SB 1211 for 32-unit apartment in San Mateo
San Mateo's SB 1211 math for 32-unit apartment owners: 8 detached ADUs (the §66323 cap), plus 8 interior conversions. Total: 16 new homes. At San Mateo's median rent of $3,000/mo, that's ~$576K in additional gross annual rent.
The San Mateo scenario
Run it as a sequence: stabilize existing 32 units → permit 8 detached ADUs ministerially under §66314 → convert 8 interior spaces into rentable units → re-tenant at San Mateo medians.
San Mateo-specific note: Peninsula tech rents; very strong upside.
Large multifamily (10+ unit) design playbook
A 32-unit complex is capped at 8 detached ADUs by statute, so the play shifts toward interior conversions: max(1, ⌊units × 25%⌋) = 8 additional units carved from common rooms, oversized lobbies, basement storage, or laundry rooms.
Pro-forma snapshot
| Existing units | 32 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 8 |
| Total new units | 16 |
| Median 1BR rent in San Mateo | $3,000/mo |
| Est. additional gross rent | $576K/yr |
| Estimated total project cost | ~$3,226K |
| Year-1 NOI estimate | ~$432K |
| Stabilized cap rate at cost | 13.4% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in San Mateo | 75-130 days |
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