SB 1211 for 10-unit apartment in San Francisco
San Francisco's SB 1211 math for 10-unit apartment owners: 8 detached ADUs (the §66323 cap), plus 2 interior conversions. Total: 10 new homes. At San Francisco's median rent of $3,100/mo, that's ~$372K in additional gross annual rent.
The San Francisco scenario
Run it as a sequence: stabilize existing 10 units → permit 8 detached ADUs ministerially under §66314 → convert 2 interior spaces into rentable units → re-tenant at San Francisco medians.
Local tip for San Francisco: SF requires fire sprinklers in most ADU configurations.
Large multifamily (10+ unit) design playbook
A 10-unit complex is capped at 8 detached ADUs by statute, so the play shifts toward interior conversions: max(1, ⌊units × 25%⌋) = 2 additional units carved from common rooms, oversized lobbies, basement storage, or laundry rooms.
Pro-forma snapshot
| Existing units | 10 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 2 |
| Total new units | 10 |
| Median 1BR rent in San Francisco | $3,100/mo |
| Est. additional gross rent | $372K/yr |
| Estimated total project cost | ~$2,016K |
| Year-1 NOI estimate | ~$279K |
| Stabilized cap rate at cost | 13.8% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in San Francisco | 90-150 days |
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