6423 S Knox Ave
This building has a substantial enforcement record over the last seven years, and our model sees a moderate chance of more in the next 12 months. Read the records below before you sign. Ask which issues were resolved, get repair commitments in writing, and inspect the unit yourself.
This building has 5 building violations (7y), above the Clearing average of 1.2.
What's in the 6423 S Knox Ave report
| Units | 2 |
|---|---|
| Year built | 1918 |
| Stories | — |
| Building area | 2,251 sq ft |
| Property class | 211 |
| PIN (Cook County parcel) | 19221110080000 |
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 6423 S Knox Ave in Chicago's Clearing neighborhood, owned by Leo P Schmitz, has a documented history dating back to its 1918 construction. Over the past seven years, the building has experienced multiple significant issues, with particular concern regarding water quality. Most notably, there are currently two open building code violations from April 2021 that remain unresolved. The property has undergone several water-related incidents in 2025, including a water quality concern, a lead test visit, and a water in basement complaint, all of which were eventually closed. Earlier service requests in 2024 included an alley sewer inspection and a general information call to 311. The building's violation history shows some improvements, with three resolved permit-related inspections in September 2019, though the property has accumulated a total of five building violations and five service requests over the seven-year period, indicating ongoing maintenance challenges.
AI-generated · may contain errors · check the source data tables below
How 6423 S Knox 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 624 buildings in this neighborhood, 512 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.
6423 S Knox Ave apartment reviews
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6423 S Knox Ave event timeline
Building violations, environmental complaints and enforcement, permits, scofflaw listings, and 311 calls — most recent records in order.
See all 9 events
Full history back to 2019 — violations, complaints, permits, and 311 calls.
Unlock complete timelineFull data for 6423 S Knox 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.
| Violation # | Date | Category | Status | Address |
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What this is
Violations issued for failure to register or maintain a vacant or abandoned building.
| Docket # | Violation # | Issued | Department | Type | Disposition | Total Fines |
|---|---|---|---|---|---|---|
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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 6423 S Knox 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