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Commission approves additions and setback exceptions for 380 Ashton Avenue amid neighbor concerns about shade and seismic bracing

City of Millbrae Planning Commission · December 16, 2025
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Summary

The Planning Commission approved a design review permit, conditional use permit and exception requests for 380 Ashton Avenue (small first‑ and second‑floor additions and extensions of nonconforming setbacks). Neighbors raised concerns about potential shadowing and an adjacent unreinforced masonry fireplace; staff said plan check and building code requirements address seismic bracing.

The City of Millbrae Planning Commission on Dec. 15 voted 4–0 to approve a design review permit and a conditional use permit for work at 380 Ashton Avenue that would add a 7.87‑square‑foot first‑floor entry and a 51‑square‑foot second‑floor addition, extend an existing nonconforming upper‑story right‑side setback, and preserve other nonconforming setbacks.

Consultant planner Claire May told commissioners the property is on a triangular lot in the Highlands neighborhood and that the project would increase the building height in places and enclose an existing upper‑level deck. May said the application requires a conditional use permit to extend an existing nonconforming upper‑story right‑side setback (the application cited a proposed 7 ft. 3 in. setback where the code requires 13 feet) and a setback…

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