Cook County Value

521 Park Ave, Wilmette, IL 60091

4 bed / 3 bath, 4,012 sqft, built 2011, in New Trier. Assessor market value for 2026: $2,000,140.

Cook County account 05341150220000

Assessor market value
$2,000,140
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
4,012 sqft
$499 per sqft
Year built
2011
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 4.3% from $2,090,000 in 2025 to $2,000,140 in 2026.
  • Assessor market value per square footThe current public record shows about $499 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.

  • 629 Harvard St, Wilmette, IL 60091
    4,023 sqft | $412/sqft | built 2012 | Similar size (4,023 vs 4,012 sqft); Similar age (2012 vs 2011); Similar lot size (9,250 vs 9,004 sqft)
    $1,659,200
  • 625 Harvard St, Wilmette, IL 60091
    3,965 sqft | $441/sqft | built 2013 | Similar size (3,965 vs 4,012 sqft); Similar age (2013 vs 2011); Similar lot size (9,250 vs 9,004 sqft)
    $1,750,010
  • 805 Harvard St, Wilmette, IL 60091
    4,190 sqft | $426/sqft | built 2014 | Similar size (4,190 vs 4,012 sqft); Similar age (2014 vs 2011); Similar lot size (9,250 vs 9,004 sqft)
    $1,783,890
  • 2108 Birchwood Ave, Wilmette, IL 60091
    3,856 sqft | $410/sqft | built 2012 | Similar size (3,856 vs 4,012 sqft); Similar age (2012 vs 2011); Similar lot size (8,750 vs 9,004 sqft)
    $1,582,310
  • 2042 Washington Ave, Wilmette, IL 60091
    3,859 sqft | $407/sqft | built 2007 | Similar size (3,859 vs 4,012 sqft); Similar age (2007 vs 2011); Similar lot size (8,700 vs 9,004 sqft)
    $1,570,000

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 4.3% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$2,000,140−$89,860−4.3%
2025$2,090,000+$541,700+35.0%
2024$1,548,300−$51,700−3.2%
2023$1,600,000$00.0%
2022$1,600,000+$317,010+24.7%
2021$1,282,990−$33,000−2.5%
2020$1,315,990——
6-year total+$684,150+52.0%