# Mechanical (HVAC) permit 100260206 at 431 S Dearborn St, Chicago

Chicago Department of Buildings permit 100260206: issued Oct 1, 2008 for mechanical (hvac) work at 431 S Dearborn St. Replace a 3.5 ton water source heat pump and 11.5k.w. Duct heater with a mcquay 3.5 ton water source heat pump and markel heater.

- Permit number: 100260206
- Issued: Oct 1, 2008
- Type of work: Mechanical (HVAC) (city: Permit - easy permit process)
- Status: Issued (city: not listed)
- Reported cost: Not listed
- ZIP code: 60605 (derived from location)
- All permits at this address: https://nearbypermits.com/chicago/address/431-s-dearborn-st/

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Source: Chicago Department of Buildings permit data (https://data.cityofchicago.org/d/ydr8-5enu). Checked 2026-10-12 00:00 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

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Every permit at 431 S Dearborn St: https://nearbypermits.com/chicago/address/431-s-dearborn-st/