4230 N Mason Ave
Nothing on record for this building in the last seven years, and our model puts it at a low risk of maintenance problems over the next 12 months. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.
This building has 0 building violations (7y), at or below the Portage Park average of 0.6.
What's in the 4230 N Mason Ave report
| Units | 2 |
|---|---|
| Year built | 1982 |
| Stories | — |
| Building area | 2,736 sq ft |
| Property class | 211 |
| PIN (Cook County parcel) | 13174080300000 |
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 4230 N Mason Ave in Portage Park, constructed in 1982 and currently owned by BNS Holdings, has maintained a relatively straightforward service record over the past several decades. The most significant recent activity occurred in 2026, with five tree trimming requests filed between April and June, all of which have been closed. Prior to these, the only notable service request in recent years was a blue recycling cart request made in December 2025, which was also resolved. Looking further back in the building's history, there were three environmental complaints related to air pollution work in 1998, with incidents reported in July and November, and a more general complaint in August 2004; however, there have been no such complaints recorded in recent years. Overall, the building's recent service history indicates regular maintenance requests primarily focused on exterior maintenance (tree trimming) rather than building-specific issues.
AI-generated · may contain errors · check the source data tables below
How 4230 N Mason 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 3924 buildings in this neighborhood, 2472 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.
4230 N Mason Ave apartment reviews
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4230 N Mason Ave event timeline
Building violations, environmental complaints and enforcement, permits, scofflaw listings, and 311 calls — most recent records in order.
See all 5 events
Full history back to 1998 — violations, complaints, permits, and 311 calls.
Unlock complete timelineFull data for 4230 N Mason 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.
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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