SB 1211 for 24-unit apartment in Concord
Concord's SB 1211 math for 24-unit apartment owners: 8 detached ADUs (the §66323 cap), plus 6 interior conversions. Total: 14 new homes. At Concord's median rent of $2,400/mo, that's ~$403K in additional gross annual rent.
The Concord scenario
Run it as a sequence: stabilize existing 24 units → permit 8 detached ADUs ministerially under §66314 → convert 6 interior spaces into rentable units → re-tenant at Concord medians.
Local tip for Concord: BART-adjacent demand.
Large multifamily (10+ unit) design playbook
A 24-unit complex is capped at 8 detached ADUs by statute, so the play shifts toward interior conversions: max(1, ⌊units × 25%⌋) = 6 additional units carved from common rooms, oversized lobbies, basement storage, or laundry rooms.
Pro-forma snapshot
| Existing units | 24 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 6 |
| Total new units | 14 |
| Median 1BR rent in Concord | $2,400/mo |
| Est. additional gross rent | $403K/yr |
| Estimated total project cost | ~$2,822K |
| Year-1 NOI estimate | ~$302K |
| Stabilized cap rate at cost | 10.7% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Concord | 70-115 days |
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