Cook County Value

305 N Mason Ave, Chicago, IL 60644

3 bed / 1 bath, 1,138 sqft, built 2009, in West Chicago. Assessor market value for 2026: $195,830.

Cook County account 16084010320000

Assessor market value
$195,830
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,138 sqft
$172 per sqft
Year built
2009
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 60644 and West Chicago assessment pages.

Local guide: West Chicago Township 2026 Property Tax Appeal Guide.

Appeal deadlines

For West Chicago, appeals to the Assessor closed . Board of Review dates for West Chicago 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 $195,830 in 2025 to $195,830 in 2026.
  • Assessor market value per square footThe current public record shows about $172 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the West Chicago neighborhood and ZIP 60644.
  • Neighborhood value signalAmong 6,607 residential records in the same neighborhood, the average assessor market value is about $118 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -0.1% on average.

Comparable assessments

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

  • 1004 N Lawler Ave, Chicago, IL 60651
    1,114 sqft | $251/sqft | built 2007 | Similar size (1,114 vs 1,138 sqft); Similar age (2007 vs 2009); Similar lot size (3,780 vs 3,725 sqft)
    $280,000
  • 955 N Lockwood Ave, Chicago, IL 60651
    1,221 sqft | $197/sqft | built 2006 | 7% larger (1,221 vs 1,138 sqft); Similar age (2006 vs 2009); Similar lot size (3,714 vs 3,725 sqft)
    $240,000
  • 301 N Mason Ave, Chicago, IL 60644
    1,083 sqft | $222/sqft | built 2007 | Similar size (1,083 vs 1,138 sqft); Similar age (2007 vs 2009); Similar lot size (3,724 vs 3,725 sqft)
    $240,000
  • 926 N Lawler Ave, Chicago, IL 60651
    1,010 sqft | $277/sqft | built 2007 | 11% smaller (1,010 vs 1,138 sqft); Similar age (2007 vs 2009); Similar lot size (3,465 vs 3,725 sqft)
    $280,000
  • 5416 W Thomas St, Chicago, IL 60651
    1,343 sqft | $186/sqft | built 2005 | Similar age (2005 vs 2009); Similar lot size (3,750 vs 3,725 sqft); Same quality (Average)
    $250,000

Recent comparable sales

No usable comparable sales are available in this data snapshot.

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$195,830$00.0%
2025$195,830−$34,170−14.9%
2024$230,000+$80,240+53.6%
2023$149,760−$20,240−11.9%
2022$170,000$00.0%
2021$170,000+$45,950+37.0%
2020$124,050——
6-year total+$71,780+57.9%