Change of occupancy from Office spaces to Multi-Family Residential on Floors 2-6
Alteration or repair 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
- Type of work
- Alteration or repair
- Status
- Issued
- Reported cost
- $14,316,907
- ZIP code
- 02109
- City's category
- Change Occupancy, Long Form/Alteration Permit
- City's status
- Open
- Source
- Boston Inspectional Services Department permit data (this record)
Type of work and status are our own standard labels, so permits compare across cities. The city's wording is in the "City's category" and "City's status" rows. We show costs under $100 as not listed, because filers often enter $0 or $1 when the city doesn't require a cost.
All permits at 12 Post Office Sq, and what's permitted nearby
Boston Inspectional Services Department updated its data Oct 9, 2026. We checked it Oct 10, 01:04 UTC. See the city's official records.
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