CyrusOne Mesa PHX20 Data Center Campus (3255 S 96th St, Mesa, Arizona)

Name: CyrusOne Mesa PHX20 Data Center Campus (3255 S 96th St, Mesa, Arizona)
Address: US

Under construction

United States · 1 project · Last reported 2026-10-16

Summary

The City of Mesa's public building-inspection records for 3255 S 96th St show city inspectors approving or partially approving construction of CyrusOne's Mesa Shell Building 1 throughout the 85 days to 16 October 2026. On its building permit PMT25-13240 ('CyrusOne Mesa -Shell Building 1', a two-storey 243,332 sq ft shell data hall building with partial data-hall fit-out) they recorded 59 approvals or partial approvals between 2 August and 21 October 2026, including framing (to 6 October), pre-slab/interior footing (to 25 September), electrical rough-in (to 14 September), electric underground (6 October), a combined rough-frame MEP inspection (15 October) and footing and plumbing rough-in partial approvals on 16 October 2026, the latest named construction inspections. This records Shell Building 1 as under construction on 16 October 2026. Partial approvals cover the inspected portions only; no certificate of occupancy or final inspection has been recorded, and completion, operation, IT capacity and customers are not established. The Building 1 Phase 2 data-hall fit-out (PMT26-17452) is not yet issued and is not part of this record. evidence

City of Mesa, Arizona (Development Services) · published 2026-10-24

Location

The interactive map needs JavaScript. Display anchor: 33.35572, -111.62285 (Point locator, WGS 84).

View location: OpenStreetMap · Google Maps · Bing aerial · Copernicus Browser

Campus reference; individual project footprints are not mapped.

Projects (1)

CyrusOne Mesa PHX20 — Shell Building 1, two-storey 243,332 sq ft data hall building under construction (Mesa permit PMT25-13240)

Under construction last observed as of 2026-10-16 · Authoritative status update

The permit dataset returns nine commercial permits at 3255 S 96TH ST, parcel 30404984A (one trailer permit cites 30404984). Building permit PMT25-13240 'CyrusOne Mesa -Shell Building 1' (issued 30 December 2025; 243,332 sq ft) is for 'Shell data hall building 1, construction type II-B, two story 243,332 SF total building' with precast wall panels, insulated metal panel and curtain wall, which 'will function as a data center and adjacent office, storage and loading dock', plus partial interior data hall fit-out; data hall fit-out and admin completion will receive a certificate of occupancy under PMT25-22845 ('CyrusOne Mesa - Shell Build Out', 76,001 sq ft, Fees Due). Other permits: civil improvements 'PHASE 1 IMPROVEMENT PLANS FOR CYRUSONE - MESA ERTC' (PMT25-11012, issued 5 November 2025), electrical gear and power skids 'to power up building 1' (PMT26-03064, issued 23 March 2026), construction-trailer use permits referencing PMT25-13240 (trailer removal estimated 31 March 2027 and 1 April 2028), an emergency-responder radio system titled 'CyrusOne Mesa Bldg 1 – PHX20' (PMT26-13840, Revisions Required), a lunch-tent fire alarm (PMT26-16340, issued 30 September 2026) and 'EXPEDITE- CyrusOne Mesa Building 1 Phase 2' (PMT26-17452, Revisions Required: interior fit-out of one data hall and a second equipment yard). evidence

City of Mesa, Arizona (Development Services) · published 2026-10-25

Dataset 'Building Inspections - Public' (attribution Development Services) is a view of the city's building inspections that redacts the inspector and requester names. Its rowsUpdatedAt value is 1792804433 (2026-10-24T01:13:53Z), showing that the inspection rows captured on 26 October 2026 were current to 24 October 2026. evidence

City of Mesa, Arizona (Development Services) · published 2026-10-24

Dataset 'Building Permits' (attribution Development Services) reports dataUpdatedAt 2026-10-25T19:57:29+0000, showing that the permit rows captured on 26 October 2026 were current to 25 October 2026. evidence

City of Mesa, Arizona (Development Services) · published 2026-10-25

The owner query returns two parcels county-wide: 304-04-984A (C1-MESA LLC, Dallas TX; 3255 S 96th St, Mesa; 2,896,785 sq ft) and 303-36-270 (CYRUSONE TRS INC, Dallas TX; Chandler, no situs address; 706,983 sq ft; deed of 1 July 2026). Both owners share the Dallas mailing city. evidence

Maricopa County Assessor, Arizona · publication date not stated

Companies

Owner: C1-MESA LLC (current) evidence
Operator: CyrusOne (intended) evidence

Source and location review

Status source

City of Mesa Building Inspections - Public (cu25-6qwx): inspections scheduled since 1 July 2026 at 3255 S 96th St (CyrusOne Mesa Shell Building 1, PMT25-13240, and site permits) evidence row
City of Mesa, Arizona (Development Services) · published 2026-10-24 · Government record

Locator

Campus locator · Official source · official_tax_parcel_centroid evidence

Source checks

Not reviewed against imagery not_reviewed
No imagery review is recorded for this project. Its status rests only on the dated authoritative source. · no independent imagery verification

Status age at review: 11 days before the data update on 2026-10-27

Location details

Coordinates: 33.35572, -111.62285
Geometry licence: public-record-source-terms
Use scope: Campus locator
Scope class: official_tax_parcel_centroid
Authority: Official source
Source entity: Campus
Method: official_county_assessor_parcel_centroid
Derivation: direct_geometry
Precision scope: Centroid of Maricopa County Assessor parcel 304-04-984A (situs 3255 S 96th St, Mesa; owner of record C1-MESA LLC; 66.50 geodesic acres, about 771 by 361 m), the parcel cited by every City of Mesa permit for the CyrusOne Mesa development and the parcel that contains the city's permit geocode. It locates the CyrusOne Mesa property, not the Shell Building 1 footprint, a surveyed boundary or the works extent.
Horizontal uncertainty: Not reported
The assessor publishes no positional accuracy for parcel polygons; the centroid represents a 66.5-acre parcel, and the position of Shell Building 1 within it is not published.
Geometry evidence: ed9f8ef0

A locator places the site on the map. It is not a building footprint, a construction extent or a surveyed boundary unless the use scope is an official boundary, and even then it is a parcel or permit boundary.

Evidence

Sources are linked, not redistributed; each keeps its own terms. An archived copy is a lookup for the Wayback Machine capture nearest the retrieval date and may be unavailable or differ from what was reviewed. Each hash states what it covers; imported factual records are not publisher-page captures.

Evidence for CyrusOne Mesa PHX20 Data Center Campus (3255 S 96th St, Mesa, Arizona)
Title	Publisher	Roles	Published	Retrieved	Licence	Attribution	Content hash (SHA-256)
City of Mesa Building Inspections - Public (cu25-6qwx): inspections scheduled since 1 July 2026 at 3255 S 96th St (CyrusOne Mesa Shell Building 1, PMT25-13240, and site permits) Archived copy	City of Mesa, Arizona (Development Services) Government record	Physical status	2026-10-24	2026-10-26	public-record-source-terms	City of Mesa, Arizona — Development Services building inspections open data (Building Inspections - Public)	`053eaa8678ab6b5aa03bb2370406f956fcb98cd35bc6d6148411f6d5dbd24330` Retained source material; see source provenance
City of Mesa Building Permits (dzpk-hxfb): all permits at 3255 S 96th St (CyrusOne Mesa / PHX20), selected fields Archived copy	City of Mesa, Arizona (Development Services) Government record	Site and project identity, Operator claim	2026-10-25	2026-10-26	public-record-source-terms	City of Mesa, Arizona — Development Services building permits open data	`0ded41bdc8a49b4f7db66133684af63d3ac6bd6039e57545a449a053d75ef654` Retained source material; see source provenance
City of Mesa open data: Building Inspections - Public (cu25-6qwx) dataset metadata at retrieval Archived copy	City of Mesa, Arizona (Development Services) Government record	Site and project identity	2026-10-24	2026-10-26	public-record-source-terms	City of Mesa, Arizona — Development Services building inspections open data (Building Inspections - Public)	`adb8f9b2be59f0d05ee604ee6da3b0c7717bb7a97f7b23366faea959bc70ed9c` Retained source material; see source provenance
City of Mesa open data: Building Permits (dzpk-hxfb) dataset metadata at retrieval Archived copy	City of Mesa, Arizona (Development Services) Government record	Site and project identity	2026-10-25	2026-10-26	public-record-source-terms	City of Mesa, Arizona — Development Services building permits open data	`97a5a298dd095a7e569c29f9a67e4ec667e9fc2db7dc93ff9874f80feca31375` Retained source material; see source provenance
Maricopa County Assessor parcel at the City of Mesa geocode for 3255 S 96th St: APN 304-04-984A (C1-MESA LLC) Archived copy	Maricopa County Assessor, Arizona Government record	Geometry, Owner claim	not stated	2026-10-26	public-record-source-terms	Maricopa County Assessor’s Office	`ed9e0f6e898fc7fadb002b3ac57f77e72e0cbd3ab7683482897e67adf0980bd2` Retained source material; see source provenance
Maricopa County Assessor: parcels whose owner name begins C1-, CYRUSONE or CYRUS ONE Archived copy	Maricopa County Assessor, Arizona Government record	Site and project identity	not stated	2026-10-26	public-record-source-terms	Maricopa County Assessor’s Office	`dd1dd316b8d77044ab4d26afecdf2a395102e0b6b090d75526db01967628d381` Retained source material; see source provenance

Cite this site

Kyars, K. (2026). CyrusOne Mesa PHX20 Data Center Campus (3255 S 96th St, Mesa, Arizona) [site vcc-site-cf70f4b9add26d9ba26a]. In Data Center Atlas (2026-10-27) [Data set]. https://kiankyars.github.io/datacenter-atlas/sites/vcc-site-cf70f4b9add26d9ba26a/

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