# Mechanical (HVAC) permit B200453280 at 637 S Dearborn St, Chicago

Chicago Department of Buildings permit B200453280: issued Dec 12, 2025 for mechanical (hvac) work at 637 S Dearborn St. Repair/replacement affecting 1 systems : 1 rooftop packaged unit(trane ysk300a3s0h roof). Electrical work under this permit = no. Locations: 0 residential unit(s), 1 non-residential unit(s), exterior work, rooftop.

- Permit number: B200453280
- Issued: Dec 12, 2025
- Type of work: Mechanical (HVAC) (city: Mechanical work, permit – express permit program)
- Status: Issued (city: Active)
- Reported cost: $57,000
- ZIP code: 60605 (derived from location)
- All permits at this address: https://nearbypermits.com/chicago/address/637-s-dearborn-st/

---
Source: Chicago Department of Buildings permit data (https://data.cityofchicago.org/d/ydr8-5enu). Checked 2026-10-05 21:35 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

This site provides applications using data that has been modified for use from its original source, www.cityofchicago.org, the official website of the City of Chicago. The City of Chicago makes no claims as to the content, accuracy, timeliness, or completeness of any of the data provided at this site. The data provided at this site is subject to change at any time. It is understood that the data provided at this site is being used at one's own risk.

Every permit at 637 S Dearborn St: https://nearbypermits.com/chicago/address/637-s-dearborn-st/