After Oct. 14: the 5-Acre Site calendar owners near Kearns should watch

If you’ve spent the summer watching cones and lane shifts on Kearns, you’re not alone. By mid-October a lot of owners near Prospector Square and Bonanza are asking the same kitchen-table question: is the heavy work done — or are we just changing calendars?

This isn’t a neighborhood tour. It’s a dated wrap of three tracks that actually move the ground under you: the Prospector Square infrastructure finale, Rocky Mountain Power’s undergrounding phases, and the city’s Five-Acre Site entitlement calendar after the Oct. 14 Planning Commission hearing. Read the dates as published — and treat anything still labeled “anticipated” as contingent.

Park City winter aerial — Bonanza and Prospector sit in the in-town fabric where owners watch construction calendars. Photo: Everwest, Wikimedia Commons, CC BY 4.0.

What Prospector already finished

Start with the piece that local coverage already framed as late-stage. In June 2026, TownLift reported that the Prospector Square Property Owners Association was wrapping a multi-year commercial-district project — sewer lines, parking lots, walkways, and lighting — with more than $3 million invested since 2018.

The final manhole, per PSPOA via that coverage, completed the swap from aging 6-inch sewer lines to 8-inch. Lot I paving closures were scheduled for June 13 and June 20 (weather permitting), with additional asphalt maintenance planned later that summer on Lot K and Lot A / the “7-Eleven lot.” Lot I paving was described as one of the final major modernization steps.

For an Oct. 19 read, treat that program as largely behind owners — not as a blank check that every punch-list item is closed. Confirm remaining notices with PSPOA or current city construction alerts before you plan a closing week around “fully done.”

Phase I vs. Phase II undergrounding

Separately, Park City Municipal and Rocky Mountain Power began Phase I of Bonanza Park transmission-line undergrounding on April 7, 2026, after City Council approval in 2024. Park Record’s April coverage of the city release laid out the sequence: spring lane reductions and detours on Kearns Boulevard, work toward Woodbine Way in July, and substation work in August–September. TownLift tracked the Kearns detours as the season opened.

Two dates matter more than the summer noise:

Phase I was targeted to complete in October 2026 — moving high-voltage lines that run overhead through Bonanza Park underground.

Phase II — bringing those underground lines into service and removing towers and overhead lines — was expected in late spring 2027.

The city has pointed to practical effects of that work: more cemetery plots, reduced wildfire risk from overhead lines, clearing towers from a view corridor, and eliminating a 60-foot aerial restriction that limited redevelopment options on the Bonanza Park 5-Acre Site. Business access, including Snow Creek, was to remain open during the work.

If you’re reading this in mid-October, re-check the city’s current construction / transmission undergrounding pages for whether Phase I actually hit its October mark — this draft does not invent a completion date. Phase I finish and Phase II energize-and-remove are related — not the same milestone.

Illustrative infrastructure work — season wraps and spring starts, not a photo of the 5-Acre Site. Photo: Etienne Girardet, Unsplash License.

What Oct. 14 actually did — check the minutes

The city owns the 5-Acre Site at the southwest corner of Kearns Boulevard and Bonanza Drive. On March 19, 2026, City Council directed partner Brinshore Development to submit Planning Commission applications for mixed-use redevelopment. The published program includes 106 residential units (88 deed-restricted affordable), 32,581 square feet of commercial space, community green space, public art space, a child care center, and an underground parking garage — per the city’s Five-Acre Site land-use page.

Applications went in May 4–5, 2026 (MPD PL-26-06914; Subdivision PL-26-06920; CUPs PL-26-06915 / PL-26-06917). Hearings and work sessions followed through the summer; Wednesday October 14, 2026 was noticed for a public hearing and possible final action at 5:30 p.m. in Council Chambers. TownLift’s August piece framed that October date the same way. As of this Editor pass (Sep 15, 2026 CT), the city page still lists Oct. 14 as upcoming — no motion is invented here.

Nearer publish (required): By the week of Oct. 19 that hearing will have happened — or been continued. Pull the Planning Commission minutes and re-open the city’s Five-Acre page for whether the commission took final action, added conditions, or set another date. Update this section with the real outcome before CMS paste. Comments still route to planning@parkcity.gov when the city asks for them.

Live 5-Acre dates (still contingent)

Whether or not Oct. 14 closed the land-use chapter, the project calendar on 5acresite.com — and how Park Record’s June 30 timeline wrap summarized it — is the sheet owners near Kearns and Bonanza should keep on the fridge. Partnership framing there: Park City Municipal, GTS, and Brinshore. Headline metrics on the site include 5.27 acres, 60% open space, nearly 2 acres of village green, 106 lower-density rental units (88 affordable), 280 underground parking spaces, multi-use trails, and transit lanes / bus stops.

Published timeline entries (approval-dependent; reconfirm on 5acresite.com nearer publish):

• November 2026 — Pre-Development Agreement; begin construction documents (the live site also lists powerline undergrounding among related late-2026 milestones — don’t merge that language with the city’s October Phase I target; they’re related, not identical clocks)
• December 2026 — building-permit / financing steps appear in the mid-2026 Park Record summary of the project timeline as anticipated next paper after Nov PDA/CDs; treat as contingent coverage of the partner calendar, not a city-guaranteed filing date — reconfirm on 5acresite.com / city materials nearer publish
• December 2027 — begin construction (projected on the live site)
• Winter 2029 — grand opening anticipated

Skip older November 2025 coverage that floated an April/May 2027 construction start — that draft timeline is superseded by the mid-2026 site calendar. And don’t treat December 2027 as guaranteed. It’s a published flag on a contingent path.

Regional transit context — 5-Acre materials emphasize transit lanes and bus stops as part of the Bonanza plan (illustrative, not the site). Photo: Maylingoed, Wikimedia Commons, CC BY-SA 4.0.

Using the calendar for closing timing — not hype

Here’s the ownership diligence version, without neighborhood brochure language:

If you’re under contract or already own near Prospector Square, ask what’s left on the PSPOA punch list and whether any lot closures still show up on association or city notices. For Bonanza / Kearns addresses, separate “Phase I trenches largely done” from “Phase II towers come down in late spring 2027.” For the Five-Acre corner, separate entitlement action from PDA / CD / permit steps and from a projected December 2027 groundbreaking.

Closing weeks and inspection windows are property-specific. Match them to known work windows — don’t build a sale-price story off the calendar alone. Published program numbers (unit counts, commercial square footage, parking) are useful context; who “belongs” in Bonanza Park or Prospector is not a conversation this post will have.

Final takeaway

By late October you’re looking at three clocks, not one vibe: Prospector’s multi-year infrastructure wrap largely in the rearview, Phase I undergrounding at its October target with Phase II still ahead for late spring 2027, and a Five-Acre Site path that runs from the Oct. 14 hearing through contingent Nov–Dec 2026 paper milestones toward a projected December 2027 start. Check the city’s pages and 5acresite.com — and the Oct. 14 minutes — before you treat any of those as settled.

If you want help mapping Prospector / Bonanza construction and entitlement timing against a specific property or closing date, I’m glad to walk through the calendar with you.

Talk with Esteban J. Nunez — Park City Realtor.