Cook County Value

3309 Sunnyside Ave, Brookfield, IL 60513

4 bed / 1 bath, 1,057 sqft, built 1949, in Proviso. Assessor market value for 2026: $320,000.

Cook County account 15342180030000

Assessor market value
$320,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,057 sqft
$303 per sqft
Year built
1949
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 60513 and Proviso assessment pages.

Local guide: Proviso Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For Proviso, appeals to the Assessor are open through (8 days left).

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 increased 55.9% from $205,250 in 2025 to $320,000 in 2026.
  • Assessor market value per square footThe current public record shows about $303 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Proviso neighborhood and ZIP 60513.
  • Neighborhood value signalAmong 757 residential records in the same neighborhood, the average assessor market value is about $277 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +33.3% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 8949 Monroe Ave, Brookfield, IL 60513
    1,050 sqft | $120/sqft | built 1954 | Similar size (1,050 vs 1,057 sqft); Similar age (1954 vs 1949); Similar lot size (3,750 vs 3,780 sqft)
    $126,260
  • 3304 Elm Ave, Brookfield, IL 60513
    1,032 sqft | $193/sqft | built 1953 | Similar size (1,032 vs 1,057 sqft); Similar age (1953 vs 1949); Similar lot size (3,780 vs 3,780 sqft)
    $199,030
  • 3109 Elm Ave, Brookfield, IL 60513
    1,104 sqft | $281/sqft | built 1948 | Similar size (1,104 vs 1,057 sqft); Similar age (1948 vs 1949); Similar lot size (3,780 vs 3,780 sqft)
    $310,000
  • 3107 Vernon Ave, Brookfield, IL 60513
    1,086 sqft | $276/sqft | built 1944 | Similar size (1,086 vs 1,057 sqft); Similar age (1944 vs 1949); Similar lot size (3,780 vs 3,780 sqft)
    $300,000
  • 3110 Elm Ave, Brookfield, IL 60513
    1,036 sqft | $169/sqft | built 1953 | Similar size (1,036 vs 1,057 sqft); Similar age (1953 vs 1949); Similar lot size (3,780 vs 3,780 sqft)
    $174,850

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

Up 55.9% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$320,000+$114,750+55.9%
2025$205,250−$7,720−3.6%
2024$212,970−$27,030−11.3%
2023$240,000+$54,580+29.4%
2022$185,420−$19,870−9.7%
2021$205,290−$27,000−11.6%
2020$232,290——
6-year total+$87,710+37.8%