Cook County Value

910 Osage Ln, Wilmette, IL 60091

5 bed / 4 bath, 4,139 sqft, built 2008, in New Trier. Assessor market value for 2026: $2,009,870.

Cook County account 05293180220000

Assessor market value
$2,009,870
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,139 sqft
$486 per sqft
Year built
2008
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 8.6% from $2,200,000 in 2025 to $2,009,870 in 2026.
  • Assessor market value per square footThe current public record shows about $486 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 724 residential records in the same neighborhood, the average assessor market value is about $416 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -3.4% on average.

Comparable assessments

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

  • 335 Locust Rd, Winnetka, IL 60093
    4,072 sqft | $540/sqft | built 2008 | Similar size (4,072 vs 4,139 sqft); Built same year (2008); Similar lot size (11,920 vs 12,333 sqft)
    $2,200,000
  • 900 Romona Rd, Wilmette, IL 60091
    4,185 sqft | $445/sqft | built 2008 | Similar size (4,185 vs 4,139 sqft); Built same year (2008); Lot 16% larger (14,250 vs 12,333 sqft)
    $1,864,000
  • 905 Osage Ln, Wilmette, IL 60091
    4,142 sqft | $461/sqft | built 2008 | Similar size (4,142 vs 4,139 sqft); Built same year (2008); Lot 18% larger (14,585 vs 12,333 sqft)
    $1,910,000
  • 930 Seneca Rd, Wilmette, IL 60091
    4,364 sqft | $442/sqft | built 2004 | 5% larger (4,364 vs 4,139 sqft); Similar age (2004 vs 2008); Similar lot size (12,323 vs 12,333 sqft)
    $1,930,000
  • 1141 Virginia Ln, Wilmette, IL 60091
    3,960 sqft | $391/sqft | built 2000 | Similar size (3,960 vs 4,139 sqft); Similar lot size (11,841 vs 12,333 sqft); Same quality (Average)
    $1,550,000

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: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 8.6% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$2,009,870−$190,130−8.6%
2025$2,200,000+$530,000+31.7%
2024$1,670,000$00.0%
2023$1,670,000$00.0%
2022$1,670,000+$495,570+42.2%
2021$1,174,430−$33,210−2.7%
2020$1,207,640——
6-year total+$802,230+66.4%