North Phoenix's Biggest New Neighbor Is Approved, Not Built. Here's What That Means for Stetson Valley.
October 29, 2026
October 29, 2026
North of the Central Arizona Project canal, past the rooftops of Stetson Valley and Sonoran Mountain Ranch, the desert runs north to Loop 303 with almost nothing on it. Across the freeway, TSMC Arizona's fabs rise out of the same ground. On paper, that open stretch between the canal and the freeway is now a planned community of roughly 15,000 homes, with more than 2,000 acres of new preserve at its center.
The plan is called NorthPark, and the Phoenix City Council approved it unanimously on December 17, 2025. For anyone buying in 85083 this fall, the approval answers one question and leaves the bigger one open. It settled what the land may become. It did not settle when, or in what order. The answer to that second question explains why home prices next to the largest private investment in Arizona's history went down this summer instead of up.
The land is still Arizona State Trust land, about 6,354 acres west of I-17 between the CAP canal and Loop 303, as the NorthPark project site describes it. The Arizona State Land Department still owns it. Trust land reaches private builders through public auction, parcel by parcel. While ASLD owns a parcel inside the plan, the NorthPark PUD requires an ASLD Planning Authorization Letter for any development application on it.
So the December vote did not start a construction clock for the whole project. It made each parcel saleable with zoning already in place. ASLD's own FY2026 annual report calls NorthPark's entitlements a "zoning bank," which means flexible approvals that sit ready until someone buys the ground.
The size of that bank has shifted along the way. The 2024 submittal allowed up to 19,247 dwelling units. NorthPark's FAQ says later revisions cut the cap to 15,150. The plan's own introduction also explains why it exists. Its stated purpose is to give TSMC's workforce nearby housing and to replace housing that was "displaced from the area when the TSMC land was developed as employment uses in place of housing."
The first major transaction linked to the rezoning was not for houses. ASLD's annual report credits the NorthPark entitlements with leading to "the successful auction of 902 acres for the planned expansion of TSMC's Arizona campus." The department's auction history records the January 7, 2026 sale of 902.592 acres to TSMC Arizona Corporation for $197.25 million. That was the minimum bid, and it was the only bid. The Arizona Republic covered the purchase the day it happened.
In its first year, then, the rezoning made more room for jobs. ASLD's posted lists of upcoming and coming-soon auctions do not include any parcel identified as NorthPark residential land. NorthPark's materials describe a long development horizon and planned water infrastructure, including an extension of the 54-inch transmission main along the 51st Avenue alignment and, in the future, a storage tank and booster pump station. They give no calendar date for the first homes.
NorthPark has set aside 2,095 acres of natural desert for Phoenix's Sonoran Preserve. The plan says that would grow the existing preserve land in North Phoenix by more than 20%. Section 2.8 of the PUD sets out a staged donation, starting parcel by parcel.
"The process for dedication will be initiated through the preliminary site plan application for properties that have been issued a patent by the Arizona State Land Department and contain lands designated as NOS."
Read as a sequence, the path from today's open desert to public trails looks like this:
The preserve comes with development, not ahead of it. In practice, the land north of the canal is likely to stay just as it looks today until a builder buys a piece of it. Expanded public access and new rooftops then arrive together, one parcel at a time. The PUD also takes all residential uses off the land set aside for the preserve. That gives a Stetson Valley owner a clearer picture of which acres will stay open, even if it does not say when.
If the market were pricing NorthPark and TSMC as done deals, the ZIP codes closest to the campus would show it. Instead, the ARMLS third-quarter 2026 summary, prepared October 6, shows them softening, while a ZIP farther southeast held steady.
| ZIP, Q3 2026 | Median sale price | 1-yr change | Median days on market | Closed sales, 1-yr change |
|---|---|---|---|---|
| 85083, Stetson Valley | $563,000 | -13.4% | 72 | +9.8% |
| 85085, Norterra and Sonoran Foothills | $624,500 | -2.6% | 104 | +8.1% |
| 85086, Anthem and New River | $609,000 | -10.4% | 108 | 0.0% |
| 85050 | $627,500 | +2.9% | 85 | -4.7% |
Look at 85083 first. During July through September 2026, the median fell 13.4% from a year earlier, while the number of closed sales rose 9.8%. More homes changed hands at lower prices. That is not what happens when buyers compete to get close to a new employer. Sellers there received 94.8% of list price on average. In 85085, homes took a median of 104 days to sell, 13% longer than a year before.
The wider Valley gives some context. ARMLS's September 2026 report puts the market-wide median at $450,000, with 63 median days on market and 4.45 months of supply. No published analysis measures how much of North Phoenix's softness comes from TSMC, from the broader market, or from which homes happened to sell. The data does show no premium for being near the fab as of the third quarter of 2026.
The fab itself is still ramping up. TSMC says Fab 1 has been in high-volume production since the fourth quarter of 2024 and that its Arizona operation has more than 3,500 employees. It expects the first three fabs to support 6,000 direct high-tech jobs. In its October 15 earnings call, as Metro Phoenix reported, the company put Fab 2's volume production in the third quarter of 2027. The City of Phoenix announced on July 16, 2026 that TSMC would invest another $100 billion in four more fabs, bringing planned investment to $265 billion.
Next door, the 2,300-acre Halo Vista development around the campus is starting with industry. The Arizona Republic reported in August that construction on industrial buildings would begin in late 2026.
Each piece follows the same order: jobs and industrial space first, homes later, and new preserve land only once those homes are site-planned.
The PUD allows residential development on the State Trust land between the CAP canal and Loop 303, which borders Stetson Valley and Sonoran Mountain Ranch. Exact locations depend on the parcel plans in the stamped PUD narrative and on which parcels the state sells, and when.
The plan ties dedication to each parcel's patent and preliminary site plan. It does not give a date. Watch ASLD's auction notices; they will be the first public sign that the timeline has started.
ASLD sold 902 acres to TSMC in January 2026. It also recorded two Phoenix-area sales to Dove Valley Phoenix, LLC on June 26, 2026, at $45 million and $43 million, but those records do not identify the parcels as NorthPark land.
This post explains public land-use rules and approvals for general information only. It is not legal or financial advice, so please confirm how any parcel or plan affects your purchase with the right professional.
Whether you are relocating to support the TSMC build-out or weighing a move-up purchase in 85083 or 85085, Allison Cahill can go through the NorthPark entitlement documents, ASLD's auction record and current pricing with you before you write an offer. Schedule a confidential consultation.
Detail-oriented, Cahill has a passion for studying the market and educating clients about current conditions, inventory and trends. “I take my time with each client and listen to what they want,” she says. “My sellers like that I truly market their properties on all social media platforms and print publications, with the use of not only photography, but also video, drone and 3D-style tours of their homes.”