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Microsoft Castroville campus (SAT80, SAT81, SAT82)

Microsoft

Status
SAT80–81 construction complete (TDLR); SAT82 registered (TDLR)
Developer / parties
Microsoft
Location
Castroville (18844 FM 1957 / Potranco Rd), Medina County
Size
SAT80 and SAT81: 106,012 sq ft each (admin building, Colo 1 finish-out, Colo 2 shell); SAT82: one-story, 5 colos, 244,676 sq ft (Jul 2024 filing at 18844 FM 1957). A Dec 2025 filing also named SAT82 lists 3580 FM 471 N, Castroville, 1-story 5-colo, 195,670 sq ft (TDLR TABS)
Investment
Est. cost SAT80 $135M, SAT81 $95M (TDLR TABS; Devine News puts the FM 1957 data center at $230M); SAT82 est. $482.6M (Jul 2024 filing) and $400M (Dec 2025 filing at 3580 FM 471 N) (TDLR TABS)
Reported benefits
Microsoft funds a county fire inspection program under a Chapter 381 agreement (minutes; agenda summary)
Last verified
2026-10-06

Milestones

Figures are attributed in parentheses to the outlet or company that reported them. Where sources disagree, we show both.

  1. Jul 28 2022 SAT80 and SAT81 construction start
  2. Jul 26 2023 SAT80 and SAT81 registered with TDLR
  3. May 13 2024 Commissioners Court approved 4-0 a Chapter 381 economic development agreement with Microsoft for a county fire inspection program (minutes)
  4. agenda summary: Microsoft contributes $100,000 for fire inspection of the data centers, 3-year term
  5. Devine News: $100,000 a year for inspections at the FM 1957 data center
  6. Jul 25 2024 SAT82 registered at 18844 FM 1957 (start Apr 11 2026, completion Feb 8 2028; status Review Complete)
  7. Aug 31 2024 SAT80 and Sep 30 2024 SAT81 completion dates, both TDLR status Inspection Complete
  8. Dec 17 2025 a second TDLR registration named Microsoft SAT82 at 3580 FM 471 N (start Aug 13 2026, completion Jul 24 2028; Project Registered)
  9. relation between the two SAT82 filings not stated. No TDLR registrations found for SAT83, SAT84 or SAT85 (TDLR search, Oct 6 2026)

Related records

2025-12-17
Building registration (TDLR) Official record Medina County · Microsoft Castroville campus (SAT80, SAT81, SAT82)

TDLR TABS: 'Microsoft SAT82 Data Center' at 3580 FM 471 N, Castroville; 5 colos, 195,670 sq ft, $400M; start Aug 13 2026.

Source: tdlr.texas.gov ↗
2024-07-25
Building registration (TDLR) Official record Medina County · Microsoft Castroville campus (SAT80, SAT81, SAT82)

TDLR TABS: Microsoft SAT82, 18844 FM 1957; 5 colos, 244,676 sq ft, $482.6M; start Apr 11 2026, completion Feb 8 2028.

Source: tdlr.texas.gov ↗
2024-05-13
Commissioners court Official record Medina County · Microsoft Castroville campus (SAT80, SAT81, SAT82)

Minutes: court approves 4-0 a Chapter 381 agreement with Microsoft for a fire inspection program; agenda: $100,000, 3-year term.

Source: public.destinyhosted.com ↗
2023-07-26
Building registration (TDLR) Official record Medina County · Microsoft Castroville campus (SAT80, SAT81, SAT82)

TDLR TABS: Microsoft SAT80, 18844 FM 1957, Castroville; 106,012 sq ft, $135M; completed Aug 31 2024 (Inspection Complete).

Source: tdlr.texas.gov ↗
2023-07-26
Building registration (TDLR) Official record Medina County · Microsoft Castroville campus (SAT80, SAT81, SAT82)

TDLR TABS: Microsoft SAT81, 18844 FM 1957, Castroville; 106,012 sq ft, $95M; completed Sep 30 2024 (Inspection Complete).

Source: tdlr.texas.gov ↗

Sources

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