Cook County Value

1009 Keystone Ave, Northbrook, IL 60062

3 bed / 1 bath, 1,395 sqft, built 1942, in Northfield. Assessor market value for 2026: $490,000.

Cook County account 04101060030000

Assessor market value
$490,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,395 sqft
$351 per sqft
Year built
1942
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 60062 and Northfield assessment pages.

Local guide: Northfield Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Northfield, appeals to the Assessor closed . Board of Review dates for Northfield have not been published yet.

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 stayed about the same, from $490,000 in 2025 to $490,000 in 2026.
  • Assessor market value per square footThe current public record shows about $351 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Northfield neighborhood and ZIP 60062.
  • Neighborhood value signalAmong 1,572 residential records in the same neighborhood, the average assessor market value is about $309 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -0.3% on average.

Comparable assessments

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

  • 1876 Kiest Ave, Northbrook, IL 60062
    1,437 sqft | $299/sqft | built 1941 | Similar size (1,437 vs 1,395 sqft); Similar age (1941 vs 1942); Similar lot size (7,500 vs 7,500 sqft)
    $429,860
  • 924 Meadow Rd, Northbrook, IL 60062
    1,396 sqft | $287/sqft | built 1955 | Similar size (1,396 vs 1,395 sqft); Similar lot size (7,515 vs 7,500 sqft); Same quality (Average)
    $400,000
  • 2447 Center St, Northbrook, IL 60062
    1,384 sqft | $275/sqft | built 1951 | Similar size (1,384 vs 1,395 sqft); Similar lot size (7,503 vs 7,500 sqft); Same quality (Average)
    $380,690
  • 631 Dundee Rd, Northbrook, IL 60062
    1,384 sqft | $253/sqft | built 1955 | Similar size (1,384 vs 1,395 sqft); Similar lot size (7,440 vs 7,500 sqft); Same quality (Average)
    $350,000
  • 1107 Whitfield Rd, Northbrook, IL 60062
    1,418 sqft | $268/sqft | built 1953 | Similar size (1,418 vs 1,395 sqft); Similar lot size (7,671 vs 7,500 sqft); Same quality (Average)
    $380,000

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

No change in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$490,000$00.0%
2025$490,000+$18,920+4.0%
2024$471,080$00.0%
2023$471,080−$38,920−7.6%
2022$510,000+$159,320+45.4%
2021$350,680+$100.0%
2020$350,670——
6-year total+$139,330+39.7%