Dallas-based data center operator CyrusOne is lining up a roughly $500 million, one-story complex just outside Castroville, with state records putting the building at about 460,000 square feet and targeting completion by June 1, 2027. If it proceeds as filed, the project will push the company’s footprint farther west of San Antonio and add to a growing cluster of hyperscale campuses in Medina and West Bexar counties. Neighbors and officials are already eyeing what it could mean for power, fiber, traffic and local tax deals.
What CyrusOne Is Building
According to a project filing with the Texas Department of Licensing and Regulation, the registration lists CyrusOne LP as the owner, puts the site at 3397 U.S. 90 West and estimates a project cost of $500,000,000. The plan calls for a 460,000-square-foot, one-story insulated precast building, with a projected finish date of June 1, 2027. The filing identifies the development as project SAT14A and names design firm Corgan, along with a registered accessibility specialist on the record.
Land, Zone And Tax Breaks
Medina County documents show CyrusOne has picked out roughly 244 acres inside a newly created "CyrusOne Reinvestment Zone 1" and has applied for a Chapter 312 tax abatement agreement tied to data center improvements, according to the county’s meeting packet. Public materials include maps, legal descriptions and an outline of the expected improvements and estimated costs tied to the site.
CyrusOne's Texas Footprint
According to CyrusOne, the company operates numerous Texas facilities and more than 60 data centers worldwide, and the Castroville project would further expand its regional holdings. The firm already lists San Antonio among its Texas markets, which helps explain why it is staying active in the area.
Neighbors And Infrastructure
TDLR records show Microsoft is putting up multiple large data center buildings nearby, including a two-building campus at 2995 U.S. 90 West and additional projects at 18844 FM 1957. Together, those developments account for hundreds of thousands of square feet and hundreds of millions of dollars in investment. The concentration of campuses has been driven by access to power and fiber and by buildable, flat land, as reported by the San Antonio Express-News, which also notes that CyrusOne declined to comment ahead of publication.
What Locals Will Watch Next
County leaders and utility providers are expected to scrutinize any incentive terms and infrastructure demands as site work moves forward, while nearby residents wait for more detail on traffic, water use and construction timelines. The project is now in state records, and contractors, permits and any public hearings are likely to follow as plans are finalized.
