5721 W Byron St
A handful of records on file over the last seven years, and our model sees a moderate chance of more 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 Portage Park average of 0.6.
What's in the 5721 W Byron St report
| Units | 2 |
|---|---|
| Year built | 1914 |
| Stories | — |
| Building area | 2,683 sq ft |
| Property class | 211 |
| PIN (Cook County parcel) | 13202100120000 |
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 5721 W Byron St in Portage Park, owned by Paul Sanczewski, has a notable record of recent activity, particularly in 2025-2026. The 109-year-old property has experienced two open building code violations since February 2022, which were initiated through complaint-driven inspections and remain unresolved as of the latest data. The building has generated multiple 311 service requests over the past seven years, with the most recent being related to tree planting in May 2026, which is currently open. An unusual cluster of service requests occurred in September 2025, including a garbage cart maintenance issue and a rodent baiting complaint, both of which were resolved, as well as a nuisance animal complaint in March 2025 that was also closed. Additional animal-related issues were reported in March 2025, including a pet wellness check request. The property has had two environmental complaints regarding construction and demolition activities, with the most recent being reported in May 2023 and resolved the following day. While the building's age is substantial, the record suggests ongoing maintenance and environmental management issues, particularly concerning waste management, pest control, and tree maintenance, with particular attention needed to the open building code violations from 2022.
AI-generated · may contain errors · check the source data tables below
How 5721 W Byron St'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 3924 buildings in this neighborhood, 3453 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.
5721 W Byron St apartment reviews
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5721 W Byron St event timeline
Building violations, environmental complaints and enforcement, permits, scofflaw listings, and 311 calls — most recent records in order.
See all 8 events
Full history back to 2022 — violations, complaints, permits, and 311 calls.
Unlock complete timelineFull data for 5721 W Byron St 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.
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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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Cancel anytime · Data sourced from the City of Chicago Department of Buildings, Chicago 311, Cook County Assessor & the Chicago Data Portal