401 W Ontario St
This project involves a major adaptive reuse of an existing four-story office building into a 57-unit residential property. Scope of work includes a new partial fifth-floor vertical addition, extensive interior renovations across all levels, and the installation of a building-wide fire suppression system.
Largest single reported permit cost — not a summed project total. Individual permit values can overlap in scope.
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Activity
How much relevant permit activity is on this site.
Trade fit
How well this project matches each trade, from linked permits. Select a trade to filter parties & permits.
| Trade | Fit | Evidence |
|---|---|---|
| Medium | Major construction permits |
Permit ledger
All 1 permit on this record| Permit | Description | Status | Contractor | ||
|---|---|---|---|---|---|
101081716 Renovation | Renovation of an existing 4-story office building and a new partial 5th-floor addition to convert the structure into a 57-unit residential building. | APR 3, 2026 | Active | $7,500,000 | 3f Construction LLC |
Key parties
Sources: City of Chicago Dept. of Buildings permit feed · Cook County Assessor parcel records
Source Chicago Building Permits · Last calculated Oct 11, 2026
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