SB 1211 for 8-unit apartment in Rancho Cucamonga
Rancho Cucamonga's SB 1211 math for 8-unit apartment owners: 8 detached ADUs (the §66323 cap), plus 2 interior conversions. Total: 10 new homes. At Rancho Cucamonga's median rent of $2,100/mo, that's ~$252K in additional gross annual rent.
The Rancho Cucamonga scenario
Run it as a sequence: stabilize existing 8 units → permit 8 detached ADUs ministerially under §66314 → convert 2 interior spaces into rentable units → re-tenant at Rancho Cucamonga medians.
Rancho Cucamonga watch: Inland Empire upper market.
Mid-size multifamily (5–8 unit) design playbook
This is SB 1211's sweet spot. A 8-unit existing building maxes out the 8-detached cap (or comes close), so design moves are about packing detached ADUs efficiently around the existing structure and converting underutilized parking.
Pro-forma snapshot
| Existing units | 8 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 2 |
| Total new units | 10 |
| Median 1BR rent in Rancho Cucamonga | $2,100/mo |
| Est. additional gross rent | $252K/yr |
| Estimated total project cost | ~$2,464K |
| Year-1 NOI estimate | ~$189K |
| Stabilized cap rate at cost | 7.7% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Rancho Cucamonga | 60-100 days |
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