Cook County Value

516 Isabella St, Wilmette, IL 60091

3 bed / 1 bath, 1,728 sqft, built 1926, in New Trier. Assessor market value for 2026: $896,490.

Cook County account 05344120140000

Assessor market value
$896,490
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,728 sqft
$519 per sqft
Year built
1926
Average quality

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 60091 and New Trier assessment pages.

Local guide: New Trier Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for New Trier have closed (Assessor , Board of Review ). 2027 notices usually start in March.

Deadline rule: Set by township: file with the Assessor by your township's last file date, and with the Board of Review while your township is open there. Evidence is reviewed by the Cook County Assessor's Office or, in a separate appeal, by the Cook County Board of Review. Dates checked against the official source.

Assessment snapshot

These public CCAO records highlight what may be worth checking before you file.

  • Assessment changeThe assessor market value decreased 18.5% from $1,100,000 in 2025 to $896,490 in 2026.
  • Assessor market value per square footThe current public record shows about $519 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the New Trier neighborhood and ZIP 60091.
  • Neighborhood value signalAmong 1,671 residential records in the same neighborhood, the average assessor market value is about $458 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -2.4% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 1242 Isabella St, Wilmette, IL 60091
    1,756 sqft | $524/sqft | built 1925 | Similar size (1,756 vs 1,728 sqft); Similar age (1925 vs 1926); Similar lot size (5,825 vs 5,907 sqft)
    $920,000
  • 407 Maple Ave, Wilmette, IL 60091
    1,717 sqft | $460/sqft | built 1926 | Similar size (1,717 vs 1,728 sqft); Built same year (1926); Similar lot size (6,150 vs 5,907 sqft)
    $790,010
  • 115 16th St, Wilmette, IL 60091
    1,711 sqft | $409/sqft | built 1929 | Similar size (1,711 vs 1,728 sqft); Similar age (1929 vs 1926); Similar lot size (5,688 vs 5,907 sqft)
    $700,000
  • 611 Harvard St, Wilmette, IL 60091
    1,742 sqft | $391/sqft | built 1927 | Similar size (1,742 vs 1,728 sqft); Similar age (1927 vs 1926); Similar lot size (5,655 vs 5,907 sqft)
    $680,260
  • 302 17th St, Wilmette, IL 60091
    1,732 sqft | $458/sqft | built 1925 | Similar size (1,732 vs 1,728 sqft); Similar age (1925 vs 1926); Similar lot size (6,400 vs 5,907 sqft)
    $793,170

Recent comparable sales

Sales selected by similarity to the subject property.

Public appraisal comparison for 2026. Prepared . Appraisal source: Cook County Assessor's Office. Sales data checked in this snapshot: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 18.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$896,490−$203,510−18.5%
2025$1,100,000+$460,000+71.9%
2024$640,000$00.0%
2023$640,000$00.0%
2022$640,000+$105,730+19.8%
2021$534,270$00.0%
2020$534,270——
6-year total+$362,220+67.8%