SB 1211 for 16-unit apartment in Rancho Cucamonga
A 16-unit 16-unit apartment in Rancho Cucamonga qualifies for up to 12 new homes under SB 1211 — 8 detached ADUs and 4 interior conversions. At Rancho Cucamonga's median rent of $2,100/mo, that's ~$302K in additional gross annual rent.
The Rancho Cucamonga scenario
The scenario most Rancho Cucamonga 16-unit apartment owners face: an existing building, mature trees, and a back lot that's currently doing nothing. SB 1211's 4-ft setback and 18-ft height envelope fits 8 detached units behind that primary structure with room for fire-access in front.
Rancho Cucamonga-specific note: Inland Empire upper market.
Large multifamily (10+ unit) design playbook
A 16-unit complex is capped at 8 detached ADUs by statute, so the play shifts toward interior conversions: max(1, ⌊units × 25%⌋) = 4 additional units carved from common rooms, oversized lobbies, basement storage, or laundry rooms.
Pro-forma snapshot
| Existing units | 16 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 4 |
| Total new units | 12 |
| Median 1BR rent in Rancho Cucamonga | $2,100/mo |
| Est. additional gross rent | $302K/yr |
| Estimated total project cost | ~$2,419K |
| Year-1 NOI estimate | ~$227K |
| Stabilized cap rate at cost | 9.4% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Rancho Cucamonga | 60-100 days |
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