 2026
Lawsuits
1 case on record
- Filed July 31, 2026; Village motion to dismiss pending Preservation of Community Well-being Collective LLC et al. v. Village of Grayslake, T5 Data Centers and Alter Asset ManagementLake County Circuit Court, Chancery (Case 2026CH00000171) Court filing · July 2026seeks to void the 2024 to 2025 approvals and development agreements and to block further permits; first status hearing set for Oct. 30, 2026 (press)
Money
Money on record
$1.4B
property tax over 20 years
preliminary Village estimate; paid in full from day one Local government · Aug. 2026
$29.4M
Land purchase, recorded May 2024
Lake County Land Holdings LLC to T5 Chicago IV LP (county deed records) County deed records · May 2024
$19.7M
Land purchase, recorded July 2025
Lake County Land Holdings LLC to T5 Chicago IV LP (county deed records) County deed records · July 2025
$17.0M
Land purchase, recorded Jan. 2025
BHB Investments LLC to T5 Chicago IV LP (county deed records) County deed records · Jan. 2025
Not on record: Village incentives: no abatement, exemption or TIF Local government · Aug. 2026
Land assembly
4 recorded land documents for the campus company in county records (May 2024 to July 2025); 4 list a price. 2 sales or conveyances by the campus company or to public bodies are not listed. Parcel counts come from the deed; acreage is not recorded.
- May 2024 Lake County Land Holdings LLC to T5 Chicago IV LP · $29.4M · 4 parcels County deed records · May 2024
- Jan. 2025 BHB Investments LLC to T5 Chicago IV LP · $17M · 5 parcels County deed records · Jan. 2025
- May 2025 199 Cornerstone Parkway LLC to T5 Chicago IV LP · $5.6M · 19 parcels County deed records · May 2025
- July 2025 Lake County Land Holdings LLC to T5 Chicago IV LP · $19.7M · 2 parcels County deed records · July 2025
Timeline
What happened, and what is due
SitePaper trailConstructionPowerPermitsMoneyLegalUpcoming
- May 7, 2024Money Land purchase recorded at $29.4M: Lake County Land Holdings LLC to T5 Chicago IV LP (4 parcels) County deed records · May 2024
- May 2024Site T5 announces the Grayslake campus (Chicago IV). News report · May 2024
- Sept. 9, 2024Permits Plan Commission recommends the Alter Group's change to the business park plan (a recommendation, not a decision). Court filing · July 2026
- Sept. 23, 2024Permits First public hearings on the data center campus. Local government · Aug. 2026
- Feb. 20, 2025Money QuadReal adds $8B of equity to T5's platform. Company · Feb. 2025
- May 6, 2025Permits Village Board gives final approval for up to 472 acres and 10.1M sq ft. Court filing · July 2026
- May 12, 2025Site Land purchases from the Alter entities bring about 225 acres under T5's control (press). News report · May 2025
- June 13, 2026Site First public protest; opposition groups form across Lake County. News report · June 2026
- July 1, 2026Permits Illinois pauses its data center tax program for new projects; T5's 2025 certification stays. State agency · July 2026
- July 31, 2026Site Residents sue the Village, T5 and the Alter Group to void the approvals; the developer is reported to have halted its wetlands application (press). Court filing · July 2026
- Sept. 1, 2026Permits Village issues the building permit for the first 800,000 sq ft building (press). News report · Sept. 2026
- Oct. 30, 2026Site First status hearing in the lawsuit (press). News report
- End of 2027Power Phase 1 (three buildings) delivery target, Q4 2027 (company, press). News report · Feb. 2025
Construction activity
Building activity by quarter
Since Jan. 2022: 3 FAA filings (June 2026 to Aug. 2026): tallest permanent building 150 ft (filed July 2026) and tallest crane 185 ft (June 2026); 23 satellite captures.
FAA filings
Satellite
’22
’23
’24
’25
’26
Dot size: records in the quarter, largest = 2. Two-digit years mark each first quarter.
The buildings
Specs
10.1M sq ft
of data center buildings the approvals allow; the Village's plan shows 6.75M sq ft in 11 buildings
473 acres
campus site per the Village; 134 acres bought from the Alter Group with an option on 45 more (press)
50,000 gal/day
campus-wide water use at the 6.75M sq ft plan, closed-loop cooling
1,200 to 1,600
operations jobs the Village estimates, plus 750 to 1,000 construction jobs a year
Who is involved
Owners, partners and builders
Owners and developers
- T5 Data Centers (Atlanta): developer and operator
- T5@Chicago IV, LP: project owner, holds the state certification
- QuadReal Property Group: equity partner, owned by BCI
Landowner
- The Alter Group: Cornerstone park developer and seller of the land
Decision-makers
- Village of Grayslake Village Board: approving authority
- Illinois DCEO: tax certification
- ComEd: utility and substation builder
Opponents
- Preservation of Community Well-being Collective and nine residents: plaintiffs
- Lake County Data Center Opposition Coalition, Saddlebrook Farms residents, and the Villages of Mundelein and Round Lake Park
Still unknown
Open questions
- Any tenant or lease.
- ComEd minimum-take, collateral and term.
- Outcome of the lawsuit and the motion to dismiss.
- Air permit and the real size of the backup generator fleet.
- 1 unconfirmed county land record near the site: the buyer or location could not be tied to this campus.
Where this comes from
274 records from 28 documents
Drawn from news reports, public and commercial datasets, state agency records, local government records, company statements, securities filings, court filings and satellite captures, each kept with its date and source. The bar shows documents by type.
News report 9Dataset 8State agency 5Local government 2Company 2SEC filing 2Court filing 1Satellite 0
Evidence
Every quote behind this page
Grade key: A = the primary record itself (permit, filing, exhibit) · B = a dated official statement · C = news reporting. Map distances are our own measurements on OpenStreetMap and carry no grade. Allegations in lawsuits are marked as such in the quotes.
Power (26)
- Power plan: grid“The supply of electricity will be from the PJM Interconnection... ComEd transmission lines bring power from PJM to customers”Local government · Oct. 2026 · grade B
- Jurisdiction note: site lies inside the Village of Grayslake (municipal zoning under the Cornerstone PUD, MX district), the Village, not Lake County, held land-use jurisdiction; no state preemption displaced the local a“the site is presently zoned MX, which allows for industrial, logistics, warehouse, and other similar uses including data centers (village administrator, via Chronicle Media)”Local government · Oct. 2026 · grade B
- Utility: Commonwealth Edison (ComEd)“electric supply agreements that are already in place between the developer and ComEd”Local government · Aug. 2026 · grade B
- Grid operator: PJM Interconnection“The supply of electricity will be from the PJM Interconnection regional transmission organization”Local government · Aug. 2026 · grade B
- Interconnection status: utility power secured per developer; Village confirms ComEd supply agreements in place“electric supply agreements that are already in place between the developer and ComEd”Local government · Aug. 2026 · grade B
- Electric service agreement signed: yes, electric supply agreements in place with ComEd (execution date not disclosed)“as provided for in electric supply agreements that are already in place between the developer and ComEd”Local government · Aug. 2026 · grade B
- Rate class: separate rate class for high energy users (ComEd, per Village FAQ)“residential customers in Illinois are charged on a separate rate structure than high energy users (like data centers)”Local government · Aug. 2026 · grade B
- Conditions of approval: development agreements include architectural standards; building permits conditional on compliance with federal/state standards (stormwater, sound, lighting, sewer discharges, air emissions, water“Permits will be conditional on compliance with all federal, state, and other agency requirements/standards as well as Village requirements”Local government · Aug. 2026 · grade B
- Utility service: 1,550 MW“anchored by approximately 1.55 gigawatts of total electrical power supply secured from Commonwealth Edison Company”Court filing · July 2026 · grade B
- On-site power technology: diesel backup generators (backup only); no on-site prime generation“The campus will require backup generation capacity in the range of 1.5 to 2 gigawatts of stationary diesel engines”Court filing · July 2026 · grade B
- On-site generation: 1500-2000 (alleged aggregate diesel backup capacity) MW“backup generation capacity in the range of 1.5 to 2 gigawatts of stationary diesel engines”Court filing · July 2026 · grade B
- ILEPI/Project for Middle Class Renewal Illinois data centers report lists T5 @ Chicago IV at 1,200 MW, 450 acres, $12B cost and 1,500 jobs (case-study table), secondary figures that differ from the village's 473 acres /“T5 @ Chicago IV — Yes — 1,200 — 450 — $12,000,000,000 — 1500”Dataset · Oct. 2026 · grade C
- ComEd announced eight large-load customers had signed Transmission Security Agreements covering more than 6.5 GW of forecasted load, each posting a letter of credit for 10 years of transmission service revenues; two more“The TSAs require new large-load power users to provide a letter of credit guaranteeing transmission revenue payments for the first 10 years of their project's operation”News report · Sept. 2026 · grade C
- Utility service: 1,550 MW“Marin said developers have secured 1.55 gigawatts of power from ComEd for the development, 1.2 gigawatts of which will be leasable power.”News report · Oct. 2025 · grade C
- Stated campus size: 1,200 MW“They could build 20 two-story 60-megawatt data centers, Marin said”News report · Oct. 2025 · grade C
- Interconnection status: Power secured from ComEd per sponsor statements as reported (1.55 GW, Oct 2025; 1.6 GW secured utility power in the updated company statement); ComEd-built on-site substation planned; no FERC-file“The campus will also include its own ComEd-built substation.”News report · Oct. 2025 · grade C
- large load interconnection request: power secured from ComEd reported (1.55 GW, of which 1.2 GW leasable); ComEd-built on-site substation planned“Marin said developers have secured 1.55 gigawatts of power from ComEd for the development, 1.2 gigawatts of which will be leasable power.”News report · Oct. 2025 · grade C
- Stated campus size: 1,200 MW“the project has been pitched as 1.2 gigawatts of eventual capacity spread across up to 20 separate buildings”News report · May 2025 · grade C
- IT capacity: 1,200 MW“With up to 1.2GW of IT capacity and 1.6GW of secured utility power, the CHI lV campus will provide the scalable, high-performance infrastructure”News report · Feb. 2025 · grade C
- Utility service: 1,600 MW“With up to 1.2GW of IT capacity and 1.6GW of secured utility power”News report · Feb. 2025 · grade C
- Phases: Phase 1: three buildings, delivery targeted Q4 2027“Phase 1 of the campus will total three 60MW buildings, to be delivered in Q4 2027”News report · Feb. 2025 · grade C
- Buildings: 20 buildings“T5 said the site will support 20 buildings, each offering 60MW, for a total of 1.2GW”News report · Feb. 2025 · grade C
- Substation: ComEd on-site substation (unnamed) plus T5 switchyards“The development will have a 1.6 GW ComEd onsite substation with additional T5 substations (switchyards) throughout the campus”News report · Feb. 2025 · grade C
- Current target date: 2027-Q4“Phase 1 of the campus will total three 60MW buildings, to be delivered in Q4 2027”News report · Feb. 2025 · grade C
- IT capacity: 480 MW“T5 first announced plans for a Grayslake campus in May 2024; at the time the 160-acre site was set to span 480MW”News report · May 2024 · grade C
- Original target date: 2027-Q4“the first building slated to come online in Q4 2027, offering 60MW of IT capacity”News report · May 2024 · grade C
Money and contracts (42)
- Square feet: 10100000 sq ft“authorizing development of a hyperscale data center campus of up to 472 acres and 10,100,000 square feet of buildings”Court filing · July 2026 · grade A
- State incentive MOU (Data Center Investment Program): reported status 2025 assistance amount $1,139,405; 0 jobs created as of Dec. 31, 2025; 20 hires anticipated starting Jan. 1, 2030 at $100,000 average wage USD“Data Center Program — 1,139,405.00 — 25 DAT1525... Operations 1/1/2030 20 $100,000.00 $2,000,000.00”State agency · May 2026 · grade A
- Owner companies: T5@Chicago IV, LP“T5@Chicago IV, LP — 2025 — Grayslake — $250,000,000 — $15,625,000 — 20”State agency · 2025 · grade A
- Incentives: Illinois DCEO Data Center Investment Program certification (2025): $250M capital investment commitment; estimated $15,625,000 sales/use tax benefit; 20 new jobs“T5@Chicago IV, LP — 2025 — Grayslake — $250,000,000 — $15,625,000 — 20”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): scope sales and use tax exemptions for the Grayslake campus; agreement no. 25 DAT1525“Upon approval of the application, the Department enters into a memorandum of understanding (MOU) with the qualified data center”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): investment condition 250000000 USD“Make at least a $250 million capital investment... For new data centers, the capital investment must be made within a 60-month period to be agreed to between the Department and the data center owner/operator”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): jobs condition 20 new full-time jobs at total compensation of at least 120% of the county average wage“The project must result in at least 20 new full-time or full-time equivalent jobs... total compensation equal to or exceeding 120% of the average wage paid to fulltime employees in the county”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): green condition carbon neutral or an approved green building standard within two years of being placed in service“Within two years of the project being placed in service, demonstrate that the data center is carbon neutral or attained one of the following green building standards”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): term exemptions up to 20 years; exemption certificates issued in five-year increments“the data center may receive sales and use tax exemptions for up to 20 years... tax exemption certificates are issued in five-year increments and subject to renewal”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): repayment / clawback MOU sets out repayment obligations if the investment and jobs targets are not achieved (program-level term; the executed T5 MOU itself was not op“The repayment obligations should these targets not be achieved and any conditions under which repayment by the data center or tenant claiming the exemption or credit will be required”State agency · 2025 · grade A
- State incentive MOU (Data Center Investment Program): labor condition owner/operator must require its contractor to enter a project labor agreement approved by DCEO“The data center owner or operator must require its contractor to enter into a project labor agreement approved by the Department”State agency · 2025 · grade A
- Site address: 30907 N Alleghany Rd, Grayslake, IL 60030“The site at 30907 North Alleghany Road has been acquired from the Alter Group for $29.4 million and is already zoned for data center use”Dataset · Oct. 2026 · grade B
- Land purchase: T5 paid $29.4 million for 134 acres from the Alter Group, with an option on another 45 acres (Baxtel/DataCenterMap)“T5 paid $29.4 million for 134 acres and has an option on another 45 acres”Dataset · Oct. 2026 · grade B
- Paper or real: real, land acquired (approx. $60M), state certification granted, building permit issued, construction begun; but no tenant and only Phase 1 is in motion“T5@Chicago IV, LP — 2025 — Grayslake — $250,000,000”State agency · Oct. 2026 · grade B
- Buildings: 11 buildings“Latest plans expect 6,750,000 square feet of building space across 11 different buildings”Local government · Aug. 2026 · grade B
- Square feet: 6750000 sq ft“Latest plans expect 6,750,000 square feet of building space across 11 different buildings. At this point, and subject to change, the total building space is expected to be 33% less than previous plans”Local government · Aug. 2026 · grade B
- Stated capital cost: 18000000000 USD“the data center campus in Grayslake represents an estimated $18 billion in private investment”Local government · Aug. 2026 · grade B
- Incentives: none from the Village of Grayslake, no abatement, exemption or TIF; 100% of property taxes payable from day one“the approved development agreements do not provide for any financial incentives... required the developer to pay 100% of owed property taxes per law from day one of the project, in full, with no tax abatement”Local government · Aug. 2026 · grade B
- Property tax estimate: 1400000000 (first 20 years, preliminary village estimate) USD“of non-homeowner property tax revenues from the approved data center campus to local taxing bodies... is $1.4 billion dollars in the first 20 years”Local government · Aug. 2026 · grade B
- Development agreement(s): conditions Cornerstone development agreements include architectural standards“The Cornerstone project development agreements include architectural standards”Local government · Aug. 2026 · grade B
- Development agreement(s): financial terms no village financial incentives; developer pays 100% of property taxes from day one, no abatement“the approved development agreements do not provide for any financial incentives”Local government · Aug. 2026 · grade B
- Development agreement(s): amendment Village cannot change its approvals unless the developer requests changes“the approved development agreements do not allow the Village to change its approvals unless the developer requests changes”Local government · Aug. 2026 · grade B
- Electric supply agreements: scope developer funds all electricity supply infrastructure to serve the campus, including its own on-campus substation“Under agreements with ComEd, the data center developer will fund the electricity supply infrastructure to serve the data center campus including its own electrical substation on the campus”Local government · Aug. 2026 · grade B
- Electric supply agreements: status agreements already in place (execution date and term not disclosed)“electric supply agreements that are already in place between the developer and ComEd”Local government · Aug. 2026 · grade B
- Acres: 472 acres“development of a hyperscale data center campus of up to 472 acres and 10,100,000 square feet of buildings”Court filing · July 2026 · grade B
- Development agreement(s): scope“the Village and Defendant T5 Data Centers, LLC executed one or more development agreements during or in connection with this approval cycle”Court filing · July 2026 · grade B
- Development agreement(s): phasing requirement that T5 complete a specified minimum number of phases or buildings“the development agreement or agreements include one or more contractual provisions imposing phasing requirements on T5, including without limitation a requirement that T5 complete a specified minimum number of phases or buildings”Court filing · July 2026 · grade B
- Development agreement(s): termination FINDING: no termination or cancellation clause is public. The executed agreement was produced by the Village on June 16, 2026 in the litigation; plaintiffs state specific provisions“The executed development agreement produced by the Village on June 16, 2026 is under continuing review by counsel, and specific contractual provisions will be pleaded with particularity in an amended pleading”Court filing · July 2026 · grade B
- Land purchase (recorded deed): contract value 19676000 USD“Recorded: July 18, 2025 · Price: $19,676,000 · Grantor: LAKE COUNTY LAND HOLDINGS LLC · Grantee: T5 CHICAGO IV LP · Parcel number: 10-03-400-012 · Address: 31121 N ALLEGHANY RD · City: GRAYSLAKE”County deed records · July 2025 · grade B
- Land purchase (recorded deed): contract value 5593000 USD“Recorded: May 5, 2025 · Price: $5,593,000 · Grantor: 199 CORNERSTONE PARKWAY LLC · Grantee: T5 CHICAGO IV LP · Parcel number: 10-11-101-004 · Address: CORNERSTONE PKWY · City: GRAYSLAKE”County deed records · May 2025 · grade B
- Land purchase (recorded deed): contract value 7769500 USD“Recorded: April 30, 2025 · Price: $7,769,500 · Grantor: LAND HOLDINGS LLC · Grantee: T5CHICAGO IV LP · Parcel number: 10-11-101-020 · Address: CORNERSTONE PKWY · City: GRAYSLAKE”County deed records · April 2025 · grade B
- Financing: QuadReal/T5 platform: additional $8B equity investment (Feb 2025) to fund a 5 GW scaled-campus strategy including Grayslake“expanded their Data Center Platform with an additional $8 billion equity investment to help fund T5's strategic growth”Company · Feb. 2025 · grade B
- Joint venture platform: financing scope additional $8B equity investment; platform formed 2019, jointly owned; 5 GW scaled-campus strategy“The Platform, initially formed in 2019 and jointly owned by QuadReal and T5 principals”Company · Feb. 2025 · grade B
- Land purchase (recorded deed): contract value 17000000 USD“Recorded: Jan. 27, 2025 · Price: $17,000,000 · Grantor: BHB INVESTMENTS LLC · Grantee: T5 CHICAGO IV LP · Parcel number: 10-11-100-009 · Address: W PETERSON RD · City: GRAYSLAKE”County deed records · Jan. 2025 · grade B
- Land purchase (recorded deed): contract value 29356500 USD“Recorded: May 7, 2024 · Price: $29,356,500 · Grantor: LAKE COUNTY LAND HOLDINGS LLC · Grantee: T5 CHICAGO IV LP · Parcel number: 10-10-201-002 · Address: 000 ADDRESS EXCEPTION · City: CITY EXCEPTION”County deed records · May 2024 · grade B
- Land purchase (recorded deed): contract value 4284000 USD“Recorded: July 5, 2022 · Price: $4,284,000 · Grantor: LAKE COUNTY LAND HOLDINGS LLC · Grantee: 1999 CORNERSTONE PARKWAY LLC · Parcel number: 10-11-101-001 · Address: CORNERSTONE PKWY · City: GRAYSLAKE”County deed records · July 2022 · grade B
- Tenants: none named; campus marketed to hyperscale and commercial cloud customers“supplying AI and Cloud-ready data center capacity to the world's most sophisticated technology companies”News report · Oct. 2026 · grade C
- Tenant status: speculative, no tenant announced“The campus will be T5's fourth, and largest, project in the Chicago area”News report · Oct. 2026 · grade C
- Stage: under construction (Phase 1) on an entitled, permitted campus; speculative (no tenant); approvals under litigation challenge“Plaintiffs ask this Court to declare the approvals invalid, to enjoin further building permits or site work pursuant to those approvals, to void the development agreements”Court filing · Oct. 2026 · grade C
- Electric supply agreements: terms finding FINDING: minimum-take, term and collateral terms for this campus are not published. ComEd's large-load framework (TSA) requires a letter of credit covering 10 years of transmissi“the customers will have to provide a letter of credit for ten years of transmission service revenues”News report · Oct. 2026 · grade C
- Land price: approx. 60000000 USD“T5 has now spent nearly $60M in the past year acquiring land there for its proposed hyperscale campus”News report · May 2025 · grade C
- Land purchase agreements: scope and value approx. 60000000 USD“T5 has now spent nearly $60M in the past year acquiring land there for its proposed hyperscale campus”News report · May 2025 · grade C
Permits and government (26)
- Village of Grayslake Village Board: Final approval action of the 2024-2025 T5 approval cycle“The final approval action of the 2024 to 2025 cycle occurred at the regular meeting of the Village Board held on May 6, 2025”Court filing · July 2026 · grade A
- Governor Pritzker paused the Illinois Data Center Investment Program for new projects effective July 1, 2026. T5@Chicago IV was certified in 2025, before the pause; the pause does not revoke its certification“Gov. JB Pritzker paused the Data Center Investment Program effective July 1, 2026”State agency · July 2026 · grade A
- Site plan approval date: May 6, 2025 (final approval action of the 2024-2025 cycle)“The final approval action of the 2024 to 2025 cycle occurred at the regular meeting of the Village Board held on May 6, 2025”Court filing · May 2025 · grade A
- State data center certification (sales/use tax exemption): certified“T5@Chicago IV, LP — 2025 — Grayslake — $250,000,000 — $15,625,000 — 20”State agency · 2025 · grade A
- Approvals status: Village land-use approvals received; campus approved near Peterson Road (Village of Grayslake official page). The village notes it cannot answer further questions due to filed litigation over the approv“after a number of Plan Commission and Village Board meetings, a data center campus has been approved near Peterson Road”Local government · Oct. 2026 · grade B
- Air construction permit (diesel backup generators): none found“This application requires JavaScript! ... These include: Air permits (construction and operating)”State agency · Oct. 2026 · grade B
- T5's live Lever board lists 89 open postings, including Chicago, IL construction and operations roles (Director of Construction; Critical Facilities Manager; MEP Senior Project Manager) serving its existing Chicago campu“Director of Construction | Chicago, IL | Construction”Company · Oct. 2026 · grade B
- Data center campus approvals (PUD amendment, special use permits, planned develo: approved, approval cycle completed“September 23, 2024; November 19, 2024; January 13, 2025; February 18, 2025; April 14, 2025; May 6, 2025”Local government · Aug. 2026 · grade B
- Wetlands fill application (approx. 16 acres of isolated wetlands): application halted at Village urging; reported withdrawn“the developer of the data center campus made an application to the applicable agencies to replace 16 acres of isolated wetlands on the campus site... Recently, the campus developer has put a halt to the application”Local government · Aug. 2026 · grade B
- Village of Grayslake (Village Board / public hearings): First public hearings of the T5 data center campus approval cycle“September 23, 2024 (data center related plan approvals, multiple public hearings same date)”Local government · Aug. 2026 · grade B
- FAA obstruction evaluation (7460-1): Determined - No Hazard“ASN 2026-AGL-10093-OE: T5 Chi IV Grayslake, Commercial Use Building, 85 ft AGL, 904 ft AMSL, 42.31575,-88.05220, Determined - No Hazard, submitted 2026-08-12”FAA · Aug. 2026 · grade B
- PUD amendment (Cornerstone west parcel: residential to office/R&D/light industri: recommended for approval“The Plan Commission/Zoning Board of Appeals recommended approval of the amendment that same evening”Court filing · July 2026 · grade B
- Village of Grayslake Plan Commission / Zoning Board of Appeals: Alter Group petition to amend Cornerstone PUD special use permit and general development plan (west parcel: residential to office, R&D, light industrial, re“the public hearing was opened at 6:02 p.m. and closed at 6:03 p.m.; and that there was no public comment”Court filing · July 2026 · grade B
- Tallest structure filed with the FAA (ft): 150 ft“ASN 2026-AGL-11407-OE: T5 CHI IV Data Center Buildings, Building, 150 ft AGL, 974 ft AMSL, 42.31624,-88.05318, Determined - No Hazard, submitted 2026-07-21”FAA · July 2026 · grade B
- FAA obstruction evaluation (7460-1): Determined - No Hazard“ASN 2026-AGL-11407-OE: T5 CHI IV Data Center Buildings, Building, 150 ft AGL, 974 ft AMSL, 42.31624,-88.05318, Determined - No Hazard, submitted 2026-07-21”FAA · July 2026 · grade B
- FAA obstruction evaluation (7460-1): Determined - No Hazard“ASN 2026-AGL-10189-OE: T5 CHI IV Grayslake, Crane, 185 ft AGL, 994 ft AMSL, 42.31583,-88.05250, Determined - No Hazard, submitted 2026-06-24”FAA · June 2026 · grade B
- FAA OE/AAA filings under the campus's own name evidence vertical construction at the T5 Grayslake (CHI IV) campus: 'T5 CHI IV Data Center Buildings' (150 ft, July 21, 2026), 'T5 Chi IV Grayslake' building (85 ft, Aug. 12, 2026“ASN 2026-AGL-10189-OE: T5 CHI IV Grayslake, Crane, 185 ft AGL, 994 ft AMSL, 42.31583,-88.05250, Determined - No Hazard, submitted 2026-06-24”FAA · June 2026 · grade B
- Building permit, first data center building (800,000 sq ft): issued“On September 1, the village announced that it had granted the first building permit for T5 @ Chicago IV, an 800,000-square-foot first component”News report · Sept. 2026 · grade C
- Lake County Board: Adoption of eight-month data center moratorium for unincorporated areas (amendment to Chapter 151 of the county ordinance code)“Tuesday's full board approval takes effect immediately, with a planned expiration date of May 11, 2027. The action only covers properties in unincorporated areas”News report · Sept. 2026 · grade C
- Moratoria: Lake County: eight-month moratorium on data center construction in unincorporated areas, adopted Sept. 8, 2026, expires May 11, 2027, does not apply to the Village of Grayslake (municipal)“an eight-month moratorium on data center construction passed muster Sept. 8 at the Lake County board level... with a planned expiration date of May 11, 2027. The action only covers properties in unincorporated areas”News report · Sept. 2026 · grade C
- Foundation and site development permit, first building: issued“A building foundation and site development permit have been issued for the first building”News report · Sept. 2026 · grade C
- Lake County Board adopted an eight-month moratorium on data centers in unincorporated areas (expires May 11, 2027), a direct political response to the Grayslake campus, though it cannot reach the municipal site“The flashpoint for the county's actions revolved around the Grayslake T5 @ Chicago IV Data Center”News report · Sept. 2026 · grade C
- Lake County Zoning Board of Appeals: Recommendation of an eight-month moratorium on data centers in unincorporated Lake County“The board unanimously voted to recommend an eight-month moratorium on data centers in unincorporated areas”News report · Sept. 2026 · grade C
- First building sq ft: 800000 sq ft“the village announced that it had granted the first building permit for T5 @ Chicago IV, an 800,000-square-foot first component”News report · Sept. 2026 · grade C
- Construction stage: first building under construction, foundation/site permit issued; building permit for the first 800,000 sq ft building issued Sept. 1, 2026; site work under way“At present, T5 has received their permits for the first building and work is beginning, as per the normal construction process”News report · Sept. 2026 · grade C
- Village issued the first building permit (800,000 sq ft building); construction began while the lawsuit is pending“On September 1, the village announced that it had granted the first building permit for T5 @ Chicago IV”News report · Sept. 2026 · grade C
Legal (4)
- Lawsuits: Preservation of Community Well-being Collective LLC et al. v. Village of Grayslake, T5 Data Centers, LLC and Alter Asset Management Company, Case No. 2026CH00000171, Circuit Court of Lake County (19th Judicial“COMPLAINT FOR DECLARATORY AND INJUNCTIVE RELIEF... 2026CH00000171”Court filing · July 2026 · grade A
- Residents' suit filed in Lake County Circuit Court (Case No. 2026CH00000171) seeking to void the 2024-2025 approvals and the Village-T5 development agreements and to enjoin further permits; grounds: zoning ordinance does“Plaintiffs ask this Court to declare the approvals invalid, to enjoin further building permits or site work pursuant to those approvals, to void the development agreements executed in connection with them”Court filing · July 2026 · grade A
- Initial status hearing scheduled, 9 a.m., Lake County Courtroom 301 (per Lake & McHenry County Scanner via Startup Fortune)“An initial status hearing is set for 9 a.m. on October 30 in Lake County Courtroom 301”News report · grade C
- Village of Grayslake filed a motion to dismiss (arguing 90-day limit for zoning/due-process judicial review and 60-day limit for Open Meetings Act claims); motion pending as of mid-September 2026“On 8/25/26, lawyers for the Village filed a Motion to Dismiss”News report · Aug. 2026 · grade C
Site and other (18)
- Aliases: T5@Chicago IV; T5 @ Chicago IV; Cornerstone data center campus“The approved campus, known as T5@Chicago IV”Court filing · July 2026 · grade A
- Address: 30907 North Alleghany Road, Grayslake, Illinois“The anchor parcel is identified as Lake County Permanent Index Number 10-10-200-014, with a street address of 30907 North Alleghany Road, Grayslake, Illinois”Court filing · July 2026 · grade A
- Parcel IDs: 10-10-200-014 (anchor parcel)“The anchor parcel is identified as Lake County Permanent Index Number 10-10-200-014”Court filing · July 2026 · grade A
- Opposition: Preservation of Community Well-being Collective LLC and nine resident plaintiffs; Lake County Data Center Opposition Coalition; Saddlebrook Farms (55+) residents; opposition statements by Village of Mundelein“Plaintiffs, Preservation of Community Well-being Collective LLC... Suzanne P. Williams, Robin A. Weller, Pamela A. Hermon, Marion L. Eickhoff, Gabriela U. Appelt, Mary Anne Fortmann, Robert C. Baum, Cheryl Feddor, and Gavin Rychener”Court filing · July 2026 · grade A
- County code: 17097“FCC Census Block API at 42.335538,-88.040427: County FIPS 17097, Lake County, Illinois”Dataset · Oct. 2026 · grade B
- Name: T5 Grayslake (CHI IV)“the data center campus in Grayslake”Local government · Aug. 2026 · grade B
- Developer: T5 Data Centers“Atlanta-based T5 Data Centers campus approved in Grayslake (village FAQ identifies developer throughout)”Local government · Aug. 2026 · grade B
- Operator: T5 Data Centers“data center campus to be built in Grayslake by T5 (village FAQ)”Local government · Aug. 2026 · grade B
- Acres: 473 acres“The approved data center campus is located on 473 acres in the Peterson Road corridor”Local government · Aug. 2026 · grade B
- County: Lake County, Illinois“located on 473 acres in the Peterson Road corridor, Village of Grayslake, Lake County”Local government · Aug. 2026 · grade B
- Cooling: closed-loop water cooling“these data centers will use a closed loop water system with minimal water usage”Local government · Aug. 2026 · grade B
- Water use stated: approx. 50,000 gallons per day campus-wide at the 6.75M sq ft plan; approx. 2,500-3,500 gallons per day per building gal/day“For the current proposed 6.75 million square foot campus, the average daily water use of all buildings combined will be approximately 50,000 gallons per day”Local government · Aug. 2026 · grade B
- Permanent jobs estimate: 1200-1600 operations jobs (village estimate); 750-1,000 construction jobs per year during build-out“it is currently estimated that between approximately 1,200 and 1,600 operations jobs will be created”Local government · Aug. 2026 · grade B
- T5 halted/withdrew its application to fill approx. 16 acres of isolated wetlands after the Village urged it to change course; Village FAQ (Aug 2026) says the application was halted; opposition reporting says withdrawn Ju“Recently, the campus developer has put a halt to the application related to these 16 acres of wetlands”Local government · July 2026 · grade B
- Delay (months): 0 months“to be delivered in Q4 2027”News report · Oct. 2026 · grade C
- First protest against the campus held (Millennium Plaza, Grayslake); Lake County Data Center Opposition Coalition active through 2026; Erin Brockovich amplified the residents' case; Villages of Mundelein and Round Lake P“On June 13, 2026, the first protest against the data center was held in Millenium Plaza”News report · June 2026 · grade C
- Land control date: 193 acres acquired by May 2025; additional 32 acres acquired May 2025“the 32 acres T5 acquired in the North Shore community of Grayslake adds to 193 acres the firm already acquired in the town”News report · May 2025 · grade C
- Announced: May 2024“T5 first announced plans for a Grayslake campus in May 2024”News report · May 2024 · grade C
Imagery and records: Satellite and aerial imagery: Maxar and local aerial photography via Esri World Imagery Wayback. County deeds: ATTOM.