# Alteration or repair permit 101074453 at 4100 S Union Ave, Chicago

Chicago Department of Buildings permit 101074453: issued Oct 3, 2025 for alteration or repair work at 4100 S Union Ave. Self-cert 2019 CBRC: tenant build out of existing 782 sf building to new office including alteration to new toilet rooms occupancy group B; type 3b construction).

- Permit number: 101074453
- Issued: Oct 3, 2025
- Type of work: Alteration or repair (city: Permit - renovation/alteration)
- Status: Issued (city: Active)
- Reported cost: $20,000
- ZIP code: 60609 (derived from location)
- All permits at this address: https://nearbypermits.com/chicago/address/4100-s-union-ave/

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Source: Chicago Department of Buildings permit data (https://data.cityofchicago.org/d/ydr8-5enu). Checked 2026-10-07 14:00 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

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Every permit at 4100 S Union Ave: https://nearbypermits.com/chicago/address/4100-s-union-ave/