Historic Preservation Commission approves wider entry and accessibility changes at 400 California St.

The San Francisco Historic Preservation Commission on a unanimous vote approved changes to 400 California Street that will widen an interior ground-floor connection for accessibility and replace the non-historic 1967 entry doors with a new, historically sympathetic treatment. The commission voted to approve the project under Option 2 and added a finding supporting an on-site interpretive program to be incorporated as part of the Planning Department's conditional use authorization.

Staff said both options before the commission met the Secretary of the Interior's standards but recommended Option 1 because it involves the least alteration. Charles Enchell, preservation staff, described the work as removing a 1967 interior vestibule, widening the interior opening by a cumulative 8–10 inches to accommodate a ramp and egress requirements, and replacing the aluminum entry doors. Staff also requested that the sponsor develop tenant guidelines and an on-site interpretive program to explain the building's significance.

Project sponsors and the design team emphasized preservation aims and accessibility. A member of the sponsor team said the changes follow a recent voluntary seismic upgrade that tied 400 California to the adjacent 430 California tower and stressed careful stewardship: "we've had the privilege of working on 400 as a team since 02/2017" and described the seismic work as undertaken to protect both buildings. The sponsor and architect argued Option 2 would better restore the building's visual relationship to its original appearance and increase visibility into the banking hall by installing taller doors (roughly 10 feet) and a larger transom.

Commissioners asked detailed questions about interior patching where the 1967 vestibule will be removed, the relationship of the modified opening to other interior connections, and accessibility operation (automatic operators/bollards). Project representatives said they expected only minimal patching but would confirm conditions during construction, and that accessible door operation would be provided by an operator and bollard controls to meet Title 24 requirements.

Several commissioners said Option 2 better restored the building's original scale and improved public visibility into the banking hall. One commissioner said, "Option 2 gets back closer to what was originally there," while staff reiterated that bronze would be a historically appropriate material if a less-altered approach were chosen.

The commission approved Option 2, adding a finding that the Historic Preservation Commission strongly supports an on-site interpretive program; staff and sponsors said that program will be included as a condition in the Planning Commission conditional use review, scheduled to be considered before the Planning Commission on July 15. The HPC recorded the vote as unanimous.