Cook County Value

1023 Blackthorn Ln, Northbrook, IL 60062

4 bed / 2 bath, 2,599 sqft, built 1977, in Northfield. Assessor market value for 2026: $770,100.

Cook County account 04092030020000

Assessor market value
$770,100
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
2,599 sqft
$296 per sqft
Year built
1977
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 2.5% from $790,000 in 2025 to $770,100 in 2026.
  • Assessor market value per square footThe current public record shows about $296 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 2,200 residential records in the same neighborhood, the average assessor market value is about $346 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -2.0% on average.

Comparable assessments

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

  • 916 Rolling Pass, Glenview, IL 60025
    2,389 sqft | $326/sqft | built 1974 | 8% smaller (2,389 vs 2,599 sqft); Similar age (1974 vs 1977); Similar lot size (7,614 vs 7,620 sqft)
    $780,000
  • 1807 Elm Ave, Northbrook, IL 60062
    2,451 sqft | $272/sqft | built 1975 | 6% smaller (2,451 vs 2,599 sqft); Similar age (1975 vs 1977); Similar lot size (7,425 vs 7,620 sqft)
    $666,010
  • 2233 Cherry Ln, Northbrook, IL 60062
    2,592 sqft | $285/sqft | built 1962 | Similar size (2,592 vs 2,599 sqft); Similar lot size (7,500 vs 7,620 sqft); Same quality (Average)
    $740,000
  • 2144 Larkdale Dr, Glenview, IL 60025
    2,560 sqft | $375/sqft | built 1977 | Similar size (2,560 vs 2,599 sqft); Built same year (1977); Same quality (Average)
    $960,000
  • 701 Spruce St, Glenview, IL 60025
    2,617 sqft | $326/sqft | built 1974 | Similar size (2,617 vs 2,599 sqft); Similar age (1974 vs 1977); Lot 19% larger (9,100 vs 7,620 sqft)
    $853,320

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 2.5% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$770,100−$19,900−2.5%
2025$790,000+$213,250+37.0%
2024$576,750——
2-year total+$193,350+33.5%