4837 S Union Ave 1
This building has a substantial enforcement record over the last seven years, but recent activity points to a low risk of further maintenance problems 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 21 building violations (7y), above the New City average of 1.5.
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 4837 S Union Ave 1 report
| Units | 2 |
|---|---|
| Year built | 1894 |
| Stories | — |
| Building area | 2,250 sq ft |
| Property class | 211 |
| PIN (Cook County parcel) | 20091080020000 |
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 4837 South Union Avenue in the New City neighborhood, owned by CHRLS & CHRISTNE DELEO, is a 129-year-old structure built in 1894. Over the past seven years, there have been five 311 service requests associated with this property, with the most recent being an open sign repair request from May 2026. The building has experienced several notable incidents in 2026, including two separate vicious animal complaints in February 2026 and a rodent baiting complaint in April 2026, all of which have been resolved according to city records. Prior to these incidents, there was a pet wellness check request in September 2025, which was also closed. While the building has a relatively low number of reported service requests for its age, the recent cluster of animal-related incidents and pest concerns in 2026 stands out as the most significant series of events on record for this property.
AI-generated · may contain errors · check the source data tables below
How 4837 S Union Ave 1'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 4198 buildings in this neighborhood, 1847 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.
4837 S Union Ave 1 apartment reviews
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4837 S Union Ave 1 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 2026 — violations, complaints, permits, and 311 calls.
Unlock complete timelineFull data for 4837 S Union Ave 1 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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Cancel anytime · Data sourced from the City of Chicago Department of Buildings, Chicago 311, Cook County Assessor & the Chicago Data Portal