TSMC’s plans to expand north Phoenix campus could encompass 3 square miles

Article originally posted on AZ Central on September 17, 2025

Taiwan Semiconductor Manufacturing Co.’s plans to expand in north Phoenix could give the technology giant a footprint of more than three square miles.

The chipmaker signed on to a zoning application for 6,400 acres of land south of Loop 303 at Interstate 17, directly south of where the company is already building its massive campus. TSMC would specifically be eyeing the roughly 900-acre “innovation corridor” in the proposed rezoning area.

The application, which was filed by PulteGroup in late 2024, requests that Phoenix allow a slew of building types on the site. If approved, it would allow more than 15,000 new housing units, including single-family homes and apartments, small- and large-scale retail, restaurants, commercial services, business parks, office and about 2,100 acres of preserved open space.

The development is called NorthPark.

TSMC is now collaborating with PulteGroup on NorthPark, Chris Dotts, a spokesperson for TSMC said.

“The now $165 billion includes a total of six chip fabs, two advanced packaging facilities and a research and development center – all in the state of Arizona,” she said in an email. “This investment will bring billions of dollars in economic benefit to the state of Arizona and bolster American semiconductor technology leadership. Additional land is required to support this expansion. When evaluating locations, we considered the proximity to our current campus; the availability of a contiguous plot of land; and access to a utilities infrastructure.”

All the land included in the NorthPark rezoning application is controlled by the Arizona State Land Department. State land must be sold to the highest bidder at a public auction, so if TSMC wants to buy the land, it would need to successfully bid on it. So far, no auctions have been scheduled for the site.

TSMC would likely only buy the 900-acre innovation corridor, not the entire site.

PulteGroup, the other applicant, could choose to buy the remainder of the land, or a portion of it, to develop the housing and mixed-use components of the proposal.

The process is similar to how the company acquired its original, roughly 1,100-acre site. The land was part of a larger rezoning, totaling about 3,500 acres.

The remainder of that land was later bought by a partnership between Mack Real Estate Group and McCourt Partners. It has since been renamed Halo Vista, and is in the early stages of planning, and could eventually contain up to 30 million square feet of new development.

TSMC and the greater master plans around it, Halo Vista and NorthPark, now stretch about 9,900 acres, or about 15.5 square miles. Combined, the two sites are larger than the town of Paradise Valley.

So far, plans for two “sub-areas” of the Halo Vista development, named the Forge and Sonoran Oasis Science and Technology Park, have been announced.

The Forge is expected to have about 12 million square feet of industrial buildings and the Sonoran Oasis Science and Technology Park will have about 3.5 million square feet of flexible office and technology space.

Future phases will include apartments and retail, which will likely be closer to I-17. Plans also include an auto mall that could have about 10 dealerships.