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Preservation vs. transit and housing: commission asks staff to refine partial‑preservation alternative for Potrero (Mariposa) Yard EIR
Summary
Commissioners pressed planners and SFMTA to refine a 'partial preservation' alternative for the proposed Potrero (2500 Mariposa) Yard Modernization Project EIR that balances retention of the office wing (character‑defining element) with SFMTA operational needs for bus circulation, battery‑electric readiness, and housing objectives.
Planning staff and SFMTA presented the Potrero Yard Modernization Project (2500 Mariposa St) and a draft range of preservation alternatives for the forthcoming EIR. The proposed project would replace the existing maintenance and storage facility with a new, multi‑level transit podium and residential joint development that staff estimated could accommodate about 213 bus parking spaces, 18 maintenance bays and approximately 575 housing units. Because demolition of the existing historic structure would be significant and unavoidable, staff and SFMTA presented three alternatives to be explored in the EIR: No Project (retain existing facility), Full Preservation (retain the two‑story office wing and a portion of the shops), and Partial Preservation (retain the office wing only), each with tradeoffs in bus capacity and housing production.
SFMTA project staff explained operational constraints — bus turning radii, the need to house articulated vehicles, and structural and life‑safety limitations — and said full preservation would significantly reduce achievable bus capacity and complicate internal circulation. Commissioners voiced concern that the preservation alternatives as presented looked like an exercise in comparing pre‑made numbers rather than integrating the historic form into a design that could better meet both transit and housing objectives. Multiple commissioners favored refining the Partial Preservation alternative — retaining the office wing and exploring design approaches that preserve meaningful form or urban frontage while seeking ways to reduce capacity loss (e.g., targeted setbacks, internal circulation refinements). The commission requested staff and SFMTA further refine the partial preservation approach, document why full preservation was rejected as infeasible, and revisit the alternatives when more detailed design information (including procurement/developer input) becomes available.
