The Bet on the Table
The San Francisco Recovery Fund bought a stalled excavation at 50 First Street and has filed for an office tower. The application carries 1.52 million square feet of office across 56 floors. The earlier scheme on the parcel carried office and hotel space in two towers. The first tower now carries office alone, and the housing sits in a second phase.
That is a bet a reader can price. Cushman & Wakefield puts San Francisco office vacancy at 29.3 percent for the third quarter of 2026, down 410 basis points from 33.8 percent a year earlier. The same report puts the average asking rent at $72.68 per square foot on an annual gross basis, up 3.4 percent on the quarter. A building of this size enters a market with three square feet in ten standing empty and a rent that has just turned upward.
The filing publishes no preleasing, no asking rent and no named tenant. JLL holds the exclusive office leasing assignment. A reader can price the wager against the vacancy rate, the 1.52 million square feet and the floor plates the project site publishes, at up to 32,000 square feet.
Where the Housing Went
The housing sits in the second tower at 528 Mission Street: 378,720 square feet, 156 market-rate apartments and 169 guest rooms over 54 floors. The applicant states that tower keeps its 2016 entitlements and that its design does not change. The filing also proposes to improve that footprint as interim publicly accessible open space before construction, and it schedules no start for the tower.
The housing therefore sits behind a phase with no date. The open space improves the block while it waits.
The parcel's older new-construction permit, 201510301303, describes 109 residential units across 60 stories. The current filing publishes no residential programme for the first tower.
The Cost Line the Record Leaves Open
SF YIMBY reports construction at about $600 million and states that the figure is not inclusive of all development costs. No source publishes a total development cost or a cost per square foot. The purchase carries a reported $60 million from January 2026. A reader can stack those two figures and no third one.
The record states no delivery date in one place. The project site states 2030 twice, as opening and as ready for occupancy, and SF YIMBY reports delivery as early as 2031.
What Has to Hold
Four things. Tenants take 1.52 million square feet at a rent the record does not publish. Construction lending closes against a $600 million estimate that excludes some development costs. The office market keeps absorbing space at the pace of the last four quarters. The second tower gets built with its housing intact.
The fourth is the weakest. An interim open space commits the applicant to nothing, and a later owner can carry the entitlement without building it.
The Test the Next Filing Sets
A building permit for the design under review is the next dated step. Ahead of it sit a tenant and a construction loan. The record publishes neither today. A reader can hold the fund to one order of events: a signed lease before a construction loan, and a construction loan before a start on site.
Vacancy is the case against the bet. A 29.3 percent rate leaves 1.52 million square feet to lease into a market with three square feet in ten standing empty. The fund answers with a premium building on a reused foundation, a transit centre next door and a park across the street. The next filing tests that answer.