New Trier Township Property Tax Appeal: 26% BOR Win Rate, 14.1% Avg Reduction

New Trier Township commercial property owners have appealed their assessments at the Cook County Board of Review with a 26% historical win rate and an average reduction of 14.1% when the BOR grants relief. New Trier sits in the north/northwest suburban triad, which was reassessed in 2025. Owners who received their 2025 reassessment notice and are evaluating whether to file at the Board of Review can use this data to set realistic expectations.

This post summarizes Cook County BOR appeal outcomes for New Trier Township across all major commercial property categories, draws out what the data means for current and prospective filers, and links to property-type-specific analysis pages with the underlying case data.

Communities in New Trier Township

New Trier Township covers Wilmette, Winnetka, Glencoe, and Kenilworth (the four North Shore villages).

New Trier Township covers the four affluent North Shore villages immediately north of Evanston along Lake Michigan. Commercial property is limited but high-quality, concentrated in walkable downtown business districts (downtown Wilmette around Linden Avenue, downtown Winnetka along Elm Street, downtown Glencoe along Vernon Avenue) and along the Green Bay Road corridor. Retail, restaurants, and small professional offices make up most of the commercial base; industrial property is essentially absent.

What Makes New Trier Distinctive

New Trier has the smallest qualifying property base in the north/northwest triad, but its commercial properties trade at premium per-square-foot values that can drift from their actual income performance, especially for older retail buildings facing changing consumer patterns.

Board of Review Appeal Outcomes by Property Type

The table below summarizes New Trier Township BOR commercial appeal outcomes from our analysis of recent tax years. Win rate is the percentage of appeals that received any reduction; average reduction shows the percentage cut to assessed value when the BOR granted relief.

Click any property type to see the township-specific page with the most recent BOR case studies, including the actual pre- and post-appeal assessed values.

The 2025 Reassessment and Why BOR Appeals Still Matter

New Trier Township was reassessed by the Cook County Assessor's Office in 2025 along with the rest of the north/northwest suburban triad. Owners received reassessment notices and had a window to appeal at the Assessor level (CCAO). After the Assessor closed and certified its values, the Board of Review opened a separate appeal window. The BOR is the second of Cook County's three appeal levels (Assessor → BOR → PTAB), and it operates on a township-by-township rolling schedule that runs into 2026.

Many owners do not realize that even if they did not file with the Assessor, or if their Assessor-level appeal produced no change, the Board of Review is an independent body that re-evaluates the assessed value with fresh evidence. The BOR's grant rate for New Trier Township is 26%, which is consistent with the broader north/northwest triad. For owners with credible market evidence, the BOR is often where reductions are actually achieved.

What the 14.1% Average Means in Dollars

For a New Trier commercial property assessed at $1,000,000, a 14.1% reduction translates to roughly $141,000 of assessed value cut. After the equalization factor (approximately 3x in Cook County) and the local tax rate, that reduction typically saves the owner $36,000 per year in tax until the next reassessment in 2028. Across the full three-year cycle, that is approximately $108,000 of cumulative tax savings from a single successful appeal.

The math scales linearly with assessed value. A property assessed at $5,000,000 sees roughly five times the dollar savings; a $10,000,000 property sees ten times. The percentage win rate is the same; only the dollar magnitude changes.

Filing the BOR Appeal

The Board of Review accepts appeals through its online filing system, separately from the Assessor's SmartFile portal. Each filing requires:

• A completed BOR appeal form for the relevant property and tax year
• Dated photographs of the subject property
• Comparable sales evidence, an income approach analysis, or both, depending on the basis of appeal
• Any other evidence relevant to the property's market value (recent appraisals, vacancy documentation, environmental issues, etc.)

The specific window for New Trier Township's BOR appeals depends on the Cook County BOR's published calendar. The window typically lasts approximately 30 days. For up-to-date filing window information, see our 2026 Cook County appeal deadline calendar, which is refreshed weekly from the BOR's published schedule.

How TaxRival Approaches New Trier Appeals

For each New Trier Township property we evaluate, TaxRival's analysis pulls comparable sales filtered to the same property class and township, computes an income approach value where rent and operating expense data is available, applies the township-specific historical win rate (26%) and reduction patterns to set a realistic expectation, and assembles the documentation package that meets every CCAO and BOR rule.

The fee structure is contingency only: 25% of first-year tax savings, with no charge if we do not reduce the assessment. For a New Trier property whose successful appeal would save tens of thousands of dollars per year, the math typically supports filing.

Check Your Property

To see whether your New Trier Township commercial or multifamily property appears in our analysis as a candidate for the current Board of Review cycle, visit taxrival.com. Enter your 14-digit Cook County PIN and the analysis will show your assessed value, our market-based valuation, the implied gap, and the estimated savings if the appeal succeeds. The review is free.