# Alteration or repair permit ALT1705876 at 12 Post Office Sq, Boston

Boston Inspectional Services Department permit ALT1705876: issued Dec 15, 2025 for alteration or repair work at 12 Post Office Sq. Change of occupancy from Office spaces to Multi-Family Residential on Floors 2-6, to include 70 residential units; existing commercial uses on ground floor and basement to remain. Two buildings at 55 Kilby St and 60 Congress St combined into one to become 12 Post Office Sq, per ALT1701684 &; ALT1701690. Scope includes opening fire wall to interconnect buildings, fitout for residences, creating habitable amenity spaces with bike storage in basement, and updating flood mitigation of the building.;[ePlan].

- Permit number: ALT1705876
- Issued: Dec 15, 2025
- Type of work: Alteration or repair (city: Change Occupancy, Long Form/Alteration Permit)
- Status: Issued (city: Open)
- Reported cost: $14,316,907
- ZIP code: 02109
- All permits at this address: https://nearbypermits.com/boston/address/12-post-office-sq/

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-10 06:04 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 12 Post Office Sq: https://nearbypermits.com/boston/address/12-post-office-sq/