Mill Creek planning commission reviews South Town Center draft, presses on commercial space, parking and stormwater
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Summary
Planning commissioners reviewed a preliminary South Town Center master-plan draft that lays out three alternatives (60–85 ft heights), proposes a central park and a combined stormwater "sponge park," and reduces gross commercial square footage while projecting net fiscal gains; commissioners asked staff to supply missing commercial and stormwater-design specifics and urged stronger North Creek Trail connections.
The City of Mill Creek Planning Commission spent its Jan. 15 study session reviewing an early draft of the South Town Center Master Plan and pressing staff for more data on commercial square footage, parking capacity and stormwater resilience.
Staff framed the presentation as a review of a rough preliminary draft and said the plan responds to four priorities from earlier outreach: pedestrian flow, public gathering spaces and restrooms, retail diversity and preservation of green space and trail connections. The team presented three development alternatives: a baseline that retains current rules (roughly 60-foot height limits), a higher-density option that would allow up to 80–85 feet and require more ground-floor commercial, and a mixed-density middle ground with variable heights between 60 and 85 feet.
Commissioners repeatedly pressed staff on the plan’s economic and infrastructure assumptions. When asked for a current figure for commercial space in the subarea, staff said the town center currently contains about "581,000 square feet" of commercial uses but noted the number includes medical and office uses and that a chart under review suggested a somewhat lower effective commercial total (staff said it could be closer to 530,000–560,000 sq ft depending on classification). "All of these commercial square footages are lower than what exists now," staff said, adding that the alternatives present a smaller gross commercial footprint but a different, higher-value mix of retail that could increase sales-tax yield.
On fiscal effects, staff said preliminary EIS modeling indicates the three alternatives would be net revenue-neutral to positive for the city, with the highest-density option producing the largest tax gains in some scenarios. "When you take into account sales tax and property tax, all three of these alternatives would result in either a slight gain of revenue to the city or quite a large gain up to $1,000,000 a year," staff said, while noting that the full economic analysis will appear in the environmental impact statement.
Design changes in the draft include a broken-up street grid (converting large super-blocks to smaller blocks), an extension of Mill Creek Boulevard/Main Street character through the subarea, and an increase in pedestrian crossings (from six to 18 in the plan maps) to reduce maximum crossing distances. Staff pointed to proposed protected two-way cycle tracks on Main Street and Mill Creek Boulevard, curbless pedestrian streets around the central park and a mix of neighborhood access streets and limited private drives.
Parks and stormwater were a central focus. The plan proposes a Central Park near the existing Safeway/CVS area, a North Gateway Park to better connect Main Street to North Creek Trail, and a "Sponge Park" that would convert an existing, underperforming stormwater pond into a combined regional facility designed to flood during large storms and serve recreation in dry weather. Staff described the Sponge Park as a district-scale detention and treatment facility that improves water quality and reduces peak flows compared with parcel-by-parcel detention.
Commissioners pressed staff on climate resilience of the stormwater design. One commissioner asked whether the detention sizing had been updated to account for climate-change-driven increases in extreme events and asked how a 25-year design compares to more recent storms approaching 100-year intensity. Staff acknowledged they did not have a design-level answer in the meeting and agreed to consult the city engineer and report back.
Several commissioners urged stronger coordination with the regional North Creek Trail. One member said the trail currently dead-ends at the proposed Sponge Park and recommended prioritizing a safe crossing at 164th — possibly a bike-pedestrian bridge — so the trail continues to serve regional users. Another commissioner argued that high-quality bike lanes on Main Street could be redundant if North Creek Trail were upgraded; others countered that on-street cycle infrastructure helps customers reach retail safely. Staff said both approaches could be coordinated and suggested widened sidewalks linking the trail to Main Street where a full trail replacement is not feasible.
Parking and transit constraints also drew attention. Staff said most new parking is expected to be structured (above- or below-grade) and that parts of the subarea lie inside a bus-rapid-transit footprint, which can limit the city’s ability to impose strict parking minimums. Commissioners warned that groceries, medical buildings and event parking could still create high parking demand and asked the team to model high-retail scenarios with housing above.
On financing, staff described a tentative strategy for city-built stormwater infrastructure reimbursed by developers through a latecomer’s agreement, supplemented by impact fees and potential grants. Commissioners asked for a staged "minimum viable" version of the plan in case the full vision is unaffordable, and staff said many of the smaller street connections would likely be constructed incrementally as properties redevelop.
Staff concluded with next steps, noting a volunteer-board workshop scheduled for the 28th to gather design-review, parks and youth-advisory input, and said the full EIS and fiscal analysis will be published for public review. Commissioners recorded no blocking objections and asked staff to return with the requested commercial-square-footage totals, clarification on EIS fiscal assumptions, and a report from the city engineer on stormwater sizing.
Formal actions recorded during the session were limited to approval of minutes from the Nov. 20 meeting and a motion to adjourn; the substantive master-plan discussion was conducted as a study-session hearing with follow-up items assigned to staff.
The planning commission meeting adjourned after the procedural votes; staff said they will bring the requested numeric clarifications and engineer review to a future meeting and to the volunteer-board workshop.
