Board reverses CEQA exemption for 2417 Green Street after patrons and experts cite risks to adjacent historic house

The San Francisco Board of Supervisors voted unanimously on Jan. 9 to reverse a planning department determination that the proposed project at 2417 Green Street was categorically exempt from the California Environmental Quality Act (CEQA), following a lengthy public hearing and appeals process.

Appellants and numerous neighbors argued the project’s excavation and three‑story rear addition could harm the adjacent, uphill Ernest Coxhead house at 2421 Green Street — a house they and several expert witnesses described as a highly significant historic resource. Speakers cited story poles showing the addition would block dozens of windows and viewlines, alleged deep excavations that could undermine the older house’s foundations, and the site’s appearance on the city’s Maher map of potentially contaminated soil.

The appeal hearing included a 10‑minute presentation by appellant attorney Richard Drury and testimony from property owner Philip Kaufman and several technical experts, including geotechnical consultant Lawrence Karp and a hydrogeologist who warned of foundation and groundwater risks. Planning department staff told the board the department had determined the subject parcel itself was not a historic resource, that a Maher waiver had been issued by the Department of Public Health, and that the project was not unlawfully piecemealed for CEQA purposes. The project sponsor and architect disputed claims the work would materially impair the adjacent house and said they had consulted planning and held neighborhood meetings.

After hearing public comment from neighbors and preservation advocates and questions from supervisors, the board found there was substantial evidence of unusual circumstances and potential environmental effects related to historic resources and hazardous materials. Supervisor Farrell moved to table the motion to affirm the categorical exemption and instead approve motions to reverse the exemption and direct preparation of written findings; the motion passed on an 11‑0 roll call.

What the board did and what comes next: by approving items to reverse the exemption and to prepare findings, the board required the planning department to prepare formal written findings explaining why the exemption should be reversed. That step typically leads to additional environmental review; in practice it means the claim that the project required no CEQA review has been set aside and subsequent analysis and mitigation could be required before the project proceeds. The board’s action does not itself approve or deny the proposed construction; it directs further environmental consideration.

Why this mattered to neighbors: speakers said the Coxhead house’s integrity depends on its setting, access to light and air, and on foundations that, they argued, could be destabilized by nearby excavation. Several neighbors showed the board story‑pole images they said demonstrate blocking of 24 windows and loss of mid‑block open space, and argued the project’s massing exceeded Cow Hollow design guidance for the block.

Planning department staff noted that some concerns raised fall under design review and discretionary planning processes, which the project still faces; staff also flagged that permit enforcement and penalties for work beyond permitted scope are separate matters being handled outside the CEQA appeal. Several speakers and supervisors requested follow‑up work on enforcement and on strengthening penalties for work beyond the scope of permits.

The board’s reversal means the planning department must prepare and present written findings on why the categorical exemption was wrongly applied; that will be part of the administrative record and could lead to environmental review that examines foundation excavation, historic‑resource impacts and hazardous‑materials issues. The planning commission also has pending hearings connected to discretionary review of the project.