Cook County Value

8307 N Olcott Ave, Niles, IL 60714

4 bed / 2 bath, 1,456 sqft, built 1929, in Leyden. Assessor market value for 2026: $388,880.

Cook County account 09244020670000

Assessor market value
$388,880
Tax year 2026 · before exemptions; the assessed value on your notice is 10% of it
Living area
1,456 sqft
$267 per sqft
Year built
1929
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 60714 and Leyden assessment pages.

Local guide: Maine Township 2026 Property Tax Appeal Guide.

Appeal deadlines

The 2026 appeal windows for Maine 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 decreased 7.4% from $420,010 in 2025 to $388,880 in 2026.
  • Assessor market value per square footThe current public record shows about $267 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Leyden neighborhood and ZIP 60714.
  • Neighborhood value signalAmong 4,336 residential records in the same neighborhood, the average assessor market value is about $284 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -1.5% on average.

Comparable assessments

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

  • 8314 N Osceola Ave, Niles, IL 60714
    1,401 sqft | $282/sqft | built 1929 | Similar size (1,401 vs 1,456 sqft); Built same year (1929); Similar lot size (5,875 vs 6,125 sqft)
    $395,250
  • 8304 N Olcott Ave, Niles, IL 60714
    1,455 sqft | $282/sqft | built 1942 | Similar size (1,455 vs 1,456 sqft); Similar lot size (6,313 vs 6,125 sqft); Same quality (Average)
    $410,000
  • 8103 N Osceola Ave, Niles, IL 60714
    1,600 sqft | $256/sqft | built 1928 | 10% larger (1,600 vs 1,456 sqft); Similar age (1928 vs 1929); Similar lot size (5,580 vs 6,125 sqft)
    $410,000
  • 8332 N Osceola Ave, Niles, IL 60714
    1,568 sqft | $268/sqft | built 1941 | 8% larger (1,568 vs 1,456 sqft); Similar lot size (6,188 vs 6,125 sqft); Same quality (Average)
    $420,000
  • 7401 W Main St, Niles, IL 60714
    1,540 sqft | $292/sqft | built 1942 | 6% larger (1,540 vs 1,456 sqft); Similar lot size (5,760 vs 6,125 sqft); Same quality (Average)
    $450,000

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

Down 7.4% in 2026 from 2025.

Assessor market value by tax year, with the change from the previous year listed
Tax yearAssessor market valueChangeChange %
2026$388,880−$31,130−7.4%
2025$420,010+$90,520+27.5%
2024$329,490$00.0%
2023$329,490$00.0%
2022$329,490+$90,340+37.8%
2021$239,150+$200.0%
2020$239,130——
6-year total+$149,750+62.6%