SB 1211 for 24-unit apartment in Rancho Cucamonga
Own a 24-unit apartment in Rancho Cucamonga? SB 1211 lets you stack 14 new units on top of your existing 24: 8 detached + 6 interior. At Rancho Cucamonga's median rent of $2,100/mo, that's ~$353K in additional gross annual rent.
The Rancho Cucamonga scenario
Picture the typical case: a 24-unit 24-unit apartment on a Rancho Cucamonga block built between 1955 and 1975, with surface parking that hasn't been fully utilized in years. SB 1211 turns that parking into 8 detached units plus 6 interior conversions — 14 new doors that didn't exist before 2024.
Rancho Cucamonga-specific note: Inland Empire upper market.
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 Rancho Cucamonga | $2,100/mo |
| Est. additional gross rent | $353K/yr |
| Estimated total project cost | ~$2,822K |
| Year-1 NOI estimate | ~$265K |
| 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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