Data center profile · Northeast corner of 491st Avenue and Thomas Road, Harquahala Valley, near Tonopah, Maricopa County, Arizona

491st Avenue Campus (Tonopah)

638-acre site west of Phoenix rezoned Feb. 2026 for up to nine data-center buildings, next to a gas plant; no developer or confirmed power source.

Rezoned, no developer. Maricopa County approved the plan amendment and rezoning on Feb. 11, 2026, after a 9-0 planning recommendation and no known opposition. No developer, operator, power source or plan of development is on record, and construction permits cannot issue until a plan of development is approved.
638 acres
rezoned site
two parcels in unincorporated Maricopa County
9
buildings of about 250,000 sq ft in the concept plan
2.25M sq ft in total
26 acres
dedicated switchyard in the concept plan
plus on-site septic and a water campus
9-0
planning commission vote to recommend
Jan. 8, 2026; no known opposition
OperatorNone named; landowners Grandilla (Arizona) Inc. and Foot Creek Corporation applied
CustomerNone named
First building in serviceOur estimate: 2029 or later (no dated power path yet).
Next stepA plan of development must be approved before any construction permits; none is on record
Power

Power and the grid

Getting on the grid

Permits

Permits checklist

2 granted · 2 checked, nothing on file

County approvals on record; construction permits need further steps.

Risks

What could slow it down

Money

Money on record

Land assembly

2 recorded land documents for the campus company in county records (Sept. 2015 to Feb. 2017); 2 list a price. Parcel counts come from the deed; acreage is not recorded.

Timeline

What happened, and what is due

SitePaper trailConstructionPowerPermitsMoneyLegalUpcoming
  1. Sept. 16, 2015
    Money Land purchase by Grandilla Arizona Inc and Cactus 1344 LLC recorded at $990,000; seller not named (4 parcels) County deed records · Sept. 2015
  2. Feb. 28, 2017
    Money Land purchase by Grandilla Arizona Inc recorded at $5.9M; seller not named (4 parcels) County deed records · Feb. 2017
  3. Nov. 2025
    Site Landowners' narrative lays out nine 250,000 sq ft buildings and a 26-acre switchyard Local government · Nov. 2025
  4. Jan. 8, 2026
    Permits Planning and Zoning Commission recommends approval 9-0 Local government · Jan. 2026
  5. Feb. 11, 2026
    Permits Board of Supervisors approves the plan amendment and rezoning Local government · Feb. 2026
The buildings

Specs

2.25M sq ft
nine buildings of about 250,000 sq ft each
Local government · Nov. 2025
IND-2 IUPD
industrial zoning, from Rural-43
Local government · Feb. 2026
80 ft
maximum building height in the conditions
Local government · Jan. 2026
Who is involved

Owners, partners and builders

Owners
  • Grandilla (Arizona) Inc. and Foot Creek Corporation: landowners and applicants
  • Withey Morris Baugh, PLC (Jason Morris): legal representative
Decision-makers
  • Maricopa County Board of Supervisors
  • Maricopa County Planning and Zoning Commission
  • Defense Department Siting Clearinghouse: review before a plan of development
Builders
  • Colliers Engineering & Design: civil engineer
Still unknown

Open questions

Where this comes from

40 records from 7 documents

Drawn from news reports, local government records and public and commercial datasets, each kept with its date and source. The bar shows documents by type.

News report 5Local government 1Dataset 1
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 (8)
  • Power source status: not confirmed - the applicant's county narrative states the specific power source has not yet been confirmed
    “Although the specific power source has not yet been confirmed, the presence of significant nearby energy infrastructure supports the feasibility of largescale industrial development at this location.”
    Local government · Nov. 2025 · grade A
  • On-site infrastructure: dedicated switchyard (about 26 acres), onsite septic facilities and a water campus planned as backbone infrastructure (conceptual site plan)
    “key strategic infrastructure will provide the backbone for development, including a dedicated switchyard (±26 acres), onsite septic facilities, and a water campus”
    Local government · Nov. 2025 · grade A
  • No source retrieved names an operator, end user, or serving utility for the 491st Avenue site; APS is the incumbent utility in the Tonopah area but no campus document names APS (or SRP, or any utility), so NO utility is
    “The site is owned by Grandilla Arizona Inc. and Foot Creek Corporation.”
    News report · Oct. 2026 · grade C
  • the pool grows to 38 data centers providing approximately 287.2 MW of critical load, generating approximately $555.2 million AMRR and $312.2 million AANOI as of June 2026; No ABS-15G for this issuance had been filed on E
    “The 38 data centers are comprised of approximately 1,744,593 square feet (sf) of data center space and can provide approximately 287.2 megawatts (MW) of critical load power to customers.”
    News report · Oct. 2026 · grade C
  • The campus site is close to the Harquahala Generating Facility (~1 GW CCGT, Capital Power / BlackRock). Proximity only: Harquahala's capacity is NOT campus generation and no source ties it to this campus's supply.
    “The land is close to Capital Power's Harquahala Generating Facility, a 1GW combined cycle gas-generation facility.”
    News report · Sept. 2026 · grade C
  • Project narrative as reported by DCD: at full build-out up to nine 250,000 sq ft data center buildings totaling 2.25 million sq ft on the 638-acre site; the IND-2 rezoning also allows substations, battery storage and on-
    “At full build-out, the site could be home to as many as nine 250,000 sq ft data center buildings totaling 2.25 million square feet”
    News report · Feb. 2026 · grade C
  • KBRA final ratings Feb. 9, 2026), the fifth issuance under its colocation master trust; The shared collateral pool is 36 data centers (22 fee-simple in ten markets, 14 leasehold in 11 markets) providing approximately 257.6
    “The 36 data centers are comprised of approximately 1,621,139 square feet (sf) of data center space and can provide approximately 257.6 megawatts (MW) of critical load power to customers.”
    News report · Jan. 2026 · grade C
  • DataBank Series 2026-1 (and the 2026-2/3/4 follow-on) collateral is a pool of 36-38 operating multi-customer data centers (257.6-287.2 MW) whose per-property schedules are not public (KBRA publishes aggregates only); Key
    “The 36 data centers are comprised of approximately 1,621,139 square feet (sf) of data center space and can provide approximately 257.6 megawatts (MW) of critical load power to customers.”
    News report · Jan. 2026 · grade C
Money and contracts (4)
  • The site sits next to existing Harquahala Valley generation: the county staff report notes a large gas-powered generating station adjacent to the immediate southwest, and DCD identifies the nearby plant as Capital Power'
    “except for a large gaspowered APS power generating station located adjacent to the immediate southwest.”
    Local government · Jan. 2026 · grade A
  • Planned buildings: 9 buildings
    “The conceptual site plan identifies nine (9) industrial buildings, each with a footprint of approximately 250,000 square feet, for a total building area of 2.25 million square feet.”
    Local government · Nov. 2025 · grade A
  • Land purchase (recorded deed): contract value 5861575 USD
    “Recorded: Feb. 28, 2017 · Price: $5,861,575 · Grantee: GRANDILLA ARIZONA INC · Parcel number: 506-35-660 · City: TONOPAH”
    County deed records · Feb. 2017 · grade B
  • Land purchase (recorded deed): contract value 990000 USD
    “Recorded: Sept. 16, 2015 · Price: $990,000 · Grantee: GRANDILLA ARIZONA INC · Parcel number: 506-73-001 · City: TONOPAH”
    County deed records · Sept. 2015 · grade B
Permits and government (9)
  • Project status: Comprehensive Plan Amendment (CPA250009) and rezoning (Z250027, Rural-43 to IND-2 IUPD) APPROVED by the Maricopa County Board of Supervisors on Feb 11, 2026; no plan of development or site plan has been a
    “Administrative approval of a plan of development will be required prior to approval and issuance of construction permits to develop and establish use of the site.”
    Local government · Feb. 2026 · grade A
  • Zoning: IND-2 IUPD (from Rural-43 / RU-43); Comprehensive Plan designation changed from Rural Development Area to Utilities; permitted uses include data centers and accessory uses, electric substations and battery storag
    “Zone change with overlay from Rural-43 to IND-2 IUPD”
    Local government · Feb. 2026 · grade A
  • Commission voted 9-0 to recommend approval of CPA250009, and 9-0 to recommend ap: recommended approval of both the Comprehensive Plan Amendment and the zone change (consent agenda)
    “On 1/8/26, the Commission voted 9-0 (motion by Commissioner Toma D4, seconded by Commissioner Lindblom D1) to adopt a motion recommending the Board of Supervisors approve CPA250009.”
    Local government · Jan. 2026 · grade A
  • Maricopa County Planning & Zoning Commission:
    “On 1/8/26, the Commission voted 9-0 (motion by Commissioner Toma D4, seconded by Commissioner Lindblom D1) to adopt a motion recommending the Board of Supervisors approve Z250027 subject to conditions ‘a’ – ‘j’”
    Local government · Jan. 2026 · grade A
  • The county staff report states there was no known opposition and one letter of support from a nearby landowner; the Planning Commission recommendation was unanimous (9-0).
    “There is no known opposition and one letter in support from a nearby landowner.”
    Local government · Jan. 2026 · grade B
  • Month precision (approval reported September 2026). 638 acres at the NE corner o: Rezoning to IND-2 APPROVED
    “The rezoning, to IND-2 Zoning District, allows for industrial uses including data centers and accessory uses, electric substations, battery storage, and power generation facilities”
    News report · Sept. 2026 · grade C
  • Project status: rezoning and comprehensive plan amendment approved Feb 11, 2026; no operator, developer or site plan named
    “the Maricopa County Board of Supervisors last week approved a request to rezone a 638-acre site located at the northeast corner of 491st Avenue and Thomas Road”
    News report · Feb. 2026 · grade C
  • Approval reported by Data Center Dynamics (citing BizJournal) the following week: APPROVED the Comprehensive Plan Amendment (by Resolution) and the zone change to IND-2 IUPD
    “the Maricopa County Board of Supervisors last week approved a request to rezone a 638-acre site located at the northeast corner of 491st Avenue and Thomas Road, outside Tonopah”
    News report · Feb. 2026 · grade C
  • Maricopa County Board of Supervisors:
    “the Maricopa County Board of Supervisors last week approved a request to rezone a 638-acre site located at the northeast corner of 491st Avenue and Thomas Road, outside Tonopah”
    News report · Feb. 2026 · grade C
Legal (1)
  • The county record states there is no known opposition to CPA250009 / Z250027 and one letter in support from a nearby landowner; no lawsuit, petition, moratorium or denial affecting this campus was found (contrast the org
    “There is no known opposition and one letter in support from a nearby landowner.”
    Local government · Feb. 2026 · grade A
Site and other (4)
  • Project identity: Proposed data center campus at the northeast corner of 491st Avenue and Thomas Road, Harquahala Valley, Tonopah (unincorporated Maricopa County), AZ; APNs 506-30-021A and 506-30-024A
    “Site Location: Generally located at the NEC of Thomas Rd & 491st Ave in the Harquahala Valley area”
    Local government · Feb. 2026 · grade A
  • Site acres: 638 acres
    “Site Size: Approximately 638 acres”
    Local government · Feb. 2026 · grade A
  • Developer status: no operator or developer named in any record retrieved - the applicants of record are the landowners Grandilla Arizona Inc. and Foot Creek Corporation, represented by Withey Morris Baugh, PLC
    “Applicant/Owner: Jason Morris, Withey Morris Baugh, PLC / Grandilla (Arizona) Inc. and Foot Creek Corporation”
    Local government · Feb. 2026 · grade A
  • County code: 04013
    “Site Location: Generally located at the NEC of Thomas Rd & 491st Ave in the Harquahala Valley area”
    Local government · Feb. 2026 · grade B

Imagery and records: County deeds: ATTOM.