San Francisco has spent the summer stripping the costs it can control off new housing — impact fees down two-thirds, the affordable-housing mandate cut from 15% to 5%. Yet the developers now predicting a building boom keep pointing to a lever City Hall doesn't touch: rent, which they say has to climb toward $5,000 or $6,000 a unit before the cranes come back.

Developers told the SF Standard this week that stalled projects will start to "pencil" within 12 to 24 months as rents keep rising. But read against the city's own numbers, the boom thesis carries an uncomfortable premise: the reforms San Francisco just passed aren't what unlocks construction. Tenant pain is. The city's controller has effectively conceded the point, finding that in today's market almost any affordability requirement above zero threatens whether a project gets built at all.

Developers are again forecasting a wave of construction, and this time they say they intend to get in early — breaking ground now at today's costs to capture tomorrow's rents. The number they keep circling is stark: projects only make financial sense, several told the SF Standard, once rents climb another 15% to 20%, toward $5,000 or $6,000 a unit. In other words, the "boom" they're describing is downstream of exactly the affordability crisis it's supposed to solve.

Rents are already near that threshold. A one-bedroom in San Francisco now leases for more than $4,000, up roughly a fifth from last summer. If the trend holds — and developers bet it will, as AI money keeps pulling high earners into the city — the math on projects that have sat dormant through a six-year lull starts to flip.

What separates this moment from the usual developer optimism is that City Hall has spent the year clearing the deck. In July, the Board of Supervisors voted 9-2 to cut the inclusionary-housing rate from 15% to 5% (external source, opens in a new tab), exempted projects under two dozen units entirely, and dropped the Mission from 17% to 8%. Supervisors Shamann Walton and Chyanne Chen cast the only no votes. Separately, the city cut development impact fees by roughly two-thirds (external source, opens in a new tab) — the charges meant to offset new residents' toll on roads, transit, and parks. Add Mayor Daniel Lurie's Family Zoning upzoning, and the city has surrendered nearly every cost concession within its power. Supervisor Myrna Melgar, who brokered the inclusionary deal, framed 5% as a floor to be raised later: "In three years when our economy recovers," she predicted, "the rate will go back up."

Here is the part the boosters skip past: the city's own controller says even that giveaway isn't enough. An April 2026 memorandum from Controller Greg Wagner, surfaced by Mission Local, concluded that affordability requirements meaningfully above zero "would further threaten feasibility" — meaning even the new 5% rate may be too high to pencil. It is a remarkable admission from the office charged with judging what's financially viable here, and it relocates the real lever from policy to rent.

Supervisor Myrna Melgar, who brokered the inclusionary deal, framed 5% as a floor to be raised later: "In three years when our economy recovers," she predicted, "the rate will go back up."

The pipeline the optimists cite is real but thin. Greystar has stepped in to revive the long-stalled Divisadero car wash site (external source, opens in a new tab) for 203 apartments, with an October construction start. JPMorgan placed a roughly $200 million bet on a 342-unit Dogpatch project (external source, opens in a new tab) at the Potrero Power Station — its second infusion into developer Fifth Space's redevelopment of the old power plant. And the first project cleared under Family Zoning is an eight-story condo tower planned for an Inner Richmond block across from USF (external source, opens in a new tab), which the Planning Commission approved over a neighbor's objection that eight stories "just seems kind of weird." Three headline deals do not make a boom, and none of them lowers anyone's rent.

That is the quiet consensus even the optimists share: nobody expects new towers to make housing cheaper. Absent the kind of overbuilding seen in Austin — implausible in a city that builds only upward and with union labor — the best case is that rent growth merely slows, freezing tenants at the heights they've already reached. Tenant organizers read the same forecast as a warning; every building cycle here, they note, has arrived alongside a fresh wave of speculation and displacement.

The reforms may yet get San Francisco building again. But the fine print of the boom thesis is that it runs on rent climbing past $6,000 — and the city has already agreed to ask developers for almost nothing in return.