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Data center campus · Former Macy's/Famous-Barr warehouse next to the Armory, Midtown St. Louis, St. Louis (city), Missouri

Armory Innovation District data center

Approved as of April 21, 2026

St. Louis approved a conditional use permit in April 2026 for a 120 MW data center beside the Armory in Midtown, part of a $3 billion district that opponents are challenging in court. Also known as: Armory Innovation Data Center.

Cite← Missouri data centers
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Power120MW reported · stated

Who is behind it

ProjectArmory Innovation District data centerAlso: Armory Innovation Data Center
Developer and teamContour
TeraWatt
THO Investments
Steadfast City
ARCO
End userNot named

The record, newest first

  1. The Board of Aldermen unanimously passed data center zoning rules (Board Bill 49); the Armory project is not covered and is bound instead by similar conditions in its permit. (St. Louis Public Radio, Sept. 11, 2026)

  2. Opponents, including the Eco-Socialist Green Party of Eastern Missouri, filed suit asking a court to reverse the Board of Adjustment's denial of their appeals and to stay the permit; they allege the decision was arbitrary and the process rushed. The city said it does not comment on pending litigation. (St. Louis Public Radio, Aug. 29, 2026; St. Louis Public Radio, Sept. 11, 2026)

  3. The Board of Public Service voted unanimously for the conditional use permit, with conditions on cooling, renewable energy and community benefits. (The St. Louis American, April 21, 2026; The Labor Tribune, April 30, 2026)

  4. A revised plan moved the 120 MW data center to the neighboring Macy's/Famous-Barr warehouse site and would turn the Armory into offices; a zoning hearing was set for March 19. (St. Louis Public Radio, Feb. 25, 2026)

  5. STLPR reported documents showing a roughly $1.5 billion plan to put a data center in the Armory building and its parking lot at 500 Prospect Ave. (St. Louis Public Radio, Sept. 25, 2025)

Conflicts and open questions

  • Lead's 'Building 1' is one building of this campus; recorded as one campus.
  • Developer roster per STLPR and the St. Louis American (which also list the law firm Lewis Rice); the 2025 plan named THO Investments and Simms Building Group, and the Labor Tribune credits local investor Rod Thomas and Las Vegas-based Contour.
  • A proposed citywide data center pause failed to be introduced at the Board of Aldermen (STLPR, Feb. 2026).
  • No ruling in the lawsuit was found in opened sources; the suit's claims are allegations.

The full record

Status note
The Board of Public Service approved the conditional use permit April 21, 2026; the Board of Adjustment denied appeals that summer, and opponents filed suit Aug. 28, 2026 asking a court to reverse that decision.
Evidence
News reports; primary records not yet obtained
Size class
50 MW or more (tracker scope)
Map position approximate, from the reported address or area. Updated Oct. 17, 2026.