Data center profile · 3728 Market Street, Midtown St. Louis, Missouri

Armory Innovation District Data Center (St. Louis)

TeraWatt Infrastructure's 120 MW, 525,000 sq ft Midtown St. Louis data center: conditional use permit granted April 2026, in lawsuits by residents and the developer.

Permit granted, in litigation. The city's Board of Public Service unanimously granted a conditional use permit on Apr. 21, 2026, and the Board of Adjustment denied residents' appeals after a long July hearing. Residents sued on Aug. 28, 2026 and TeraWatt then sued the city over two permit conditions.
120 MW
campus capacity, as stated (press)
not split into IT and utility load
$3.1B
proposed Armory Innovation District (press)
the data center anchors a wider district
$432.3M
tax revenue expected over 10 years
city estimate; no local tax abatement sought
Q4 2028
fully operational, per the benefits agreement term sheet
press reports a later construction window of Aug. 2027 to late 2029
OperatorTeraWatt Infrastructure and co-developers (press)
CustomerNot disclosed
Planned IT capacity96 MW at full build-out (our estimate from the company's 120 MW campus power figure)
First building in serviceOur estimate: 2028 (range 2027 to 2030); company says 2029.
Next deadlineAug. 2027: Construction start if development proceeds on schedule (press); court rulings pending
Power

Power and the grid

Sources on record, size not disclosed

Getting on the grid

Permits

Permits checklist

1 denied · 1 contested · 2 granted

Approvals a campus like this normally needs, and what we found.

Risks

What could slow it down

Lawsuits

2 cases on record

Money

Money on record

$15.75M
local investments required by the benefits agreement (press)
the city term sheet puts the contribution at $30 per sq ft, about $15 million News report · Oct. 2026
$432.3M
tax revenue expected over 10 years
developer pays $15,000 in damages per $100,000 below projections after 2029 Local government · April 2026
Timeline

What happened, and what is due

SitePaper trailConstructionPowerPermitsMoneyLegalUpcoming
  1. Feb. 13, 2026
    Legal Board of Aldermen votes down a one-year data center permit moratorium bill News report · Feb. 2026
  2. April 21, 2026
    Permits Board of Public Service unanimously approves the conditional use permit, with a community benefits agreement Local government · April 2026
  3. July 29, 2026
    Permits Board of Adjustment denies residents' appeals after roughly 11 hours of public comment News report · April 2026
  4. Aug. 28, 2026
    Legal Residents and groups sue the city and board over the permit News report · Aug. 2026
  5. Sept. 11, 2026
    Permits Board of Aldermen adopts citywide data center zoning rules; the Armory project is exempt News report · Sept. 2026
  6. Oct. 17, 2026
    Legal TeraWatt sues the city over two Board of Adjustment conditions, including a 2.4 MW renewable requirement (press) News report · Oct. 2026
  7. Aug. 2027
    Construction Construction expected to begin if development proceeds on schedule (press) News report · Oct. 2026
The buildings

Specs

525,000 sq ft
hyperscale facility in the former Goodwill outlet building (press)
News report · Oct. 2026
51 generators
diesel backup units, emergency power only
News report · Aug. 2026
PUE 1.25
or better, required by permit conditions
Local government · April 2026
Who is involved

Owners, partners and builders

Developers (press)
  • TeraWatt Infrastructure: co-developer
  • Contour, THO Investments, Steadfast City, ARCO and Lewis Rice: named among the developers
  • David Lambiaso: developer named in the residents' suit
Decision-makers
  • St. Louis Board of Public Service: granted the permit
  • St. Louis Board of Adjustment: heard the appeals
  • St. Louis Board of Aldermen: zoning rules
Power
  • Ameren Missouri: serving utility under its large-load plan
Still unknown

Open questions

Where this comes from

75 records from 20 documents

Drawn from news reports, utility regulator dockets, local government records and company statements, each kept with its date and source. The bar shows documents by type.

News report 11Utility regulator 4Local government 3Company 2
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 (5)
  • Stated campus size: 120 MW
    “The most visible and controversial of the projects in the pipeline is the 120-megawatt, 525,000-square-foot hyperscale facility slated for Midtown St. Louis.”
    News report · Oct. 2026 · grade C
  • Armory is exempt from Board Bill 49 and continues under its earlier permit conditions incl. closed-loop cooling and at least 50% renewable electricity within five years
    “The already-approved 120MW Armory project is exempt and will continue under conditions agreed through the earlier permitting process”
    News report · Sept. 2026 · grade C
  • 51 semi-truck-sized diesel backup generators, tested at least monthly, per hearing coverage; city conditions restrict testing to 10am-12pm and 2-5pm Mon-Fri and ban testing on bad air quality days
    “Fifty-one semi-truck-sized diesel generators would provide emergency power – and would be tested at least monthly.”
    News report · Aug. 2026 · grade C
  • Queue MW 120 VERIFIED as the campus figure in multiple sources: 120 MW hyperscale, 525,000 sq ft at 3728 Market Street; basis is campus stated total, not split into IT vs utility in sources retrieved
    “to allow a 120-Megawatt hyperscale data center to go into the Goodwill Outlet Building at 3728 Market Street”
    News report · July 2026 · grade C
  • The campus's city conditional use approval (Apr 21, 2026, Board of Public Service) carries energy conditions that survive the city's later Board Bill 49 data-center ordinance (Sep 11, 2026), from which Armory is exempt:
    “The already-approved 120MW Armory project is exempt and will continue under conditions agreed through the earlier permitting process... a requirement to source at least half of its electricity from renewable sources within five years”
    News report · April 2026 · grade C
Money and contracts (9)
  • Community Benefits Agreement (term sheet) - community contribution: community contribution Community Benefits Agreement (term sheet negotiated with conditional use permit): Contribute $30 per sq ft of approved data cente
    “Contribute $30 per square foot of approved data center development, an estimated $15 million to a City fund for the use on:”
    Local government · April 2026 · grade B
  • Community Benefits Agreement (term sheet) - no-abatement clause: no tax abatement Community Benefits Agreement (term sheet): Developer will not seek local tax abatement incentives for the data center or Armory buildings
    “Not seek local tax abatement incentives for the data center or Armory buildings.”
    Local government · April 2026 · grade B
  • Community Benefits Agreement (term sheet) - liquidated damages (tax shortfall): liquidated damages tax shortfall Community Benefits Agreement (term sheet): $15,000 liquidated damages for every $100,000 below projected an
    “Confirm tax revenue estimates and pay $15,000 in liquidated damages for every $100,000 below the projected annual tax revenues if not met by 2029.”
    Local government · April 2026 · grade B
  • Community Benefits Agreement (term sheet) - job floor: job floor Community Benefits Agreement (term sheet): Escalating median-wage job minimums for 20 years: 25 in year 1, 50 in year 2, 100 thereafter; $2,000 liquidated
    “Meet escalating, median-wage "Job" minimums for 20 years (starting at 25 in year 1, 50 in year 2, and 100 thereafter)”
    Local government · April 2026 · grade B
  • Community Benefits Agreement (term sheet) - performance schedule: performance schedule Community Benefits Agreement (term sheet): Data center completely operational by end of Q4 2028; decommissioning plan required if vac
    “Establishes a performance schedule, with the data center completely operational by the end of quarter four of 2028.”
    Local government · April 2026 · grade B
  • Community Benefits Agreement: local investment commitment 15.75 USD million
    “the city has approved a conditional use permit and community benefits agreement requiring $15.75 million in local investments.”
    News report · Oct. 2026 · grade C
  • Community benefits agreement requires $15.75M in local investments; project is barred from tax abatements and projects $432M tax revenue in its first decade
    “the city has approved a conditional use permit and community benefits agreement requiring $15.75 million in local investments.”
    News report · Oct. 2026 · grade C
  • Community Benefits Agreement: no tax abatement / liquidated damages
    “pay significant liquidated damages in the event the data center fails to meet projected tax revenue and not seek local tax abatement incentives for the development”
    News report · Aug. 2026 · grade C
  • Project Labor Agreement (ARCO Construction): labor Project Labor Agreement (reported): ARCO Construction signed a Project Labor Agreement on the development; project described as 100% union
    “ARCO Construction has signed a Project Labor Agreement on the development.”
    News report · Feb. 2026 · grade C
Permits and government (20)
  • The third Missouri IOU followed the same SB 4 path: Liberty filed its Transmissi: Liberty Utilities (Empire District) large load rate plan filed Sept. 11, 2026 - SB 4 pattern case
    “On September 11, 2026, Liberty filed an application and supporting testimony with the Commission providing its proposal for a Transmission Service Large Load (TS-LL) tariff”
    Utility regulator · Sept. 2026 · grade A
  • Under Senate Bill 4 (2025), the PSC approved Ameren Missouri's amended Large Loa: Ameren Missouri Large Load Customer Rate Plan (Schedule LLPS) approved Nov. 24, 2025; tariff sheets effective Jan. 4, 2026
    “Large-load customers must take service for a minimum of 12 years, with the option of taking an additional 5 years as a "ramp up" period”
    Utility regulator · Nov. 2025 · grade A
  • St. Louis Board of Aldermen:
    “Sponsored by 1st Ward Alderwoman Anne Schweitzer and passed unanimously by the Board of Aldermen (BoA), the landmark legislation updates the municipal Zoning Code”
    Local government · Sept. 2026 · grade B
  • County code: 29510
    “contesting the Board Public Service decision to issue a conditional use permit, authorizing David Lambiaso to construct a data center, per plans (zoning only), at 3728-46 Market St. and 3854-58 Market St.”
    Local government · July 2026 · grade B
  • Site address: 3728-46 Market St. and 3854-58 Market St., St. Louis, MO (Ward 11)
    “contesting the Board Public Service decision to issue a conditional use permit, authorizing David Lambiaso to construct a data center, per plans (zoning only), at 3728-46 Market St. and 3854-58 Market St.”
    Local government · July 2026 · grade B
  • St. Louis Board of Public Service:
    “Today, the City of St. Louis Board of Public Service unanimously approved a conditional use permit for the construction of a data center at the old Famous-Barr warehouse property.”
    Local government · April 2026 · grade B
  • The framework under which the 120 MW Armory data center would take Ameren Missou: Order approving Ameren Missouri's large load rate plan ('Powering Missouri Growth Plan') and associated variance - issued Nov 24, 2025; in
    “In November 2025, the Missouri Public Service Commission approved Ameren Missouri’s Powering Missouri Growth Plan”
    Company · Nov. 2025 · grade B
  • New rules set buffer zones, noise limits and renewable requirements for future d: citywide data-center zoning rules adopted; Armory exempt
    “The already-approved 120MW Armory project is exempt and will continue under conditions agreed through the earlier permitting process”
    News report · Sept. 2026 · grade C
  • Board Bill 49 (Sep 11, 2026) created citywide data-center zoning rules; the already-approved Armory project is exempt and keeps its negotiated conditions (closed-loop cooling, >=50% renewable within five years)
    “The already-approved 120MW Armory project is exempt and will continue under conditions agreed through the earlier permitting process”
    News report · Sept. 2026 · grade C
  • Board Bill 49 (Sep 2026) created citywide data-center zoning rules for future projects; the already-approved Armory project is exempt and keeps its negotiated CUP conditions.
    “The already-approved 120MW Armory project is exempt and will continue under conditions agreed through the earlier permitting process”
    News report · Sept. 2026 · grade C
  • Conditional Use Permit: Appeals rejected; CUP upheld with added conditions
    “the board rejected the appeals challenging the conditional use permit and approved the permit for the Armory site data center”
    News report · July 2026 · grade C
  • St. Louis Board of Adjustment:
    “Thirteen appellants had filed to challenge the decision by another board, the Board of Public Service. who granted a Conditional Use Permit to allow a 120-Megawatt hyperscale data center”
    News report · July 2026 · grade C
  • St. Louis Planning Commission:
    “on June 10, 2026, the city's Planning Commission voted to recommend approval of the regulations to the Board of Alderman for a final vote”
    News report · June 2026 · grade C
  • Developer: TeraWatt Infrastructure (co-developer, consortium incl. Contour, THO Investments, Steadfast City, ARCO, Lewis Rice); permit applicant David Lambiaso
    “The 120-megawatt facility, developed by a consortium including Contour, TeraWatt, THO Investments, Steadfast City, ARCO, and Lewis Rice”
    News report · April 2026 · grade C
  • Project status: approved
    “The Armory Innovation Data Center received conditional use permit approval on April 21, 2026”
    News report · April 2026 · grade C
  • Announced: April 21, 2026
    “On April 21, city officials unanimously approved a conditional use permit for the construction of a data center at an old warehouse commonly known to city residents as “The Armory”.”
    News report · April 2026 · grade C
  • CUP for 120 MW hyperscale data center in the Goodwill Outlet Building at 3728 Ma: conditional use permit granted; appeals denied
    “Board of Adjustment denial of appeals and grant of a conditional use permit, after roughly 11 hours of public comment”
    News report · April 2026 · grade C
  • Conditional Use Permit: Granted (unanimous)
    “On April 21, city officials unanimously approved a conditional use permit for the construction of a data center at an old warehouse commonly known to city residents as “The Armory”.”
    News report · April 2026 · grade C
  • Conditional use approved April 21, 2026 (Board of Public Service / Board of Adjustment process) with infrastructure and community conditions
    “The Armory Innovation Data Center received conditional use permit approval on April 21, 2026 via a virtual, last-second vote by the Board of Public Service.”
    News report · April 2026 · grade C
  • St. Louis Board of Aldermen:
    “on February 13, the St. Louis City's Board of Alderman voted down Board Bill 172, which would have placed a oneyear moratorium on the issuance of data center permits in the city”
    News report · Feb. 2026 · grade C
Legal (6)
  • Project status: entitled only - CUP granted and upheld on appeal; construction not scheduled until Aug 2027; litigation pending (at risk)
    “If development proceeds on schedule, construction will get underway in August 2027 and conclude by late 2029.”
    News report · Oct. 2026 · grade C
  • Weeks after the opponents suit, TeraWatt sued the City challenging two Board of Adjustment conditions as illegal and beyond board authority, incl. 2.4 MW on-site renewable requirement called practically impossible on the
    “forcing the data center to use 2.4 MWs of renewable energy would be “practically impossible” on the 11-acre site.”
    News report · Oct. 2026 · grade C
  • Opponents sued over the permit (health/environmental review); TeraWatt then sued the city challenging Board of Adjustment conditions including the renewable-energy requirement
    “Opponents have sued over the project's permit, citing insufficient consideration of health and environmental risks. TeraWatt subsequently sued the city”
    News report · Oct. 2026 · grade C
  • Developer lawsuit filed Sep 2026: TeraWatt (per partner David Lambiaso) sued the City of St; Louis challenging two Board of Adjustment conditions as illegal and beyond the board's authority, including the 2.4 MW renewabl
    “According to the lawsuit, forcing the data center to use 2.4 MWs of renewable energy would be “practically impossible” on the 11-acre site.”
    News report · Oct. 2026 · grade C
  • Residents incl. Daniel Pate and Kerry McCullen with Missouri Workers Center and Missouri Coalition for the Environment sued Aug 28 2026 seeking stay and reversal, alleging the Board of Adjustment acted contrary to law an
    “filed suit on August 28, 2026 against the City of St. Louis, the members of its Board of Adjustment, and developer David Lambiaso over the conditional use permit”
    News report · Aug. 2026 · grade C
  • Opponent lawsuit filed Aug 28, 2026 (residents Daniel Pate and Kerry McCullen, Missouri Workers' Center, Missouri Coalition for the Environment) against the City of St. Louis, Board of Adjustment members and developer Da
    “Residents including Daniel Pate and Kerry McCullen, together with the Missouri Workers' Center and the Missouri Coalition for the Environment, filed suit on August 28, 2026”
    News report · Aug. 2026 · grade C
Site and other (2)
  • Floor area: 525000 sq ft
    “The most visible and controversial of the projects in the pipeline is the 120-megawatt, 525,000-square-foot hyperscale facility slated for Midtown St. Louis.”
    News report · Oct. 2026 · grade C
  • Press reports construction underway Aug 2027 to late 2029 if on schedule - CONFLICTS with the CBA term sheet requiring fully operational by end Q4 2028
    “If development proceeds on schedule, construction will get underway in August 2027 and conclude by late 2029.”
    News report · Oct. 2026 · grade C