SAT89/90 Data Center in Castroville, TX

Microsoft Corporation is developing the SAT89/90 Data Center, a new construction project located at 2995 US HWY 90 W in Castroville, Texas. The facility comprises two single-story buildings, each housing five colos, alongside associated campus site work. The total gross building area is 489,400 square feet, representing a significant industrial footprint in Medina County.

The estimated cost for this development is $765,000,000. This valuation places the project well above the median estimated cost for new construction filings in Medina County, which stands at $1,250,000. The cost per square foot is approximately $1,563, significantly higher than the county median of $200 per square foot. These figures reflect the specialized infrastructure required for data center operations, which is distinct from standard commercial or residential building projects.

Timeline and Status

Construction on the site started in June 2025. The Texas Department of Licensing and Regulation (TDLR) completed the plan review process in February 2026. The project is scheduled to finish in July 2027. This timeline spans approximately 790 days, which is longer than the median scheduled build window of 288 days for similar new construction projects in the county. The extended duration is typical for large-scale data center builds that require complex utility connections and specialized structural work.

WSP USA serves as the design firm of record for the project. The registered accessibility specialist is Jesus E Lardizabal. The project is privately funded and located on private land for private use. Microsoft Corporation has six other TDLR-registered projects, including the SAT82 Data Center in Castroville, which also has a review complete status. This indicates a sustained investment in data infrastructure within the region.

Local Context

The project is situated in ZIP code 78009, where the U.S. Census estimates the population at about 9,494 people. The median household income in this area is $102,724, and the median owner-occupied home value is $335,200. Medina County unemployment was reported at 4.6 percent in August 2026, lower than a year earlier. The development of large-scale facilities like this data center often brings specialized employment opportunities and infrastructure upgrades to the surrounding area, though specific job counts are not detailed in the public filing.