3859 N Oconto Ave
A handful of records on file over the last seven years, and our model puts this building at a low risk of further maintenance problems in the next 12 months. A few records worth reading before you sign. Check whether they were closed out, and ask what was actually fixed.
This building has 2 building violations (7y), above the Dunning average of 0.8.
The bar and the rating point different ways because they measure different things: the bar counts building violations already on file, the rating forecasts the next 12 months.
What's in the 3859 N Oconto Ave report
| Units | 2 |
|---|---|
| Year built | 1922 |
| Stories | — |
| Building area | 1,470 sq ft |
| Property class | 211 |
| PIN (Cook County parcel) | 12242160010000 |
Registered owner per Cook County Assessor records.
Landlord portfolio
Other Chicago properties this owner holds, with a risk rating for each.
Unlock complete reportThe two-unit residential building at 3859 N Oconto Ave in the Dunning neighborhood, owned by Andrzej Mazurek, has experienced a number of notable events and service interactions over the past two years. Built in 1922, this property has had two building code violations recorded in March 2025, both of which were promptly resolved through compliance. The building's recent service history shows a pattern of community-initiated requests, with a total of 12 311 service interactions between 2025 and 2023. These service requests cover a diverse range of issues, including three animal-related incidents (a pet wellness check, a vicious animal complaint, and presumably a pet-related matter), a street maintenance issue (pothole complaint), and waste management concerns (blue recycling cart issue). The most recent violations and service interactions suggest active engagement with municipal services, though it's worth noting that the majority of the 311 requests were resolved promptly, as indicated by their "Closed" status.
AI-generated · may contain errors · check the source data tables below
How 3859 N Oconto Ave's risk score is calculated
We trained a model on 7 years of Chicago code enforcement data — building violations, 311 complaint history, environmental enforcement, and owner track records. It estimates the probability that the City of Chicago will find a code violation at this address in the next 12 months. Lower % = safer.
What the score means for you
Lower risk — safer than most nearby
City inspectors rarely find violations here. Strong maintenance history and a clean complaint record.
Typical — about average for the neighborhood
Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.
Higher risk — riskier than most nearby
Elevated violation and complaint history. City inspectors have found issues here before and are statistically likely to again.
Out of 1070 buildings in this neighborhood, 332 are predicted to be safer. The band is relative to this neighborhood, so a share of every neighborhood falls in each colour.
violation
likely
What's driving this score
The data points that most influenced this building's risk rating — ranked by the weight the model placed on each one.
3859 N Oconto Ave apartment reviews
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3859 N Oconto Ave event timeline
Building violations, environmental complaints and enforcement, permits, scofflaw listings, and 311 calls — most recent records in order.
See all 4 events
Full history back to 2024 — violations, complaints, permits, and 311 calls.
Unlock complete timelineFull data for 3859 N Oconto Ave apartments
Chicago public datasets for this parcel — building violations, permits, 311 calls, environmental complaints and enforcement, scofflaw listings, and vacant building registrations.
What this is
Violations issued by the City of Chicago Department of Buildings against this parcel.
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What this is
Violations issued for failure to register or maintain a vacant or abandoned building.
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What this is
Building permits issued by the City of Chicago for new construction, alterations, and repairs at this parcel.
| Permit # | Issued | Status | Description |
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What this is
Chicago 311 service requests recorded at this parcel — maintenance complaints and quality-of-life requests.
| SR # | Created | Type | Department | Status |
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What this is
Environmental complaints filed about this property with the City of Chicago.
| Complaint # | Date | Type | Inspector | Resolution | Resolved |
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What this is
Formal environmental enforcement cases brought against this property.
| Case # | Date | Type | Violation | Disposition | Status | Fine |
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Unlock complete reportHow 3859 N Oconto Ave compares to the neighborhood
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Cancel anytime · Data sourced from the City of Chicago Department of Buildings, Chicago 311, Cook County Assessor & the Chicago Data Portal