Cook County Value

526 Isabella St, Wilmette, IL 60091

4 bed / 2 bath, 2,377 sqft, built 1999, in New Trier. Assessor market value for 2026: $1,193,780.

Cook County account 05344120310000

Assessor market value
$1,193,780
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,377 sqft
$502 per sqft
Year built
1999
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 8.9% from $1,310,000 in 2025 to $1,193,780 in 2026.
  • Assessor market value per square footThe current public record shows about $502 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

Similar public appraisal records selected for this property's equity comparison.

  • 1007 Linden Ave, Wilmette, IL 60091
    2,489 sqft | $549/sqft | built 1999 | Similar size (2,489 vs 2,377 sqft); Built same year (1999); Similar lot size (7,500 vs 7,725 sqft)
    $1,365,770
  • 1510 Wilmette Ave, Wilmette, IL 60091
    2,202 sqft | $530/sqft | built 1995 | 7% smaller (2,202 vs 2,377 sqft); Similar age (1995 vs 1999); Similar lot size (7,816 vs 7,725 sqft)
    $1,166,530
  • 1428 Gregory Ave, Wilmette, IL 60091
    2,336 sqft | $502/sqft | built 1988 | Similar size (2,336 vs 2,377 sqft); Lot 11% larger (8,550 vs 7,725 sqft); Same quality (Average)
    $1,173,270
  • 345 Maple Ave, Wilmette, IL 60091
    2,350 sqft | $505/sqft | built 1996 | Similar size (2,350 vs 2,377 sqft); Similar age (1996 vs 1999); Lot 19% smaller (6,250 vs 7,725 sqft)
    $1,186,140
  • 135 16th St, Wilmette, IL 60091
    2,678 sqft | $493/sqft | built 1990 | 13% larger (2,678 vs 2,377 sqft); Similar lot size (7,540 vs 7,725 sqft); Same quality (Average)
    $1,320,000

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: . Showing the last prepared sales evidence while recent sales are refreshed. Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 8.9% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,193,780−$116,220−8.9%
2025$1,310,000+$368,530+39.1%
2024$941,470——
2-year total+$252,310+26.8%