Cook County Value

1049 Keystone Ave, Northbrook, IL 60062

4 bed / 3 bath, 3,113 sqft, built 2012, in Northfield. Assessor market value for 2026: $1,122,690.

Cook County account 04101080290000

Assessor market value
$1,122,690
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
3,113 sqft
$361 per sqft
Year built
2012
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 decreased 5.7% from $1,190,000 in 2025 to $1,122,690 in 2026.
  • Assessor market value per square footThe current public record shows about $361 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.

  • 1959 Butternut Ln, Northbrook, IL 60062
    3,129 sqft | $380/sqft | built 2006 | Similar size (3,129 vs 3,113 sqft); Similar lot size (10,075 vs 10,147 sqft); Same quality (Average)
    $1,190,000
  • 2411 Maple Ave, Northbrook, IL 60062
    3,126 sqft | $396/sqft | built 2009 | Similar size (3,126 vs 3,113 sqft); Similar age (2009 vs 2012); Similar lot size (9,750 vs 10,147 sqft)
    $1,238,990
  • 2232 Scott Rd, Northbrook, IL 60062
    3,127 sqft | $360/sqft | built 2012 | Similar size (3,127 vs 3,113 sqft); Built same year (2012); Similar lot size (10,140 vs 10,147 sqft)
    $1,125,200
  • 1972 Penfold Pl, Northbrook, IL 60062
    3,077 sqft | $383/sqft | built 2009 | Similar size (3,077 vs 3,113 sqft); Similar age (2009 vs 2012); Similar lot size (10,075 vs 10,147 sqft)
    $1,178,310
  • 1941 Milton Ave, Northbrook, IL 60062
    3,174 sqft | $368/sqft | built 2008 | Similar size (3,174 vs 3,113 sqft); Similar age (2008 vs 2012); Similar lot size (10,123 vs 10,147 sqft)
    $1,166,660

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 5.7% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$1,122,690−$67,310−5.7%
2025$1,190,000+$228,480+23.8%
2024$961,520——
2-year total+$161,170+16.8%