What we do
Four ways we deliver for Chicago owners, managers, and investors
Property records
311 complaints, DOB violations, permits, ownership and sales, and tax assessment history — every Chicago parcel, compiled into one property unlock per building.
Learn morePermit & business explore feeds
Citywide feeds of building permits, pending applications, and business licenses. Filter, sort, and map every record — refreshed as the city files it.
Learn moreLive portfolio monitoring
Real-time 311, violation, and permit alerts across every address you manage — in your inbox within one refresh cycle of the city logging it.
Learn moreAI enablement for developers & underwriters
Practical AI workflows over city data — site screening, document processing, and underwriting support. Start with a focused project or ongoing data support.
Learn moreOur products
Software built on our Chicago property data infrastructure
Property unlocks
One permanent unlock per building: complaint context the public feed never shows, violations, permits, ownership and sales, and tax assessment — with live monitoring once unlocked. Your first unlock is free.
City Explore
Permit, pending-application, and business-license feeds for the whole city. Build filters, watch activity cluster on the density map, and export what you find.
Why Property Sentinel
Depth of data no one else has, refreshed while it still matters
Proprietary data
Complaint narratives, intake answers, and workflow timelines pulled from the city's case system — context the public 311 feed never shows.
Refreshed every 30 minutes
13M+ 311 records synced on a 30-minute loop, with permits, violations, licenses, and assessments on their own daily, weekly, and monthly cycles.
Chicago-deep, not nationwide-thin
One city covered completely: 1.86M parcels of assessor, DOB, and licensing data cross-referenced by parcel, building, ward, and neighborhood.
Alerts you can act on
Every alert carries the owning department, resolution benchmarks, and the workflow stage — enough to act before the inspector arrives.