Data Center Atlas
Yondr Project Allegro Data Center Campus (Aldie, Loudoun County)
Permitted
United States · 1 project · Last reported
Summary
Loudoun County issued building permit BLDC-2026-004245 on 19 October 2026 for 'YONDR NOV2A CORE/SHELL & PH 1 (OFFICE & DATA HALL 2.2)', a 147,829 sq ft new-construction data-centre building at 42455 Allegro Ln, Aldie. The county records the same parcel's grading permit as 'Project Allegro North Campus Building 2A Data Center' under site plan EPLAN-2023-0104. Physical construction, completion and operation are not established; later phases beyond phase 1 and the other North Campus buildings are outside this record. evidence
Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) · published 2026-10-22
Location
The interactive map needs JavaScript. Display anchor: 38.95450, -77.54824 (Point locator, WGS 84).
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Campus reference; individual project footprints are not mapped.
Projects (1)
Yondr NOV2A — Allegro North Campus Building 2A core/shell and phase 1 (42455 Allegro Ln)
Permitted last observed as of · Development consent
County applications for Yondr's Project Allegro campus near Evergreen Mills Road. EPLAN-2023-0104 'Allegro North Campus - Building 2A' (application 27 October 2023; In Review; 'Conditional Approval' STPL, 'Data Center and support facilities') has the same 14.32-acre polygon as PIN 202260981000, as do performance bonds PBOND-2026-0142/0143 (17 September 2026, In Review) and PCOR-2026-0049 (Approved), which names Yondr JK 2, LLC at 42455 Allegro Lane for a Virginia DEQ air permit application. EPLAN-2023-0130 (Buildings 2B-2E site plan, In Review) covers 63.69 acres that wholly contain the Building 2A parcel, and EPLAN-2025-0033 (Building 2F mass grading, Approved) adjoins it; together the North Campus plan areas cover about 75 acres. The approved Project Allegro South Campus Phase 2 site plan STMP-2022-0026 (data center and support facilities, 335,000 sq ft) adjoins the Building 2A parcel to the south. A separate Yondr-Tarring special exception (SPEX-2025-0128, In Review) concerns a different property. evidence
Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) · publication date not stated
The county address point for 42455 Allegro Ln, Aldie on PIN 202260981000 is at longitude -77.54788024, latitude 38.95474349, inside the parcel and 41 m from its centroid. evidence
Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) · publication date not stated
Source and location review
- Status source
- Loudoun County LandMARC permits issued for PIN 202260981000 (42455 Allegro Ln, Aldie) — Yondr NOV2A / Allegro North Campus Building 2A evidence row
Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) · published 2026-10-22 · Government record - Locator
- Campus locator · Official source · official_parcel_polygon_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 verificationStatus age at review: 8 days before the data update on 2026-10-27
Location details
- Coordinates
- 38.95450, -77.54824
- Geometry licence
- public-record-source-terms
- Use scope
- Campus locator
- Scope class
- official_parcel_polygon_centroid
- Authority
- Official source
- Source entity
- Campus
- Method
- official_county_parcel_polygon_centroid
- Derivation
- direct_geometry
- Precision scope
- Planar centroid of the two-part Loudoun County parcel 202260981000 (42455 Allegro Ln, Aldie; 14.32 acres, about 331 by 352 m), which carries the NOV2A building permit and coincides with the Building 2A site-plan polygon. It locates the Building 2A property at the south-west of Yondr's Allegro North Campus, whose other plan areas extend up to about 0.7 km to the north-east; the South Campus Phase 2 plan area adjoins it to the south. It is not a building footprint or works extent.
- Horizontal uncertainty
Not reported
The county publishes no positional accuracy for parcel polygons; the centroid represents a 14-acre, two-part parcel within a campus of roughly 0.8 by 1.4 km.
- Geometry evidence
- 759fedbf
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.
| Title | Publisher | Roles | Published | Retrieved | Licence | Attribution | Content hash (SHA-256) |
|---|---|---|---|---|---|---|---|
| Loudoun County address point: 42455 Allegro Ln, Aldie (PIN 202260981000) Archived copy | Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) Government record | Site and project identity | not stated | public-record-source-terms | Loudoun County, Virginia | 98acdd2e57713ecd19932b301ebfccdd13eed7ded3991f44a4d7191e945b3671Retained source material; see source provenance | |
| Loudoun County LandMARC permits issued for PIN 202260981000 (42455 Allegro Ln, Aldie) — Yondr NOV2A / Allegro North Campus Building 2A Archived copy | Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) Government record | Development consent | public-record-source-terms | Loudoun County, Virginia | 20b1ed6e897806166ceb18f159f6a5d2a5d0a2c490f679e8bd5e85d9559bd2f6Retained source material; see source provenance | ||
| Loudoun County LOLA land-development applications named Allegro or Yondr Archived copy | Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) Government record | Site and project identity | not stated | public-record-source-terms | Loudoun County, Virginia | e24fe99e49cee3aea5f0d0375043cc7f9a010523f96e101beab9fac068c1d7bcRetained source material; see source provenance | |
| Loudoun County parcel 202260981000 (Evergreen Meadows, plat 2024-0115; 42455 Allegro Ln) Archived copy | Loudoun County, Virginia (Department of Building and Development / Office of Mapping and Geographic Information) Government record | Geometry | not stated | public-record-source-terms | Loudoun County, Virginia | 30a13a81466778bc95a1bbad0133aae4146d6241017aad8de82d5beacf60515bRetained source material; see source provenance |
Cite this site
Kyars, K. (2026). Yondr Project Allegro Data Center Campus (Aldie, Loudoun County) [site vcc-site-f32edd5086d6199f35be]. In Data Center Atlas (2026-10-27) [Data set]. https://kiankyars.github.io/datacenter-atlas/sites/vcc-site-f32edd5086d6199f35be/
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