Cook County Value

834 S Lyman Ave, Oak Park, IL 60304

4 bed / 1 bath, 1,859 sqft, built 1910, in Oak Park. Assessor market value for 2026: $620,000.

Cook County account 16171300130000

Likely too high

about $85,000

8 similar homes nearby point to a value about $85,000 lower than yours.

Assessor market value$620,000
Similar homes$535,466
$84,534 gap · bars start at $0

How sure: High · 8 similar homes (5 shown below) · public records only

Assessor market value
$620,000
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,859 sqft
$334 per sqft
Year built
1910
Average quality

Why we think so

Similar homes' assessments

Strong

8 of 8 similar homes are assessed lower per square foot. Their similarity-weighted median is $288.04/sqft, which supports a value of $535,466.

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 60304, Oak Park, and Oak Park assessment pages.

Local guide: Oak Park Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for Oak Park 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 increased 37.8% from $450,000 in 2025 to $620,000 in 2026.
  • Assessor market value per square footThe current public record shows about $334 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Oak Park neighborhood and ZIP 60304.
  • Neighborhood value signalAmong 959 residential records in the same neighborhood, the average assessor market value is about $295 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about +18.9% on average.

Comparable assessments

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

  • 824 S Taylor Ave, Oak Park, IL 60304
    1,865 sqft | $257/sqft | built 1910 | Similar size (1,865 vs 1,859 sqft); Built same year (1910); Similar lot size (4,725 vs 4,725 sqft)
    $480,000
  • 715 S Harvey Ave, Oak Park, IL 60304
    1,815 sqft | $325/sqft | built 1913 | Similar size (1,815 vs 1,859 sqft); Similar age (1913 vs 1910); Similar lot size (4,687 vs 4,725 sqft)
    $590,000
  • 722 S Harvey Ave, Oak Park, IL 60304
    1,876 sqft | $283/sqft | built 1912 | Similar size (1,876 vs 1,859 sqft); Similar age (1912 vs 1910); Similar lot size (4,687 vs 4,725 sqft)
    $530,000
  • 831 S Highland Ave, Oak Park, IL 60304
    1,781 sqft | $309/sqft | built 1908 | Similar size (1,781 vs 1,859 sqft); Similar age (1908 vs 1910); Similar lot size (4,725 vs 4,725 sqft)
    $550,000
  • 741 S Harvey Ave, Oak Park, IL 60304
    1,851 sqft | $292/sqft | built 1906 | Similar size (1,851 vs 1,859 sqft); Similar age (1906 vs 1910); Similar lot size (4,687 vs 4,725 sqft)
    $540,000

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

Up 37.8% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$620,000+$170,000+37.8%
2025$450,000$00.0%
2024$450,000$00.0%
2023$450,000+$55,660+14.1%
2022$394,340−$35,100−8.2%
2021$429,440+$100.0%
2020$429,430——
6-year total+$190,570+44.4%