Castroville, not San Antonio: this building goes up at 18844 FM 1957 in Medina County, about 25 miles west of the city it is named for, on a 206-acre campus shared with two earlier Microsoft filings. The Texas registration covers 244,676 sq ft in a single storey holding five data halls, at an estimated $482.6 million with WSP USA as design firm, running from 11 April 2026 to 8 February 2028 - by a wide margin the largest filing on the campus, against $135 million for the first package of its neighbour. Medina Electric Cooperative supplies the power, not San Antonio's municipal utility, and Yancey Water Supply holds the water certificate for the service area. Microsoft redesigned the cooling from evaporative to air after negotiating with that supplier, cutting demand by roughly 85 percent, or about 150,000 gallons a day, in a county drawing on the drought-restricted Edwards Aquifer. Medina County granted a 15-year abatement at 80 percent of property tax. A second Texas filing from December 2025 carries the same SAT82 name at 3580 FM 471 North, for a 195,670 sq ft building at $400 million.
Facility Specifications
Site information
Colocation space
244,676 sq ft
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Frequently asked questions
What address does the Texas filing give?
18844 FM 1957 in Castroville, Medina County, Texas - roughly 25 miles west of San Antonio and outside Bexar County, on a 206-acre campus shared with the SAT80 and SAT81 filings.
How big is the building and what does it cost?
244,676 sq ft over a single storey containing five data halls, at an estimated $482.6 million. WSP USA is the design firm.
Which utility serves the Castroville site?
Medina Electric Cooperative, a rural co-operative. San Antonio's municipal utility does not serve this area. Yancey Water Supply holds the water certificate of convenience and necessity.
How was the water demand reduced?
By redesigning the cooling from evaporative to air after negotiation with the local water supplier, cutting demand by about 85 percent, or roughly 150,000 gallons a day. Medina County draws on the Edwards Aquifer, under drought restrictions for years.
What is the construction schedule?
The registration puts construction from 11 April 2026 to 8 February 2028. A second filing lodged in December 2025 under the same SAT82 name, at 3580 FM 471 North, runs from 13 August 2026 to 24 July 2028 for a 195,670 sq ft building at $400 million.
What tax arrangement applies?
A 15-year abatement of 80 percent of property tax, granted by Medina County.
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