# Alteration or repair permit ALT1749165 at 125 Summer St, Boston

Boston Inspectional Services Department permit ALT1749165: issued Aug 22, 2025 for alteration or repair work at 125 Summer St. Interior tenant fit out of the 3rd and partial 10th floors for Klaviyo with communicating stair on 4th and 5th floor. Approximately 20,000 sq ft. Work to include; new office, communicating stair, lighting, millwork, paint, flooring, finishes and sprinkler and FA modifications.

- Permit number: ALT1749165
- Issued: Aug 22, 2025
- Type of work: Alteration or repair (city: Fast Track Application, Long Form/Alteration Permit)
- Status: Finished (city: Closed)
- Reported cost: $3,522,800
- ZIP code: 02110
- All permits at this address: https://nearbypermits.com/boston/address/125-summer-st/

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-06 11:08 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 125 Summer St: https://nearbypermits.com/boston/address/125-summer-st/