Why Put Housing on a Bus Yard
The SFMTA states that Potrero Yard was built in 1915 on 4.4 acres bounded by Bryant, 17th, Hampshire and Mariposa streets. The Potrero Yard Modernization Project replaces it with a four-story bus maintenance and storage facility. The same approvals carry approximately 100 affordable homes along Bryant Street. The agency describes the plan as the nation's first known joint development of a bus maintenance facility with housing constructed adjacent to a bus facility.
That description carries the argument. One public parcel, one private partner, two public goods. The question is whether the arrangement delivers both.
The Trade the Fall 2025 Reset Made
The SFMTA published the trade in its own words. "The current scope of the project is beyond what we can afford," the agency's fall 2025 update states. The same page reads that the agency is "proposing changes that would reduce the amount of housing that could be built at the new yard", and that the approach preserves "up to 100 units of proposed affordable housing at the project site".
The housing page carries the entitlement the project holds: up to 465 residential units with up to 776 bedrooms. The bus line rises to 246 electric trolley buses, a 68 per cent increase over the current design capacity, against the 146 trolley buses the existing building holds.
Transit Capacity Carries Its Own Funding Case
The rebuilt yard stores and maintains the 5 Fulton, 5R Fulton Rapid, 14 Mission, 22 Fillmore, 30 Stockton and 49 Van Ness/Mission. The agency states those routes carry about 97,500 bus riders each weekday, more than a fifth of Muni's total weekday bus ridership. The facility houses more than 800 SFMTA staff. The agency states that state regulations require public transit agencies to reach zero-emission fleets by 2040, and that the trolley buses charged at the yard draw on the Hetch Hetchy hydroelectric dam.
The yard closed in February 2026 so crews could prepare the site, and Muni moved its buses to other divisions. That is the cost of the rebuild in service terms, and the city is paying it now.
The Strongest Objection to This Deal
Housing holds the weaker position in the structure. The project page qualifies the 100 units as "pending funding availability". The housing page places Phase 2 along Bryant Street with a start "as early as 2029", a run of approximately two years, and a dependency on housing financing. The Mayor's Office of Housing and Community Development has committed $35 million.
The objection runs like this. The label lets the city present a bus project with a housing claim attached. The parcel returns homes only if a separate financing round closes. The public land goes to the bus facility either way. The published record sets no date for the homes and ties the phase to financing that is not closed.
What the March Votes Did and Did Not Bind
The approvals are on the record. The SFMTA Board of Directors approved the project on 3 March 2026 and passed two components: the Infrastructure Facility Project Agreement for design, construction and financing, and the Lease Development and Disposition Agreement for development of affordable housing. The Board of Supervisors Budget and Finance Committee approved the package unanimously on 18 March 2026. The full Board of Supervisors approved it unanimously on 24 March 2026.
The facility agreement carries the funded scope. The disposition agreement carries the housing programme, and the unit count sits outside the money.
The Cost of Delay the Deal Does Not Price
The published timeline runs 2022 to 2026 for design and permitting, 2026 to 2030 for construction, and 2030 for the start of operations. Site preparation begins later this year, ahead of demolition expected in early 2027. Two permit filings mark the pace. The demolition application was filed on 8 September 2026 with a $4.5 million estimate and remains in filed status. The new-construction permit for the bus facility was filed on 8 November 2024 with a $400 million estimate and has never been issued.
A rebuild of a century-old yard takes a decade. Each year of delay keeps 146 buses in an obsolete building and moves the housing further from a start.
A Judgment, and Its Limits
The joint development structure suits the bus facility. The predevelopment agreement went to the Potrero Neighborhood Collective on 21 November 2022, with Plenary Americas US Holdings holding the sole equity member role, and the private partner carries design, construction and financing. The city gains a modern yard it could not fund alone. That is the strongest case for the arrangement, and the approvals support it.
The structure retains the housing option. A reader should count the project as a bus yard with a housing component, and hold the housing claim to the same standard as the bus claim.
The Test That Would Settle It
Two records would settle the question. The first is a building permit for the residential portion. The second is a closed financing round for it. Neither exists today. The next public step is a virtual construction update on Wednesday, 21 October at 5:30 p.m., with the contractor Webcor presenting.
On the published record, the deal delivers the yard and holds the homes open. That is a real gain for Muni riders and an incomplete answer for Potrero Hill.