Cartis diligence evidence schedule
Iron Mountain LON-3 London Data Center
PRJ-0954 · Site · Slough, England, United Kingdom
Captured 2026-09-06T04:13:42.648Z · Record last updated 2026-08-28
SHA-256: 0b2ab1003b48f010978a34286407c0974643c678a3b65d408bb4cea7b7448d9e
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Scope and capacity
LON-3 is the third Iron Mountain building at Slough and remains under construction. Its 25 MW is a future facility boundary; Q2 2026 reporting gives Q1 2027 expected completion, no pre-leased MW and $391.9 million total expected investment. None of those values is represented as operating capacity. Customer utilization, private contract terms and unreported project financing remain outside the verified public record.
Headline: 25 MW Planned critical IT
Numbers refer to their stated physical boundaries and are not added together. Source dates, claim dates and record updates have different meanings. Missing dates and locators are not inferred.
Claims and exhibit sources
Location Context · LON-3 | Slough | England | GB
actual · Iron Mountain LON-3 London Data Center (project)
Claim 65738 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Lifecycle Status · Construction
actual · Iron Mountain LON-3 London Data Center (project)
Claim 65739 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Reported Capacity · 25 MW
design · Iron Mountain LON-3 London Data Center (project)
Claim 65740 · Review: Approved · Claim date: Not published
Headline treatment: Selected headline
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Capacity Basis · Iron Mountain publishes 25 MW for the LON-3 facility record boundary.
actual · Iron Mountain LON-3 London Data Center (project)
Claim 65741 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Location Context · LON-3 | Slough | England | GB
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89163 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Lifecycle Status · Construction
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89164 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Reported Capacity · 25 MW
Planned / design or future potential · Iron Mountain LON-3 London Data Center (project)
Claim 89165 · Review: Approved · Claim date: Not published
Headline treatment: Separate claim, not added to the headline
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Capacity Basis · 25 MW is a future LON-3 build boundary. Q2 2026 reporting gives Q1 2027 expected completion and shows no pre leased MW; it is not operating capacity.
Planned / design or future potential · Iron Mountain LON-3 London Data Center (project)
Claim 89166 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Operator Or Developer · Iron Mountain Data Centers
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89167 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Project Location · Slough, England, GB
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89168 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Current Lifecycle · Under development
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89169 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Capacity Classification · Future potential
Planned / design or future potential · Iron Mountain LON-3 London Data Center (project)
Claim 89170 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Capacity Basis · 25 MW is a future LON-3 build boundary. Q2 2026 reporting gives Q1 2027 expected completion and shows no pre leased MW; it is not operating capacity.
Planned / design or future potential · Iron Mountain LON-3 London Data Center (project)
Claim 89171 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Customer Utilization · Not publicly disclosed
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89173 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Source Refresh Date · 2026-08-29
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89175 · Review: Approved · Claim date: Not published
- Iron Mountain LON-3 facility profile
Iron Mountain Data Centers · Document date: 2026-08-28 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london/lon-3
Renewable Energy Matching · Operator states 100% matched renewable energy where applicable
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89176 · Review: Approved · Claim date: Not published
- Iron Mountain London campus current profile
Iron Mountain Data Centers · Document date: 2026-08-29 · Primary
https://www.ironmountain.com/data-centers/locations/emea/london
Sec Capacity Comparison · Q2 2026 leaseable and development schedules reviewed
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89177 · Review: Approved · Claim date: Not published
- Iron Mountain Q2 2026 supplemental financial information
Iron Mountain Incorporated / U.S. SEC · Document date: 2026-08-06 · Primary
https://www.sec.gov/Archives/edgar/data/1020569/000102056926000068/q22026srpfinal.htm
Expected Completion · Q1 2027
forecast · Iron Mountain LON-3 London Data Center (project)
Claim 89178 · Review: Approved · Claim date: Not published
- Iron Mountain Q2 2026 supplemental financial information
Iron Mountain Incorporated / U.S. SEC · Document date: 2026-08-06 · Primary
https://www.sec.gov/Archives/edgar/data/1020569/000102056926000068/q22026srpfinal.htm
Preleased Percent · 0 percent
actual · Iron Mountain LON-3 London Data Center (project)
Claim 89179 · Review: Approved · Claim date: Not published
- Iron Mountain Q2 2026 supplemental financial information
Iron Mountain Incorporated / U.S. SEC · Document date: 2026-08-06 · Primary
https://www.sec.gov/Archives/edgar/data/1020569/000102056926000068/q22026srpfinal.htm
Total Expected Investment · $391,900,000
transaction scope · Iron Mountain LON-3 London Data Center (project)
Claim 89180 · Review: Approved · Claim date: Not published
- Iron Mountain Q2 2026 supplemental financial information
Iron Mountain Incorporated / U.S. SEC · Document date: 2026-08-06 · Primary
https://www.sec.gov/Archives/edgar/data/1020569/000102056926000068/q22026srpfinal.htm
Counterparties and capital
Iron Mountain Data Centers · Developer · CMP-1123
$391,900,000 · 2026-06-30
SEC-reported total expected investment for LON-3 future phases; not a debt financing or current facility valuation.
Iron Mountain Data Centers (Borrower)
Financing record 185; claim-specific source links appear in the exhibit sources where published.
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