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Planning commission approves variance to replace unsafe upper deck at 316 Hillside Avenue
Summary
The Mill Valley Planning Commission unanimously approved a variance allowing a rebuilt upper‑level deck at 316 Hillside Avenue that will exceed local height and setback limits after staff cited site slope, an updated boundary survey, structural constraints and neighborhood support. The owners said the existing deck was unsafe and the new design aims to reduce bulk where feasible.
The Mill Valley Planning Commission on Sept. 9 unanimously approved a variance to replace and modestly enlarge an existing nonconforming upper deck at 316 Hillside Avenue, finding the proposal meets local criteria given steep topography, dense vegetation and structural constraints.
Associate Planner Michelle Johnson told the commission the application requests relief from the city’s height and setback limits — including a proposed maximum height of 42 feet — and noted a newly submitted boundary survey shifted the lot line closer to the existing deck. The lot is 7,125 square feet and the existing 2,743‑square‑foot house currently has a 2,005‑square‑foot nonconforming upper deck built without permits, Johnson…
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