# Alteration or repair permit ALT1706153 at 9 Arch St, Boston

Boston Inspectional Services Department permit ALT1706153: issued Dec 11, 2025 for alteration or repair work at 9 Arch St. Change of occupancy from Offices to Multi-family Dwelling for 110 units; ground floor Store occupancy to remain. Renovation of 11-story office condominium from an office use to residential use containing 110 rental apartments and amenity spaces under the Downtown Office to Residential Conversion Pilot Program. First floor Post Office (separately owned) and exterior will remain unchanged.;[ePlan].

- Permit number: ALT1706153
- Issued: Dec 11, 2025
- Type of work: Alteration or repair (city: Change Occupancy, Long Form/Alteration Permit)
- Status: Issued (city: Open)
- Reported cost: $20,035,000
- ZIP code: 02109
- All permits at this address: https://nearbypermits.com/boston/address/9-arch-st/

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-06 18:32 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 9 Arch St: https://nearbypermits.com/boston/address/9-arch-st/