PITTSBURG — A United States Steel Corp. unit has bought the Pittsburg property where a steel mill had operated for decades until it ceased operations about two years ago.
The former USS-Posco plant site in Pittsburg has been bought for $275 million by U.S. Steel Property Holdings, according to documents filed on Dec. 29 with the Contra Costa County Recorder’s Office.
U.S. Steel Property Holdings is a real estate unit of U.S. Steel, which itself is owned by Nippon Steel Corp., a Japan-based steel company that took ownership of the iconic steel company in June 2025.
Nippon Steel paid $14.9 billion to buy U.S. Steel and has pledged to accomplish an array of investments that would ramp up steel production in the United States as well as create American jobs.
The just-bought property is in eastern Contra Costa County. Its addresses include 900 Loveridge Road, 750, 900, and 935 East Third St., 3122 Columbia St., and 2907 Antioch-Pittsburg Highway, all in Pittsburg, the county documents show.
U.S. Steel Property Holdings took ownership of the 11 parcels that make up the shuttered steel factory’s sites through a quitclaim deed, the county documents show.
The Pittsburg mill was formerly a 50-50 venture between Pennsylvania-based U.S. Steel and South Korea-based steel company POSCO.
In 2020, U.S. Steel bought out the 50% interest that POSCO-California Corp. had owned in the East Bay factory. The plant produced cold-rolled sheets, galvanized sheets, tinplate and tin-free steel.
U.S. Steel “indefinitely idled” steel production at the UPI plant in Pittsburg in December 2023, according to a post on the company’s website.
In the wake of the Nippon Steel purchase, however, U.S. Steel has announced plans for a big upgrade at an Alabama plant, a restart of a blast furnace at an Illinois plant, and a revamp of a blast furnace at an Indiana plant.
The shutdown of the UPI steel mill in the East Bay erased 474 jobs at the plant. At the time the plant suspended operations, the factory was the only West Coast producer of tin plates for the canning industry, along with other products.
U.S. Steel’s plans for the idled plant weren’t immediately clear. This news organization requested a comment from U.S. Steel regarding the situation.
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